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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Area balance of the Arctic Ocean perennial ice zone: October 1996 to April 1997
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Area balance of the Arctic Ocean perennial ice zone: October 1996 to April 1997

机译：北冰洋常年冰区的面积平衡：1996年10月至1997年4月

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摘要

We use National Aeronautics and Space Administration scatterometer (NSCAT), RADARSAT, and ice motion data to examine the perennial ice zone (PIZ) of the Arctic Ocean between October 1996 and April 1997. The PIZ is identified by a simple backscatter-based classification of the gridded NSCAT backscatter fields. The area of the PIZ at the beginning of October occupies an area of 5.32 * 10~6 km~2, approx 76% of the Arctic Ocean. By the first of May, only 4.54 * 10~6 km~2 of that area remains, a decrease of 0.78 * 10~6 km~2 over the 7-month period. This area loss can be explained almost entirely by ice export. Over this period the total area flux of sea ice through Fram Strait, estimated using satellite passive microwave ice motion, is 0.80 * 10~6 km~2 or 12% of the Arctic Ocean. Approximately 0.70 * 10~6 km~2 or 88% of the exported area is from the PIZ. Nares Strait outflow is small at 34, 000 km~2 and is estimated by summing the high backscatter areas exported into northern Baffin Bay. After accounting for the outflow through the Fram and Nares Straits an unexplained residual of 46, 00 km~2 remains. We attribute this residual to errors in our estimation process, the unaccounted for ice flux through the Canadian Archipelago, and the net divergence and convergence of the PIZ over the period. Our interpretation of the radiometry seems to be sound on the basis of the area balance arguments provided here. This study shows that (1) the PIZ converage of the Arctic Ocean can be derived from NSCAT backscatter fields and (2) the decrease in PIZ area over the winter is a good estimate of the PIZ net ice area exported through Fram Strait.
机译：我们使用美国国家航空航天局散射计（NSCAT），RADARSAT和冰运动数据来检查1996年10月至1997年4月之间北冰洋的多年生冰区（PIZ）。PIZ通过简单的基于后向散射的分类来确定网格化的NSCAT反向散射字段。 10月初PIZ的面积为5.32 * 10〜6 km〜2，约占北冰洋的76％。到5月1日，该区域仅剩4.54 * 10〜6 km〜2，在7个月期间减少了0.78 * 10〜6 km〜2。面积损失几乎可以完全由冰出口来解释。在此期间，通过卫星被动微波冰运动估算的通过Fram海峡的海冰总通量为0.80 * 10〜6 km〜2或北冰洋的12％。 PIZ约占出口面积的0.70 * 10〜6 km〜2或88％。纳雷斯海峡的流出量很小，为34，000 km〜2，是通过对出口到巴芬湾北部的高后向散射区域求和来估算的。考虑到流经Fram和Nares海峡的流出量后，有46个未解释的残差，即00 km〜2。我们将此残差归因于估算过程中的误差，无法通过加拿大群岛的冰通量以及该期间PIZ的净差异和收敛。根据此处提供的面积平衡论点，我们对放射线学的解释似乎是正确的。这项研究表明，（1）北冰洋的PIZ汇聚可以来自NSCAT背向散射场，（2）冬季PIZ面积的减少是对通过Fram海峡出口的PIZ净冰面积的良好估计。

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