Effect of tropical cyclones on the tropical tropopause parameters observed using COSMIC GPS RO data

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Title:	Effect of tropical cyclones on the tropical tropopause parameters observed using COSMIC GPS RO data
Authors:	山吉拉維卓;Ravindra Babu, S.;Venkat Ratnam, M.;Basha, G.;Krishnamurthy, B. V.;Venkateswararao, B.
Contributors:	地球科學學院大氣科學學系
Keywords:	Altitude;Arabian Sea;Atmospheric ozone;Bay of Bengal;Climatological means;Cold;Composite structures;Cyclones;Distance;Global Positioning System;Global positioning systems;GPS;Hurricanes;Lower stratosphere;Middle atmosphere;Outflow;Ozone;Parameter modification;Parameters;Positioning systems;Profiles;Radio occultation;Satellite navigation systems;Satellites;Stratosphere;Studies;Temperature;Thermal structure;Thickness;Transistor logic;Tropical climate;Tropical cyclones;Tropical tropopause;Tropopause;Troposphere;Tropospheric ozone;Upper troposphere;Water vapor;Water vapour;Wind
Date:	2015-09-16
Issue Date:	2026-04-21 14:07:16 (UTC+8)
Publisher:	European Geosciences Union;Katlenburg-Lindau: Copernicus GmbH
Abstract:	摘要： Abstract. Tropical cyclones (TCs) are deep convective synoptic-scale systems that play an important role in modifying the thermal structure, tropical tropopause parameters and hence also modify stratosphere–troposphere exchange (STE) processes. In the present study, high vertical resolution and high accuracy measurements from COSMIC Global Positioning System (GPS) radio occultation (RO) measurements are used to investigate and quantify the effect of tropical cyclones that occurred over Bay of Bengal and Arabian Sea in the last decade on the tropical tropopause parameters. The tropopause parameters include cold-point tropopause altitude (CPH) and temperature (CPT), lapse-rate tropopause altitude (LRH) and temperature (LRT) and the thickness of the tropical tropopause layer (TTL), that is defined as the layer between convective outflow level (COH) and CPH, obtained from GPS RO data. From all the TC events, we generate the mean cyclone-centred composite structure for the tropopause parameters and removed it from the climatological mean obtained from averaging the GPS RO data from 2002 to 2013. Since the TCs include eye, eye walls and deep convective bands, we obtained the tropopause parameters based on radial distance from the cyclone eye. In general, decrease in the CPH in the eye is noticed as expected. However, as the distance from the cyclone eye increases by 300, 400, and 500 km, an enhancement in CPH (CPT) and LRH (LRT) is observed. Lowering of CPH (0.6 km) and LRH (0.4 km) values with coldest CPT and LRT (2–3 K) within a 500 km radius of the TC centre is noticed. Higher (2 km) COH leading to the lowering of TTL thickness (2–3 km) is clearly observed. There are multiple tropopause structures in the profiles of temperature obtained within 100 km from the centre of the TC. These changes in the tropopause parameters are expected to influence the water vapour transport from the troposphere to the lower stratosphere, and ozone from the lower stratosphere to the upper troposphere, hence influencing STE processes. 出版者： Katlenburg-Lindau: Copernicus GmbH 出版日期： 2015-09-16 出處： Atmospheric Chemistry and Physics, 2015-09, Vol.15 (18), p.10239-10249 資源來源： Agricultural & Environmental Science Collection 版權： COPYRIGHT 2015 Copernicus GmbH 版權： Copyright Copernicus GmbH 2015 版權： 2015. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. 識別號： ISSN: 1680-7324 識別號： ISSN: 1680-7316 識別號： EISSN: 1680-7324 識別號： DOI: 10.5194/acp-15-10239-2015
Appears in Collections:	[Department of Atmospheric Sciences] journal & Dissertation

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