北太平洋中纬度地区海气热输送的季节变化特征

FEATURES OF SEASONAL VARIATION OF AIR－SEA HEAT TRANSFER OVER SEA SURFACE OF MIDLATITUDES IN THE NORTH PACIFIC

资料分析表明．北太平洋中纬度地区海气热输送具有明显的季节变化持征，12月最强．6月最弱．热输送的分布与海流密切有关．暖流区偏强．冷流区偏弱．酉边界上的两支海流（黑潮和亲潮）热输送的季节变化比东边界上的两支海流（阿拉斯加流和加里福尼亚流）更明显．160°E以西、37．5°～42．5°N海面存在看热输送强大的南北梯度，以3月最强．6月基本消失．热收支比也具有明显的季节变化．12月全海域有热量的净支出．6用则反之．热收支分布也与海流密切有关，暖流区较大．冷流区较小．热收支比随纬度的变化．6月与12月有完全相反的趋势．

Based on data. the apparent seasonal variation of air-sea heat transfer over sea surface of mid-latitudes in the North pacific exists. It is strongest in December and weakest in June. The distribution ofair-sea heat transfer is closely related to ocean currents. The heat transfer is stronger over warm currentsand weaker over cold currents. The heat tranfer seasonal variation over Kuroshio and Oyashio along thewestern boundary is more obvious than California current and AlaSka current along the eastern boundary.The strong north-south gradient of heat rtansfer over sea surface obviously exiss at 37.5-42.5°N westof 160°E. It is strongest in March and nearly disappears in June. The ratio of heat output to heat inputover sea surface also bears apparent seasonal variation. The net heat output appears over the whole basinin December and the net heat input in June. The ratio distribution is also closely related to ocean currents.The ratio is bigger over warm currents and smaller over cold currents. The variation of ratio with latitudehas opposite tendency in June and December.