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Articles 1 - 9 of 9
Full-Text Articles in Physical Sciences and Mathematics
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%. …
Preliminary Validation Of Column-Averaged Volume Mixing Ratios Of Carbon Dioxide And Methane Retrieved From Gosat Short-Wavelength Infrared Spectra, David W. Griffith, G C. Toon, B Connor, R Sussmann, Thorsten Warneke, Nicholas M. Deutscher, Paul O. Wennberg, Justus Notholt, V Sherlock, J Robinson, O Uchino, C M. Roehl, I Morino, Debra Wunch, Janina Messerschmidt, Y Yoshida, M Inoue, M Rettinger
Preliminary Validation Of Column-Averaged Volume Mixing Ratios Of Carbon Dioxide And Methane Retrieved From Gosat Short-Wavelength Infrared Spectra, David W. Griffith, G C. Toon, B Connor, R Sussmann, Thorsten Warneke, Nicholas M. Deutscher, Paul O. Wennberg, Justus Notholt, V Sherlock, J Robinson, O Uchino, C M. Roehl, I Morino, Debra Wunch, Janina Messerschmidt, Y Yoshida, M Inoue, M Rettinger
Faculty of Science - Papers (Archive)
Column-averaged volume mixing ratios of carbon dioxide and methane retrieved from the Greenhouse gases Observing SATellite (GOSAT) Short-Wavelength InfraRed observation (GOSAT SWIR XCO2 and XCH4 ) were compared with the reference calibrated data obtained by ground-based high-resolution Fourier Transform Spectrometers (g-b FTSs) participating in the Total Carbon Column Observing Network (TCCON). Preliminary results are as follows: the GOSAT SWIR XCO2 and XCH4 (Version 01.xx) are biased low by 8.85 ±4.75 ppm (2.3±1.2 %) and 20.4±18.9 ppb (1.2±1.1 %), respectively. The standard deviation of the GOSAT SWIR XCO2 and XCH4 is about 1% after correcting the negative biases of XCO2 and …
The Australian Methane Budget: Interpreting Surface And Train-Borne Measurements Using A Chemistry Transport Model, A Fraser, C C. Miller, Paul Palmer, Nicholas M. Deutscher, Nicholas B. Jones, David W. Griffith
The Australian Methane Budget: Interpreting Surface And Train-Borne Measurements Using A Chemistry Transport Model, A Fraser, C C. Miller, Paul Palmer, Nicholas M. Deutscher, Nicholas B. Jones, David W. Griffith
Faculty of Science - Papers (Archive)
We investigate the Australian methane budget from 2005-2008 using the GEOS-Chem 3D chemistry transport model, focusing on the relative contribution of emissions from different sectors and the influence of long-range transport. To evaluate the model, we use in situ surface measurements of methane, methane dry air column average (XCH 4) from ground-based Fourier transform spectrometers (FTSs), and train-borne surface concentration measurements from an in situ FTS along the north-south continental transect. We use gravity anomaly data from Gravity Recovery and Climate Experiment to describe the spatial and temporal distribution of wetland emissions and scale it to a prior emission estimate, …
Train-Borne Measurements Of Tropical Methane Enhancements From Ephemeral Wetlands In Australia, Nicholas M. Deutscher, David W. T Griffith, Clare Paton-Walsh, Rittick Borah
Train-Borne Measurements Of Tropical Methane Enhancements From Ephemeral Wetlands In Australia, Nicholas M. Deutscher, David W. T Griffith, Clare Paton-Walsh, Rittick Borah
Faculty of Science - Papers (Archive)
We report greenhouse gas concentrations measured on a train covering a north-south transect through central Australia from north to south coast. During the monsoonal wet season we found significant enhancements in methane that correlate well with changing area of wetland inundation in Australian tropical savanna regions. We used a meteorological and air pollution model to quantify the ephemeral wetland fluxes necessary to cause the observed enhancements and estimate the constant Australian tropical wetland emissions. Annual Australian tropical ephemeral wetland fluxes are estimated at 0.4 +/- 0.2 Tg CH4, with permanent wetlands contributing a similar amount, 0.5 +/- 0.2 Tg CH4.
Preliminary Validation Of Column-Averaged Volume Mixing Ratios Of Carbon Dioxide And Methane Retrieved From Gosat Short-Wavelength Infrared Spectra, I Morino, O Uchino, M Inoue, Y Yoshida, T Yokota, P Wennberg, G C Toon, Debra Wunch, C M. Roehl, J Notholt, T Warneke, Janina Messerschmidt, David W. Griffith, Nicholas M. Deutscher, V Sherlock, B Connor, J Robinson, R Sussmann, M Rettinger
Preliminary Validation Of Column-Averaged Volume Mixing Ratios Of Carbon Dioxide And Methane Retrieved From Gosat Short-Wavelength Infrared Spectra, I Morino, O Uchino, M Inoue, Y Yoshida, T Yokota, P Wennberg, G C Toon, Debra Wunch, C M. Roehl, J Notholt, T Warneke, Janina Messerschmidt, David W. Griffith, Nicholas M. Deutscher, V Sherlock, B Connor, J Robinson, R Sussmann, M Rettinger
Faculty of Science - Papers (Archive)
Column-averaged volume mixing ratios of carbon dioxide and methane retrieved from the Greenhouse gases Observing SATellite (GOSAT) Short-Wavelength InfraRed observation (GOSAT SWIR XCO2 and XCH4) were compared with the reference data ob- 5 tained by ground-based high-resolution Fourier Transform Spectrometers (g-b FTSs) participating in the Total Carbon Column Observing Network (TCCON). Through calibrations of g-b FTSs with airborne in-situ measurements, the uncertainty of XCO2 and XCH4 associated with the g-b FTS was determined to be 0.8 ppm (0.2%) and 4 ppb (0.2%), respectively. The GOSAT products are validated with 10 these calibrated g-b FTS data. Preliminary results are as follows: …
Validation Of Version-4.61 Methane And Nitrous Oxide Observed By Mipas, S Payan, C Camy-Peyret, H Oelhaf, G Wetzel, G Maucher, C Keim, M Pirre, N Huret, A Engel, M C. Volk, H Kuellmann, J Kuttippurath, U Cortesi, G Bianchini, F Mencaraglia, P Raspollini, G Redaelli, C Vigouroux, M De Maziere, S Mikuteit, T Blumenstock, Voltaire A. Velazco, J Notholt, E Mahieu, P Duchatelet, D Smale, S Wood, N Jones, C Piccolo, V Payne, A Bracher, N Glatthor, G P. Stiller, K Grunow, P Jeseck, Y Te, A Butz
Validation Of Version-4.61 Methane And Nitrous Oxide Observed By Mipas, S Payan, C Camy-Peyret, H Oelhaf, G Wetzel, G Maucher, C Keim, M Pirre, N Huret, A Engel, M C. Volk, H Kuellmann, J Kuttippurath, U Cortesi, G Bianchini, F Mencaraglia, P Raspollini, G Redaelli, C Vigouroux, M De Maziere, S Mikuteit, T Blumenstock, Voltaire A. Velazco, J Notholt, E Mahieu, P Duchatelet, D Smale, S Wood, N Jones, C Piccolo, V Payne, A Bracher, N Glatthor, G P. Stiller, K Grunow, P Jeseck, Y Te, A Butz
Faculty of Science - Papers (Archive)
The ENVISAT validation programme for the atmospheric instruments MIPAS, SCIAMACHY and GOMOS is based on a number of balloon-borne, aircraft, satellite and ground-based correlative measurements. In particular the activities of validation scientists were coordinated by ESA within the ENVISAT Stratospheric Aircraft and Balloon Campaign or ESABC.
Validation Of Ace-Fts V2.2 Methane Profiles From The Upper Troposphere To Lower Mesosphere, M De Maziere, C Vigouroux, P F. Bernath, P Baron, T Blumenstock, C Boone, C Brogniez, V Catoire, M Coffey, P Duchatelet, David W. Griffith, J Hannigan, Y Kasai, I Kramer, Nicholas B. Jones, E Mahieu, G L. Manney, C Piccolo, C Randall, C Robert, C Senten, K Strong, J R. Taylor, C Tetard, K A. Walker, S Wood
Validation Of Ace-Fts V2.2 Methane Profiles From The Upper Troposphere To Lower Mesosphere, M De Maziere, C Vigouroux, P F. Bernath, P Baron, T Blumenstock, C Boone, C Brogniez, V Catoire, M Coffey, P Duchatelet, David W. Griffith, J Hannigan, Y Kasai, I Kramer, Nicholas B. Jones, E Mahieu, G L. Manney, C Piccolo, C Randall, C Robert, C Senten, K Strong, J R. Taylor, C Tetard, K A. Walker, S Wood
Faculty of Science - Papers (Archive)
The ACE-FTS (Atmospheric Chemistry Experiment Fourier Transform Spectrometer) solar occultation instrument that was launched onboard the Canadian SCISAT-1 satellite in August 2003 is measuring vertical profiles from the upper troposphere to the lower mesosphere for a large number of atmospheric constituents. Methane is one of the key species. The version v2.2 data of the ACE-FTS CH4 data have been compared to correlative satellite, balloon-borne and ground-based Fourier transform infrared remote sensing data to assess their quality. The comparison results indicate that the accuracy of the data is within 10% in the upper troposphere lower stratosphere, and within 25% in the …
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 …