DOI: 10.1002/grl.50347
论文题名: The role of moist convection in the West African monsoon system: Insights from continental-scale convection-permitting simulations
作者: Marsham J.H. ; Dixon N.S. ; Garcia-Carreras L. ; Lister G.M.S. ; Parker D.J. ; Knippertz P. ; Birch C.E.
刊名: Geophysical Research Letters
ISSN: 0094-9123
EISSN: 1944-8854
出版年: 2013
卷: 40, 期: 9 起始页码: 1843
结束页码: 1849
语种: 英语
英文关键词: cold-pool outflows
; Explicit and parameterized convection
; Moist convection
; West African monsoon
Scopus关键词: Boundary layer convection
; cold-pool outflows
; Moist convection
; Parameterized
; Radiative heating
; Rainfall intensity
; Weather and climate models
; West African Monsoon
; Parameterization
; Storms
; Atmospheric thermodynamics
; atmospheric convection
; boundary layer
; climate modeling
; climate prediction
; diurnal variation
; heating
; moisture transfer
; monsoon
; outflow
; parameterization
; pressure gradient
; rainfall
; storm
; West Africa
英文摘要: Predicting the West African monsoon (WAM) remains a major challenge for weather and climate models. We compare multiday continental-scale simulations of the WAM that explicitly resolve moist convection with simulations which parameterize convection. Simulations with the same grid spacing but differing representations of convection isolate the impact of the representation of convection. The more realistic explicit convection gives greater latent and radiative heating farther north, with latent heating later in the day. This weakens the Sahel-Sahara pressure gradient and the monsoon flow, delaying its diurnal cycle and changing interactions between the monsoon and boundary layer convection. In explicit runs, cold storm outflows provide a significant component of the monsoon flux. In an operational global model, biases resemble those in our parameterized case. Improved parameterizations of convection that better capture storm structures, their diurnal cycle, and rainfall intensities will therefore substantially improve predictions of the WAM and coupled aspects of the Earth system. Key PointsSimulations of West African Monsoon with explicit and parameterized convectionMore realistic explicit convection weakens monsoon and delays diurnal cycleCold storm outflows are a significant component of the monsoon in explicit runs ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84877992054&doi=10.1002%2fgrl.50347&partnerID=40&md5=38dcaacdc49c00da8ffcea5e267a889b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6387
Appears in Collections: 气候减缓与适应
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作者单位: National Centre for Atmospheric Science, United Kingdom
Recommended Citation:
Marsham J.H.,Dixon N.S.,Garcia-Carreras L.,et al. The role of moist convection in the West African monsoon system: Insights from continental-scale convection-permitting simulations[J]. Geophysical Research Letters,2013-01-01,40(9).