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Diurnal variability of the global tropical tropopause: results inferred from COSMIC observations

Suneeth, K.V and Das, SS and Das, SK (2017) Diurnal variability of the global tropical tropopause: results inferred from COSMIC observations. Climate Dynamics, 49 (9-10). pp. 3277-3292.

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Short and long-term variability of the tropical tropopause controls the exchange of minor constituents between the troposphere and the stratosphere. We present the diurnal variability of the global tropical tropopause altitude and temperature using 7 years of COSMIC observations. The aim of the study is to extract diurnal tropopause signals and their impact on stratosphere-troposphere exchange processes. The possible role of atmospheric tides and convection in controlling the tropopause characteristics are discussed. The most significant and new observation is that in the deep tropics the cold-point tropopause altitude is higher and temperatue is cooler over the land (ocean) during evening to late evening hours (afternoon to early evening). Lower tropopause altitude allows the stratospheric air intrusion into the troposphere during the day time. The combined effect of diurnal tropopause altitude changes and turbulent mixing increases the possibility of stratospheric intrusions. A warmer forenoon tropopause allows increased injection of water vapor from the troposphere to the lower stratosphere. Over the tropical land (ocean), the zonal mean diurnal amplitude is 130–200 m (140–180 m) for tropopause altitude and 0.6–0.9 K (0.6–0.8 K) for tropopause temperature.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer Nature
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 13 Aug 2018 09:09
Last Modified: 13 Aug 2018 09:09

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