Observations and modeling of the ice-ocean conditions in the coastal Chukchi and Beaufort Seas
Observations and modeling of the ice-ocean conditions in the coastal Chukchi and Beaufort Seas
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发表时间：
2008
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通讯作者：
Jin;Meibing;Wang;Jia;Mizobata;Kohei;Hu;Haoguo;Shimada;Koji
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作者：
Jin;Meibing;Wang;Jia;Mizobata;Kohei;Hu;Haoguo;Shimada;Koji
楚科奇海和博福特海包括几个重要的水文特征：太平洋水的流入，阿拉斯加海岸流（ACC），季节性到常年性冰盖，以及沿着阿拉尔坎海岸的陆固冰。冰-海耦合系统的动力学研究对区域尺度海洋学和大尺度全球气候变化研究都具有重要意义。自1992年以来，JAMSI'EC在该地区部署了一些系泊设备，数据显示水文环境的高度可变特征。建立了楚科奇海和博福特海区域高分辨率冰-海耦合模式，模拟了沿岸博福特海的冰-海环境和独特的季节性快冰。模式结果再现了博福特环流和AC e。沿博福特海海岸和陆架坡折的沿着年平均海流的深度平均值与四个系泊ADCP的数据进行了比较，但模拟的速度具有较小的标准偏差，这表明该地区经常出现小尺度的涡旋。与遥感资料相比，模式模拟结果反映了海冰面积的季节变化，海冰速度沿博福特海岸沿着一个几乎静止的区域，与观测到的陆地固定冰范围相似。正是由于海岸附近的弱洋流、具有向岸成分的盛行风、洋流的反向以及海岸线的阻挡，使得博福特海沿海地区易于形成陆固冰。
The Chukchi and Beaufort Seas include several important hydrological features: inflow of the Pacific water, Alaska coast current (ACC) , the seasonal to perennial ice cover, and landfast ice along the Alal'kan coast. The dynamics of this coupled ice-ocean sys tem is important for both regional scale oceanography and large--scale global climate change research. A number of moorings were de ployed in the area by JAMSI'EC since 1992, and the data revealed highly variable characteristics of the hydrological environment. A re gional high-resolution coupled ice-ocean model of the Chukchi and Beaufort Seas was established to simulate the ice-ocean environment and unique seasonallandfast ice in the coastal Beaufort Sea. The model results reproduced the Beaufort gyre and the ACe. The depth averaged annual mean ocean currents along the Beaufort Sea coast and shelf break compared well with data from four moored ADCPs, but the simulated velocity had smaller standan:l deviations, which indicate small-scale eddies were frequent in the region. The model re sults captured the seasonal variations of sea ice area as compared with remote sensing data, and the simulated sea ice velocity showed an almost stationary area along the Beaufort Sea coast that was similar to the observed landfast ice extent. It is the combined effects of the weak oceanic current near the coast, a prevailing wind with an onshore component, the opposite direction of the ocean current, and the blocking by the coastline that make the Beaufort Sea coastal areas prone to the formation of landfast ice.