气候变化领域集成服务门户(CCPortal): Effect of deep convection on the tropical tropopause layer composition over the southwest Indian Ocean during austral summer

CCPortal

DOI	10.5194/acp-20-10565-2020
	Effect of deep convection on the tropical tropopause layer composition over the southwest Indian Ocean during austral summer
	Evan S.; Brioude J.; Rosenlof K.; Davis S.M.; Vömel H.; Héron D.; Posny F.; Metzger J.-M.; Duflot V.; Payen G.; Veremes H.; Keckhut P.; Cammas J.-P.
发表日期	2020
ISSN	1680-7316
起始页码	10565
结束页码	10586
卷号	20 期号:17
英文摘要	Balloon-borne measurements of cryogenic frost-point hygrometer (CFH) water vapor, ozone and temperature and water vapor lidar measurements from the Maïdo Observatory on Réunion Island in the southwest Indian Ocean (SWIO) were used to study tropical cyclones' influence ontropical tropopause layer (TTL) composition. The balloon launches were specifically planned using aLagrangian model and Meteosat-7 infrared images to sample the convective outflow from tropical storm (TS) Corentin on 25 January 2016 and tropical cyclone (TC) Enawo on 3 March 2017. Comparing the CFH profile to Aura's Microwave Limb Sounder's (MLS) monthly climatologies, watervapor anomalies were identified. Positive anomalies of water vapor and temperature, and negative anomalies of ozone between 12 and 15km in altitude (247 to 121hPa), originated from convectively active regions of TS Corentin and TC Enawo 1d before the planned balloon launches according to the Lagrangian trajectories. Near the tropopause region, air masses on 25 January 2016 were anomalously dry around 100hPa and were traced back to TS Corentin's active convective region where cirrus clouds and deep convective clouds may have dried the layer. An anomalously wet layer around 68hPa was traced back to the southeast Indian Ocean where a monthly water vapor anomaly of 0.5ppmv was observed. In contrast, no water vapor anomaly was found near or above the tropopause region on 3 March 2017 over Maïdo as the tropopause region was not downwind of TC Enawo. This study compares and contrasts the impact of two tropical cyclones on the humidification of the TTL over the SWIO. It also demonstrates the need for accurate balloon-borne measurements of water vapor, ozone and aerosols in regions where TTL in situ observations are sparse. © 2020 Author(s).
语种	英语
scopus关键词	aerosol; air mass; air temperature; atmospheric convection; balloon observation; Meteosat; ozone; summer; tropical cyclone; tropopause; water vapor; Indian Ocean; Indian Ocean (Southwest)
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141109
作者单位	LACy, Laboratoire de l'Atmosphère et des Cyclones, UMR8105 (CNRS, Université de la Réunion, Météo-France), Saint-Denis de la Réunion, 97490, France; Chemical Sciences Laboratory, Earth System Research Laboratory, NOAA, Boulder, CO 80305, United States; National Center for Atmospheric Research, Boulder, CO 80301, United States; Observatoire des Sciences de l'Univers de la Réunion, UMS3365 (CNRS, Université de la Réunion, Météo-France), Saint-Denis de la Réunion, 97490, France; LATMOS, Laboratoire ATmosphères, Milieux, Observations Spatiales-IPSL UMR8190, UVSQ Université Paris-Saclay, Sorbonne Université, CNRS, Guyancourt, 78280, France
推荐引用方式 GB/T 7714	Evan S.,Brioude J.,Rosenlof K.,et al. Effect of deep convection on the tropical tropopause layer composition over the southwest Indian Ocean during austral summer[J],2020,20(17).
APA	Evan S..,Brioude J..,Rosenlof K..,Davis S.M..,Vömel H..,...&Cammas J.-P..(2020).Effect of deep convection on the tropical tropopause layer composition over the southwest Indian Ocean during austral summer.Atmospheric Chemistry and Physics,20(17).
MLA	Evan S.,et al."Effect of deep convection on the tropical tropopause layer composition over the southwest Indian Ocean during austral summer".Atmospheric Chemistry and Physics 20.17(2020).