气候变化领域集成服务门户(CCPortal): Land Surface Temperature Trend and Its Drivers in East Africa

CCPortal

DOI	10.1029/2020JD033446
	Land Surface Temperature Trend and Its Drivers in East Africa
	Abera T.A.; Heiskanen J.; Maeda E.E.; Pellikka P.K.E.
发表日期	2020
ISSN	2169897X
卷号	125 期号:23
英文摘要	Land surface temperature (LST) is affected by surface-atmosphere interaction. Yet, the degree to which surface and atmospheric factors impact the magnitude of LST trend is not well established. Here, we used surface energy balance, boosted regression tree model, and satellite observation and reanalysis data to unravel the effects of surface factors (albedo, sensible heat, latent heat, and ground heat) as well as incoming radiation (shortwave and longwave) on LST trends in East Africa (EA). Our result showed that 11% of EA was affected by significant (p < 0.05) daytime annual LST trends, which exhibited both cooling of −0.19 K year−1 (mainly in South Sudan and Sudan) and warming of 0.22 K year−1 (mainly in Somalia and Kenya). The nighttime LST trends affected a large part of EA (31%) and were dominated by significant warming trend (0.06 K year−1). Influenced by contrasting daytime and nighttime LST trends, the diurnal LST range reduced in 15% of EA. The modeling result showed that latent heat flux (32%), incoming longwave radiation (30%), and shortwave radiation (23%) were stronger in explaining daytime LST trend. The effects of surface factors were stronger in both cooling and warming trends, whereas atmospheric factors had stronger control only on surface cooling trends. These results indicate the differential control of surface and atmospheric factors on warming and cooling trends, highlighting the importance of considering both factors for accurate evaluation of the LST trends in the future. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	land surface temperature; MERRA-2; MODIS Aqua; surface energy balance; trend
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/185595
作者单位	Department of Geosciences and Geography, University of Helsinki, Helsinki, Finland; Institute for Atmospheric and Earth System Research, Faculty of Science, University of Helsinki, Helsinki, Finland
推荐引用方式 GB/T 7714	Abera T.A.,Heiskanen J.,Maeda E.E.,et al. Land Surface Temperature Trend and Its Drivers in East Africa[J],2020,125(23).
APA	Abera T.A.,Heiskanen J.,Maeda E.E.,&Pellikka P.K.E..(2020).Land Surface Temperature Trend and Its Drivers in East Africa.Journal of Geophysical Research: Atmospheres,125(23).
MLA	Abera T.A.,et al."Land Surface Temperature Trend and Its Drivers in East Africa".Journal of Geophysical Research: Atmospheres 125.23(2020).