Observations and model calculations of aerodynamic drag on sea ice in the Fram Strait
Observations and model calculations of aerodynamic drag on sea ice in the Fram Strait
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DOI：
10.3402/tellusa.v40i2.11789
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发表时间：
1988-03
期刊：
影响因子：
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通讯作者：
I. Hanssen‐Bauer;Y. Gjessing
中科院分区：
文献类型：
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作者：
I. Hanssen‐Bauer;Y. Gjessing
利用系绳探测仪测得的恒流层风场和温度廓线，计算了弗拉姆海峡(79°20‘N，1−3°W)60%浮冰面积上的总气动阻力。边界层高度在150m以上表现为绝热，只有很小的气/水温差。在距地面10m处，阻力系数分别为4.9和5.1×10-3。使用浮冰上局部恒定通量层中的涡旋相关测量来估计100%冰盖区域的皮肤阻力。这还不到实际区域总阻力的40%。相应的阻力系数为1.4×10-3。提出了一个阻力分配模型，用于计算覆盖冰面积上的总阻力作为冰浓度、浮冰的平均干舷和长度以及冰和海面的典型粗糙度长度的函数。该模型预测，在弗拉姆海峡观察到的浮冰类型的最大形式阻力为73%的冰浓度。DOI：10.1111/j.1600-0870.1988.tb00413.x
Wind and temperature profiles in the constant flux layer obtained by tethersonde were used to compute the total aerodynamic drag on an area of 60% pack ice in the Fram Strait (79°20′N, 1−3°W). The boundary layer appeared adiabatic to heights greater than 150 m, and there were only minor air/water temperature differences. Drag coefficients of 4.9 and 5.1 × 10 -3 referred to 10 m above ground level were found. Eddy correlation measurements in the local constant flux layers over ice floes were used to estimate the skin drag of an area of 100% ice cover. This was less than 40% of the total drag on the actual area. The corresponding drag coefficient was 1.4×10 -3 . A drag partition model is proposed for computing the total drag over an area of pack ice as a function of ice concentration, mean freeboard and length of the ice floes, and typical roughness lengths of ice and sea surfaces. The model predicts maximum form drag at 73% ice concentration for floes of the type observed in the Fram Strait. DOI: 10.1111/j.1600-0870.1988.tb00413.x