The net sea-ice formation rate in the Arctic Ocean was estimated from actual observations of
sea-ice thickness by Romanov and sea-ice velocity by the International Arctic Buoy Program
(IABP). The net annual sea-ice melting is largest in the Fram Strait. However, the net annual
sea-ice formation is larger to the north of Beaufort Gyre (Canadian Gyre); the north coast of
Greenland; and north to the New Siberian Islands, East Siberian Sea. Sea-ice is formed over the
entire Arctic Ocean in winter-time, but the formation rate is higher in the east Kara Sea, East
Siberian Sea, Beaufort Gyre, north Chukchi Sea, and north to Barrow. Higher seasonal variabil
ity in the ice-formation rate, especially in marginal seas, is attributed to the effect of runoff
from rivers, i.e, the river runoff stays in the marginal seas for some years till it comes out of
the Arctic Ocean, flowing eastward and repeating cycles of freezing and melting. This analysis
also enables us to detect terrigenous ice that has its origin in the ice sheet, e.g., the Greenland
ice sheet, and to estimate the melting process, unlike in modeling.
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