This report is includes the effect of projected climate change on water
resources. We would like to answer questions such as:"If due to a doubling of carbon
dioxide in the atmosphere the air temperature increases by 4 °C, what will happen
to the water resources, specifically the streams and lakes of a specific region? How
much of the volume of its lakes will be lost? What will happen to the surface runoff
of the region? Will flooding increase or decrease? What will happen to the available
stream flow of a region? Will it decrease or increase and to what extent?
Answers to these questions are related to the hydrologic cycle. Therefore,
looking at the world water budget may give a perspective, Table 1 shows that longterm
global precipitation is equal to global evaporation. Any global temperature
increase will cause more evaporation and consequently more precipitation. What is
important, perhaps is the distribution of precipitation and evaporation. If so, on the
global scale, there is no change, but locally significant changes may occur, e.g. more
rain may fall on oceans, and drier summers may occur over the lands.
To develop answers regarding hydrologic responses to climate change, we will
use the water budget theory to study the dependence of all its variables on.
atmospheric parameters, particularly on air temperature.
National Agricultural Water Quality Laboratory, US Department of Agriculture
Mohseni, Omid; Stefan, Heinz G..
A Methodology to Estimate Climate Effects on Monthly Stream Runoff.
St. Anthony Falls Laboratory.
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