DOI: 10.1002/jgrd.50639
论文题名: Characterizing moisture exchange between the Hawaiian convective boundary layer and free troposphere using stable isotopes in water
作者: Bailey A. ; Toohey D. ; Noone D.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 15 起始页码: 8208
结束页码: 8221
语种: 英语
英文关键词: convective boundary layer
; mixing model
; moisture transport
; stable isotope ratios
; transition layer
; water vapor
Scopus关键词: Atmospheric humidity
; Boundary layers
; Commerce
; Isotopes
; Mixing
; Troposphere
; Water vapor
; Convective boundary layers
; Mixing models
; Moisture transport
; Stable isotope ratios
; Transition layers
; Moisture
; air mass
; atmospheric transport
; convective boundary layer
; humidity
; isotopic ratio
; moisture
; moisture transfer
; oxygen isotope
; stable isotope
; thermodynamics
; troposphere
; vertical mixing
; Hawaiian Islands
英文摘要: The subtropical convective boundary layer (CBL) plays a critical role in climate by regulating the vertical exchange of moisture, energy, trace gases, and pollutants between the ocean surface and free troposphere. Yet bulk features of this exchange are poorly constrained in climate models. To improve our understanding of moisture transport between the boundary layer and free troposphere, paired measurements of water vapor mixing ratio and the stable isotope ratio 18O/16O are used to evaluate moist convective mixing and entrainment processes near the Big Island of Hawaii. Profile data from the island's east side are consistent with moist adiabatic processes below the trade wind temperature inversion. In contrast, profiles on the west side follow moist adiabatic lapse rates within discrete stable layers, suggesting moist convection sets the humidity structure of even the unsaturated regions around the island. Above the trade wind inversion, the transition from well-mixed boundary layer to free troposphere is characterized by a simple mixing line analysis, so long as the thermodynamic properties of the air mass at CBL top are known. Deviations from the mixing line identify thermodynamic boundaries in the atmospheric profile, which can persist from one day to the next. These findings indicate residual layers form during strong mixing events and regulate vertical moisture transport for multiple days at a time. Basic assumptions that synoptic-scale transport controls isotope ratios at CBL top are therefore not sufficient for describing moisture exchange between the boundary layer and free troposphere in the subtropics. Key Points Vapor isotope ratio profiles characterize vertical moisture transport on Hawaii Mixing processes describe boundary layer-free troposphere moisture exchange Residual layers shape the thermodynamic characteristics of vertical mixing ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63469
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, UCB 216, Boulder, CO 80309, United States; Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder CO, United States
Recommended Citation:
Bailey A.,Toohey D.,Noone D.. Characterizing moisture exchange between the Hawaiian convective boundary layer and free troposphere using stable isotopes in water[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(15)