globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2017JD026632
论文题名:
Physical processes controlling the spatial distributions of relative humidity in the tropical tropopause layer over the Pacific
作者: Jensen E.J.; Thornberry T.D.; Rollins A.W.; Ueyama R.; Pfister L.; Bui T.; Diskin G.S.; DiGangi J.P.; Hintsa E.; Gao R.-S.; Woods S.; Lawson R.P.; Pittman J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期:11
起始页码: 6094
结束页码: 6107
语种: 英语
英文关键词: cirrus ; humidity ; tropopause ; water vapor
英文摘要: The spatial distribution of relative humidity with respect to ice (RHI) in the boreal wintertime tropical tropopause layer (TTL, ≃14–18 km) over the Pacific is examined with the measurements provided by the NASA Airborne Tropical TRopopause EXperiment. We also compare the measured RHI distributions with results from a transport and microphysical model driven by meteorological analysis fields. Notable features in the distribution of RHI versus temperature and longitude include (1) the common occurrence of RHI values near ice saturation over the western Pacific in the lower to middle TTL; (2) low RHI values in the lower TTL over the central and eastern Pacific; (3) common occurrence of RHI values following a constant mixing ratio in the middle to upper TTL (temperatures between 190 and 200 K); (4) RHI values typically near ice saturation in the coldest airmasses sampled; and (5) RHI values typically near 100% across the TTL temperature range in air parcels with ozone mixing ratios less than 50 ppbv. We suggest that the typically saturated air in the lower TTL over the western Pacific is likely driven by a combination of the frequent occurrence of deep convection and the predominance of rising motion in this region. The nearly constant water vapor mixing ratios in the middle to upper TTL likely result from the combination of slow ascent (resulting in long residence times) and wave-driven temperature variability. The numerical simulations generally reproduce the observed RHI distribution features, and sensitivity tests further emphasize the strong influence of convective input and vertical motions on TTL relative humidity. ©2017. American Geophysical Union. All Rights Reserved.
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被引频次[WOS]:19   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62643
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: Atmospheric Science Branch, NASA Ames Research Center, Moffett Field, CA, United States; Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States; Chemistry and Dynamics Branch, NASA Langley research Center, Hampton, VA, United States; Global Monitoring Division, NOAA Earth System Research Laboratory, Boulder, CO, United States; SPEC, Inc, Boulder, CO, United States; Northwest Research Associates, Seattle, WA, United States; School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States

Recommended Citation:
Jensen E.J.,Thornberry T.D.,Rollins A.W.,et al. Physical processes controlling the spatial distributions of relative humidity in the tropical tropopause layer over the Pacific[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(11)
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