DOI: 10.1038/ngeo2961
论文题名: Large anomalies in lower stratospheric water vapour and ice during the 2015-2016 El Ninõ
作者: Avery M.A. ; Davis S.M. ; Rosenlof K.H. ; Ye H. ; Dessler A.E.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 6 起始页码: 405
结束页码: 409
语种: 英语
Scopus关键词: cirrus
; climate change
; convective cloud
; dehydration
; El Nino
; ice cover
; perturbation
; stratosphere
; sublimation
; tropopause
; water vapor
; Pacific Ocean
; Pacific Ocean (Central)
; Pacific Ocean (West)
英文摘要: The strong and unusual El Ninõ of 2015-2016 produced a remarkable perturbation to the hydrologic budget of the tropical tropopause layer (14-19 km). This region regulates stratospheric water vapour, which has a direct radiative impact on surface temperatures. To first order, the coldest tropical tropopause temperature regulates the amount of water vapour entering the stratosphere by controlling the amount of dehydration in the rising air. Here we show that tropical convective cloud ice and associated cirrus sublimating at unusually high altitudes might also have a role in stratospheric hydration. The 2015-2016 El Ninõ produced decadal record water vapour amounts in the tropical Western Pacific, coincident with warm tropopause temperature anomalies. In the Central Pacific, convective cloud ice was observed 2 km above the anomalously cold tropopause. A trajectory-based dehydration model based on two reanalysis temperature and wind fields can account for only about 0.5-0.6 ppmv of the ∼0.9 ppmv tropical lower stratospheric moistening observed during this event. This suggests that unresolved convective dynamics and/or associated sublimation of lofted ice particles also contributed to lower stratospheric moistening. These observations suggest that convective moistening could contribute to future climate change-induced stratospheric water vapour increases. © 2017 Macmillan Publishers Limited, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105766
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: NASA Langley Research Center, Hampton, VA, United States; NOAA, Earth System Research Laboratory (ESRL), Boulder, CO, United States; Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado at Boulder, Boulder, CO, United States; Texas AandM University, College Station, TX, United States
Recommended Citation:
Avery M.A.,Davis S.M.,Rosenlof K.H.,et al. Large anomalies in lower stratospheric water vapour and ice during the 2015-2016 El Ninõ[J]. Nature Geoscience,2017-01-01,10(6)