DOI: 10.1002/2015GL063868
论文题名: Turbulent mixing and its impact on lower tropospheric moisture over tropical ocean
作者: Bellenger H. ; Katsumata M. ; Yoneyama K.
刊名: Geophysical Research Letters
ISSN: 0094-8722
EISSN: 1944-8453
出版年: 2015
卷: 42, 期: 8 起始页码: 3030
结束页码: 3037
语种: 英语
英文关键词: clear air turbulence
; eddy diffusivity
; in situ observations
; low-level moisture
; Thorpe analysis
; tropical ocean
Scopus关键词: Boundary layers
; Budget control
; Climatology
; Diffusion
; Moisture
; Oceanography
; Shock tubes
; Tropics
; Troposphere
; Turbulence
; Turbulent flow
; Clear-air turbulences
; Eddy Diffusivities
; In-situ observations
; Thorpe analysis
; Tropical ocean
; Mixing
; boundary layer
; eddy
; humidity
; tropical region
; troposphere
; turbulent mixing
英文摘要: The variability of lower tropospheric humidity is a crucial feature of the tropical climate. Among the processes that impact moisture budget, the vertical transport by turbulent mixing is generally overlooked. Using observations from Cooperative Indian Ocean experiment on intraseasonal variability/Dynamics of the Madden-Julian Oscillation (MJO), CINDY/DYNAMO, campaign, this is a first attempt to quantify it over the tropical ocean. Turbulent patches of ∼100 m depth are observed in relation with large vertical gradients of specific humidity. Intense mixing is diagnosed within these intermittent patches. Three approaches are used to diagnose the overall effect of this intermittent turbulence. Large uncertainties on the corresponding eddy diffusivity coefficient arise from parameters hard to experimentally constrain. However, dry conditions are associated with steep moisture vertical gradients above the boundary layers. Owing to the uncertainties on the eddy diffusivity, these gradients can correspond to negligible or to significant moisture tendencies (∼0.5-1 g kg-1 d-1) during the recovery following a dry intrusion or the preconditioning stage of an MJO. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84929505334&doi=10.1002%2f2015GL063868&partnerID=40&md5=c6f6efbae6108c72ba47eab65a995280
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8338
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
Recommended Citation:
Bellenger H.,Katsumata M.,Yoneyama K.. Turbulent mixing and its impact on lower tropospheric moisture over tropical ocean[J]. Geophysical Research Letters,2015-01-01,42(8).