DOI: 10.1029/2018JD028286
Scopus记录号: 2-s2.0-85046496568
论文题名: Convective Hydration of the Upper Troposphere and Lower Stratosphere
作者: Schoeberl M.R. ; Jensen E.J. ; Pfister L. ; Ueyama R. ; Avery M. ; Dessler A.E.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 9 起始页码: 4583
结束页码: 4593
语种: 英语
英文关键词: cirrus
; convection
; stratosphere
Scopus关键词: atmospheric convection
; cirrus
; climate change
; hydration
; ice crystal
; microwave limb sounder
; precipitation (chemistry)
; stratosphere
; stratosphere-troposphere interaction
; supersaturation
; tropopause
; troposphere
英文摘要: We use our forward domain filling trajectory model to explore the impact of tropical convection on stratospheric water vapor (H2O) and tropical tropopause layer cloud fraction (TTLCF). Our model results are compared to winter 2008/2009 TTLCF derived from Cloud-Aerosol Lidar with Orthogonal Polarization and lower stratospheric H2O observations from the Microwave Limb Sounder. Convection alters the in situ water vapor by driving the air toward ice saturation relative humidity. If the air is subsaturated, then convection hydrates the air through the evaporation of ice, but if the air is supersaturated, then convective ice crystals grow and precipitate, dehydrating the air. On average, there are a large number of both hydrating and dehydrating convective events in the upper troposphere, but hydrating events exceed dehydrating events. Explicitly adding convection produces a less than 2% increase in global stratospheric water vapor during the period analyzed here. Tropical tropopause temperature is the primary control of stratospheric water vapor, and unless convection extends above the tropopause, it has little direct impact. Less than 1% of the model parcels encounter convection above the analyzed cold-point tropopause. Convection, on the other hand, has a large impact on TTLCF. The model TTLCF doubles when convection is included, and this sensitivity has implications for the future climate-related changes, given that tropical convective frequency and convective altitudes may change. ©2018. 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/113890
Appears in Collections: 气候减缓与适应
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作者单位: Science and Technology Corporation, Columbia, MD, United States; NASA Ames Research Center, Moffett Field, CA, United States; NASA Langley Research Center, Hampton, VA, United States; Department of Meteorology, Texas A&M University, College Station, TX, United States
Recommended Citation:
Schoeberl M.R.,Jensen E.J.,Pfister L.,et al. Convective Hydration of the Upper Troposphere and Lower Stratosphere[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(9)