GSTDTAP  > 地球科学
DOI10.5194/acp-19-11803-2019
Convective hydration in the tropical tropopause layer during the StratoClim aircraft campaign: pathway of an observed hydration patch
Lee, Keun-Ok1; Dauhut, Thibaut1; Chaboureau, Jean-Pierre1; Khaykin, Sergey2; Kraemer, Martina3,4; Rolf, Christian3
2019-09-24
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2019
卷号19期号:18页码:11803-11820
文章类型Article
语种英语
国家France; Germany
英文摘要

The source and pathway of the hydration patch in the TTL (tropical tropopause layer) that was measured during the Stratospheric and upper tropospheric processes for better climate predictions (StratoClim) field campaign during the Asian summer monsoon in 2017 and its connection to convective overshoots are investigated. During flight no. 7, two remarkable layers are measured in the TTL, namely (1) the moist layer (ML) with a water vapour content of 4.8-5.7 ppmv in altitudes of 18-19 km in the lower stratosphere and (2) the ice layer (IL) with ice content up to 1.9 eq. ppmv (equivalent parts per million by volume) in altitudes of 17-18 km in the upper troposphere at around 06:30 UTC on 8 August to the south of Kathmandu (Nepal). A Meso-NH convection-permitting simulation succeeds in reproducing the characteristics of the ML and IL. Through analysis, we show that the ML and IL are generated by convective overshoots that occurred over the Sichuan Basin about 1.5 d before. Overshooting clouds develop at altitudes up to 19 km, hydrating the lower stratosphere of up to 20 km with 6401 t of water vapour by a strong-to-moderate mixing of the updraughts with the stratospheric air. A few hours after the initial overshooting phase, a hydration patch is generated, and a large amount of water vapour (above 18 ppmv) remains at even higher altitudes up to 20.5 km while the anvil cloud top descends to 18.5 km. At the same time, a great part of the hydrometeors falls shortly, and the water vapour concentration in the ML and IL decreases due to turbulent diffusion by mixing with the tropospheric air, ice nucleation, and water vapour deposition. As the hydration patch continues to travel toward the south of Kathmandu, tropospheric tracer concentration increases up to similar to 30 % and 70 % in the ML and IL, respectively. The air mass in the layers becomes gradually diffused, and it has less and less water vapour and ice content by mixing with the dry tropospheric air.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000487995000002
WOS关键词WATER-VAPOR MEASUREMENTS ; ASIAN SUMMER MONSOON ; LOWER STRATOSPHERE ; SEASONAL-VARIATION ; TRANSPORT ; MODEL ; SIMULATIONS ; ANTICYCLONE ; HEMISPHERE ; TURBULENCE
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/187130
专题地球科学
作者单位1.Univ Toulouse, CNRS, UPS, Lab Aerol, Toulouse, France;
2.Sorbonne Univ, CNRS, UVSQ, LATMOS IPSL, Guyancourt, France;
3.Forschungszentrum Julich, Inst Energy & Climate Res Stratosphere IEK 7, Julich, Germany;
4.Johannes Gutenberg Univ Mainz, Inst Atmospher Phys, Mainz, Germany
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GB/T 7714
Lee, Keun-Ok,Dauhut, Thibaut,Chaboureau, Jean-Pierre,et al. Convective hydration in the tropical tropopause layer during the StratoClim aircraft campaign: pathway of an observed hydration patch[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019,19(18):11803-11820.
APA Lee, Keun-Ok,Dauhut, Thibaut,Chaboureau, Jean-Pierre,Khaykin, Sergey,Kraemer, Martina,&Rolf, Christian.(2019).Convective hydration in the tropical tropopause layer during the StratoClim aircraft campaign: pathway of an observed hydration patch.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(18),11803-11820.
MLA Lee, Keun-Ok,et al."Convective hydration in the tropical tropopause layer during the StratoClim aircraft campaign: pathway of an observed hydration patch".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.18(2019):11803-11820.
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