干旱区生态环境知识资源中心(Arid): 青藏高原西北部大气降水稳定同位素时空特征变化

Arid

	青藏高原西北部大气降水稳定同位素时空特征变化
其他题名	Temporal and Spatial Characteristics of Stable Isotopes of Atmospheric Precipitation in the Northwestern Tibetan Plateau
	孙从建 1; 张子宇 1; 李捷 2; 陈若霞 1; 李伟 1
来源期刊	山地学报
ISSN	1008-2786
出版年	2018
卷号	36 期号:2 页码:217-228
中文摘要	作为水环境的重要指示剂,稳定同位素已经成为区域水文学、气候学研究的重要工具。降水作为水循环的输入项,其同位素组成是研究山地地表水过程、地下水形成转化、冰川变化等问题的必要信息。为了进一步增加对于青藏高原西北部降水过程及其控制因素的认识,本文基于青藏高原西北部五个长期观测站点降水中deltaD和delta~(18)O数据,研究了青藏高原西北部与塔里木盆地交界地区大气降水稳定同位素时空分布特征。分析结果显示该地区降水稳定同位素季节变化较为明显,表现出夏高冬低的变化趋势,不同月份呈现出不同的空间分布特征。除狮泉河站降水delta~(18)O值与温度关系不显著外,其余站点delta~(18)O值随温度升高而增加。区域内降水量对降水delta~(18)O值的影响不显著,降水稳定同位素高程效应明显,降水delta~(18)O值随海拔上升而降低。降水过量氘(d值)的分布也呈现出显著的季节差异,总体表现出夏半年高、冬半年低的特点,受水汽再循环的影响,西合休站夏季降水的d值呈现较高的水平。研究表明,气温是控制该地区降水同位素分馏的重要因素,通过对于该区域降水蒸发比的计算发现,该地区临近沙漠的和田站的降水同位素受蒸发作用最为显著,而高海拔地区的狮泉河站降水受蒸发影响最小。
英文摘要	As an important indicator of water environment,stable isotope has become an important tool for regional hydrology and climatology research. Precipitation as an input of water cycle,its isotopic composition is necessary information for the study of mountain surface water process,groundwater formation and transformation,glacial change and other issues. In order to further increase understanding of the precipitation process and its controlling factors in the northwestern Tibetan Plateau,this paper has studied spatial and temporal distribution characteristics of stable isotope of atmospheric precipitation in the area between the northwestern Qinghai-Xizang Plateau and the Tarim Basin,based on the data of precipitation deltaD and delta~(18)O obtained at five long-term observation stations in the northwest of the Tibetan Plateau. The analysis results showed that the seasonal variations of precipitation stable isotopes in this area were obvious,showing a trend of high in summer and low in winter,and in different months it presented different spatial distribution characteristics. Except that the precipitation delta~(18) O value at the Shiquanhe station had no significant relationship with temperature,the delta~(18)O values at other stations increased with the increase of temperature. The influence of precipitation in the area on the value of precipitation delta~(18)O was not significant,but the elevation effect of precipitation stable isotope was obvious. The value of precipitation delta~(18)O decreased with elevation. The distribution of precipitation excess deuterium (d value) also showed a significant seasonal difference. The overall pattern was high in summer and low in winter. Affected by water vapor recirculation,the value of d in summer precipitation at Xihehei station was higher. Studies suggested that temperature was an important factor in controlling the isotope fractionation of precipitation in the area. Through the calculation of the precipitation-evaporation ratio in this area,it was found that the precipitation isotopes at the Hetian station near the desert were most significantly affected by evaporation,and at the Shiquan station with high altitudes,precipitation was minimally affected by evaporation.
中文关键词	大气降水 ; 时空分布 ; 蒸发富集
英文关键词	deltaD delta~(18)O precipitation deltaD delta~(18)O spatial-temporal distribution evaporation enrichment
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOGRAPHY
WOS研究方向	Geography
CSCD记录号	CSCD:6241014
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238052
作者单位	1.山西师范大学地理科学学院, 临汾, 山西 041000, 中国; 2.中国科学院地质与地球物理研究所, 北京 100029, 中国
推荐引用方式 GB/T 7714	孙从建,张子宇,李捷,等. 青藏高原西北部大气降水稳定同位素时空特征变化[J],2018,36(2):217-228.
APA	孙从建,张子宇,李捷,陈若霞,&李伟.(2018).青藏高原西北部大气降水稳定同位素时空特征变化.山地学报,36(2),217-228.
MLA	孙从建,et al."青藏高原西北部大气降水稳定同位素时空特征变化".山地学报 36.2(2018):217-228.