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Methanol from TES global observations: retrieval algorithm and seasonal and spatial variability

机译：TES全球观测资料中的甲醇：检索算法以及季节和空间变异性

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摘要

We present a detailed description of the TES methanol (CH3OH) retrievalalgorithm, along with initial global results showing the seasonal andspatial distribution of methanol in the lower troposphere. The fulldevelopment of the TES methanol retrieval is described, includingmicrowindow selection, error analysis, and the utilization of a priori andinitial guess information provided by the GEOS-Chem chemical transportmodel. Retrieval simulations and a sensitivity analysis using the developedretrieval strategy show that TES: (i) generally provides less than 1.0piece of information, (ii) is sensitive in the lower troposphere with peaksensitivity typically occurring between ~900–700 hPa(~1–3 km) at a vertical resolution of ~5 km,(iii) has a limit of detectability between 0.5 and 1.0 ppbv RepresentativeVolume Mixing Ratio (RVMR) depending on the atmospheric conditions,corresponding roughly to a profile with a maximum concentration of at least1 to 2 ppbv, and (iv) in a simulation environment has a mean bias of 0.16 ppbvwith a standard deviation of 0.34 ppbv. Applying the newly derived TESretrieval globally and comparing the results with corresponding GEOS-Chemoutput, we find generally consistent large-scale patterns between the two.However, TES often reveals higher methanol concentrations than simulated inthe Northern Hemisphere spring, summer and fall. In the Southern Hemisphere,the TES methanol observations indicate a model overestimate over the bulk ofSouth America from December through July, and a model underestimate duringthe biomass burning season.
机译：我们介绍了TES甲醇（CH 3 OH）检索算法的详细说明，以及初步的整体结果，显示了对流层下层甲醇的季节性和空间分布。描述了TES甲醇回收的全面发展，包括微窗口选择，错误分析以及GEOS-Chem化学迁移模型提供的先验和初始猜测信息的利用。使用发达的检索策略进行的检索模拟和敏感性分析表明，TES：（i）通常提供的信息少于1.0条;（ii）对流层下部很敏感，峰值敏感性通常在〜900–700 hPa（〜1-3之间） km）的垂直分辨率为〜5 km，（iii）的可检测极限在0.5到1.0 ppbv之间。代表体积混合比（RVMR）取决于大气条件，大致对应于最大浓度至少为1-2的曲线ppbv和（iv）在仿真环境中的平均偏差为0.16 ppbv，标准偏差为0.34 ppbv。在全球范围内应用新推导的TESretrieval并将结果与​​相应的GEOS-Chemoutput进行比较，我们发现两者之间通常具有一致的大规模模式，但是TES通常显示出比北半球春季，夏季和秋季更高的甲醇浓度。在南半球，TES甲醇观测表明从12月到7月南美洲大部分地区的模型被高估，而在生物质燃烧季节期间的模型被低估了。

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