干旱区生态环境知识资源中心(Arid): Quantifying the effect of moisture source and transport on the precipitation isotopic variations in northwest Ethiopian Highland

Arid

DOI	10.1016/j.jhydrol.2021.127322
	Quantifying the effect of moisture source and transport on the precipitation isotopic variations in northwest Ethiopian Highland
	Wu, Shuang-Ye; Bedaso, Zelalem
通讯作者	Wu, SY (corresponding author)，Univ Dayton, Dept Geol & Environm Geosci, 300 Coll Pk, Dayton, OH 45469 USA.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2022
卷号	605
英文摘要	Understanding the controlling factors for variations of precipitation isotopes is essential for accurate interpretation of isotope-based paleoclimate proxy data as well as better apprehension of the hydrological cycle. These are particularly important for Ethiopia, an arid region and important location for studying human evolution. Past studies have established the importance of moisture source on isotopic variation in precipitation, but few studies have identified exact moisture sources and quantified their contributions. In this study, we use a Lagrangian moisture diagnostic technique and daily precipitation isotope data collected at Debre Markos on the northwest Ethiopian Highland to quantify the contributions of different moisture sources to precipitation. We also quantitatively establish the relative importance of local climate conditions, climate conditions of moisture uptake locations, and different moisture sources on the isotopic variation in precipitation at the study site. Our results show that recycled continental moisture from adjacent areas is the most dominant moisture source throughout the year (67%), and its contribution is higher in the wet season (79%) than in the dry season (56%). Secondary moisture sources include the southern Indian Ocean (16%) for the wet season and the northern Indian Ocean (14%) for the dry season. Based on correlation analyses, we find that the most important control over the precipitation isotopic variation is the convective intensity at both the study site and the moisture uptake locations. Strong connective activities are linked to low isotopic values, and the seasonal movement of the deep convection region could explain the seasonal precipitation delta 18O patterns with low values in the wet season and high values in the dry season. Other climate factors that affect the isotopic composition of precipitation include local temperature, relative humidity, rainfall amount as well as total rainout along the trajectories and relative humidity at moisture uptake locations. Our study could provide new perspectives for interpreting delta 18O-based paleoclimate proxies in this region, as well as crucial information for understanding hydrocliamte processes in a region where sustainable water resources are of particular importance for socioeconomic development.
英文关键词	Precipitation isotope Moisture source Ethiopia HYSPLIT
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000752489000003
WOS关键词	STABLE-ISOTOPES ; RAINFALL ; RECONSTRUCTION ; EVAPORATION ; DELTA-O-18 ; OXYGEN ; WATER
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376880
作者单位	[Wu, Shuang-Ye; Bedaso, Zelalem] Univ Dayton, Dept Geol & Environm Geosci, 300 Coll Pk, Dayton, OH 45469 USA
推荐引用方式 GB/T 7714	Wu, Shuang-Ye,Bedaso, Zelalem. Quantifying the effect of moisture source and transport on the precipitation isotopic variations in northwest Ethiopian Highland[J],2022,605.
APA	Wu, Shuang-Ye,&Bedaso, Zelalem.(2022).Quantifying the effect of moisture source and transport on the precipitation isotopic variations in northwest Ethiopian Highland.JOURNAL OF HYDROLOGY,605.
MLA	Wu, Shuang-Ye,et al."Quantifying the effect of moisture source and transport on the precipitation isotopic variations in northwest Ethiopian Highland".JOURNAL OF HYDROLOGY 605(2022).