气候变化领域集成服务门户(CCPortal): Near-Surface Air Temperature Dependence on Elevation and Geographical Coordinates Over Tropical Desert Land Surfaces

CCPortal

DOI	10.3389/feart.2021.777381
	Near-Surface Air Temperature Dependence on Elevation and Geographical Coordinates Over Tropical Desert Land Surfaces
	Kattel, Dambaru Ballab; Salih, Haitham Aabdin Mohamed; Yao, Tandong; Ullah, Kalim
通讯作者	Kattel, DB (通讯作者)
发表日期	2022
EISSN	2296-6463
卷号	9
英文摘要	This study examined 30-year of in situ observations (1981-2010) to determine monthly, and diurnal characteristics of near-surface temperature gradients (TG) in the Sudanese desert, both spatially and with elevation. The TG variation, along with its spatial and elevation dependence, forcing mechanisms for its variability, and its relationship with moisture and gradients of other climatic variables, were evaluated using a multi-collinearity approach and empirical analysis, respectively. A distinct annual cycle was observed in both the temperature gradient (or lapse rate) with elevation (TG(E)) and the temperature gradient with latitude (TG(Lat)). The TG(E) is strongly negative during the warmer months (summer) and less strongly negative (or even positive) during the colder months (winter). However, for TG(Lat,) the results are reversed. The mean TG(E) value steepens during the summer due to intense adiabatic cooling during the day and less inversion during the night, while this process is reversed for the observed shallower TG(Lat) value in the same season. This result is attributed to desert characteristics at the northern lower elevations or higher latitudes, as well as the effects of the ITCZ, moisture, and cloud cover as a result of high elevations at lower latitudes in the south and southwest region. Low solar insolation, and Mediterranean cold airflow and littoral effect, combined with inversion and radiative cooling at lower elevations or northern higher latitudes, lead the TG(E) (TG(Lat)) value to be shallow (steep) during the drier months. Excluding the inversion and radiative cooling at night, this effect is more pronounced in the winter. The extreme high and low values of TG(E) and TG(Lat), as well as their diurnal range, were found to strongly coincide with variations in the equatorial trough, as well as diurnal radiative energy differences and the regional synoptic phenomenon. In addition to being valuable for hydro-climatic, ecological, and agricultural modeling, this study can be replicated in other tropical desert areas around the world to gain a better understanding of desert's climate.
关键词	LAPSE RATES LANDSCAPE-SCALE CLIMATE TRENDS HOMOGENEITY DIFFERENCE SATELLITE EVOLUTION NORTHERN BASIN
英文关键词	temperature gradients; extreme values; diurnal variation; monthly variation; Controls; tropical desert regions; Sudan
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000772534600001
来源期刊	FRONTIERS IN EARTH SCIENCE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260616
推荐引用方式 GB/T 7714	Kattel, Dambaru Ballab,Salih, Haitham Aabdin Mohamed,Yao, Tandong,et al. Near-Surface Air Temperature Dependence on Elevation and Geographical Coordinates Over Tropical Desert Land Surfaces[J]. 中国科学院青藏高原研究所,2022,9.
APA	Kattel, Dambaru Ballab,Salih, Haitham Aabdin Mohamed,Yao, Tandong,&Ullah, Kalim.(2022).Near-Surface Air Temperature Dependence on Elevation and Geographical Coordinates Over Tropical Desert Land Surfaces.FRONTIERS IN EARTH SCIENCE,9.
MLA	Kattel, Dambaru Ballab,et al."Near-Surface Air Temperature Dependence on Elevation and Geographical Coordinates Over Tropical Desert Land Surfaces".FRONTIERS IN EARTH SCIENCE 9(2022).