Ayalew, Eliase (2013) Spatial and Temporal Variability of Precipitable Water Vapor from Era-Interim Over Ethiopia During 2006-2012. Masters thesis, Addis Ababa University.
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PDF (Spatial and Temporal Variability of Precipitable Water Vapor from Era-Interim over Ethiopia During 2006-2012)
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Abstract
Signals from the Global Positioning System (GPS) are used to retrieve the integrated amount of water vapor along the path between a transmitting satellite and a receiving station. This integrated quantity is called slant water vapor (SW). Measurements of SW allow for an improved assessment of the spatial distribution of water vapor within the atmosphere. A study of 7 years (2006-2012) Precipitable water vapour contents (PWVCs) from European Centre for Medium-Range Weather Forecasts (ECMWF) data have been used over the region (3 − 150N, 32 − 480E) of Ethiopia for a particular time interval of 00:00, 06:00, 12:00 and 18:00 UTC has been carried out. The time series of PWV and its deviation from annual mean also brought out for all the years. Both dry and moist years in both monsoon and post monsoon season shows almost increasing trend of PWV for all the years. There exists a well defined seasonal variation in precipitable water vapor content with maximum during monsoon months (June-September) and minimum during the month of March. Variability in PWVC is higher during post-monsoon and winter months (October to February) and smaller during pre-monsoon and monsoon months (March to September). It indicates that local modification of weather systems either sea bridge or entrainment of dry or moist air also play an important role in rainfall.
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > Q Science (General) Q Science > QC Physics |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 29 Jun 2018 09:42 |
| Last Modified: | 29 Jun 2018 09:42 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/6084 |
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