Diurnal variability of lower and middle atmospheric water vapour over the Asian summer monsoon region: first results from COSMIC-1 and TIMED-SABER measurements

First observations on the vertical structure of diurnal variability of water vapour in the lower and middle atmosphere using 13 years of COSMIC-1 and 18 years of SABER observations over the Asian summer monsoon region are presented in this paper. The most significant and new observation is that the...

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Bibliographic Details
Published in:Climate dynamics 2022-12, Vol.59 (11-12), p.3519-3533
Main Authors: Das, Siddarth Shankar, Uma, K. N., Suneeth, K. V., Veenus, V.
Format: Article
Language:English
Subjects:
Amplitude
Amplitudes
Analysis
Atmosphere
Atmospheric water
Atmospheric water vapor
Climate change
Climatology
Clouds
Diurnal
Diurnal cycles (Earth sciences)
Earth and Environmental Science
Earth Sciences
Environmental aspects
Geophysics/Geodesy
Greenhouse gases
Ionosphere
Middle atmosphere
Monsoons
Observations
Oceanography
Oxidation
Radiation
Stratosphere
Summer
Summer monsoon
Tropical tropopause
Tropopause
Variability
Vertical profiles
Water vapor
Water vapour
Wind
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Summary:First observations on the vertical structure of diurnal variability of water vapour in the lower and middle atmosphere using 13 years of COSMIC-1 and 18 years of SABER observations over the Asian summer monsoon region are presented in this paper. The most significant and new observation is that the middle stratospheric water vapour (SWV) enhancement is observed between 9 and 18 LT, whereas it is between 6 and 15 LT near tropopause in all the seasons. The diurnal amplitude of water vapour near tropopause is between 0.3 and 0.4 ppmv. Bimodal peaks are found in the diurnal amplitude of SWV, maximizing between 25 and 30 km (~ 0.4 ppmv), and between 45 and 50 km (~ 0.6 ppmv). The analysis reveals that the diurnal variability in the lower SWV is controlled by the tropical tropopause temperature, whereas the middle and upper SWV is primarily controlled by methane oxidation. The results are presented and discussed in the light of present understanding.
ISSN:0930-7575
1432-0894
DOI:10.1007/s00382-022-06282-5