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Concentration of CH4 in ambient atmosphere is quite low (～1.8 ppmv) and mixed well. So observation of CH4 variation with high precision has to rely on high-precision of inversion technique. This paper demonstrates the observation of CH4 variations using high resolution (0.02 cm-1) Fourier transform solar spectrometry, in which a high precision and large scale of retrieval algorithm is investigated. In the CH4VCD (vertical column density) retrieval, both a nonlinear least-square method and an iterative scheme are applied after the measured spectrum is modeled with various a-priori parameters. The XCH4 (column-averaged dry air mixing ratio) is calculated by using the O2 VCD derived from the 7885 cm-1 O2-A band. Fitting errors for both CH4 VCD and XCH4 are less than 1%, and most XCH4 retrievals are within the 4 variations are also investigated based on one typical daily observation. It shows that the daily CH4 VCD decreases with time and the variations of the XCH4 is within 0.02 ppmv.
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Keywords:
- Fourier transform spectroscopy /
- optical measurement techniques /
- greenhouse gas /
- methane
[1] Intergovernmental Panel on Climate Change (IPCC) 2007 Climate Change 2007: the Physical Science Basis (Geneva: IPCC Secretariat) p2
[2] Wunch D, Toon G C, Blavier J F L, Washenfelder R A, Notholt J, Connor B J, Griffith D W T, Sherlock V, Wennberg P O 2011 Physical and Engineering Sciences 369 1943
[3] Macatangay R, Warneke T, Gerbig C, Körner S, Ahmadov R, Heimann M, Notholt J 2008 Atmos. Chem. Phys. 8 2555
[4] Hartmann J M, Tran H, Toon G C 2009 Atmos. Chem. Phys. 9 7303
[5] Schneider M, Sepúlveda E, García O, Hase F, Blumenstock T 2010 Atmos. Meas. Tech. 3 1785
[6] Houweling S, Aben I, Breon F M, Chevallier F, Deutscher N M, Engelen R, Gerbig C, Griffith D W T, Hungershoefer K, Macatangay R, Marshall J, Notholt J, Peters W, Serrar S 2010 Atmos. Chem. Phys. 10 9981
[7] Geibel M C, Gerbig C, Feist D G 2010 Atmos. Chem. Phys. 3 1363
[8] Deutscher N M, Griffith D W T, Bryant G W, Wennberg P O, Toon G C, Washenfelder R A, Keppel-Aleks G, Wunch D, Yavin Y G, Allen N T, Blavier J F L, Jiménez R, Daube B C, Bright A V, Matross D M, Wofsy S C, Park S 2010 Atmos. Chem. Phys. 3 947
[9] Krijger J M, Van W M, Aben I, Frey R 2007 Atmos. Chem. Phys. 7 2881
[10] Denning A S, Randall D A, Collatz G J, Sellers P J 1996 Tellus B 48 543
[11] Wunch D, Toon G C, Wennberg P O, Wofsy S C, Stephens B, Fisher M L, Uchino O, Abshire J B, Bernath P F, Biraud S C, Blavier J F L, Boone C D, Bowman K P, Browell E V, Campos T, Connor B J, Daube B C, Deutscher N M, Diao M, Elkins J W, Gerbig C, Gottlieb E, Griffith D W T, Hurst D F, Jiménez R, Keppel-Aleks G, Kort E A, Macatangay R, Machida T, Matsueda H, Moore F L, Morino I, Park S, Robinson J, Roehl C M, Sawa Y, Sherlock V, Sweeney C, Tanaka T, Zondlo M A 2010 Atmos. Meas. Tech. 3 1351
[12] Keppel-Aleks G, Toon G C, Wennberg P O, Deutscher N M 2007 Appl. Opt. 46 4774
[13] Messerschmidt J, Macatangay R, Notholt J, Warneke T, Weinzierl C 2010 Tellus B 62 749
[14] Gloudemans A M S, Krol M C, Meirink J F, Laat A T J, Werf G R, Schrijver H, Broek M M P, Aben I 2006 Geophys. Res. Lett. 33 L16807
[15] Saitoh N, Touno M, Hayashida S, Imasu R, Shiomi K, Yokota T, Yoshida Y, Machida T, Matsueda H, Sawa Y 2012 SOLA 8 145
[16] Hamazaki T, Kaneko Y, Kuze A, Kondo K 2005 SPIE 5659 73
[17] Keppel-Aleks G, Wennberg P O, Schneider T 2011 Atmos. Chem. Phys. 11 3581
[18] Perliski L M, Solomon S 1993 J. Geophys. Res. Atmos. 98 10363
[19] Olsen S C, Randerson J T 2004 J. Geophys. Res. 109 D02301
[20] Sun Y W, Liu W Q, Xie P H, Chan K L, Zeng Y, Xu J, Li A, Si F Q, Li X X 2012 Acta Phys. Sin. 61 140705 (in Chinese) [孙友文, 刘文清, 谢品华, 陈嘉乐, 曾议, 徐晋, 李昂, 司福祺, 李先欣 2012 61 140705]
[21] Sun Y W, Liu W Q, Wang S M, Huang S H, Zeng Y, Xie P H, Chen J, Wang Y P, Si F Q 2012 Acta Phys. Sin. 61 140704 (in Chinese) [孙友文, 刘文清, 汪世美, 黄书华, 曾议, 谢品华, 陈军, 王亚萍, 司福祺 2012 61 140704]
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[1] Intergovernmental Panel on Climate Change (IPCC) 2007 Climate Change 2007: the Physical Science Basis (Geneva: IPCC Secretariat) p2
[2] Wunch D, Toon G C, Blavier J F L, Washenfelder R A, Notholt J, Connor B J, Griffith D W T, Sherlock V, Wennberg P O 2011 Physical and Engineering Sciences 369 1943
[3] Macatangay R, Warneke T, Gerbig C, Körner S, Ahmadov R, Heimann M, Notholt J 2008 Atmos. Chem. Phys. 8 2555
[4] Hartmann J M, Tran H, Toon G C 2009 Atmos. Chem. Phys. 9 7303
[5] Schneider M, Sepúlveda E, García O, Hase F, Blumenstock T 2010 Atmos. Meas. Tech. 3 1785
[6] Houweling S, Aben I, Breon F M, Chevallier F, Deutscher N M, Engelen R, Gerbig C, Griffith D W T, Hungershoefer K, Macatangay R, Marshall J, Notholt J, Peters W, Serrar S 2010 Atmos. Chem. Phys. 10 9981
[7] Geibel M C, Gerbig C, Feist D G 2010 Atmos. Chem. Phys. 3 1363
[8] Deutscher N M, Griffith D W T, Bryant G W, Wennberg P O, Toon G C, Washenfelder R A, Keppel-Aleks G, Wunch D, Yavin Y G, Allen N T, Blavier J F L, Jiménez R, Daube B C, Bright A V, Matross D M, Wofsy S C, Park S 2010 Atmos. Chem. Phys. 3 947
[9] Krijger J M, Van W M, Aben I, Frey R 2007 Atmos. Chem. Phys. 7 2881
[10] Denning A S, Randall D A, Collatz G J, Sellers P J 1996 Tellus B 48 543
[11] Wunch D, Toon G C, Wennberg P O, Wofsy S C, Stephens B, Fisher M L, Uchino O, Abshire J B, Bernath P F, Biraud S C, Blavier J F L, Boone C D, Bowman K P, Browell E V, Campos T, Connor B J, Daube B C, Deutscher N M, Diao M, Elkins J W, Gerbig C, Gottlieb E, Griffith D W T, Hurst D F, Jiménez R, Keppel-Aleks G, Kort E A, Macatangay R, Machida T, Matsueda H, Moore F L, Morino I, Park S, Robinson J, Roehl C M, Sawa Y, Sherlock V, Sweeney C, Tanaka T, Zondlo M A 2010 Atmos. Meas. Tech. 3 1351
[12] Keppel-Aleks G, Toon G C, Wennberg P O, Deutscher N M 2007 Appl. Opt. 46 4774
[13] Messerschmidt J, Macatangay R, Notholt J, Warneke T, Weinzierl C 2010 Tellus B 62 749
[14] Gloudemans A M S, Krol M C, Meirink J F, Laat A T J, Werf G R, Schrijver H, Broek M M P, Aben I 2006 Geophys. Res. Lett. 33 L16807
[15] Saitoh N, Touno M, Hayashida S, Imasu R, Shiomi K, Yokota T, Yoshida Y, Machida T, Matsueda H, Sawa Y 2012 SOLA 8 145
[16] Hamazaki T, Kaneko Y, Kuze A, Kondo K 2005 SPIE 5659 73
[17] Keppel-Aleks G, Wennberg P O, Schneider T 2011 Atmos. Chem. Phys. 11 3581
[18] Perliski L M, Solomon S 1993 J. Geophys. Res. Atmos. 98 10363
[19] Olsen S C, Randerson J T 2004 J. Geophys. Res. 109 D02301
[20] Sun Y W, Liu W Q, Xie P H, Chan K L, Zeng Y, Xu J, Li A, Si F Q, Li X X 2012 Acta Phys. Sin. 61 140705 (in Chinese) [孙友文, 刘文清, 谢品华, 陈嘉乐, 曾议, 徐晋, 李昂, 司福祺, 李先欣 2012 61 140705]
[21] Sun Y W, Liu W Q, Wang S M, Huang S H, Zeng Y, Xie P H, Chen J, Wang Y P, Si F Q 2012 Acta Phys. Sin. 61 140704 (in Chinese) [孙友文, 刘文清, 汪世美, 黄书华, 曾议, 谢品华, 陈军, 王亚萍, 司福祺 2012 61 140704]
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