Seasonal, interannual and long-term variabilities and tendencies of water vapour in the upper stratosphere and mesospheric region over tropics (30°N-30°S)

Tropical water vapour volume mixing ratio (WVMR) data for October 2004–September 2015 obtained from the Microwave Limb Sounder are used to study its long-term variabilities and tendencies in the height region 12.1–0.002 hPa. Above 0.01 hPa, the WVMR shows minimum March–May and September–November (∼0...

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Bibliographic Details
Published in:Journal of atmospheric and solar-terrestrial physics 2018-01, Vol.167, p.23-29
Main Authors: Nath, Oindrila, Sridharan, S., Naidu, C.V.
Format: Article
Language:English
Subjects:
Annual and semi-annual oscillations
Solar cycle
Trend
Water vapour
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Summary:Tropical water vapour volume mixing ratio (WVMR) data for October 2004–September 2015 obtained from the Microwave Limb Sounder are used to study its long-term variabilities and tendencies in the height region 12.1–0.002 hPa. Above 0.01 hPa, the WVMR shows minimum March–May and September–November (∼0.7–0.8 ppmv) and maximum during June–August. It shows a large interannual variability at 31–64 km. The results from multivariate regression analysis show an increasing trend with maximum value of ∼0.045 ppmv/yr at 1.21–0.41 hPa. It shows a significant negative solar cycle response at mesospheric heights. •Studied long-term variabilities of equatorial middle atmospheric water vapour.•Water vapour mixing ratio (WVMR) shows increasing trend at all heights.•The response of water vapour to Lyman α radiation is negative in mesosphere.•WVMR shows seasonal and interannual variabilities.
ISSN:1364-6826
1879-1824
DOI:10.1016/j.jastp.2017.07.009