Thickness and production of sea ice in the Okhotsk Sea coastal polynyas from AMSR‐E
Thickness and production of sea ice in the Okhotsk Sea coastal polynyas from AMSR‐E
复制标题
DOI：
10.1029/2008jc005222
复制
发表时间：
2009-10
影响因子：
--
通讯作者：
S. Nihashi;K. Ohshima;T. Tamura;Y. Fukamachi;S. Saitoh
中科院分区：
文献类型：
--
作者：
S. Nihashi;K. Ohshima;T. Tamura;Y. Fukamachi;S. Saitoh
[1]从海冰的厚度从先进的甚高分辨率辐射计（AVHRR）和冰剖面声纳数据的比较，我们已经开发了一个先进的微波扫描辐射计EOS（AMSR-E）薄冰厚度算法鄂霍次克海。该算法利用36.5GHz通道AMSR-E亮温的偏振比与AVHRR冰厚的线性关系，可在无雪条件下估算≤ 0.2m的冰厚。当薄冰面上存在积雪时，如每年冬季发生的几次，它表明该算法不能检测到薄冰面。利用2002-2003年和2004-2005年3个冬季（12 - 3月）的AMSR-E逐日冰厚资料，通过热通量计算，估算了沿海冰槽的海冰和密集陆架水（DSW）产生量。西北陆架冰穴的产冰量最大，约占沿海主要冰穴产冰量的45%。如果假定平均冰厚为1 m，则主要沿海冰穴的产冰量将覆盖鄂霍次克海的最大冰面积。冰产量的变化主要受气温的调制。在NWS冰间湖，这是主要的DSW生产区，DSW的年形成率估计为10.36 Sv。
[1] From comparisons with thickness of sea ice from Advanced Very High Resolution Radiometer (AVHRR) and ice-profiling sonar data we have developed an Advanced Microwave Scanning Radiometer-EOS (AMSR-E) thin ice thickness algorithm for the Sea of Okhotsk. This algorithm can estimate ice thickness of ≤0.2 m without snow using the polarization ratio of AMSR-E brightness temperature at a 36.5 GHz channel from a linear relationship with AVHRR ice thickness. When a snow cover exists on the thin ice surface, as occurred a few times in each winter, it is shown that the algorithm cannot detect the thin ice. Sea ice and dense shelf water (DSW) production in coastal polynya are estimated on the basis of heat flux calculation with the daily AMSR-E ice thickness for three winters (December–March) of 2002–2003 to 2004–2005. The ice production is largest in the northwest shelf (NWS) polynya which accounts for ∼45% of the sum of ice production in major coastal polynyas. The ice production in major coastal polynyas would cover the maximum ice area of the Okhotsk Sea if the average ice thickness is assumed to be 1 m. Variability of the ice production is mainly modulated by air temperature. In the NWS polynya, which is the main DSW production area, the annual DSW formation rate is estimated to be ∼0.36 Sv.