DOI: 10.1038/ngeo2789
论文题名: Intensification of convective extremes driven by cloud-cloud interaction
作者: Moseley C. ; Hohenegger C. ; Berg P. ; Haerter J.O.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 10 起始页码: 748
结束页码: 752
语种: 英语
Scopus关键词: boundary condition
; climate change
; climate modeling
; cloud
; cloud microphysics
; convective cloud
; convective system
; diurnal variation
; large eddy simulation
; precipitation (climatology)
; surface temperature
; thermodynamics
; tracking
英文摘要: In a changing climate, a key role may be played by the response of convective-type cloud and precipitation to temperature changes. Yet, it is unclear if convective precipitation intensities will increase mainly due to thermodynamic or dynamical processes. Here we perform large eddy simulations of convection by imposing a realistic diurnal cycle of surface temperature. We find convective events to gradually self-organize into larger cloud clusters and those events occurring late in the day to produce the highest precipitation intensities. Tracking rain cells throughout their life cycles, we show that events which result from collisions respond strongly to changes in boundary conditions, such as temperature changes. Conversely, events not resulting from collisions remain largely unaffected by the boundary conditions. Increased surface temperature indeed leads to more interaction between events and stronger precipitation extremes. However, comparable intensification occurs when leaving temperature unchanged but simply granting more time for self-organization. These findings imply that the convective field as a whole acquires a memory of past precipitation and inter-cloud dynamics, driving extremes. For global climate model projections, our results suggest that the interaction between convective clouds must be incorporated to simulate convective extremes and the diurnal cycle more realistically. © 2016 Macmillan Publishers Limited, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105919
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: Max Planck Institute for Meteorology, Hamburg, Germany; Hydrology Research Unit, Swedish Meteorological and Hydrological Institute, Norrköping, Sweden; Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark; Departament de Física de la Matèria Condensada, Universitat de Barcelona, Barcelona, Spain
Recommended Citation:
Moseley C.,Hohenegger C.,Berg P.,et al. Intensification of convective extremes driven by cloud-cloud interaction[J]. Nature Geoscience,2016-01-01,9(10)