Sea ice melt and its impact on the upper ocean properties in a warming Pacific Arctic

我们成功地测试并实施了一种根据白令海的海洋观测来估计海冰融化量的方法。首先从温度和盐度数据估计淡水总厚度，然后使用氧同位素比值数据消除河流水域的影响。使用卫星获取的海冰产量和厚度估计值进行验证，结果表明一致性很好。进一步的数据分析表明，白令海的海冰产量/融化从1980年以前开始显著减少。然后，我们精确地估计了楚科奇海和博福特海的海冰融化量，并发现2005年后海冰融化量有增加的趋势。这一趋势与过去20年来多年冰的融化有关，之前还没有被量化。我们在2022年10月组织了一个国际工作坊来介绍该项目，收集知识，并讨论研究合作和数据交换。这次研讨会有27人参加，其中包括来自外国机构的4名参与者(随后，台湾国立中央大学的一名教授与北海道大学和东京大学的两名日本科学家建立了研究合作关系)。我们进一步在国家极地科学研究所举办的第七届北极研究国际研讨会上介绍了我们的研究成果。通过这次会议，可能会有另外两名研究合作者加入该项目

We successfully tested and implemented a methodology for estimating sea ice melt amount from ocean observations in the Bering Sea. Total freshwater thickness was first estimated from temperature and salinity data, and the effects of river waters were then removed using oxygen isotope ratio data.Validation using satellite-derived estimates of sea ice production and thickness revealed good consistency. Further data analysis revealed a significant decrease in the Bering Sea ice production/melt starting before 1980.We then estimated precisely the sea ice melt volume in the Chukchi and Beaufort seas, and detected an increasing trend in sea ice melt volume after 2005. This trend is related to the melting of multi-year ice over the past 2 decades, and has not been quantified before.We organised an international workhshop in October 2022 to introduce the project, gather knowledge and discuss research collaboration and data exchange. The workshop gathered 27 participants, including 4 partipants from foreign institution (following this, a research collaboration between a professor of National Central University in Taiwan and 2 Japanese scientists at Hokkaido University and Tokyo University was established).We further presented results of our research at the 7th International Symposium on Arctic Research, held by the National Institute of Polar Science. Through this meeting, two more research collaborators are likely to join the project