Solar radiation is the key driving force for water cycle. It modulates how much water land surface evaporates and plant transpires. The explicitly estimation of radiation is essential for water budget modelling. One of the major factor affect the net surface radiation is the cloud cover. It can affect the net radiation in many ways. The influence of cloud on the land surface energy depends on several factors, such as cloud altitude, it size, the nature of the cloud particles.
Due to the lack of accurate cloud cover information, the net radiation modelling thereby the processes of land-atmosphere interaction is poorly characterised. Some spatial cloud cover data, as given by recent satellite imagery, however, can contribute for better estimation of the basin water budget simulation. For effort in this direction, EUMETSAT Climate Monitoring Satellite Application Facility (CM SAF) cloud cover fraction data can be useful resource. Here I have processed this data for Upper Blue Nile basin to be used in water budget modelling. A sample of the monthly mean could cover map over the basin for the 1994 is shows in figure 1.
The seasonality of the cover can be clearly seen, and this contributes to the reason for governing factors of the seasonality in the basin water budget.
Frank Richards and Phil Arkin
J. A. Griggs and J. L. Bamber
Due to the lack of accurate cloud cover information, the net radiation modelling thereby the processes of land-atmosphere interaction is poorly characterised. Some spatial cloud cover data, as given by recent satellite imagery, however, can contribute for better estimation of the basin water budget simulation. For effort in this direction, EUMETSAT Climate Monitoring Satellite Application Facility (CM SAF) cloud cover fraction data can be useful resource. Here I have processed this data for Upper Blue Nile basin to be used in water budget modelling. A sample of the monthly mean could cover map over the basin for the 1994 is shows in figure 1.
The seasonality of the cover can be clearly seen, and this contributes to the reason for governing factors of the seasonality in the basin water budget.
Some papers on cloud and hydrology
Cawkwell, F. G. L., and J. L. Bamber. "The impact of cloud cover on the net radiation budget of the Greenland ice sheet." Annals of Glaciology 34.1 (2002): 141-149.
Alados, I., et al. "Relationship between net radiation and solar radiation for semi-arid shrub-land." Agricultural and Forest Meteorology 116.3 (2003): 221-227.
to be updated….
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