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DOI | 10.5194/acp-20-7167-2020 |
Reducing uncertainties in satellite estimates of aerosol-cloud interactions over the subtropical ocean by integrating vertically resolved aerosol observations | |
Painemal, David1,2; Chang, Fu-Lung1,2; Ferrare, Richard2; Burton, Sharon2; Li, Zhujun1,2; Smith, William L., Jr.2; Minnis, Patrick1,2; Feng, Yan3; Clayton, Marian1,2 | |
2020-06-22 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2020 |
卷号 | 20期号:12页码:7167-7177 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Satellite quantification of aerosol effects on clouds relies on aerosol optical depth (AOD) as a proxy for aerosol concentration or cloud condensation nuclei (CCN). However, the lack of error characterization of satellite-based results hampers their use for the evaluation and improvement of global climate models. We show that the use of AOD for assessing aerosol-cloud interactions (ACIs) is inadequate over vast oceanic areas in the subtropics. Instead, we postulate that a more physical approach that consists of matching vertically resolved aerosol data from the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) satellite at the cloud-layer height with Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua cloud retrievals reduces uncertainties in satellite-based ACI estimates. Combined aerosol extinction coefficients (sigma) below cloud top (sigma(BC)) from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) and cloud droplet number concentrations (N-d) from MODIS Aqua yield high correlations across a broad range of sigma(BC )values, with sigma(BC )quartile correlations >= 0.78. In contrast, CALIOP-based AOD yields correlations with MODIS N-d of 0.54-0.62 for the two lower AOD quartiles. Moreover, sigma(BC) explains 41 % of the spatial variance in MODIS N-d, whereas AOD only explains 17 %, primarily caused by the lack of spatial covariability in the eastern Pacific. Compared with sigma(BC), near-surface sigma weakly correlates in space with MODIS N-d, accounting for a 16 % variance. It is concluded that the linear regression calculated from ln(N-d)-ln(sigma(BC)) (the standard method for quantifying ACIs) is more physically meaningful than that derived from the N-d-AOD pair. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000543687000001 |
WOS关键词 | BOUNDARY-LAYER STRUCTURE ; NORTHEAST PACIFIC ; REMOTE ; MODIS ; MICROPHYSICS ; EXTINCTION ; ATLANTIC ; CERES ; DUST |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
URL | 查看原文 |
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/278111 |
专题 | 地球科学 |
作者单位 | 1.Sci Syst & Applicat Inc, Hampton, VA 23666 USA; 2.NASA, Langley Res Ctr, Hampton, VA 23691 USA; 3.Argonne Natl Lab, Lemont, IL 60439 USA |
推荐引用方式 GB/T 7714 | Painemal, David,Chang, Fu-Lung,Ferrare, Richard,et al. Reducing uncertainties in satellite estimates of aerosol-cloud interactions over the subtropical ocean by integrating vertically resolved aerosol observations[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2020,20(12):7167-7177. |
APA | Painemal, David.,Chang, Fu-Lung.,Ferrare, Richard.,Burton, Sharon.,Li, Zhujun.,...&Clayton, Marian.(2020).Reducing uncertainties in satellite estimates of aerosol-cloud interactions over the subtropical ocean by integrating vertically resolved aerosol observations.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(12),7167-7177. |
MLA | Painemal, David,et al."Reducing uncertainties in satellite estimates of aerosol-cloud interactions over the subtropical ocean by integrating vertically resolved aerosol observations".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.12(2020):7167-7177. |
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