Short-term variations of vapor isotope ratios reveal the influence of atmospheric processes

CORC > 地理科学与资源研究所 > 中国科学院地理科学与资源研究所 > 生态系统研究网络观测与模拟重点实验室 > CERN水分分中心

	Short-term variations of vapor isotope ratios reveal the influence of atmospheric processes
	Yu Guirui
刊名	JOURNAL OF GEOGRAPHICAL SCIENCES
	2011
卷号	21 期号:3 页码:401-416
关键词	stables isotopes atmospheric water vapor precipitation TDLAS
ISSN号	1009-637X
通讯作者	Wen XF
学科主题	Geography ; Physical
收录类别	SCI
资助信息	National Natural Science Foundation of China [30970517, 31070408]; Ministry of Science and Technology of China [2010CB833501]; Chinese Academy of Sciences [KZCX2-EW-QN305]
公开日期	2011-06-10
附注	Stable isotopes of atmospheric water vapor reveal rich information on water movement and phase changes in the atmosphere. Here we presented two nearly continuous time-series of delta D and delta O-18 of atmospheric water vapor (delta(v)) measured at hourly intervals in surface air in Beijing and above a winter wheat canopy in Shijiazhuang using in-situ measurement technique. During the precipitation events, the delta(v) values in both Beijing and Shijiazhuang were in the state of equilibrium with precipitation water, revealing the influence of precipitation processes. However, the delta(v) departures from the equilibrium state were positively correlated with local relative humidity. Note that the delta(v) tended to enrich in Beijing, but deplete in Shijiazhuang during the precipitation events, which mainly resulted from the influence of transpiration processes that enriched the delta(v) in Shijiazhuang. On seasonal time-scale, the delta(v) values were log-linear functions of water vapor mixing ratios in both Beijing and Shijiazhuang. The water vapor mixing ratio was an excellent predictor of the delta(v) by the Rayleigh distillation mechanisms, indicating that air mass advection could also play an important role in determining the delta(v). On a diurnal time-scale, the delta(v) reached the minimum in the early afternoon hours in Beijing which was closely related to the atmospheric processes of boundary layer entrainment. During the peak of growing season of winter wheat, however, the delta(v) reached the minimum in the early morning, and increased gradually through the daytime, and reached the maximum in the late afternoon, which was responsible by the interaction between boundary layer entrainment and the local atmospheric processes, such as transpiration and dew formation. This study has the implications for the important role of vegetation in determining the surface delta(v) and highlights the need to conduct delta(v) measurement on short-term (e.g. diurnal) time scales.
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/4321]
专题	地理科学与资源研究所_生态系统研究网络观测与模拟重点实验室_CERN水分分中心
推荐引用方式 GB/T 7714	Yu Guirui. Short-term variations of vapor isotope ratios reveal the influence of atmospheric processes[J]. JOURNAL OF GEOGRAPHICAL SCIENCES,2011,21(3):401-416.
APA	Yu Guirui.(2011).Short-term variations of vapor isotope ratios reveal the influence of atmospheric processes.JOURNAL OF GEOGRAPHICAL SCIENCES,21(3),401-416.
MLA	Yu Guirui."Short-term variations of vapor isotope ratios reveal the influence of atmospheric processes".JOURNAL OF GEOGRAPHICAL SCIENCES 21.3(2011):401-416.