Tropopause analysis over the Iranian region using GPS radio occultation data
| Autor: | Mohammad Ali Sharifi, Torsten Schmidt, Salim Masoumi, Mohammad Taghi Joghataei, Jens Wickert, Ali Sam-Khaniani |
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| Rok vydání: | 2013 |
| Předmět: |
Atmospheric Science
Jet (fluid) business.industry Mesoscale meteorology Aerospace Engineering Astronomy and Astrophysics Total ozone Atmospheric sciences Atmosphere Geophysics Space and Planetary Science Global Positioning System General Earth and Planetary Sciences Environmental science Radio occultation Tropopause business Mixing (physics) |
| Zdroj: | Advances in Space Research |
| Popis: | Near-tropopause phenomena like upper level fronts and cyclones, penetrative cumulus convection and mesoscale mechanisms of exchange make important contributions to the mixing processes in the atmosphere. Spatio-temporal monitoring of the tropopause height, temperature and pressure is an appropriate tool to show the running processes in the atmosphere. In this study, GPS radio occultation data is used to investigate the tropopause height fluctuations and the relation between the stratosphere–troposphere exchange and the aforementioned phenomena over the Iranian region. The paper shows how the position of the sub-tropical jet has changed with time, using GPS radio occultation observations. The tropopause height changes latitudinally, and three different bimodal probability distribution functions are observed. The results also show that the mixing region in the south of Iran is associated with the subtropical jet in winter. However, this region shifts north of Iran due to changes in the position of the subtropical jet during the summer. Consistency of the mixing region from the radio occultation data and the total ozone of TOMS over the Iranian region is also observed. |
| Databáze: | OpenAIRE |
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