干旱区生态环境知识资源中心(Arid): 黄土塬区大气降水的氢氧稳定同位素特征及水汽来源

Arid

	黄土塬区大气降水的氢氧稳定同位素特征及水汽来源
其他题名	Analysis of stable isotopic composition and vapor source of precipitation at the Changwu Loess Tableland
	陈曦1 ; 李志 2; 程立平 3; 刘文兆 4; 王锐 5
来源期刊	生态学报
ISSN	1000-0933
出版年	2016
卷号	36 期号:1 页码:98-106
中文摘要	降水是水资源的主要输入,分析其氢氧稳定同位素特征可为水循环研究提供重要的背景信息。基于4a的降水样品采集,测定和分析了黄土塬区降水氢氧同位素(~2H,~(17)O和~(18)O)的组成特征,进而分析了其水汽来源。降水同位素有明显的年内变化,2-6月富集而711月贫化;deltaD和delta~(18)O存在雨量效应和温度效应,分别出现在69月和105月;但这些组成特征受气候变异影响存在年际差异。综合分析降水方程线、D盈余和~(17)O盈余,发现黄土塬区69月降水来自海洋性气团,105月降水是局地水汽蒸发和大陆性气团起主导作用;雨季少数降水事件直接来源于海洋性气团,其他降水事件则是海洋性气团经再分配相对湿度达90%左右时才产生。全年至少30%的降水事件经历了严重的二次蒸发。
英文摘要	As important constituents of a water molecule, the stable hydrogen and oxygen isotopes are ideal conservative tracers for water source, and thus, have been widely used in water cycle research. Precipitation is the main input of water resources; therefore,analysis of its hydrogen and oxygen isotopic compositions can provide basic information for water cycle. Until now, some research has been carried out for the arid and semi-arid regions on the Loess Plateau; however, few studies have focused on the semi-humid region. The Changwu Loess Tableland, which is located in the southern part of the central Loess Plateau and is characterized by a warm temperate, semi-humid, continental monsoon climate (annual mean precipitation is 578 mm),has been studied. In this study, the hydrogen and oxygen isotopic compositions (~2H,~(18)O and ~(17)O) of precipitation and some climatic factors (temperature, precipitation amount, humidity) of four years (2005,2010, 20122013) have been determined fort the investigation of the vapor source of precipitation. Both seasonal and inter-annual variations were detected from the isotopic compositions of the precipitation. The isotopic compositions were more depleted from July to November, and the delta~(18)O and 8D varied from - 12.42 to -9.96 and from -88.62 to -65.18%o, respectively; however, they were more enriched from February to June, and the ranges of delta~(18)O and deltaD were -7.89 to -5.08 and -50.08 to -27.90, respectively. The most abundant depleted isotopic compositions were observed in July, which was considered to be the effect of marine air mass and precipitation amount. deltaD and delta~(18)O had a significant relationship with the precipitation amount from June to September,and while they correlated well with air temperatures from October to May. The inter-annual variations in isotopic compositions of precipitation were mainly due to the climate variability; for example, the temperatures in the summer of 2005 were the highest since 1951, and it would, thus, yield different seasonal patterns of isotopic compositions as compared to the other three years. Meanwhile, the isotopic compositions of precipitation in the Changwu Loess Tableland were different from those of the arid regions and similar to some of the humid monsoon regions. According to the analysis of isotopic compositions, meteoric water line, D-excess, and ~(17)O excess, the marine air mass was the dominant vapor source for precipitation from June to September, especially from July to September, while precipitation from October to May were significantly influenced by regional evaporation and continental air mass. Furthermore, the weighted average D-excess of most months was higher than the global average (10),which implied that the isotopic compositions were influenced by local evaporation throughout the year. In rainy season,a few precipitation events were directly associated with marine air mass,while the other events occurred only when the relative humidity exceeded 90% due to the reallocation of marine air mass. At least 30% of the precipitation events have experienced serious secondary evaporation. Analysis of the vapor source by ~(17)O is still at the preliminary stage and few researches have been done in China; therefore, studying ~(17)O concentrations can provide additional useful information to interpret the water cycle in future research.
中文关键词	大气降水 ; 氢氧同位素 ; 水汽来源 ; 黄土塬区 ; ~(17)O盈余
英文关键词	precipitation oxygen and hydrogen isotope water vapor trajectory loess tableland ~(17)O- excess
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5611093
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234741
作者单位	1.西北农林科技大学资源环境学院, 杨凌, 712100; 2.西北农林科技大学资源环境学院, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌, 712100; 3.平顶山学院资源与环境科学学院, 平顶山, 河南 467000, 中国; 4.黄土高原土壤侵蚀与旱地农业国家重点实验室, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌, 712100; 5.河南理工大学测绘与国土信息工程学院, 焦作, 河南 454000, 中国
推荐引用方式 GB/T 7714	陈曦,李志,程立平,等. 黄土塬区大气降水的氢氧稳定同位素特征及水汽来源[J]. 西北农林科技大学,2016,36(1):98-106.
APA	陈曦,李志,程立平,刘文兆,&王锐.(2016).黄土塬区大气降水的氢氧稳定同位素特征及水汽来源.生态学报,36(1),98-106.
MLA	陈曦,et al."黄土塬区大气降水的氢氧稳定同位素特征及水汽来源".生态学报 36.1(2016):98-106.