Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-17-2981-2017 |
Fast retrievals of tropospheric carbonyl sulfide with IASI | |
Vincent, R. Anthony; Dudhia, Anu | |
2017-02-28 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | Iterative retrievals of trace gases, such as carbonyl sulfide (OCS), from satellites can be exceedingly slow. The algorithm may even fail to keep pace with data acquisition such that analysis is limited to local events of special interest and short time spans. With this in mind, a linear retrieval scheme was developed to estimate total column amounts of OCS at a rate roughly 104 times faster than a typical iterative retrieval. This scheme incorporates two concepts not utilized in previously published linear estimates. First, all physical parameters affecting the signal are included in the state vector and accounted for jointly, rather than treated as effective noise. Second, the initialization point is determined from an ensemble of atmospheres based on comparing the model spectra to the observations, thus improving the linearity of the problem. All of the 2014 data from the Infrared Atmospheric Sounding Interferometer (IASI), instruments A and B, were analysed and showed spatial features of OCS total columns, including depletions over tropical rainforests, seasonal enhancements over the oceans, and distinct OCS features over land. Error due to assuming linearity was found to be on the order of 11% globally for OCS. However, systematic errors from effects such as varying surface emissivity and extinction due to aerosols have yet to be robustly characterized. Comparisons to surface volume mixing ratio in situ samples taken by NOAA show seasonal correlations greater than 0.7 for five out of seven sites across the globe. Furthermore, this linear scheme was applied to OCS, but may also be used as a rapid estimator of any detectable trace gas using IASI or similar nadir-viewing instruments. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000395147600001 |
WOS关键词 | GLOBAL BIOGEOCHEMICAL CYCLE ; RADIATIVE-TRANSFER ; NEW-MODEL ; SINKS ; PARAMETERS ; OCS |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29501 |
专题 | 地球科学 |
作者单位 | Univ Oxford, Clarendon Lab, Atmospher Ocean & Planetary Phys, Parks Rd, Oxford OX1 3PU, England |
推荐引用方式 GB/T 7714 | Vincent, R. Anthony,Dudhia, Anu. Fast retrievals of tropospheric carbonyl sulfide with IASI[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(4). |
APA | Vincent, R. Anthony,&Dudhia, Anu.(2017).Fast retrievals of tropospheric carbonyl sulfide with IASI.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(4). |
MLA | Vincent, R. Anthony,et al."Fast retrievals of tropospheric carbonyl sulfide with IASI".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.4(2017). |
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