气候变化领域集成服务门户(CCPortal): A Global Survey of Apparent Aerosol-Cloud Interaction Signals

CCPortal

DOI	10.1029/2019JD031287
	A Global Survey of Apparent Aerosol-Cloud Interaction Signals
	Oreopoulos L.; Cho N.; Lee D.
发表日期	2020
ISSN	2169897X
卷号	125 期号:1
英文摘要	We update and expand analysis of the apparent responses to aerosol variations of the planet's cloud regimes seen by the Moderate Resolution Imaging Spectroradiometer (MODIS). We distinguish between morning aerosol loadings and afternoon clouds and consider local scales explicitly. Aerosol loading is represented by gridded aerosol optical depth (AOD) from either MODIS or a reanalysis data set, while cloud information comes exclusively from MODIS. The afternoon cloud affected quantities (CAQs) examined in conjunction with morning AOD include precipitation and cloud radiative effect, in addition to cloud properties. One analysis thrust focuses on calculating global means distinguished by morning cloud regime, of afternoon CAQs, for distinct percentiles of grid cell seasonal morning AOD distributions. When the dependence of these global means on AOD is examined, we find persistent increases in cloud radiative fluxes with AOD as predicted by classic aerosol-cloud interaction paradigms, and also deviations from expected cloud responses, especially for precipitation. The other analysis thrust involves calculations at 1° scales of logarithmic CAQ sensitivities to AOD perturbations, approximated by linear regression slopes for distinct morning cloud regime groups. While the calculations are fundamentally local, we concentrate on the prevailing sensitivity signs in statistics of the slopes at global scales. Results from this second analysis approach indicate CAQ directions of change with AOD that are largely consistent with the first approach. When using a rather simple methodology where meteorological variables are treated as if they were CAQs, no conclusive results on the potential influence of meteorology on our findings are inferred. Published 2019. This article is a US Government work and is in the public domain in the USA.
英文关键词	aerosol; clouds; indirect effects; MERRA; MODIS; satellite
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186234
作者单位	NASA Goddard Space Flight Center, Greenbelt, MD, United States; University Space Research Association, Columbia, MD, United States; Morgan State University, Baltimore, MD, United States
推荐引用方式 GB/T 7714	Oreopoulos L.,Cho N.,Lee D.. A Global Survey of Apparent Aerosol-Cloud Interaction Signals[J],2020,125(1).
APA	Oreopoulos L.,Cho N.,&Lee D..(2020).A Global Survey of Apparent Aerosol-Cloud Interaction Signals.Journal of Geophysical Research: Atmospheres,125(1).
MLA	Oreopoulos L.,et al."A Global Survey of Apparent Aerosol-Cloud Interaction Signals".Journal of Geophysical Research: Atmospheres 125.1(2020).