气候变化领域集成服务门户(CCPortal): A simplified model of precipitation enhancement over a heterogeneous surface

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DOI	10.5194/hess-22-3197-2018
	A simplified model of precipitation enhancement over a heterogeneous surface
	Cioni G.; Hohenegger C.
发表日期	2018
ISSN	1027-5606
起始页码	3197
结束页码	3212
卷号	22 期号:6
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.
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
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160008
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
推荐引用方式 GB/T 7714	Cioni G.,Hohenegger C.. A simplified model of precipitation enhancement over a heterogeneous surface[J],2018,22(6).
APA	Cioni G.,&Hohenegger C..(2018).A simplified model of precipitation enhancement over a heterogeneous surface.Hydrology and Earth System Sciences,22(6).
MLA	Cioni G.,et al."A simplified model of precipitation enhancement over a heterogeneous surface".Hydrology and Earth System Sciences 22.6(2018).