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Arctic sea ice volume export through the Fram Strait: variation and its effect factors

Acta Oceanologica Sinica 2023年第5期42卷 166-178页

作者： Haili Li Changqing Ke Qinghui Zhu Xiaoyi Shen Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology/Key Laboratory for Land Satellite Remote Sensing Applications of Ministry of Natural Resources School of Geography and Ocean ScienceNanjing UniversityNanjing 210023China Collaborative Innovation Center of Novel Software Technology and Industrialization Nanjing 210023China Collaborative Innovation Center of South China sea Studies Nanjing 210023China

Arctic sea ice export is important for the redistribution of freshwater and sea ice ***,we use the sea ice thickness,sea ice velocity,and sea ice concentration(SIC)to estimate the exported sea ice volume through the Fram Strait from 2011 to *** further analyse the contributions of the sea ice thickness,velocity and concentration to sea ice volume ***,the relationships between atmospheric circulation indices(Arctic Oscillation(AO),North Atlantic Oscillation(NAO),and Arctic Dipole(AD))and the sea ice volume export are ***,we analyse the impact of wind-driven oceanic circulation indices(Ekman transport(ET))on the sea ice volume *** sea ice volume export rapidly increases in winter and decreases in *** exported sea ice volume in winter is likely to exceed that in spring in the *** sea ice thickness,velocity and SIC,the greatest contribution to sea ice export comes from the ice *** exported sea ice volume through the zonal gate of the Fram Strait(which contributes 97%to the total sea ice volume export of the Fram Strait)is much higher than that through the meridional gate(3%)because the sea ice flowing out of the zonal gate has the characteristics of a high thickness(mainly thicker than 1 m),a high velocity(mainly faster than 0.06 m/s)and a high concentration(mainly higher than 80%).The AD and ET explain 53.86%and 38.37%of the variation in sea ice volume export,respectively.

关键词： sea ice thickness sea ice velocity sea ice concentration sea ice volume export Arctic Dipole Ekman transport Fram Strait

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