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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Characterization and validation of methane products from the Atmospheric Infrared Sounder (AIRS)
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Characterization and validation of methane products from the Atmospheric Infrared Sounder (AIRS)

机译：大气红外测深仪（AIRS）甲烷产品的表征和验证

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This paper presents the characterization and validation of retrievals of atmospheric methane (CH4) vertical profiles by the Atmospheric Infrared Sounder (AIRS) on the EOS/Aqua platform. AIRS channels near 7.6 μm are used for CH4 retrieval, and they are most sensitive to the middle to upper troposphere, i.e., about 200–300 hPa in the tropics and 400–500 hPa in the polar region. The atmospheric temperature-humidity profiles, surface skin temperature, and emissivity required to derive CH4 are obtained from retrievals using separate AIRS channels and the Advanced Microwave Sounding Unit (AMSU). Comparison of AIRS retrieved profiles with some in situ aircraft CH4 profiles implied that the forward model used in the AIRS retrieval system V4.0 required a 2% increase in methane absorption coefficients for strong absorption channels, and this bias adjustment was implemented in the AIRS retrieval system V5.0. As a new operational product in V5.0, AIRS CH4 were validated using in situ aircraft observations at 22 sites of the NOAA Earth System Research Laboratory, Global Monitoring Division (NOAA/ESRL/GMD), ranging from the Arctic to the tropical South Pacific Ocean, but their altitudes are usually above 300 hPa. The results show the bias of the retrieved CH4 profiles for this version is ?1.4～0.1% and its RMS difference is about 0.5–1.6%, depending on altitude. These validation comparisons provide critical assessment of the retrieval algorithm and will continue using more in situ observations together with future improvement to the retrieval algorithm. AIRS CH4 products include not only the CH4 profile but also the information content. As examples, the products of AIRS CH4 in August 2004 and the difference of CH4 in May and September 2004 are shown. From these results a few features are evident: (1) a large AIRS CH4 plume southwest of the Tibetan plateau that may be associated with deep convection during the Asian summer monsoon; (2) high mixing ratios of AIRS CH4 in southeastern Asia and in the high northern hemisphere in the summer; and (3) the increase of AIRS CH4 from May to September in the high northern hemisphere that is likely linked with wetland emission but needs more study. Further analysis of these data and its comparison with model data will be addressed in a separate paper.
机译：本文介绍了在EOS / Aqua平台上通过大气红外测深仪（AIRS）检索大气甲烷（CH4）垂直剖面的特征和验证。 7.6微米附近的AIRS通道用于CH4检索，它们对中高层对流层最为敏感，即在热带地区约为200–300 hPa，在极地地区约为400–500 hPa。通过使用独立的AIRS通道和高级微波探测单元（AMSU）进行的反演获得了推算CH4所需的大气温度-湿度曲线，表面皮肤温度和发射率。将AIRS检索到的剖面与一些原位飞机CH4剖面进行比较表明，在AIRS检索系统V4.0中使用的正向模型要求强吸收通道的甲烷吸收系数增加2％，并且该偏差调整是在AIRS检索中实现的系统V5.0。作为V5.0中的新运行产品，AIRS CH4已在从北极到热带南太平洋的全球监测部门（NOAA / ESRL / GMD）的NOAA地球系统研究实验室的22个地点进行了现场飞机观测，从而得到了验证海洋，但它们的高度通常高于300 hPa。结果表明，根据海拔高度的不同，该版本CH4剖面的偏差为？1.4〜0.1％，其RMS差异约为0.5–1.6％。这些验证比较提供了对检索算法的关键评估，并将继续使用更多的原位观察结果以及对检索算法的未来改进。 AIRS CH4产品不仅包括CH4配置文件，还包括信息内容。例如，显示了2004年8月AIRS CH4的产品以及2004年5月和2004年9月CH4的差异。从这些结果可以看出一些特征：（1）青藏高原西南的大AIRS CH4羽状流，可能与亚洲夏季风期间的深对流有关; （2）夏季，东南亚和北半球高空的AIRS CH4混合比高; （3）北半球高空地区5月至9月AIRS CH4的增加，这可能与湿地排放有关，但需要更多研究。这些数据的进一步分析及其与模型数据的比较将在另一篇论文中介绍。

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