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Articles 1 - 13 of 13
Full-Text Articles in Social and Behavioral Sciences
Total Carbon Column Observing Network Philippines: Toward Quantifying Atmospheric Carbon In Southeast Asia, Voltaire A. Velazco, Isamu Morino, Osamu Uchino, Nicholas M. Deutscher, Beata Bukosa, Dmitry A. Belikov, Yu Oishi, Takashi Y. Nakajima, Ronald Macatangay, Takahiro Nakatsuru, David W. T Griffith
Total Carbon Column Observing Network Philippines: Toward Quantifying Atmospheric Carbon In Southeast Asia, Voltaire A. Velazco, Isamu Morino, Osamu Uchino, Nicholas M. Deutscher, Beata Bukosa, Dmitry A. Belikov, Yu Oishi, Takashi Y. Nakajima, Ronald Macatangay, Takahiro Nakatsuru, David W. T Griffith
Faculty of Science, Medicine and Health - Papers: part A
TCCON (Total Carbon Column Observing Network) is dedicated to the precise measurements of greenhouse gases such as CO2 and CH4. TCCON measurements are used extensively for satellite validation, for atmospheric chemistry modeling, and for carbon cycle studies. With the global effort to cap greenhouse gas emissions, TCCON has taken on a vital role in validating past, current, and future satellite missions such as Japan's Greenhouse Gases Observing Satellite (GOSAT & GOSAT-2), National Aeronautics and Space Administration's (NASA) Orbiting Carbon Observatory-2 (OCO-2 & future OCO-3), and others. However, the lack of reliable validation data for satellite-based greenhouse gas observations in the …
Comparisons Of The Orbiting Carbon Observatory-2 (Oco-2) XCo2 Measurements With Tccon, Debra Wunch, Paul O. Wennberg, Greg Osterman, B Fisher, Bret Naylor, Coleen M. Roehl, Christopher O'Dell, L Mandrake, C Viatte, Matthaus Kiel, David W. T Griffith, Nicholas M. Deutscher, Voltaire A. Velazco
Comparisons Of The Orbiting Carbon Observatory-2 (Oco-2) XCo2 Measurements With Tccon, Debra Wunch, Paul O. Wennberg, Greg Osterman, B Fisher, Bret Naylor, Coleen M. Roehl, Christopher O'Dell, L Mandrake, C Viatte, Matthaus Kiel, David W. T Griffith, Nicholas M. Deutscher, Voltaire A. Velazco
Faculty of Science, Medicine and Health - Papers: part A
NASA's Orbiting Carbon Observatory-2 (OCO-2) has been measuring carbon dioxide column-averaged dry-air mole fraction, XCO2, in the Earth's atmosphere for over 2 years. In this paper, we describe the comparisons between the first major release of the OCO-2 retrieval algorithm (B7r) and XCO2 from OCO-2's primary ground-based validation network: the Total Carbon Column Observing Network (TCCON). The OCO-2 XCO2 retrievals, after filtering and bias correction, agree well when aggregated around and coincident with TCCON data in nadir, glint, and target observation modes, with absolute median differences less than 0.4 ppm and RMS differences less than 1.5 …
Impacts Of Frequent Burning On Live Tree Carbon Biomass And Demography In Post-Harvest Regrowth Forest, Luke Collins, Trent Penman, Fabiano De Aquino Ximenes, Doug Binns, Alan York, Ross Bradstock
Impacts Of Frequent Burning On Live Tree Carbon Biomass And Demography In Post-Harvest Regrowth Forest, Luke Collins, Trent Penman, Fabiano De Aquino Ximenes, Doug Binns, Alan York, Ross Bradstock
Faculty of Science, Medicine and Health - Papers: part A
The management of forest ecosystems to increase carbon storage is a global concern. Fire frequency has the potential to shift considerably in the future. These shifts may alter demographic processes and growth of tree species, and consequently carbon storage in forests. Examination of the sensitivity of forest carbon to the potential upper and lower extremes of fire frequency will provide crucial insight into the magnitude of possible change in carbon stocks associated with shifts in fire frequency. This study examines how tree biomass and demography of a eucalypt forest regenerating after harvest is affected by two experimentally manipulated extremes in …
Carbon Dioxide Rebreathing In Respiratory Protective Devices: Influence Of Speech And Work Rate In Full-Face Masks, Carmen L. Smith, Jane L. Whitelaw, Brian Davies
Carbon Dioxide Rebreathing In Respiratory Protective Devices: Influence Of Speech And Work Rate In Full-Face Masks, Carmen L. Smith, Jane L. Whitelaw, Brian Davies
Faculty of Science, Medicine and Health - Papers: part A
Carbon dioxide (CO2) rebreathing has been recognised as a concern regarding respirator use and is related to symptoms of discomfort, fatigue, dizziness, headache, muscular weakness and drowsiness. Previous investigations are limited by small sample size and have not evaluated the relationship between CO2 inhalation and phonic respiration (breathing during speech) in respiratory protective devices (RPDs). A total of 40 workers trained in the use of RPDs performed a graded exercise test on a cycle ergonometer that increased in workload every 5 min. During the third minute of each stage, participants read aloud a prepared text. Measures of mixed expired CO2 …
Allochthonous And Autochthonous Contributions To Carbon Accumulation And Carbon Store In Southeastern Australian Coastal Wetlands, N Saintilan, K Rogers, D Mazumder, C Woodroffe
Allochthonous And Autochthonous Contributions To Carbon Accumulation And Carbon Store In Southeastern Australian Coastal Wetlands, N Saintilan, K Rogers, D Mazumder, C Woodroffe
Faculty of Science, Medicine and Health - Papers: part A
Estimates of carbon store and carbon accumulation rate in mangrove and saltmarsh are beset by issues of scale and provenance. Estimates at a site do not allow scaling to regional estimates if the drivers of variability are not known. Also, carbon accumulation within soils provides a net offset only if carbon is derived in-situ, or would not otherwise be sequestered. We use a network of observation sites extending across 2000 km of southeastern Australian coastline to determine the influence of geomorphic setting and coastal wetland vegetation type on rates of carbon accumulation, carbon store and probable sources. Carbon accumulation above …
Forest Fire Management, Climate Change, And The Risk Of Catastrophic Carbon Losses, David M. J. S Bowman, Brett P. Murphy, Mathias M. Boer, Ross A. Bradstock, Geoffrey J. Cary, Mark A. Cochrane, Rodderick J. Fensham, Meg A. Krawchuk, Owen F. Price, Richard J. Williams
Forest Fire Management, Climate Change, And The Risk Of Catastrophic Carbon Losses, David M. J. S Bowman, Brett P. Murphy, Mathias M. Boer, Ross A. Bradstock, Geoffrey J. Cary, Mark A. Cochrane, Rodderick J. Fensham, Meg A. Krawchuk, Owen F. Price, Richard J. Williams
Faculty of Science, Medicine and Health - Papers: part A
Approaches to management of fireprone forests are undergoing rapid change, driven by recognition that technological attempts to subdue fire at large scales (fire suppression) are ecologically and economically unsustainable. However, our current framework for intervention excludes the full scope of the fire management problem within the broader context of fire−vegetation−climate interactions. Climate change may already be causing unprecedented fire activity, and even if current fires are within the historical range of variability, models predict that current fire management problems will be compounded by more frequent extreme fire-conducive weather conditions (eg Fried et al. 2004).
Conducting Carbon Nanofibre Networks: Dispersion Optimisation, Evaporative Casting And Direct Writing, Holly Warren, Reece D. Gately, Hayley N. Moffat, Marc In Het Panhuis
Conducting Carbon Nanofibre Networks: Dispersion Optimisation, Evaporative Casting And Direct Writing, Holly Warren, Reece D. Gately, Hayley N. Moffat, Marc In Het Panhuis
Faculty of Science, Medicine and Health - Papers: part A
The optimisation of vapour-grown carbon nanofibres (VGCNFs) dispersed in the biopolymer gellan gum (GG) and its usage as an ink for the direct writing of conducting networks are reported. Sonication optimisation showed that dispersing 10 mg per mL VGCNFs required 3 mg per mL GG solution and 4 minutes of low energy probe sonication. Free-standing films prepared by evaporative casting were found to exhibit electrical conductivity values of up to 35 ± 2 S cm-1. It is demonstrated that sonolysis has a detrimental effect on electrical conductivity. The dispersions were easily modified to allow for direct writing of conducting networks …
Bacterial Filtration Using Carbon Nanotube/Antibiotic Buckypaper Membranes, Luke J. Sweetman, Leighton J. Alcock, Jason D. Mcarthur, Elise M. Stewart, Gerry Triani, Marc In Het Panhuis, Stephen F. Ralph
Bacterial Filtration Using Carbon Nanotube/Antibiotic Buckypaper Membranes, Luke J. Sweetman, Leighton J. Alcock, Jason D. Mcarthur, Elise M. Stewart, Gerry Triani, Marc In Het Panhuis, Stephen F. Ralph
Faculty of Science, Medicine and Health - Papers: part A
The preparation of free-standing carbon nanotube “buckypaper” (BP) membranes consisting of either single-walled carbon nanotubes (SWNTs) or multi-walled carbon nanotubes (MWNTs), and the antibiotic ciprofloxacin (cipro), is reported. The electrical, mechanical and morphological properties of these membranes have been characterised and are compared to those of the corresponding buckypaper membranes containing the surfactant Triton X-100 (Trix). Analysis of scanning electron microscopic images of the surfaces of SWNT/cipro and SWNT/Trix (Trix = Triton X-100) buckypapers revealed that the diameter of their surface pores was significantly smaller than that of the corresponding materials prepared using MWNTs. Similarly, the average internal pore diameter …
First Intercalibration Of Column-Averaged Methane From The Total Carbon Column Observing Network And The Network For The Detection Of Atmospheric Composition Change, R Sussmann, A Ostler, F Forster, M Rettinger, N M. Deutscher, D W. T Griffith, J W. Hannigan, N Jones, P K. Patra
First Intercalibration Of Column-Averaged Methane From The Total Carbon Column Observing Network And The Network For The Detection Of Atmospheric Composition Change, R Sussmann, A Ostler, F Forster, M Rettinger, N M. Deutscher, D W. T Griffith, J W. Hannigan, N Jones, P K. Patra
Faculty of Science, Medicine and Health - Papers: part A
We present the first intercalibration of dry-air column-averaged mole fractions of methane (XCH4) retrieved from solar Fourier transform infrared (FTIR) measurements of the Network for the Detection of Atmospheric Composition Change (NDACC) in the mid-infrared (MIR) versus near-infrared (NIR) soundings from the Total Carbon Column Observing Network (TCCON). The study uses multi-annual quasi-coincident MIR and NIR measurements from the stations Garmisch, Germany (47.48° N, 11.06° E, 743 m a.s.l.), and Wollongong, Australia (34.41° S, 150.88° E, 30 m a.s.l.). Direct comparison of the retrieved MIR and NIR XCH4 time series for Garmisch shows a quasi-periodic seasonal bias leading to a …
Does Addition Of No2 To Carbon-Centered Radicals Yield Rono Or Rno2? An Investigation Using Distonic Radical Ions, Benjamin B. Kirk, Adam J. Trevitt, Stephen J. Blanksby
Does Addition Of No2 To Carbon-Centered Radicals Yield Rono Or Rno2? An Investigation Using Distonic Radical Ions, Benjamin B. Kirk, Adam J. Trevitt, Stephen J. Blanksby
Faculty of Science, Medicine and Health - Papers: part A
Nitrogen dioxide is used as a "radical scavenger" to probe the position of carbon-centered radicals within complex radical ions in the gas phase. As with analogous neutral radical reactions, this addition results in formation of an [M + NO2](+) adduct, but the structural identity of this species remains ambiguous. Specifically, the question remains: do such adducts have a nitro-(RNO2) or nitrosoxy-(RONO) moiety, or are both isomers present in the adduct population? In order to elucidate the products of such reactions, we have prepared and isolated three distonic phenyl radical cations and observed their reactions with nitrogen dioxide in the gas …
The Significance Of Carbon-Enriched Dust For Global Carbon Accounting, Nicholas P. Webb, Adrian Chappell, Craig L. Strong, Samuel K. Marx, Granth Mctainsh
The Significance Of Carbon-Enriched Dust For Global Carbon Accounting, Nicholas P. Webb, Adrian Chappell, Craig L. Strong, Samuel K. Marx, Granth Mctainsh
Faculty of Science, Medicine and Health - Papers: part A
Soil carbon stores amount to 54% of the terrestrial carbon pool and twice the atmospheric carbon pool, but soil organic carbon (SOC) can be transient. There is an ongoing debate about whether soils are a net source or sink of carbon, and understanding the role of aeolian processes in SOC erosion, transport and deposition is rudimentary. The impacts of SOC erosion by wind on the global carbon budget, and its importance for carbon accounting remain largely unknown. Current understanding of SOC losses to wind erosion is based on the assumption that the SOC content of eroded material is the same …
Fire Regimes And Carbon In Australian Vegetation, Richard J. Williams, Ross A. Bradstock, Damian Barrett, Jason Beringer, Mathias M. Boer, Geoffrey J. Cary, Garry D. Cook, A Malcolm Gill, Lindsay B. Hutley, Heather Keith, Stefan W. Maier, Cp (Mick) Meyer, Owen Price, Stephen H. Roxburgh, Jeremy Russell-Smith
Fire Regimes And Carbon In Australian Vegetation, Richard J. Williams, Ross A. Bradstock, Damian Barrett, Jason Beringer, Mathias M. Boer, Geoffrey J. Cary, Garry D. Cook, A Malcolm Gill, Lindsay B. Hutley, Heather Keith, Stefan W. Maier, Cp (Mick) Meyer, Owen Price, Stephen H. Roxburgh, Jeremy Russell-Smith
Faculty of Science, Medicine and Health - Papers: part A
Fires regularly affect many of the world's terrestrial ecosystems, and, as a result, fires mediate the exchange of greenhouse gases (GHG) between the land and the atmosphere at a global scale and affect the capacity of terrestrial ecosystems to store carbon (Bowman et al. 2009). Variations in fire -regimes can therefore potentially affect the global, regional and local carbon balance and, potentially, climate change itself (Bonan 2008). Here we examine how variation in fire regimes (Gill 1975; Bradstock et al. 2002) will potentially affect carbon in fire-prone Australian ecosystems via interactions with the stocks and transfers of carbon that are …
Correlation Of Aerosol And Carbon Monoxide At 45 S: Evidence Of Biomass Burning Emissions, Nicholas Jones, Curtis P. Rinsland, J Ben Liley, Jim Rosen
Correlation Of Aerosol And Carbon Monoxide At 45 S: Evidence Of Biomass Burning Emissions, Nicholas Jones, Curtis P. Rinsland, J Ben Liley, Jim Rosen
Faculty of Science, Medicine and Health - Papers: part A
Altitude profiles of Carbon Monoxide (CO) and aerosols have been compared from the Network for Stratospheric Change (NDSC) mid-latitude southern hemisphere site at Lauder, New Zealand. The CO mixing ratio profile was derived from infrared spectra recorded with a very high resolution Fourier Transform interferometer using three lines of the (1–0) band between 2057 and 2160 cm−1. The aerosol surface area was derived from balloon-borne backscatter radiation at 940 nm. Both datasets show significant enhancements occurring over the observation site in the austral spring. When displayed together their combined effect illustrates the close correlation between CO and aerosols. …