DOI: 10.5194/hess-22-3197-2018
论文题名: A simplified model of precipitation enhancement over a heterogeneous surface
作者: Cioni G. ; Hohenegger C.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2018
卷: 22, 期: 6 起始页码: 3197
结束页码: 3212
语种: 英语
Scopus关键词: Advection
; Evaporation
; Soil moisture
; Additional experiments
; Conceptual model
; Heterogeneous surface
; Main parameters
; Mesoscale circulation
; Onset of convection
; Precipitation enhancement
; Precipitation variation
; Large eddy simulation
; atmospheric circulation
; atmospheric convection
; diurnal activity
; large eddy simulation
; mesoscale eddy
; model validation
; precipitation (chemistry)
; precipitation (climatology)
; soil moisture
英文摘要: Soil moisture heterogeneities influence the onset of convection and subsequent evolution of precipitating systems through the triggering of mesoscale circulations. However, local evaporation also plays a role in determining precipitation amounts. Here we aim at disentangling the effect of advection and evaporation on precipitation over the course of a diurnal cycle by formulating a simple conceptual model. The derivation of the model is inspired by the results of simulations performed with a high-resolution (250 m) large eddy simulation model over a surface with varying degrees of heterogeneity. A key element of the conceptual model is the representation of precipitation as a weighted sum of advection and evaporation, each weighed by its own efficiency. The model is then used to isolate the main parameters that control precipitation variations over a spatially drier patch. It is found that these changes surprisingly do not depend on soil moisture itself but instead purely on parameters that describe the atmospheric initial state. The likelihood for enhanced precipitation over drier soils is discussed based on these parameters. Additional experiments are used to test the validity of the model. © Author(s) 2018. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163291
Appears in Collections: 气候变化与战略
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作者单位: Cioni, G., Max Planck Institute for Meteorology, Hamburg, Germany, International Max-Planck Research School on Earth System Modelling, Hamburg, Germany, Hans-Ertel-Zentrum for Weather Research, Germany; Hohenegger, C., Max Planck Institute for Meteorology, Hamburg, Germany, Hans-Ertel-Zentrum for Weather Research, Germany
Recommended Citation:
Cioni G.,Hohenegger C.. A simplified model of precipitation enhancement over a heterogeneous surface[J]. Hydrology and Earth System Sciences,2018-01-01,22(6)