Diurnal variability of the global tropical tropopause: results inferred from COSMIC observations
| العنوان: | Diurnal variability of the global tropical tropopause: results inferred from COSMIC observations |
|---|---|
| المؤلفون: | Siddarth Shankar Das, Subrata Kumar Das, K. V. Suneeth |
| المصدر: | Climate Dynamics. 49:3277-3292 |
| بيانات النشر: | Springer Science and Business Media LLC, 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | Convection, Atmospheric Science, 010504 meteorology & atmospheric sciences, Atmospheric tide, Atmospheric sciences, 01 natural sciences, Troposphere, Altitude, Forenoon, Climatology, 0103 physical sciences, Environmental science, Tropopause, 010303 astronomy & astrophysics, Stratosphere, Water vapor, 0105 earth and related environmental sciences |
| الوصف: | 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. |
| تدمد: | 1432-0894 0930-7575 |
| DOI: | 10.1007/s00382-016-3512-x |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::0fd09dd1448193d77cc49d1376c93bc9 https://doi.org/10.1007/s00382-016-3512-x |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi...........0fd09dd1448193d77cc49d1376c93bc9 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14320894 09307575 |
|---|---|
| DOI: | 10.1007/s00382-016-3512-x |