Interannual Variations of Sea-ice Extent in the Okhotsk Sea – A Pan-Okhotsk Climate System Perspective

IF 1.6 4区地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmosphere-Ocean Pub Date : 2023-02-14 DOI:10.1080/07055900.2023.2175639

H. Ueda, Masaya Kuramochi, H. Mitsudera

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Abstract

ABSTRACT This study investigated interannual variations in the late winter (January–March) sea-ice extent in the Okhotsk Sea (OS) and its relationship with the atmospheric circulation from 1971 to 2018. During heavy sea-ice years, negative air temperature anomalies are broadly discernable between the northeastern part of Eurasia and the North Pacific including the coastal polynyas adjacent to the northern and western coast of the OS. Cold air mass (CAM) genesis indicates the importance of the insulation effect of sea-ice in the persistent cold air temperatures in the OS. Light sea-ice years are marked by anomalous southeasterly winds and the resultant warm air advection associated with increases in extratropical cyclones. Southeasterly anomalies are associated with the weakening of the Aleutian low. Upper-tropospheric anticyclones dominating around the OS are closely connected with intensified convection in the vicinity of the South China Sea through propagation of a stationary Rossby wave relevant to La Niña-like warm sea surface temperature anomalies. The seasonal evolution of the CAM amount, sea ice in the Sea of Okhotsk, and the Aleutian low suggest that there may be chain feedback between them.

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鄂霍次克海海冰范围的年际变化——泛鄂霍次克气候系统视角

研究了1971 - 2018年鄂霍次克海冬末(1 - 3月)海冰范围的年际变化及其与大气环流的关系。在海冰丰沛的年份，欧亚大陆东北部和北太平洋(包括与欧亚大陆北部和西部海岸相邻的沿海多冰区)之间的气温普遍呈负异常。冷气团的形成表明海冰的保温作用在东亚地区持续的冷空气温度中起着重要作用。轻海冰年的特点是反常的东南风和由此产生的暖空气平流，与温带气旋的增加有关。东南异常与阿留申低压的减弱有关。在OS周围占主导地位的对流层上层反气旋通过与La Niña-like海温异常相关的静止Rossby波传播与南海附近对流增强密切相关。CAM量、鄂霍次克海海冰和阿留申低潮的季节变化表明它们之间可能存在链式反馈。

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来源期刊

Atmosphere-Ocean 地学-海洋学

CiteScore

2.50

自引率

16.70%

发文量

审稿时长

>12 weeks

期刊介绍： Atmosphere-Ocean is the principal scientific journal of the Canadian Meteorological and Oceanographic Society (CMOS). It contains results of original research, survey articles, notes and comments on published papers in all fields of the atmospheric, oceanographic and hydrological sciences. Arctic, coastal and mid- to high-latitude regions are areas of particular interest. Applied or fundamental research contributions in English or French on the following topics are welcomed: climate and climatology; observation technology, remote sensing; forecasting, modelling, numerical methods; physics, dynamics, chemistry, biogeochemistry; boundary layers, pollution, aerosols; circulation, cloud physics, hydrology, air-sea interactions; waves, ice, energy exchange and related environmental topics.