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Atmospheric moisture budget and its regulation on the variability of summer precipitation over the Tibetan Plateau

Wang, Ziqian ; Duan, Anmin ; Yang, Song ; Ullah, Kalim

Journal of geophysical research. Atmospheres, 2017-01, Vol.122 (2), p.614-630 [Periódico revisado por pares]

Washington: Blackwell Publishing Ltd

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Título:
Atmospheric moisture budget and its regulation on the variability of summer precipitation over the Tibetan Plateau
Autor: Wang, Ziqian ; Duan, Anmin ; Yang, Song ; Ullah, Kalim
Assuntos: Annual variations ; Atmosphere ; Atmospheres ; Atmospheric circulation ; Atmospheric forcing ; Atmospheric moisture ; atmospheric moisture budget ; Atmospheric precipitations ; Boundaries ; Budgeting ; Circulation ; Control ; Datasets ; Evaporation ; Fluctuations ; Flux ; Geophysics ; Hydrologic data ; Interannual variability ; Jet stream ; Jet streams (meteorology) ; Loads (forces) ; Moisture ; Moisture budget ; North Atlantic Oscillation ; Ocean-atmosphere system ; Plateaus ; Precipitation ; Precipitation (meteorology) ; Rainfall ; Rivers ; Specific humidity ; Summer ; Summer precipitation ; Temporal variations ; Tibetan Plateau ; Transport ; Variability ; Vertical profiles
É parte de: Journal of geophysical research. Atmospheres, 2017-01, Vol.122 (2), p.614-630
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: Based on station observations and reanalysis data sets, the atmospheric moisture budget and its critical role in regulating the variability of summer precipitation over the Tibetan Plateau (TP) are investigated. Results indicate that the yearly variability of summer precipitation over the southern TP (STP) is mainly controlled by remote moisture transport. Local surface evaporation presents an infinitesimal interannual fluctuation, but it cannot be ignored since it is a large component of total precipitation amount in every summer. Although the incoming moisture transport at the western boundary of STP is much weaker than that at the southern boundary, it primarily influences the temporal variation of STP summer precipitation. Further analysis shows that the summer North Atlantic Oscillation (NAO) also possesses a significant impact on the variation of STP summer precipitation. A strong NAO apparently weakens the moisture transport at the western boundary, inducing less precipitation over the STP. When the NAO is strong, wave‐activity flux obviously diverges eastward from the subtropical high over northwestern Europe. Then such flux converges toward the western TP, which weakens the baroclinic vertical structure of atmospheric circulation over the TP. The NAO also influences the meridional position of the Asian jet stream and modulates the specific humidity and moisture transport at the western boundary of STP. In addition, the dynamic processes of the atmosphere are more important than the thermodynamic processes in regulating the variability of TP summer precipitation. Key Points The interannual variability of summer precipitation over the southern TP is mainly controlled by remote moisture transport NAO influences precipitation and eastward moisture transport over the southern TP through forcing wave train and modulating Asian jet Dynamic processes of the atmosphere are more important in regulating the variability of TP precipitation
Editor: Washington: Blackwell Publishing Ltd
Idioma: Inglês

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Atmospheric moisture budget and its regulation on the variability of summer precipitation over the Tibetan Plateau

Wang, Ziqian ; Duan, Anmin ; Yang, Song ; Ullah, Kalim

Washington: Blackwell Publishing Ltd

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