Spatial And Temporal Variabilty Of Precipitable Water Vapor From Era-interim Over Ethiopia During 2006-2012

Signals from the Global Positioning System (GPS) are used to retrieve thernintegrated amount of water vapor along the path between a transmitting satelliternand a receiving station. This integrated quantity is called slant water vapor (SW).rnMeasurements of SW allow for an improved assessment of the spatial distributionrnof water vapor within the atmosphere. A study of 7 years (2006-2012) Precip-rnitable water vapour contents (PWVCs) from European Centre for Medium-RangernWeather Forecasts (ECMWF) data have been used over the region (3 À€€ 150N,rn32 ð€€€ 480E) of Ethiopia for a particular time interval of 00:00, 06:00, 12:00 andrn18:00 UTC has been carried out. The time series of PWV and its deviation fromrnannual mean also brought out for all the years. Both dry and moist years in bothrnmonsoon and post monsoon season shows almost increasing trend of PWV for allrnthe years. There exists a well de ned seasonal variation in precipitable water vaporrncontent with maximum during monsoon months (June-September) and minimumrnduring the month of March. Variability in PWVC is higher during post-monsoonrnand winter months (October to February) and smaller during pre-monsoon andrnmonsoon months (March to September). It indicates that local modi cation ofrnweather systems either sea bridge or entrainment of dry or moist air also play anrnimportant role in rainfall

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