DOI: 10.5194/hess-24-4491-2020
论文题名: Novel Keeling-plot-based methods to estimate the isotopic composition of ambient water vapor
作者: Yuan Y. ; Du T. ; Wang H. ; Wang L.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期: 9 起始页码: 4491
结束页码: 4501
语种: 英语
Scopus关键词: Atmospheric composition
; Evapotranspiration
; Isotopes
; Regression analysis
; Ambient waters
; Atmospheric water vapor
; General method
; Intersection points
; Isotope compositions
; Isotopic composition
; Single particle
; Terrestrial ecosystems
; Water vapor
; analytical framework
; carbon dioxide
; evapotranspiration
; isotopic composition
; Lagrangian analysis
; numerical model
; regression analysis
; tracking
; water vapor
英文摘要: The Keeling plot approach, a general method to identify the isotopic composition of source atmospheric CO2and water vapor (i.e., evapotranspiration), has been widely used in terrestrial ecosystems. The isotopic composition of ambient water vapor (a), an important source of atmospheric water vapor, is not able to be estimated to date using the Keeling plot approach. Here we proposed two new methods to estimate a using the Keeling plots: one using an intersection point method and another relying on the intermediate value theorem. As the actual a value was difficult to measure directly, we used two indirect approaches to validate our new methods. First, we performed external vapor tracking using the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model to facilitate explaining the variations of a. The trajectory vapor origin results were consistent with the expectations of the a values estimated by these two methods. Second, regression analysis was used to evaluate the relationship between a values estimated from these two independent methods, and they are in strong agreement. This study provides an analytical framework to estimate a using existing facilities and provides important insights into the traditional Keeling plot approach by showing (a) a possibility to calculate the proportion of evapotranspiration fluxes to total atmospheric vapor using the same instrumental setup for the traditional Keeling plot investigations and (b) perspectives on the estimation of isotope composition of mbient CO2(a13C). © 2020 Copernicus GmbH. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162597
Appears in Collections: 气候变化与战略
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作者单位: Yuan, Y., Center for Agricultural Water Research in China, China Agricultural University, Beijing, 100083, China, Department of Earth Sciences, Indiana University-Purdue University Indianapolis, Indianapolis, IN, United States; Du, T., Center for Agricultural Water Research in China, China Agricultural University, Beijing, 100083, China; Wang, H., Department of Mathematical Sciences, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, United States; Wang, L., Department of Earth Sciences, Indiana University-Purdue University Indianapolis, Indianapolis, IN, United States
Recommended Citation:
Yuan Y.,Du T.,Wang H.,et al. Novel Keeling-plot-based methods to estimate the isotopic composition of ambient water vapor[J]. Hydrology and Earth System Sciences,2020-01-01,24(9)