气候变化领域集成服务门户(CCPortal): Observation of absorbing aerosols above clouds over the south-east Atlantic Ocean from the geostationary satellite SEVIRI - Part 2: Comparison with MODIS and aircraft measurements from the CLARIFY-2017 field campaign

CCPortal

DOI	10.5194/acp-21-3235-2021
	Observation of absorbing aerosols above clouds over the south-east Atlantic Ocean from the geostationary satellite SEVIRI - Part 2: Comparison with MODIS and aircraft measurements from the CLARIFY-2017 field campaign
	Peers F.; Francis P.; Abel S.J.; Barrett P.A.; Bower K.N.; Cotterell M.I.; Crawford I.; Davies N.W.; Fox C.; Fox S.; Langridge J.M.; Meyer K.G.; Platnick S.E.; Szpek K.; Haywood J.M.
发表日期	2021
ISSN	1680-7316
起始页码	3235
结束页码	3254
卷号	21 期号:4
英文摘要	To evaluate the SEVIRI retrieval for aerosols above clouds presented in Part 1 of the companion paper, the algorithm is applied over the south-east Atlantic Ocean during the CLARIFY-2017 field campaign period. The first step of our analysis compares the retrieved aerosol and cloud properties against equivalent products from the MODIS MOD06ACAERO retrieval (Meyer et al., 2015). While the correlation between the two satellite retrievals of the above-cloud aerosol optical thickness (AOT) is good (R = 0.78), the AOT retrieved by SEVIRI is 20.3 % smaller than that obtained from the MODIS retrieval. This difference in AOT is attributed mainly to the more absorbing aerosol model assumed for the SEVIRI retrieval compared to MODIS. The underlying cloud optical thickness (COT) derived from the two satellites is in good agreement (R = 0.90). The cloud droplet effective radius (CER) retrieved by SEVIRI is consistently smaller than MODIS by 2.2 μm, which is mainly caused by the use of different spectral bands of the satellite instruments. In the second part of our analysis, we compare the forecast water vapour profiles used for the SEVIRI atmospheric correction as well as the aforementioned aerosol and cloud products with in situ measurements made from the Facility for Airborne Atmospheric Measurements (FAAM) aircraft platform during the CLARIFY-2017 campaign. Around Ascension Island, the column water vapour used to correct the SEVIRI signal is overestimated by 3.1 mm in the forecast compared to that measured by dropsondes. However, the evidence suggests that the accuracy of the atmospheric correction improves closer to the African coast. Consistency is observed between the SEVIRI above-cloud AOT and in situ measurements (from cavity ring-down spectroscopy instruments) when the measured single-scattering albedo is close to that assumed in the retrieval algorithm. On the other hand, the satellite retrieval overestimates the AOT when the assumed aerosol model is not absorbing enough. Consistency is also found between the cloud properties retrieved by SEVIRI and the CER measured by a cloud droplet probe and the liquid water path derived from a microwave radiometer. Despite the instrumental limitations of the geostationary satellite, the consistency obtained between SEVIRI, MODIS and the aircraft measurements demonstrates the ability of the retrieval in providing additional information on the temporal evolution of the aerosol properties above clouds. © Author(s) 2021.
语种	英语
scopus关键词	absorption; accuracy assessment; aerosol; aerosol property; airborne survey; algorithm; atmospheric correction; cloud microphysics; comparative study; geostationary satellite; in situ measurement; marine atmosphere; MODIS; optical depth; SEVIRI; Atlantic Coast [Africa]; Atlantic Ocean; Atlantic Ocean (Southeast); Satellites
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247096
作者单位	College of Engineering, Mathematics, and Physical Sciences, University of Exeter, Exeter, United Kingdom; Met Office, Fitzroy Road, Exeter, United Kingdom; Centre for Atmospheric Science, School of Earth and Environmental Science, University of Manchester, Manchester, United Kingdom; NASA, GSFCMD, United States; Laboratoire d'Optique Atmosphérique, Université de Lille, Villeneuve-d'Ascq, France; School of Chemistry, University of Bristol, Bristol, United Kingdom
推荐引用方式 GB/T 7714	Peers F.,Francis P.,Abel S.J.,et al. Observation of absorbing aerosols above clouds over the south-east Atlantic Ocean from the geostationary satellite SEVIRI - Part 2: Comparison with MODIS and aircraft measurements from the CLARIFY-2017 field campaign[J],2021,21(4).
APA	Peers F..,Francis P..,Abel S.J..,Barrett P.A..,Bower K.N..,...&Haywood J.M..(2021).Observation of absorbing aerosols above clouds over the south-east Atlantic Ocean from the geostationary satellite SEVIRI - Part 2: Comparison with MODIS and aircraft measurements from the CLARIFY-2017 field campaign.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(4).
MLA	Peers F.,et al."Observation of absorbing aerosols above clouds over the south-east Atlantic Ocean from the geostationary satellite SEVIRI - Part 2: Comparison with MODIS and aircraft measurements from the CLARIFY-2017 field campaign".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.4(2021).