Abstract
This study was performed to analyze the variation level of tropopause height in vertical resolution using radio occultation (RO) data from GRACE database due to the high spatial resolution of radio occultation data. The analysis was conducted for data collected in the year of 2016 and latitudinal variation of study in a range of 30° S to 30° N for an equatorial region with an interval of 5°. The CPT and LRT technique is used in this analysis to identify the tropopause height due to well performance in the previous study. The analysis shows that the tropopause height location varies in the latitude of an equatorial region with the highest level reach up to 19.1 km and the lowest is 16.4km over the year of 2016. Therefore, from the analysis that shows the correlation of highest tropopause layer at near of equatorial plane for northern hemisphere while lower tropopause layer at southern hemisphere.
Highlights
The tropopause height is one of the significant key elements in climate change research due to the correlation between global warming phenomena and the variation of tropopause height level
The GRACE Radio Occultation (RO) data will use in this analysis that was provided by Postdam from the GRACE mission
The tropopause level at 5° in the southern hemisphere which is near to equatorial plane has the lowest tropopause distance is because the location of data taken by GPS-radio occultation (RO) is at the unpopulated area or an ocean with lower water vapor concentration in this area
Summary
The tropopause height is one of the significant key elements in climate change research due to the correlation between global warming phenomena and the variation of tropopause height level. The location of tropopause in atmosphere layer was varying due to the global temperature variation related to human activities. While the LRT called thermal tropopause from global distributed vertical profiles, which the tropopause height is the lowest level that the lapse rate is less than 2K/km for a depth of at least 2km [8, 9]. This method was not suitable to use for a subtropical and polar region that presence double tropopause [9]. The understanding of the tropopause trending is very important in climate change study especially to understand the tropical cyclone activity in future study
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