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AN ATTEMPT TO ESTIMATE WATER BALANCE COMPONENTS IN PAN-ARCTIC.

DYURGEROV, MARK B  INSTAAR.
Balaeva, Vera  INSTAAR.
Pichugina, Yelena  NOAA.

We estimate the water balance components for two large parts of pan-Arctic basin: (1) continental in N. America and Eurasia where results of river runoff discharge provide reasonable, water balance estimate; (2) Arctic Archipelagos, where the main water balance components are melt-water runoff from glaciers, no river discharge data available for this part. Both parts contribute fresh water to the Arctic Ocean.

In the first part we have chosen 9 largest river basins. Comparison of river runoff results with annual precipitation data provides the residual in the water balance. The residual includes change in the storage, such as thawing of permafrost, dammed artificial lakes, glacier ice and all uncertainties.

For the Arctic archipelagos glaciers are substantial source of fresh water inflow to the ocean. Glaciers constitute 92% of all pan-Arctic glacier-area, more than 300*103 km2 (Greenland ice sheet is not included). Glacier volume change is the part of the permanent storage and thus the main water contributor to the Arctic basin, sea level rise in time of climate warming and glacier-mass wastage.

We show changes in time of major components, precipitation, river runoff and residuals for two parts of pan-Arctic basin.


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