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| Title: | Tropical tropopause dynamics (TTD) campaigns over Indian region: An overview |
| Authors: | 山吉拉維卓;Venkat Ratnam, M.;Sunilkumar, S.V.;Parameswaran, K.;Krishna Murthy, B.V.;Ramkumar, Geetha;Rajeev, K.;Basha, Ghouse;Ravindra Babu, S.;Muhsin, M.;Kumar Mishra, Manoj;Hemanth Kumar, A.;Akhil Raj, S.T.;Pramitha, M. |
| Contributors: | 地球科學學院大氣科學學系 |
| Keywords: | Atmospherics;Climate change;Dynamics;India;Indication;Intensive observational campaign;Mie lidar;Monsoons;MST radar;Ozonesonde;Radiosonde;Transistor logic;Tropical tropopause;Tropopause |
| Date: | 2014-12-01 |
| Issue Date: | 2026-04-21 13:58:49 (UTC+8) |
| Publisher: | Elsevier Ltd.;Elsevier Ltd |
| Abstract: | 摘要： It is widely accepted that the tropical tropopause is closely linked to climate change. Several campaigns have already been conducted and also are being planned to address various issues related to the tropical tropopause layer (TTL). Despite many campaigns, several scientific issues still remain unexplained including Indian summer monsoon dynamics, cirrus clouds and the trace gas distribution across the tropopause etc. In order to address some of the issues, particularly over the Indian region, intensive observational campaigns called ‘tropical tropopause dynamics (TTD)’ are being conducted since December 2010 at two stations namely Gadanki (13.5°N, 79.2°E) and Trivandrum (8.5°N, 76.9°E) under CAWSES India Phase-II programme. This overview article aims to bring out the current understanding on the tropical tropopause, issues addressed through the TTD campaigns and the details of the data collected in these campaigns using collocated instruments as well as complementary satellite data. So far 32 campaigns have been completed successfully and in this paper main focus is given for describing the systematic data collected using various techniques (MST radar, Mie lidar, Radiosonde, ozonesonde) simultaneously in each month. In general, over the study region affected by the monsoon, a prominent updraft prevails in the middle and upper troposphere regions covering TTL affecting the transport of minor species across the tropopause. The behavior of the cold point tropopause (CPT) at Gadanki and Trivandrum reveals that there are significant differences in the CPT characteristics even within the monsoon region. Cold point tropopause shows stronger sub-daily scale variation over Trivandrum than Gadanki though no indication of deep convection is present at the former location particularly in winter. •Intensive campaigns on ‘tropical tropopause dynamics’ have been conducted.•Importance of a sustained study on the tropical tropopause is brought out.•Expected to provide important contributions to the international campaigns.
出版者： Elsevier Ltd
出版日期： 2014-12-01
出處： Journal of atmospheric and solar-terrestrial physics, 2014-12, Vol.121, p.229-239
資源來源： ScienceDirect - Freedom Collection
版權： 2014 Elsevier Ltd
識別號： ISSN: 1364-6826
識別號： EISSN: 1879-1824
識別號： DOI: 10.1016/j.jastp.2014.05.007 |
| Appears in Collections: | [Department of Atmospheric Sciences] journal & Dissertation
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