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Articles 1 - 27 of 27
Full-Text Articles in Social and Behavioral Sciences
Appraisal Of A One-Dimensional Model, Field Data And Dimensionless Parameters In A Study Of Estuarine Circulation, Errol J. Mclean, J. B. Hinwood
Appraisal Of A One-Dimensional Model, Field Data And Dimensionless Parameters In A Study Of Estuarine Circulation, Errol J. Mclean, J. B. Hinwood
Faculty of Science - Papers (Archive)
Parallel research programs encompassing the hydrodynamics and geochemistry have been undertaken in Oatley Bay, a small urban estuary that is a lower tributary to the Georges River in Southern Sydney Using field data and a simple numerical model, the regimes of flow effecting circulation in Oatley Bay have been determined. The efficiency of flushing and the subsequent fate of conservative pollutants are discussed. The field data comprised bathymetry, tides, drogue tracking and dye tests, the latter enabling the calibration of the model under different environmental conditions. With this model we have performed numerous runs and have characterised temporal and spatial …
Validation And Data Characteristics Of Methane And Nitrous Oxide Profiles Observed By Mipas And Processed With Version 4.61 Algorithm, S Payan, C Camy-Peyret, H Oelhaf, G Wetzel, G Maucher, Nicholas B. Jones, S Wood, M De Maziere, T Blumenstock, P Duchatelet, D Smale, G Bianchini, G Redaelli, F Mencaraglia, M Pirre, N Huret, C Piccolo, U Cortesi, C Keim, N Glatthor, S Mikuteit, G P. Stiller, C Vigouroux, A Engel, M C. Volk, J Kuttippurath, H Kuellmann, P Raspollini, M Mahieu, V Payne, A Bracher, K Grunow, P Jeseck, Y Te, K Pfeilsticker, A Butz, Justus Notholt, Voltaire A. Velazco
Validation And Data Characteristics Of Methane And Nitrous Oxide Profiles Observed By Mipas And Processed With Version 4.61 Algorithm, S Payan, C Camy-Peyret, H Oelhaf, G Wetzel, G Maucher, Nicholas B. Jones, S Wood, M De Maziere, T Blumenstock, P Duchatelet, D Smale, G Bianchini, G Redaelli, F Mencaraglia, M Pirre, N Huret, C Piccolo, U Cortesi, C Keim, N Glatthor, S Mikuteit, G P. Stiller, C Vigouroux, A Engel, M C. Volk, J Kuttippurath, H Kuellmann, P Raspollini, M Mahieu, V Payne, A Bracher, K Grunow, P Jeseck, Y Te, K Pfeilsticker, A Butz, Justus Notholt, Voltaire A. Velazco
Faculty of Science - Papers (Archive)
The ENVISAT validation programme for the atmospheric instruments MIPAS, SCIAMACHY and GOMOS is based on a number of balloon-bone, aircraft and ground-based correlative measurements. In particular the activities of validation scientists were coordinated by ESA within the ENVISAT Stratospheric Aircraft and Balloon Campaign of ESABC. As part of a series of similar papers on other species [this issue] and in parallel to the contribution of the individual validation teams, the present paper provides a synthesis of comparisons performed between MIPAS CH4 and N2O profiles produced by the current ESA operational software (Instrument Processing Facility version 4.61 or IPF v4.61) and …
Validation Of Mipas Hno3 Operational Data, D Y. Wang, M Hopfner, C E. Blom, W E. Ward, Nicholas B. Jones, G C. Toon, E Mahieu, S Wood, M De Maziere, P Demoulin, T Blumenstock, F Hase, H W. Fischer, D Smale, G Bianchini, G Redaelli, F Mencaraglia, J Urban, D Murtagh, M Pirre, V Catoire, N Huret, H Nakajima, C Piccolo, T Sugita, A Kleinbohl, U Cortesi, C Boone, H Oelhaf, C Keim, G Y. Liu, G Wetzel, S Mikuteit, K A. Walker, P Bernath, C Vigouroux, J Kuttippurath
Validation Of Mipas Hno3 Operational Data, D Y. Wang, M Hopfner, C E. Blom, W E. Ward, Nicholas B. Jones, G C. Toon, E Mahieu, S Wood, M De Maziere, P Demoulin, T Blumenstock, F Hase, H W. Fischer, D Smale, G Bianchini, G Redaelli, F Mencaraglia, J Urban, D Murtagh, M Pirre, V Catoire, N Huret, H Nakajima, C Piccolo, T Sugita, A Kleinbohl, U Cortesi, C Boone, H Oelhaf, C Keim, G Y. Liu, G Wetzel, S Mikuteit, K A. Walker, P Bernath, C Vigouroux, J Kuttippurath
Faculty of Science - Papers (Archive)
Nitric acid (HNO3) is one of the key products that are operationally retrieved by the European Space Agency (ESA) from the emission spectra measured by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) onboard ENVISAT. The product version 4.61/4.62 for the observation period between July 2002 and March 2004 is validated by comparisons with a number of independent observations from ground-based stations, aircraft/balloon campaigns, and satellites. Individual HNO3 profiles of the ESA MIPAS level-2 product show good agreement with those of MIPAS-B and MIPAS-STR (the balloon and aircraft version of MIPAS, respectively), and the balloon-borne infrared spectrometers MkIV and SPIRALE, …
Validation Of Mipas Clono2 Measurements, M Hopfner, T Von Clarmann, Nicholas B. Jones, David W. Griffith, G C. Toon, E Mahieu, R Zander, S Wood, T Blumenstock, J Hannigan, M Coffey, F Hase, H W. Fischer, J Mellqvist, A Strandberg, Thorsten Warneke, C E. Blom, C Piesch, K W. Jucks, K Chance, W Kouker, T Reddmann, C Boone, H Oelhaf, C Keim, N Glatthor, M Kiefer, S Kellmann, R Ruhnke, A Linden, G Y. Liu, B Funke, M Milz, M Schneider, G Wetzel, T Steck, A Kleinert, S Mikuteit, G P. Stiller, U Grabowski, K A. Walker, P Bernath, F Friedl-Vallon, Justus Notholt
Validation Of Mipas Clono2 Measurements, M Hopfner, T Von Clarmann, Nicholas B. Jones, David W. Griffith, G C. Toon, E Mahieu, R Zander, S Wood, T Blumenstock, J Hannigan, M Coffey, F Hase, H W. Fischer, J Mellqvist, A Strandberg, Thorsten Warneke, C E. Blom, C Piesch, K W. Jucks, K Chance, W Kouker, T Reddmann, C Boone, H Oelhaf, C Keim, N Glatthor, M Kiefer, S Kellmann, R Ruhnke, A Linden, G Y. Liu, B Funke, M Milz, M Schneider, G Wetzel, T Steck, A Kleinert, S Mikuteit, G P. Stiller, U Grabowski, K A. Walker, P Bernath, F Friedl-Vallon, Justus Notholt
Faculty of Science - Papers (Archive)
Altitude profiles of ClONO2 retrieved with the IMK (Institut fur Meteorologie und Klimaforschung) science-oriented data processor from MIPAS/Envisat (Michelson Interferometer for Passive Atmospheric Sounding on Envisat) mid-infrared limb emission measurements between July 2002 and March 2004 have been validated by comparison with balloon-borne (Mark IV, FIRS2, MIPASB), airborne (MIPAS-STR), ground-based (Spitsbergen, Thule, Kiruna, Harestua, Jungfraujoch, Izana, Wollongong, Lauder), and spaceborne (ACE-FTS) observations. With few exceptions we found very good agreement between these instruments and MIPAS with no evidence for any bias in most cases and altitude regions. For balloon-borne measurements typical absolute mean differences are below 0.05 ppbv over the …
The Global Budget Of Co, 1988-1997: Source Estimates And Validation With A Global Model, B N. Duncan, J A. Logan, I Bey, I A. Megretskaia, R M. Yantosca, P C. Novelli, Nicholas B. Jones, C P Rinsland
The Global Budget Of Co, 1988-1997: Source Estimates And Validation With A Global Model, B N. Duncan, J A. Logan, I Bey, I A. Megretskaia, R M. Yantosca, P C. Novelli, Nicholas B. Jones, C P Rinsland
Faculty of Science - Papers (Archive)
We present a model study of carbon monoxide for 1988-1997 using the GEOS-Chem 3-D model driven by assimilated meteorological data, with time-varying emissions from biomass burning and from fossil fuel and industry, overhead ozone columns, and methane. The hydroxyl radical is calculated interactively using a chemical parameterization to capture chemical feedbacks. We document the inventory for fossil fuels/industry and discuss major uncertainties and the causes of differences with other inventories that give significantly lower emissions. We find that emissions hardly change from 1988 to 1997, as increases in Asia are offset by decreases elsewhere. The model reproduces the 20% decrease …
Long-Term Tropospheric Formaldehyde Concentrations Deduced From Ground-Based Fourier Transform Solar Infrared Measurements, Nicholas B. Jones, K Riedel, Barbara M. Allen, S. W. Wood, Paul Palmer, K Chance, Justus Notholt
Long-Term Tropospheric Formaldehyde Concentrations Deduced From Ground-Based Fourier Transform Solar Infrared Measurements, Nicholas B. Jones, K Riedel, Barbara M. Allen, S. W. Wood, Paul Palmer, K Chance, Justus Notholt
Faculty of Science - Papers (Archive)
We report a 13-year (1992–2005) dataset of total column measurements of formaldehyde (HCHO) over Lauder, New Zealand, inferred from solar infrared spectra measured using a high-resolution Fourier Transform Spectrometer (FTS). Ambient HCHO concentrations at this rural location are often close to levels typical of remote marine environments (<250 ppt), which are close to the detection limit using standard techniques. Consequently we develop a new method that successfully produces HCHO columns with sufficient sensitivity throughout the whole season. HCHO columns over Lauder have a strong seasonal cycle (±50%), with a mean column of 4.9×1015 molecules cm−2, peaking during summer months. A simple box model of CH4 oxidation reproduces the observed broad-scale seasonal cycle, but significantly underestimates the seasonal peak HCHO ground concentrations during summer. This suggests the existence of an additional significant source of HCHO, possibly isoprene that cannot be explained by oxidation of CH4 alone. The ground-based FTS column data compare well with collocated HCHO column measurements from the Global Ozone Monitoring Experiment (GOME) satellite instrument during the operational period of GOME (1996–2001, r2=0.65, mean bias=10%, n=48).
The Tropical Forest And Fire Emissions Experiment: Overview And Airborne Fire Emission Factor Measurements, Robert Yokelson, Thomas Karl, P Artaxo, D Blake, Theodore Christian, David W. Griffith, A Guenther, W M Hao
The Tropical Forest And Fire Emissions Experiment: Overview And Airborne Fire Emission Factor Measurements, Robert Yokelson, Thomas Karl, P Artaxo, D Blake, Theodore Christian, David W. Griffith, A Guenther, W M Hao
Faculty of Science - Papers (Archive)
The Tropical Forest and Fire Emissions Experiment (TROFFEE) used laboratory measurements followed by airborne and ground based field campaigns during the 2004 Amazon dry season to quantify the emissions from pristine tropical forest and several plantations as well as the emissions, fuel consumption, and fire ecology of tropical deforestation fires. The airborne campaign used an Embraer 110B aircraft outfitted with whole air sampling in canisters, mass-calibrated nephelometry, ozone by UV absorbance, Fourier transform infrared spectroscopy (FTIR), and proton-transfer mass spectrometry (PTR-MS) to measure PM10, O3, CO2, CO, NO, NO2, HONO, HCN, NH3, OCS, DMS, CH4, and up to 48 non-methane …
Ground-Based Solar Absorption Ftir Spectroscopy: Characterization Of Retrievals And First Results From A Novel Optical Design Instrument At A New Ndacc Complementary Station, Aldona Waiacek, J R. Taylor, K Strong, R Saari, T Kertzenmacher, Nicholas B. Jones, David W. Griffith
Ground-Based Solar Absorption Ftir Spectroscopy: Characterization Of Retrievals And First Results From A Novel Optical Design Instrument At A New Ndacc Complementary Station, Aldona Waiacek, J R. Taylor, K Strong, R Saari, T Kertzenmacher, Nicholas B. Jones, David W. Griffith
Faculty of Science - Papers (Archive)
The authors describe the optical design of a high-resolution Fourier Transform Spectrometer (FTS), which serves as the primary instrument at the University of Toronto Atmospheric Observatory (TAO). The FTS is dedicated to ground-based infrared solar absorption atmospheric measurements from Toronto, Ontario, Canada. Instrument performance is discussed in terms of instrumental line shape (ILS) and phase error and modulation efficiency as a function of optical path difference. Typical measurement parameters are presented together with retrieval parameters used to derive total and partial column concentrations of ozone. Retrievals at TAO employ the optimal estimation method (OEM), and some impacts of the necessary …
Classification Of Seagrass Habitat Structure As A Reponse To Wave Exposure At Etoile Cay, Seychelles, Sarah Hamylton, Tom Spencer
Classification Of Seagrass Habitat Structure As A Reponse To Wave Exposure At Etoile Cay, Seychelles, Sarah Hamylton, Tom Spencer
Faculty of Science - Papers (Archive)
Physical processes are thought to be a critical control on shallow water communities in the tropics. Past studies of seagrass community patterns have tended to be qualitative and failed to empirically link observed structures with the processes that govern them. Remote sensing technology, in the form of imagery acquired using a Compact Airborne Spectrographic Imager (CASI), has been used to construct a habitat map of seagrass communities at Etoile Cay, Amirantes, Seychelles. . A sim-ple definition of seagrass habitat structure, incorporating measures of complexity and heterogene-ity, has been investigated along a wave exposure gradient via moving window analysis over the …
Interactions Between The Chloride Anion And Aromatic Molecules: Infrared Spectra Of The Cl-_C6h5ch3, Cl-_C6h5nh2 And Cl-_C6h5oh Complexes, Corinna Emmeluth, Berwyck L. J Poad, Christopher D. Thompson, Evan J. Bieske
Interactions Between The Chloride Anion And Aromatic Molecules: Infrared Spectra Of The Cl-_C6h5ch3, Cl-_C6h5nh2 And Cl-_C6h5oh Complexes, Corinna Emmeluth, Berwyck L. J Poad, Christopher D. Thompson, Evan J. Bieske
Faculty of Science - Papers (Archive)
The Cl-−C6H5CH3·Ar, Cl-−C6H5NH2·Ar, and Cl-−C6H5OH·Ar anion complexes are investigated using infrared photodissociation spectroscopy and ab initio calculations at the MP2/aug-cc-pVDZ level. The results indicate that for Cl-−C6H5NH2 and Cl-−C6H5OH, the Cl- anion is attached to the substituent group by a single near-linear hydrogen bond. For Cl-−C6H5CH3, the Cl- is attached to an ortho-hydrogen atom …
Hybrid Treatment Systems For Dye Wastewater, Faisal I. Hai, Kazuo Yamamoto, Kensuke Fukushi
Hybrid Treatment Systems For Dye Wastewater, Faisal I. Hai, Kazuo Yamamoto, Kensuke Fukushi
Faculty of Science - Papers (Archive)
Virtually all the known physico-chemical and biological techniques have been explored for treatment of extremely recalcitrant dye wastewater; none, however, has emerged as a panacea. A single universally applicable end-of-pipe solution appears to be unrealistic, and combination of appropriate techniques is deemed imperative to devise technically and economically feasible options. An in-depth evaluation of wide range of potential hybrid technologies delineated in literature along with plausible analyses of available cost information has been furnished. In addition to underscoring the indispensability of hybrid technologies, this paper also endorses the inclusion of energy and water reuse plan within the treatment scheme, and …
Late Quaternary Bedrock Incision In The Narmada River At Dardi Falls, Avijit Gupta, Vishwas S. Kale, Lewis A. Owen, A. K. Singhvi
Late Quaternary Bedrock Incision In The Narmada River At Dardi Falls, Avijit Gupta, Vishwas S. Kale, Lewis A. Owen, A. K. Singhvi
Faculty of Science - Papers (Archive)
Fluvial incision in bedrock is common in many rivers of the Indian Peninsula. We investigated a site in the gorge of the Narmada river at Dardi Falls that displays geomorphic evidence of intense bedrock erosion. We report here a terrestrial cosmogenic radionuclide date from an eroded rock surface in Peninsular India. Terrestrial cosmogenic radionuclide dating of the rock surface adjacent to the inner gorge indicated that the minimum age of the gorge is 40 ka. We suggest that the present gorge has developed in two phases, separated by a period of large-scale aggradation that filled the gorge with alluvium. Gorge …
Changes In Tropospheric Composition And Air Quality Due To Stratospheric Ozone Depletion And Climate Change, Stephen R. Wilson, Keith R. Solomon, Xiaoyan Tang
Changes In Tropospheric Composition And Air Quality Due To Stratospheric Ozone Depletion And Climate Change, Stephen R. Wilson, Keith R. Solomon, Xiaoyan Tang
Faculty of Science - Papers (Archive)
It is well-understood that reductions in air quality play a significant role in both environmental and human health. Interactions between ozone depletion and global climate change will significantly alter atmospheric chemistry which, in turn, will cause changes in concentrations of natural and human-made gasses and aerosols. Models predict that tropospheric ozone near the surface will increase globally by up to 10 to 30 ppbv (33 to 100% increase) during the period 2000 to 2100. With the increase in the amount of the stratospheric ozone, increased transport from the stratosphere to the troposphere will result in different responses in polluted and …
Why Some Alluvial Rivers Develop An Anabranching Pattern, He Qing Huang, Gerald C. Nanson
Why Some Alluvial Rivers Develop An Anabranching Pattern, He Qing Huang, Gerald C. Nanson
Faculty of Science - Papers (Archive)
Anabranching rivers have been identified globally, but a widely accepted and convincing theoretical explanation for their occurrence has remained elusive. Using basic flow and sediment transport relations, this study analyzes the mechanisms whereby self-adjusting alluvial channels can anabranch to alter their flow efficiency (sediment transport capacity per unit of stream power). It shows that without adjusting channel slope, an increase in the number of channels can produce a proportional decrease in flow efficiency, a finding particularly relevant to understanding energy consumption in some braided rivers. However, anabranching efficiency can be significantly increased by a reduction in channel width, as occurs …
~3,850 Ma Tonalites In The Nuuk Region, Greenland: Geochemistry And Their Reworking Within An Eoarchaean Gneiss Complex, Allen P. Nutman, Vickie C. Bennett, Clark R. L Friend, Kenji Horie, Hiroshi Hidaka
~3,850 Ma Tonalites In The Nuuk Region, Greenland: Geochemistry And Their Reworking Within An Eoarchaean Gneiss Complex, Allen P. Nutman, Vickie C. Bennett, Clark R. L Friend, Kenji Horie, Hiroshi Hidaka
Faculty of Science - Papers (Archive)
The Eoarchaean (>3,600 Ma) Itsaq Gneiss Complex of southern West Greenland is dominated by polyphase orthogneisses with a complex Archaean tectonothermal history. Some of the orthogneisses have c. 3,850 Ma zircons, and they vary from rare single phase metatonalites to more common complexly banded migmatites. This is due to heterogeneous strain, in situ anatexis and granitic veining superimposed during younger tectonothermal events. In the single-phase tonalites with c. 3,850 Ma zircon, oscillatory-zoned prismatic zircon is all 3,850 Ma old, but shows patchy ancient loss of radiogenic Pb. SHRIMP spot analyses and laser ablation ICP-MS depth profiling show that thin …
2635 Ma Amphibolite Facies Gold Mineralisation Near A Terrane Boundary (Suture?) On Storo, Nuuk Region, Southern West Greenland, Allen P. Nutman, Ole Christiansen, Clark R. L Friend
2635 Ma Amphibolite Facies Gold Mineralisation Near A Terrane Boundary (Suture?) On Storo, Nuuk Region, Southern West Greenland, Allen P. Nutman, Ole Christiansen, Clark R. L Friend
Faculty of Science - Papers (Archive)
Gold on Storø (in the Nuuk region of southern West Greenland) occurs in a slice of strongly deformed, amphibolite facies, Neoarchaean quartzo-feldspathic metasedimentary rocks and amphibolites in tectonic contact with the Eoarchaean Færingehavn terrane and the Meso- to Neoarchaean Akia terrane. The gold is associated with either löllingite (FeAs) + arsenopyrite or pyrrhotite, which belong with the amphibolite facies silicate mineral assemblages. Zircons were U/Pb dated by SHRIMP to constrain the timing of mineralisation. The 2700–2830 Ma oscillatory-zoned, high Th/U volcano-sedimentary zircon as whole grains and cores are interpreted to give the maximum depositional age of the rocks hosting the …
The Itsaq Gneiss Complex Of Southern West Greeland And The Construction Of Eoarchaean Crust At Convergent Plate Boundaries, Allen P. Nutman, Clark R. L Friend, Kenji Horie, Hiroshi Hidaka
The Itsaq Gneiss Complex Of Southern West Greeland And The Construction Of Eoarchaean Crust At Convergent Plate Boundaries, Allen P. Nutman, Clark R. L Friend, Kenji Horie, Hiroshi Hidaka
Faculty of Science - Papers (Archive)
The ca. 3000 km2ItsaqGneissComplex of the Nuuk region, southernWestGreenland was the first body of pre-3600 Ma crust discovered. Such ancient gneisses are now also known elsewhere, but in total form only about a millionth of the modern crust. The other 99.9999% of ancient crust was destroyed by melting and erosion over billions of years. Understanding the origin of this oldest crust is hampered by metamorphism (repeatedly) in the amphibolite or granulite facies, and most of it having been strongly deformed. The ItsaqGneissComplex is dominated by polyphase grey gneisses derived from several suites of tonalites, granites and subordinate quartz-diorites and ferro-gabbros …
Comment On "A Vestige Of Earth's Oldest Ophiolite", Allen P. Nutman, Clark R. L Friend
Comment On "A Vestige Of Earth's Oldest Ophiolite", Allen P. Nutman, Clark R. L Friend
Faculty of Science - Papers (Archive)
No abstract provided.
Structural, Metamorphic, And Geochronological Constraints On Alternating Compression And Extension In The Early Paleozoic Gondwanan Pacific Margin, Northeastern Australia, Christopher L. Fergusson, R A Henderson, I. W. Withnall, C M Fanning, D. Phillips, K. J. Lewthwaite
Structural, Metamorphic, And Geochronological Constraints On Alternating Compression And Extension In The Early Paleozoic Gondwanan Pacific Margin, Northeastern Australia, Christopher L. Fergusson, R A Henderson, I. W. Withnall, C M Fanning, D. Phillips, K. J. Lewthwaite
Faculty of Science - Papers (Archive)
The Ross-Delamerian orogenic belt formed along the early Paleozoic active Pacific margin of the newly merged Gondwana supercontinent. In its northern-most segment in the Townsville region of northeastern Australia, we have identified a short contractional phase of the Delamerian orogeny in the Argentine Metamorphics postdating formation of a mafic breccia with a U-Pb zircon age of 500 ± 4 Ma. Contraction was followed by widespread inferred extensional deformation with formation of flat-lying foliation, domal features, and amphibolite grade and greenschist retrograde metamorphism all synchronous with latest Cambrian to Early Ordovician extensional backarc volcanism, sedimentation and intrusions. One of these intrusions …
Co Measurements From The Ace-Fts Satellite Instrument: Data Analysis And Validation Using Ground-Based, Airborne And Spaceborne Observations, C Clerbaux, M George, S Turquety, K A. Walker, Nicholas B. Jones, David W. Griffith, C P Rinsland, E Mahieu, M De Maziere, A. Kagawa, J Hannigan, M Coffey, F Hase, M Hopfner, P Duchatelet, I Kramer, A Strandberg, K Strong, Y Kasai, B Barret, P Ricaud, D Murtagh, E Dupuy, V Catoire, C Robert, C Senten, N J. Livesey, M Luo, M Lopez-Puertas, Ph Medelec, A Pazmino, H Pumphrey, T Borsdorff, P F. Coheur, J P. Cammas, James Drummond, R De Zafra, M Deeter, L Emmons, F Eddounia, J C. Gille, E Le Flochmoen, C Boone, B Funke, M Schneider, G P. Stiller, P Bernath, D P. Edwards
Co Measurements From The Ace-Fts Satellite Instrument: Data Analysis And Validation Using Ground-Based, Airborne And Spaceborne Observations, C Clerbaux, M George, S Turquety, K A. Walker, Nicholas B. Jones, David W. Griffith, C P Rinsland, E Mahieu, M De Maziere, A. Kagawa, J Hannigan, M Coffey, F Hase, M Hopfner, P Duchatelet, I Kramer, A Strandberg, K Strong, Y Kasai, B Barret, P Ricaud, D Murtagh, E Dupuy, V Catoire, C Robert, C Senten, N J. Livesey, M Luo, M Lopez-Puertas, Ph Medelec, A Pazmino, H Pumphrey, T Borsdorff, P F. Coheur, J P. Cammas, James Drummond, R De Zafra, M Deeter, L Emmons, F Eddounia, J C. Gille, E Le Flochmoen, C Boone, B Funke, M Schneider, G P. Stiller, P Bernath, D P. Edwards
Faculty of Science - Papers (Archive)
The Atmospheric Chemistry Experiment (ACE) mission was launched in August 2003 to sound the atmosphere by solar occultation. Carbon monoxide (CO), a good tracer of pollution plumes and atmospheric dynamics, is one of the key species provided by the primary instrument, the ACE-Fourier Transform Spectrometer (ACE-FTS). This instrument performs measurements in both the CO 1-0 and 2-0 ro-vibrational bands, from which vertically resolved CO concentration profiles are retrieved, from the mid-troposphere to the thermosphere. This paper presents an updated description of the ACE-FTS version 2.2 CO data product, along with a comprehensive validation of these profiles using available observations (February …
Reef Development At High-Latitudes During Multiple Interglacial Cycles: New Evidence From Lord Howe Island, Southwestern Pacific, David Kennedy, Colin D. Woodroffe, J -X Zhao
Reef Development At High-Latitudes During Multiple Interglacial Cycles: New Evidence From Lord Howe Island, Southwestern Pacific, David Kennedy, Colin D. Woodroffe, J -X Zhao
Faculty of Science - Papers (Archive)
Reef development during past Interglacial periods, when sea level and sea surface temperatures were higher than today, provide unique insights into how reef systems may respond to projected human-induced global warming. Lord Howe Island currently represents the southernmost limit of reef development in the Pacific. Reef growth of Pleistocene age has been inferred to have occurred around the island, and this paper provides the fi rst detailed descriptions on the character of this development. Two phases of reef growth are identifi ed, which occurred as isolated fringing reefs along the edge of the basaltic hills of the island. Uranium-series dating …
Structural History Of The Greenvale Province, North Queensland: Early Palaeozoic Extension And Convergence On The Pacific Margin Of Gondwana, Christopher L. Fergusson, R A Henderson, I. W. Withnall, C M Fanning
Structural History Of The Greenvale Province, North Queensland: Early Palaeozoic Extension And Convergence On The Pacific Margin Of Gondwana, Christopher L. Fergusson, R A Henderson, I. W. Withnall, C M Fanning
Faculty of Science - Papers (Archive)
The southeastern Georgetown Inlier (Greenvale Province) consists of Early Palaeozoic metamorphic rocks in fault contact along the Lynd Mylonite Zone with the Palaeoproterozoic to Mesoproterozoic craton of northeastern Australia. It has a central assemblage of metamorphosed silicic volcanic and sedimentary rocks considered equivalent to the Late Cambrian to Early Ordovician Seventy Mile Range Group that developed in an extensional backarc in the Charters Towers Province to the southeast. In the western part of the Greenvale Province the Oasis Metamorphics has a U-Pb zircon SHRIMP metamorphic age of 476 ± 5 Ma and is intruded by the granodioritic Lynwater Complex with …
Detrital Zircon Ages In Neoproterozoic To Ordovician Siliciclastic Rocks, Northeastern Australia: Implications For The Tectonic History Of The East Gondwana Continental Margin, Christopher L. Fergusson, Robert A. Henderson, C Mark Fanning, Ian W. Withnall
Detrital Zircon Ages In Neoproterozoic To Ordovician Siliciclastic Rocks, Northeastern Australia: Implications For The Tectonic History Of The East Gondwana Continental Margin, Christopher L. Fergusson, Robert A. Henderson, C Mark Fanning, Ian W. Withnall
Faculty of Science - Papers (Archive)
U–Pb detrital zircon ages in variably metamorphosed, dominantly fine-grained clastic successions are used in northeastern Australia to identify two major successions along the East Gondwana margin. The older succession is of probable Late Neoproterozoic age and is considered part of a passive margin associated with rifting at c. 600 Ma. Most detrital zircons have ages in the range 1000–1300 Ma and were probably derived from an extension of a Late Mesoproterozoic (1050–1200 Ma) orogenic belt from the central Australian Musgrave Complex located 1500 km to the west. No evidence has been found for 600–800 Ma rifting of a Rodinian supercontinent …
Characteristics And Error Estimation Of Stratospheric Ozone And Ozone-Related Species Over Poker Flat (65°N, 147°W), Alaska Observed By A Ground-Based Ftir Spectrometer From 2001-2003, A. Kagawa, Y. Kasai, Nicholas Jones, M. Yamamori, K. Seki, F. Murcray, Y. Murayama, K. Mizutani, T. Itabe
Characteristics And Error Estimation Of Stratospheric Ozone And Ozone-Related Species Over Poker Flat (65°N, 147°W), Alaska Observed By A Ground-Based Ftir Spectrometer From 2001-2003, A. Kagawa, Y. Kasai, Nicholas Jones, M. Yamamori, K. Seki, F. Murcray, Y. Murayama, K. Mizutani, T. Itabe
Faculty of Science - Papers (Archive)
It is important to obtain the year-to-year trend of stratospheric minor species in the context of global changes. An important example is the trend in global ozone depletion. The purpose of this paper is to report the accuracy and precision of measurements of stratospheric chemical species that are made at our Poker Flat site in Alaska (65◦ N, 147◦ W). Since 1999, minor atmospheric molecules have been observed using a Fourier-Transform solar-absorption infrared Spectrometer (FTS) at Poker Flat. Vertical profiles of the abundances of ozone, HNO3, HCl, and HF for the period from 2001 to 2003 were retrieved from FTS …
Annual Variation Of Strato-Mesospheric Carbon Monoxide Measured By Ground-Based Fourier Transform Infrared Spectrometry, Voltaire A. Velazco, S.J. Wood, M Sinnhuber, I Kramer, Nicholas B. Jones, Y Kasai, Justus Notholt, Thorsten Warneke, T Blumenstock, F Hase, F Murcray, O Schrems
Annual Variation Of Strato-Mesospheric Carbon Monoxide Measured By Ground-Based Fourier Transform Infrared Spectrometry, Voltaire A. Velazco, S.J. Wood, M Sinnhuber, I Kramer, Nicholas B. Jones, Y Kasai, Justus Notholt, Thorsten Warneke, T Blumenstock, F Hase, F Murcray, O Schrems
Faculty of Science - Papers (Archive)
We present long-term time-series of strato-mesospheric CO vertical columns measured from stations located in Antarctica, mid-latitudes and the Arctic, covering the period from 19972005. The instrument and the measurement technique allows the separation of tropospheric and strato-mesospheric contributions to the CO column, therefore providing information on the chemistry and dynamics both at low and high altitudes. Data from polar stations show a similar annual variability of strato-mesospheric CO with a strong maximum in late winter and spring. A small enhancement in late summer for some stations, which we call the "summer bulge", can be seen occasionally. Generally, the mid-latitude stations …
Incremental Accretion Of A Sandy Reef Island Over The Past 3000 Years Indicated By Component-Specific Radiocarbon Dating, Colin D. Woodroffe, Bongkoch Samosorn, Q Hua, Deirdre E. Hart
Incremental Accretion Of A Sandy Reef Island Over The Past 3000 Years Indicated By Component-Specific Radiocarbon Dating, Colin D. Woodroffe, Bongkoch Samosorn, Q Hua, Deirdre E. Hart
Faculty of Science - Papers (Archive)
Low-lying reef islands appear particularly threatened by anticipated sea-level rise, and determining how they formed and whether they are continuing to accumulate sediment is essential for their sustainable management. Depositional chronology of Warraber Island, a small sand cay in Torres Strait, Australia, is re-examined based on AMS radiocarbon dating of specific skeletal components. Whereas radiometric dating of bulk sand samples indicated one or more discrete phases of mid-late Holocene deposition, component-specific AMS radiocarbon dating of sand grains indicates sustained incremental growth over the past 3000 years. Ages on gastropods that lived on the reef flat around the island indicate continuing …
Stratomesospheric Co Measured By A Ground-Based Fourier Transform Spectrometer Over Poker Flat, Alaska: Comparisons With Odin/Smr And A 2-D Model, Nicholas B. Jones, Y Kasai, E Dupuy, Y. Murayama, J Urban, B Barret, M Sinnhuber, A. Kagawa, T. Koshiro, P Ricaud, D Murtagh
Stratomesospheric Co Measured By A Ground-Based Fourier Transform Spectrometer Over Poker Flat, Alaska: Comparisons With Odin/Smr And A 2-D Model, Nicholas B. Jones, Y Kasai, E Dupuy, Y. Murayama, J Urban, B Barret, M Sinnhuber, A. Kagawa, T. Koshiro, P Ricaud, D Murtagh
Faculty of Science - Papers (Archive)
The interseasonal variability of stratomesospheric CO is reported from Poker Flat, Alaska, using spectra from a ground-based Fourier Transform Spectrometer (gb-FTS) for the time period from 2000 to 2004. The CO spectra were analyzed using an optimal estimation technique that separates the tropospheric and stratospheric/mesospheric components into partial columns. The distribution of CO in the polar winter is such that the gb-FTS retrieved partial column is weighted to the mesosphere. The gb-FTS data are compared with measurements of partial column CO from the Sub-Millimeter Radiometer on board the Odin satellite and shown to be in very good agreement despite the …