| DOI: | 10.1002/2013GL058302
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| 论文题名: | A moisture budget perspective of the amount effect |
| 作者: | Moore M.; Kuang Z.; Blossey P.N.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-10375
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| EISSN: | 1944-10106
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| 出版年: | 2014
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| 卷: | 41, 期:4 | | 起始页码: | 1329
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| 结束页码: | 1335
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| 语种: | 英语
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| 英文关键词: | amount effect
; stable water isotopes
; tropical convection
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| Scopus关键词: | Budget control
; Evaporation
; Isotopes
; Moisture
; Rain
; Amount effects
; Cloud resolving model
; Isotopic composition
; Moisture convergence
; Precipitation rates
; Stable water isotopes
; Surface evaporation
; Tropical convection
; Vapors
; condensation
; dominance
; evaporation
; isotopic composition
; isotopic fractionation
; moisture content
; numerical model
; precipitation (climatology)
; seasonal variation
; steady-state equilibrium
; timescale
; vapor pressure
; water budget
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| 英文摘要: | A stable water isotopologue-enabled cloud-resolving model was used to investigate the cause of the amount effect on the seasonal (or longer) time scales. When the total water (vapor and condensed phase) budget of the precipitating column of air is considered, our results indicate that as convection becomes stronger and the precipitation rate increases, the δD of precipitation (δDp) depends on the isotopic composition of the converged vapor more than that of surface evaporation. Tests with disabled fractionation from rain evaporation demonstrate that this mechanism does not account for the amount effect as has been previously suggested. If the isotopic content of converged vapor is made uniform with height with a value characteristic of surface evaporation, the amount effect largely disappears, further supporting the dominance of converged vapor in changes to the δDp signal with increasing precipitation. δDp values were compared to the water budget term EP, where P is precipitation and E is evaporation. Results from this comparison support the overall conclusion that moisture convergence is central in determining the value of δD p and the strength of the amount effect in steady state. Key Points Amount effect in tropics results from isotopic content of converged vapor Previous mechanisms are not as responsible for the rain signal as was thought Knowledge of the water budget and changes how isotopes are addressed in climate ©2013. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84894257904&doi=10.1002%2f2013GL058302&partnerID=40&md5=48e5e3cc5155d46f4319c642eea7a56b
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7639
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Earth and Planetary Sciences, Harvard University, Cambridge MA, United States
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| Recommended Citation: | |
Moore M.,Kuang Z.,Blossey P.N.. A moisture budget perspective of the amount effect[J]. Geophysical Research Letters,2014-01-01,41(4).
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