caa a22 4500 605455635 CHVBK 20210128100213.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s10872-015-0276-6 doi (NATIONALLICENCE)springer-10.1007/s10872-015-0276-6 Delayed responses of the oceanic Beaufort Gyre to winds and sea ice motions: influences on variations of sea ice cover in the Pacific sector of the Arctic Ocean [Elektronische Daten] [Eri Yoshizawa, Koji Shimada, Ho Ha, Tae Kim, Sung Kang, Kyung Chung] In the late 2000s, the dominant sea ice type in the Arctic Ocean changed from multi-year ice to first-year ice. In this condition, winter growth of first-year ice and resultant ice thickness at the melt onset are key preconditions on whether sea ice can survive or will disappear during the following summer. The growth rate strongly depends on upper ocean thermal conditions. In the Pacific sector of the Arctic Ocean, the warm Pacific Summer Water, which is a major heat source affecting the sea ice growth, is transported toward the basin by the oceanic Beaufort Gyre, driven by winds and sea ice motions, but the response time scale of the oceanic Beaufort Gyre to surface forcing has been unclear until now. In the present study, we examine the relationship between the ocean dynamic height near the Northwind Ridge as a proxy of the northward volume transport and curls of winds and sea ice velocities, using multiple regression models that evaluate relative contributions of past surface forcing to the current state of the oceanic Beaufort Gyre. As a result, the time scale of the delayed oceanic response in 2006-2012 was estimated to be about 3 years. Taking into account the response time scale, the multiple regression model using the satellite-derived sea ice motion data successfully reconstructed the observed variations of ocean dynamic heights within an accuracy of 0.2 dynamic cm, which corresponded to about 2% of the amplitude of the observed variations. The Oceanographic Society of Japan and Springer Japan, 2015 Arctic Ocean nationallicence Oceanic Beaufort Gyre nationallicence Sea ice motion nationallicence Sea ice reduction nationallicence Pacific Summer Water nationallicence Yoshizawa Eri Graduate School of Tokyo University of Marine Science and Technology, Konan 4-5-7, 108-8477, Minato-ku, Japan aut Shimada Koji Graduate School of Tokyo University of Marine Science and Technology, Konan 4-5-7, 108-8477, Minato-ku, Japan aut Ha Ho Department of Ocean Sciences, Inha University, 402-751, Incheon, Korea aut Kim Tae Korea Polar Research Institute, 406-840, Incheon, Korea aut Kang Sung Korea Polar Research Institute, 406-840, Incheon, Korea aut Chung Kyung Korea Polar Research Institute, 406-840, Incheon, Korea aut Journal of Oceanography Springer Japan 71/2(2015-04-01), 187-197 0916-8370 71:2<187 2015 71 10872 https://doi.org/10.1007/s10872-015-0276-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10872-015-0276-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yoshizawa Eri Graduate School of Tokyo University of Marine Science and Technology, Konan 4-5-7, 108-8477, Minato-ku, Japan aut NATIONALLICENCE 700 1- Shimada Koji Graduate School of Tokyo University of Marine Science and Technology, Konan 4-5-7, 108-8477, Minato-ku, Japan aut NATIONALLICENCE 700 1- Ha Ho Department of Ocean Sciences, Inha University, 402-751, Incheon, Korea aut NATIONALLICENCE 700 1- Kim Tae Korea Polar Research Institute, 406-840, Incheon, Korea aut NATIONALLICENCE 700 1- Kang Sung Korea Polar Research Institute, 406-840, Incheon, Korea aut NATIONALLICENCE 700 1- Chung Kyung Korea Polar Research Institute, 406-840, Incheon, Korea aut NATIONALLICENCE 773 0- Journal of Oceanography Springer Japan 71/2(2015-04-01), 187-197 0916-8370 71:2<187 2015 71 10872