根据鄂霍次克海春季水文地理学估算的海冰融化量:空间和年际变异性

IF 1.3 4区 地球科学 Q4 OCEANOGRAPHY
Mariko Honda, Kay I. Ohshima, Vigan Mensah, Jun Nishioka, Masatoshi Sato, Stephen C. Riser
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引用次数: 0

摘要

这项研究首次根据近百年来积累的春季水文数据对鄂霍次克海的海冰融化量进行了估算。海冰完全融化后,海洋表面会出现一个低盐度层,覆盖在冰点冬水层之上。冬水层盐度下降的总和应与冰融化总量相对应。我们开发了一种算法,从所有可用数据中提取能清晰显示盐度亏损的剖面,并将盐度亏损转换为融冰量。气候图显示,冰融化量向冰缘方向递减,在萨哈林岛北部周围呈现较大数值,反映了冰厚度分布。在南部地区(北纬 48 度以南),海冰从北部运来,据估计,平均融冰量约为 71 厘米厚。研究清楚地表明,自 20 世纪 90 年代以来,南部地区的融冰量减少了约 30%。这些变化可能会通过海冰潜热的减少影响区域气候,也可能会通过冰融化减少导致的分层减弱影响生物生产。我们还发现,在 20 世纪 30 年代至 70 年代期间,融冰量并未显示出明显的趋势,这意味着我们的方法可以提取卫星观测时代之前的海冰信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Sea ice-melt amount estimated from spring hydrography in the Sea of Okhotsk: spatial and interannual variabilities

Sea ice-melt amount estimated from spring hydrography in the Sea of Okhotsk: spatial and interannual variabilities

This study provides the first estimation of sea ice-melt amount in the Sea of Okhotsk based on spring hydrographic data accumulated for nearly a hundred years. Just after sea ice melts completely, a low-salinity layer appears on the ocean surface, overlying the layer of Winter Water at the freezing point. The integration of the salinity decrease from Winter Water should correspond to the total ice-melt amount. We developed an algorithm to extract the profiles that clearly show the salinity deficit and converted the salinity deficit to the ice-melt amount from all available data. The climatological map shows that ice-melt amount decreases toward the ice edge and exhibits large values around the northern Sakhalin Island, reflecting the ice thickness distribution. In the southern area (south of 48°N), where sea ice is transported from the north, the average ice-melt amount is estimated to be ~ 71 cm in thickness. It is clearly shown that the ice-melt amount has decreased by ~ 30% in the southern area since the 1990s. These changes possibly affect the regional climate through the decreased latent heat of sea ice and potentially affect biological production through weakened stratification caused by decreased ice melt. We also suggested that ice-melt amount did not show a significant trend during the 1930s–1970s, implying that our methodology could extract information on sea ice before the era of satellite observations.

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来源期刊
Journal of Oceanography
Journal of Oceanography 地学-海洋学
CiteScore
3.50
自引率
13.00%
发文量
42
审稿时长
6-12 weeks
期刊介绍: The Journal of Oceanography is the official journal of the Oceanographic Society of Japan and open to all oceanographers in the world. The main aim of the journal is to promote understandings of ocean systems from various aspects including physical, chemical, biological, geological oceanography as well as paleoceanography, etc. The journal welcomes research focusing on the western North Pacific and Asian coastal waters, but the study region is not limited to the Asian Pacific. The journal publishes original articles, short contributions, reviews, and correspondence in oceanography and related fields.
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