Global Concentrations of CO2 and CH4 Retrieved from GOSAT: First Preliminary Results
Global Concentrations of CO2 and CH4 Retrieved from GOSAT: First Preliminary Results
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DOI：
10.2151/sola.2009-041
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发表时间：
2009
期刊：
影响因子：
1.9
通讯作者：
T. Yokota;Y. Yoshida;N. Eguchi;Y. Ota;Tomoak Tanaka;H. Watanabe;Shamil Maksyutov
中科院分区：
文献类型：
--
作者：
T. Yokota;Y. Yoshida;N. Eguchi;Y. Ota;Tomoak Tanaka;H. Watanabe;Shamil Maksyutov
温室气体观测卫星 (GOSAT) 于 2009 年 1 月 23 日发射，旨在从太空监测全球大气中二氧化碳和甲烷的水平。在初步卫星系统检查后，GOSAT 开始对其仪器进行初步操作。尽管GOSAT仪器获得的辐射数据目前处于校准和验证的初步阶段，但CO2和CH4的光谱吸收特征是清晰可辨的。对这些气体浓度的初步检索是针对陆地上无云条件的测量场景进行的。这些结果表明，北半球二氧化碳和甲烷的柱平均干燥空气摩尔分数均高于南半球。这些纬度差异与从地面来源和其他卫星观测获得的数据一致；然而，GOSAT 数据中的气体浓度绝对值似乎被低估了。应进行校准和验证以提高 GOSAT 检索的质量。
The Greenhouse Gases Observing Satellite (GOSAT) was launched on January 23, 2009, to monitor global atmospheric levels of CO2 and CH4 from space. GOSAT started initial operation of its instruments after an initial satellite system check. Although the radiant data obtained by the GOSAT instruments are currently in the preliminary stages of calibration and validation, the spectral absorption features of CO2 and CH4 are clearly identifiable. An initial retrieval of these gaseous concentrations was performed for measurement scenes of cloud-free conditions over land. These results showed that column-averaged dry air mole fractions of both CO2 and CH4 in the northern hemisphere were higher than those in the southern hemisphere. These latitudinal differences agree with data obtained from ground-based sources and other satellite observations; however, the absolute values of the gaseous concentrations from GOSAT data seem to have been underestimated. Calibrations as well as validation should be conducted to improve the quality of GOSAT retrievals.