原著
実測氷厚データおよび海氷移動速度モデルに基づく北極海氷の季節的成長融解の平年モデル
2003 年 8 巻 2 号 p. 89-98
詳細
2003 年 8 巻 2 号 p. 89-98
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.
