气候变化领域集成服务门户(CCPortal): Spectrally resolved fluxes from IASI data: Retrieval algorithm for clear-sky measurements

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DOI	10.1175/JCLI-D-19-0523.1
	Spectrally resolved fluxes from IASI data: Retrieval algorithm for clear-sky measurements
	Whitburn S.; Clarisse L.; Bauduin S.; George M.; Hurtmans D.; Safieddine S.; Coheur P.F.; Clerbaux C.
发表日期	2020
ISSN	0894-8755
起始页码	6971
结束页码	6988
卷号	33 期号:16
英文摘要	Space-based measurements of the outgoing longwave radiation (OLR) are essential for the study of Earth's climate system. While the CERES instrument provides accurate measurements of this quantity, its measurements are not spectrally resolved. Here we present a high-resolution OLR product (sampled at 0.25 cm21), derived from measurements of the IASI satellite sounder. The applied methodology relies on precalculated angular distribution models (ADMs). These are usually calculated for tens to hundreds of different scene types (characterized by surface and atmosphere parameters). To guarantee accurate results in the range 645-2300 cm21 covered by IASI, we constructed ADMs for over 140 000 scenes. These were selected from one year of CAMS reanalysis data. A dissimilarity-based selection algorithm was applied to choose scenes as different from each other as possible, thereby maximizing the performance on real data, while keeping the number of scenes manageable. A comparison of the IASI OLR integrated over the 645-2300 cm21 range was performed with the longwave broadband OLR products from CERES and the AIRS instrument. The latter are systematically higher due to the contribution of the far infrared to the total IR spectral range, but as expected exhibit generally high spatial correlations with the IASI OLR, except for some areas in the tropical region. We also compared the IASI OLR against the spectrally resolved OLR derived from AIRS. A good agreement was found above 1200 cm21 while AIRS OLR appeared to be systematically higher in the atmospheric window region, likely related to differences in overpass time or to the use of a different cloud detection algorithm. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Angular distribution; Earth (planet); Infrared devices; Accurate measurement; Angular distribution models; Atmospheric window; Cloud detection algorithms; Outgoing longwave radiation; Retrieval algorithms; Selection algorithm; Spatial correlations; Infrared instruments; accuracy assessment; algorithm; clear sky; correlation; IASI; longwave radiation; satellite data; solar radiation; spectral analysis
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171176
作者单位	Atmospheric Spectroscopy, Service de Chimie Quantique et Photophysique, Université Libre de Bruxelles, Brussels, Belgium; LATMOS, IPSL, Sorbonne Université, UVSQ, CNRS, Paris, France
推荐引用方式 GB/T 7714	Whitburn S.,Clarisse L.,Bauduin S.,et al. Spectrally resolved fluxes from IASI data: Retrieval algorithm for clear-sky measurements[J],2020,33(16).
APA	Whitburn S..,Clarisse L..,Bauduin S..,George M..,Hurtmans D..,...&Clerbaux C..(2020).Spectrally resolved fluxes from IASI data: Retrieval algorithm for clear-sky measurements.Journal of Climate,33(16).
MLA	Whitburn S.,et al."Spectrally resolved fluxes from IASI data: Retrieval algorithm for clear-sky measurements".Journal of Climate 33.16(2020).