DOI: 10.1038/ngeo2739
论文题名: Proportions of convective and stratiform precipitation revealed in water isotope ratios
作者: Aggarwal P.K. ; Romatschke U. ; Araguas-Araguas L. ; Belachew D. ; Longstaffe F.J. ; Berg P. ; Schumacher C. ; Funk A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 8 起始页码: 624
结束页码: 629
语种: 英语
Scopus关键词: air mass
; chemical composition
; climate change
; climate modeling
; cloud microphysics
; condensation
; convective system
; precipitation (climatology)
; precipitation quality
; rainfall
; stable isotope
; stratiform cloud
; tritium
; TRMM
英文摘要: Tropical and midlatitude precipitation is fundamentally of two types, spatially limited and high-intensity convective or widespread and lower-intensity stratiform, owing to differences in vertical air motions and microphysical processes governing rain formation. These processes are difficult to observe or model and precipitation partitioning into rain types is critical for understanding how the water cycle responds to changes in climate. Here, we combine two independent data sets - convective and stratiform precipitation fractions, derived from the Tropical Rainfall Measuring Mission satellite or synoptic cloud observations, and stable isotope and tritium compositions of surface precipitation, derived from a global network - to show that isotope ratios reflect rain type proportions and are negatively correlated with stratiform fractions. Condensation and riming associated with boundary layer moisture produces higher isotope ratios in convective rain, along with higher tritium when riming in deep convection occurs with entrained air at higher altitudes. On the basis of our data, stable isotope ratios can be used to monitor changes in the character of precipitation in response to periodic variability or changes in climate. Our results also provide observational constraints for an improved simulation of convection in climate models and a better understanding of isotope variations in proxy archives, such as speleothems and tropical ice. © 2016 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105957
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Isotope Hydrology Section, International Atomic Energy Agency, Vienna, Austria; Department of Earth Sciences, University of Western Ontario, London, ON, Canada; Hydrology Unit, Swedish Meteorological and Hydrological Institute, Norrköping, Sweden; Department of Atmospheric Sciences, Texas A and M University, College Station, TX, United States
Recommended Citation:
Aggarwal P.K.,Romatschke U.,Araguas-Araguas L.,et al. Proportions of convective and stratiform precipitation revealed in water isotope ratios[J]. Nature Geoscience,2016-01-01,9(8)