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Articles 1 - 8 of 8
Full-Text Articles in Social and Behavioral Sciences
Effects Of Atmospheric Light Scattering On Spectroscopic Observations Of Greenhouse Gases From Space: Validation Of Ppdf-Based Co 2 Retrievals From Gosat, Sergey Oshchepkov, Andrey Bril, Tatsuya Yokota, Isamu Morino, Yukio Yoshida, Tsuneo Matsunaga, Dmitry Belikov, Debra Wunch, Paul Wennberg, Geoffrey Toon, Christopher O'Dell, André Butz, Sandrine Guerlet, Austin Cogan, Hartmut Boesch, Nawo Eguchi, Nicholas Deutscher, David Griffith, Ronald Macatangay, Justus Notholt, Ralf Sussmann, Markus Rettinger, Vanessa Sherlock, John Robinson, Esko Kyro, Pauli Heikkinen, Dietrich G. Feist, Tomoo Nagahama, Nikolay Kadygrov, Shamil Maksyutov, Osamu Uchino, Hiroshi Watanabe
Effects Of Atmospheric Light Scattering On Spectroscopic Observations Of Greenhouse Gases From Space: Validation Of Ppdf-Based Co 2 Retrievals From Gosat, Sergey Oshchepkov, Andrey Bril, Tatsuya Yokota, Isamu Morino, Yukio Yoshida, Tsuneo Matsunaga, Dmitry Belikov, Debra Wunch, Paul Wennberg, Geoffrey Toon, Christopher O'Dell, André Butz, Sandrine Guerlet, Austin Cogan, Hartmut Boesch, Nawo Eguchi, Nicholas Deutscher, David Griffith, Ronald Macatangay, Justus Notholt, Ralf Sussmann, Markus Rettinger, Vanessa Sherlock, John Robinson, Esko Kyro, Pauli Heikkinen, Dietrich G. Feist, Tomoo Nagahama, Nikolay Kadygrov, Shamil Maksyutov, Osamu Uchino, Hiroshi Watanabe
Faculty of Science - Papers (Archive)
This report describes a validation study of Greenhouse gases Observing Satellite (GOSAT) data processing using ground-based measurements of the Total Carbon Column Observing Network (TCCON) as reference data for column-averaged dry air mole fractions of atmospheric carbon dioxide (X CO2). We applied the photon path length probability density function method to validate X CO2 retrievals from GOSAT data obtained during 22months starting from June 2009. This method permitted direct evaluation of optical path modifications due to atmospheric light scattering that would have a negligible impact on ground-based TCCON measurements but could significantly affect gas retrievals when observing reflected sunlight from …
Atmospheric Greenhouse Gases Retrieved From Sciamachy: Comparison To Ground-Based Fts Measurements And Model Results, O Schneising, P Bergamaschi, H Bovensmann, M Buchwitz, J P. Burrows, N M. Deutscher, D W. T Griffith, J Heymann, R Macatangay, J Messerschmidt, J Notholt, M Rettinger, M Reuter, R Sussmann, Voltaire A. Velazco, T Warneke, P O. Wennberg, D Wunch
Atmospheric Greenhouse Gases Retrieved From Sciamachy: Comparison To Ground-Based Fts Measurements And Model Results, O Schneising, P Bergamaschi, H Bovensmann, M Buchwitz, J P. Burrows, N M. Deutscher, D W. T Griffith, J Heymann, R Macatangay, J Messerschmidt, J Notholt, M Rettinger, M Reuter, R Sussmann, Voltaire A. Velazco, T Warneke, P O. Wennberg, D Wunch
Faculty of Science - Papers (Archive)
SCIAMACHY onboard ENVISAT (launched in 2002) enables the retrieval of global long-term columnaveraged dry air mole fractions of the two most important anthropogenic greenhouse gases carbon dioxide and methane (denoted XCO2 and XCH4). In order to assess the quality of the greenhouse gas data obtained with the recently introduced v2 of the scientific retrieval algorithm WFM-DOAS, we present validations with ground-based Fourier Transform Spectrometer (FTS) measurements and comparisons with model results at eight Total Carbon Column Observing Network (TCCON) sites providing realistic error estimates of the satellite data. Such validation is a prerequisite to assess the suitability …
Atmospheric Carbon Dioxide Retrieved From The Greenhouse Gases Observing Satellite (Gosat): Comparison With Ground-Based Tccon Observations And Geos-Chem Model Calculations, A Cogan, H Boesch, R Parker, L Feng, Paul Palmer, J-F Blavier, Nicholas M. Deutscher, Ronald Macatangay, Justus Notholt, C M. Roehl, Thorsten Warneke, Debra Wunch
Atmospheric Carbon Dioxide Retrieved From The Greenhouse Gases Observing Satellite (Gosat): Comparison With Ground-Based Tccon Observations And Geos-Chem Model Calculations, A Cogan, H Boesch, R Parker, L Feng, Paul Palmer, J-F Blavier, Nicholas M. Deutscher, Ronald Macatangay, Justus Notholt, C M. Roehl, Thorsten Warneke, Debra Wunch
Faculty of Science - Papers (Archive)
We retrieved column-averaged dry air mole fractions of atmospheric carbon dioxide (XCO 2) from backscattered short-wave infrared (SWIR) sunlight measured by the Japanese Greenhouse gases Observing SATellite (GOSAT). Over two years of XCO 2 retrieved from GOSAT is compared with XCO 2 inferred from collocated SWIR measurements by seven ground-based Total Carbon Column Observing Network (TCCON) stations. The average difference between GOSAT and TCCON XCO 2 for individual TCCON sites ranges from -0.87 ppm to 0.77 ppm with a mean value of 0.1 ppm and standard deviation of 0.56 ppm. We find an average bias between all GOSAT and TCCON …
Methane Retrievals From Greenhouse Gases Observing Satellite (Gosat) Shortwave Infrared Measurements: Performance Comparison Of Proxy And Physics Retrieval Algorithms, D Schepers, S Guerlet, A Butz, J Landgraf, C Frankenberg, O Hasekamp, J-F Blavier, N M. Deutscher, D W. T Griffith, F Hase, E Kyro, I Morino, V Sherlock, R Sussmann, I Aben
Methane Retrievals From Greenhouse Gases Observing Satellite (Gosat) Shortwave Infrared Measurements: Performance Comparison Of Proxy And Physics Retrieval Algorithms, D Schepers, S Guerlet, A Butz, J Landgraf, C Frankenberg, O Hasekamp, J-F Blavier, N M. Deutscher, D W. T Griffith, F Hase, E Kyro, I Morino, V Sherlock, R Sussmann, I Aben
Faculty of Science - Papers (Archive)
We compare two conceptually different methods for determining methane column-averaged mixing ratios (XCH4) from Greenhouse Gases Observing Satellite (GOSAT) shortwave infrared (SWIR) measurements. These methods account differently for light scattering by aerosol and cirrus. The proxy method retrieves a CO2 column which, in conjunction with prior knowledge on CO2 acts as a proxy for scattering effects. The physics-based method accounts for scattering by retrieving three effective parameters of a scattering layer. Both retrievals are validated on a 19-month data set using ground-based XCH4 measurements at 12 stations of the Total Carbon Column Observing Network (TCCON), …
Methane Observations From The Greenhouse Gases Observing Satellite: Comparison To Ground-Based Tccon Data And Model Calculations, Robert Parker, Hartmut Boesch, Austin Cogan, Annemarie Fraser, Liang Feng, Paul Palmer, Janina Messerschmidt, Nicholas M. Deutscher, David W. Griffith, Justus Notholt, Paul O. Wennberg, Debra Wunch
Methane Observations From The Greenhouse Gases Observing Satellite: Comparison To Ground-Based Tccon Data And Model Calculations, Robert Parker, Hartmut Boesch, Austin Cogan, Annemarie Fraser, Liang Feng, Paul Palmer, Janina Messerschmidt, Nicholas M. Deutscher, David W. Griffith, Justus Notholt, Paul O. Wennberg, Debra Wunch
Faculty of Science - Papers (Archive)
We report new short-wave infrared (SWIR) column retrievals of atmospheric methane (X CH4) from the Japanese Greenhouse Gases Observing SATellite (GOSAT) and compare observed spatial and temporal variations with correlative ground-based measurements from the Total Carbon Column Observing Network (TCCON) and with the global 3-D GEOS-Chem chemistry transport model. GOSAT X CH4 retrievals are compared with daily TCCON observations at six sites between April 2009 and July 2010 (Bialystok, Park Falls, Lamont, Orleans, Darwin and Wollongong). GOSAT reproduces the site-dependent seasonal cycles as observed by TCCON with correlations typically between 0.5 and 0.7 with an estimated single-sounding precision between 0.4-0.8%. …
Autonomous Greenhouse Gas Measurement System For Analysis Of Gas Migration On Landfill Sites, Stephen Beirne, Breda M. Kierman, Cormac Fay, Colum Foley, Brian Corcoran, Alan F. Smeaton, Dermot Diamond
Autonomous Greenhouse Gas Measurement System For Analysis Of Gas Migration On Landfill Sites, Stephen Beirne, Breda M. Kierman, Cormac Fay, Colum Foley, Brian Corcoran, Alan F. Smeaton, Dermot Diamond
Faculty of Science - Papers (Archive)
This paper describes the design, development and validation of an autonomous gas sensing platform prototype for monitoring of the greenhouse gases, methane (CH4) and carbon dioxide (CO2). The deployment undertaken for validation of the developed prototype monitored landfill gas migration to perimeter borehole wells on a landfill site. Target gas concentrations were captured via infrared gas sensors tuned for each target gas and data reported to an offsite data collection point at 12 hour intervals. This bespoke platform and the accompanying data recording and interface software provide a flexible alternative to the presently employed labor intensive, …
Trend Analysis Of Greenhouse Gases Over Europe Measured By A Network Of Ground-Based Remote Ftir Instruments, T Gardiner, A Forbes, M De Maziere, C Vigouroux, E Mahieu, P Demoulin, Voltaire A. Velazco, J Notholt, T Blumenstock, F Hase, I Kramer, R Sussmann, W Stremme, J Mellqvist, A Strandberg, K Ellingsen, M Gauss
Trend Analysis Of Greenhouse Gases Over Europe Measured By A Network Of Ground-Based Remote Ftir Instruments, T Gardiner, A Forbes, M De Maziere, C Vigouroux, E Mahieu, P Demoulin, Voltaire A. Velazco, J Notholt, T Blumenstock, F Hase, I Kramer, R Sussmann, W Stremme, J Mellqvist, A Strandberg, K Ellingsen, M Gauss
Faculty of Science - Papers (Archive)
This paper describes the statistical analysis of annual trends in long term datasets of greenhouse gas measurements taken over ten or more years. The analysis technique employs a bootstrap resampling method to determine both the long-term and intra-annual variability of the datasets, together with the uncertainties on the trend values.
Sea-Level Variability And Its Impact Within The Greenhouse Scenario, Edward A. Bryant
Sea-Level Variability And Its Impact Within The Greenhouse Scenario, Edward A. Bryant
Faculty of Science - Papers (Archive)
The greenhouse scenario assumes that sea level will rise worldwide at uniform rates because of near-polar ice melting or because of thermal expansion of ocean waters. This view ignores the natural variability of existing sea-level behaviour that occurs globally over time. It also ignores the fact that some of this variability is related to changes in climatic parameters such as precipitation, barometric pressure and temperature that will be influenced by the greenhouse effect. This paper presents existing evidence on sea-level variability across the globe and links it to changes in atmospheric pressure, air temperature and precipitation for the period 1933-1980. …