DOI: 10.1175/JCLI-D-15-0557.1
Scopus记录号: 2-s2.0-84962226920
论文题名: Scale interactions between the MJO and the western Maritime Continent
作者: Birch C.E. ; Webster S. ; Peatman S.C. ; Parker D.J. ; Matthews A.J. ; Li Y. ; Hassim M.E.E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 7 起始页码: 2471
结束页码: 2492
语种: 英语
Scopus关键词: Climate models
; Heat flux
; Incident solar radiation
; Rain
; Solar radiation
; Cloud resolving model
; Convective-scale process
; Geographic location
; Madden-Julian oscillation
; Maritime Continent
; Sea breeze
; Climatology
; atmospheric circulation
; atmospheric convection
; climate modeling
; land breeze
; Madden-Julian oscillation
; mesoscale meteorology
; rainfall
; sea breeze
英文摘要: State-of-the-art regional climate model simulations that are able to resolve key mesoscale circulations are used, for the first time, to understand the interaction between the large-scale convective environment of the MJO and processes governing the strong diurnal cycle over the islands of the Maritime Continent (MC). Convection is sustained in the late afternoon just inland of the coasts because of sea breeze convergence. Previous work has shown that the variability in MC rainfall associated with the MJO is manifested in changes to this diurnal cycle; land-based rainfall peaks before the active convective envelope of the MJO reaches the MC, whereas oceanic rainfall rates peak while the active envelope resides over the region. The model simulations show that the main controls on oceanic MC rainfall in the early active MJO phases are the large-scale environment and atmospheric stability, followed by high oceanic latent heat flux forced by high near-surface winds in the later active MJO phases. Over land, rainfall peaks before the main convective envelope arrives (in agreement with observations), even though the large-scale convective environment is only moderately favorable for convection. The causes of this early rainfall peak are strong convective triggers from land-sea breeze circulations that result from high surface insolation and surface heating. During the peak MJO phases cloud cover increases and surface insolation decreases, which weakens the strength of the mesoscale circulations and reduces land-based rainfall, even though the large-scale environment remains favorable for convection at this time. Hence, scale interactions are an essential part of the MJO transition across the MC. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49994
Appears in Collections: 气候变化事实与影响
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作者单位: Met Office at Leeds, University of Leeds, Leeds, United Kingdom; School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Met Office, Exeter, United Kingdom; University of Reading, Reading, United Kingdom; Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences and School of Mathematics, University of East Anglia, Norwich, United Kingdom; ARC Centre of Excellence for Climate System Science, Climate Change Research Centre, University of New South Wales, Sydney, NSW, Australia; Centre for Climate Research Singapore, Meteorological Service Singapore, Singapore
Recommended Citation:
Birch C.E.,Webster S.,Peatman S.C.,et al. Scale interactions between the MJO and the western Maritime Continent[J]. Journal of Climate,2016-01-01,29(7)