Effects of atmospheric light scattering on spectroscopic observations of greenhouse gases from space: Validation of PPDF-based CO2 retrievals from GOSAT

被引：41

作者：

Oshchepkov, Sergey ^{[1
]}

Bril, Andrey ^{[1
]}

Yokota, Tatsuya ^{[1
]}

Morino, Isamu ^{[1
]}

Yoshida, Yukio ^{[1
]}

Matsunaga, Tsuneo ^{[1
]}

Belikov, Dmitry ^{[1
]}

Wunch, Debra ^{[2
]}

Wennberg, Paul ^{[2
]}

Toon, Geoffrey ^{[3
]}

O'Dell, Christopher ^{[4
]}

Butz, Andre ^{[5
]}

Guerlet, Sandrine ^{[6
]}

Cogan, Austin ^{[7
]}

Boesch, Hartmut ^{[7
]}

Eguchi, Nawo ^{[8
]}

Deutscher, Nicholas ^{[9
,10
,11
]}

Griffith, David ^{[9
,10
]}

Macatangay, Ronald ^{[9
,10
]}

Notholt, Justus ^{[11
]}

Sussmann, Ralf ^{[12
]}

Rettinger, Markus ^{[12
]}

Sherlock, Vanessa ^{[13
]}

Robinson, John ^{[13
]}

Kyro, Esko ^{[14
]}

Heikkinen, Pauli ^{[14
]}

Feist, Dietrich G. ^{[15
]}

Nagahama, Tomoo ^{[16
]}

Kadygrov, Nikolay ^{[17
]}

Maksyutov, Shamil ^{[1
]}

Uchino, Osamu ^{[1
]}

Watanabe, Hiroshi ^{[1
]}

机构：

[1] Natl Inst Environm Studies, Tsukuba, Ibaraki 3058506, Japan

[2] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA

[3] CALTECH, Jet Prop Lab, Pasadena, CA USA

[4] Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 USA

[5] Karlsruhe Inst Technol, IMK ASF, Karlsruhe, Germany

[6] SRON Netherlands Inst Space Res, Utrecht, Netherlands

[7] Univ Leicester, Space Res Ctr, Leicester, Leics, England

[8] Kyushu Univ, Appl Mech Res Inst, Kyushu, Japan

[9] Univ Wollongong, Sch Chem, Wollongong, NSW, Australia

[10] Univ Wollongong, Ctr Atmospher Chem, Wollongong, NSW, Australia

[11] Univ Bremen, Inst Environm Phys, D-28359 Bremen, Germany

[12] Karlsruhe Inst Technol, IMK IFU, Garmisch Partenkirchen, Germany

[13] Natl Inst Water & Atmospher Res, Wellington, New Zealand

[14] FMI Arctic Res Ctr, Sodankyla, Finland

[15] Max Planck Inst Biogeochem, Jena, Germany

[16] Nagoya Univ, Solar Terr Environm Lab, Nagoya, Aichi 4648601, Japan

[17] IPSL, Lab Sci Climat & Environm, CEA, CNRS,UVSQ, Gif Sur Yvette, France

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES | 2012年 / 117卷

基金：

澳大利亚研究理事会;

关键词：

FOURIER-TRANSFORM SPECTROMETER; CARBON-DIOXIDE; DIFFERENTIAL ABSORPTION; OBSERVING SATELLITE; REFLECTED SUNLIGHT; COLUMN; AEROSOL; CH4; ALGORITHM; MODEL;

D O I：

10.1029/2012JD017505

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

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 22 months 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 space. Our results reveal effects of optical path lengthening over Northern Hemispheric stations, essentially from May-September of each year, and of optical path shortening for sun-glint observations in tropical regions. These effects are supported by seasonal trends in aerosol optical depth derived from an offline three-dimensional aerosol transport model and by cirrus optical depth derived from space-based measurements of the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) instrument. Removal of observations that were highly contaminated by aerosol and cloud from the GOSAT data set resulted in acceptable agreement in the seasonal variability of X-CO2 over each station as compared with TCCON measurements. Statistical comparisons between GOSAT and TCCON coincident measurements of CO2 column abundance show a correlation coefficient of 0.85, standard deviation of 1.80 ppm, and a sub-ppm negative bias of -0.43 ppm for all TCCON stations. Global distributions of monthly mean retrieved X-CO2 with a spatial resolution of 2.5 degrees latitude x 2.5 degrees longitude show agreement within similar to 2.5 ppm with those predicted by the atmospheric tracer transport model.

引用

页数：18

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