权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

The observational and numerical study on the impact of the Amur to the Okhotsk sea ice

阿穆尔河对鄂霍茨克海冰影响的观测与数值研究

基本信息

批准号：
12573006
负责人：
TACHIBANA Yoshihiro
金额：
$ 3.46万
依托单位：
TOKAI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2003
项目状态：
已结题

项目摘要

PurposesThe Sea of Okhotsk(OK), which is located between the Sibeiian continent and the North Pacific, is covered by ice from November through June, and is one of the southernmost ice-covered oceans in the Northern Hemisphere. The interannual variability of the sea-ice in the OK is large and sea-ice coverage has abniptly decreased since the end of the 1980's. Also, the sea-ice influences large scale climate such as the development of the Aleutian low and the formation of the Noiih Pacific intermediate waters 8-10. In analogy with the Arctic Ocean, sea-ice in the OK has been believed to be influenced by the ground hydrological processes. Previous studies suggest the existance of a highly siralilied, low-salinity surface layer in the OK, which suppresses deep convection and promotes freezing. It has also been speculated that the low-salinity layer is mainly due to the inflow of the fresh water from the Amur River. Although previous studies attempted to find evidence of the river-water in … More fluence on the sea-ice using data analyses, the lack of reliable interannual data for sea-ice precluded direct comparison between the ice-data and the discharge-data Because the period of reliable satellite-based ice-data has become long enough to analyze the inteninnual variability, we are now able to directly compare the two. The purpose of our study is to collect the Amur discharge data and to quantify the effects of the Amur discharge on the sea-ice on interannual and longer time scalesResultsThe impacts of ground hydrology on the high-latitude oceans, such as melting glaciers and discharge from rivers in the oceans, can affect global climate by mediating the flow of low-density, fresh water inflow that strengthens the ocean's stratification, suppresses the thermohaline circulation and also promotes sea-ice formation. Ourtime series analysis based on sea-ice and river-discharge data indicates that the effect of this fresh water on the sea-ice in the Sea of Okhotsk, into which the second largest Siberian River, the Amur, discharges, is relatively unimportant Interannual variations in the ice extent are negatively correlated with the amount of discharge. We find evidence that the inflow of wanner river water tends to the raise of the sea surface temperature, and that it suppresses ice formation in the following winter. These findings imply that sensible heat transported by large rivers in high latitudes should be reconsidered in studying global climate change. Less

用途鄂霍次克海（俄克拉荷马州）位于西伯利亚大陆和北太平洋之间，每年11月至6月被冰雪覆盖，是北方半球最南端的冰雪覆盖海洋之一。自80年代末以来，俄克拉何马州海冰的年际变化较大，海冰覆盖率急剧减少。此外，海冰影响大尺度气候，如阿留申低压的发展和诺依太平洋中间沃茨的形成8-10。与北冰洋类似，OK的海冰被认为受到地面水文过程的影响。以前的研究表明，在OK存在一个高度干燥，低盐度的表层，抑制了深对流，促进了冻结。也有人推测，低盐度层主要是由于阿穆尔河的淡水流入。虽然以前的研究试图找到证据的河水， ...更多信息由于缺乏可靠的海冰年际资料，无法直接比较海冰资料和流量资料。由于可靠的卫星海冰资料的周期已经足够长，可以分析海冰的年际变化，我们现在能够直接比较两者。结果高纬度地区的冰川融化、河流入海等地面水文作用，通过调节低密度淡水的流入，加强了海洋的层化作用，抑制温盐环流，也促进海冰的形成。我们的时间序列分析的基础上的海冰和河流流量的数据表明，在鄂霍次克海，第二大西伯利亚河流，阿穆尔河，流入的淡水对海冰的影响是相对不重要的冰的范围的年际变化是负相关的流量。我们发现证据表明，万纳河水的流入倾向于提高海表温度，并抑制冰的形成在第二个冬天。这些发现意味着在研究全球气候变化时，应该重新考虑高纬度大河输送的感热。少