Tuesday, 11 February 2003
Water balance computations of seasonal changes in terrestrial water storage for major Eurasian river basins
Seasonal variations in terrestrial water storage can be computed with the
water-balance method using three main variables: the water vapour
flux convergence, the precipitable water content, and river runoff. The two
first variables are available with high resolution and good accuracy
in present reanalysis data, and river runoff is commonly measured in most parts
of the world. A case study for the Mississippi river basin shows
that this method can provide reliable estimates of monthly changes in
terrestrial water storage (see paper J3.18).
Here we present computed estimates of seasonal changes in terrestrial water
storage for various major river basins in Europe and Asia. The employed data
include ERA-40 reanalysis data from the European Centre for Medium-Range Weather
Forecasts (atmospheric water vapour flux and precipitable water content) and
conventional runoff measurements. When available, comparisons with soil moisture
measurements are presented.