首页|Hydrographic Characteristics and Oceanic Heat Flux in the Upper Arctic Ocean over the Alpha Ridge Observed by the DTOP Platform in 2018 and 2021

Hydrographic Characteristics and Oceanic Heat Flux in the Upper Arctic Ocean over the Alpha Ridge Observed by the DTOP Platform in 2018 and 2021

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In 2018 and 2021,the Drift-Towing Ocean Profilers(DTOP)provided extensive temperature and salinity data on the upper 120m ocean through their drifts over the Alpha Ridge north of the Canada Basin.The thickness and temperature maximum of Alaska Coastal Water(ACW)ranged from 20 m to 40 m and-1.5℃ to-0.8 ℃,respectively,and the salinity generally maintained from 30.2 to 32.5.Comparison with World Ocean Atlas 2018's climatology manifested a 40m-thick and warm ACW roughly ex-ceeding the temperature maximum by 0.4-0.5℃ in June-August 2021.This anomalously warm ACW was highly related to the ex-pansion of the Beaufort Gyre in the negative Arctic Oscillation phase.During summer,the under-ice oceanic heat flux FwOHF was elevated,with a maximum value of above 25 Wm-2.FwOHF was typically low in the freezing season,with an average value of 1.2Wm-2.The estimates of upward heat flux contributed by ACW to the sea ice bottom FwOHF were in the range of 3-4 Wm 2 in June-August 2021,when ACW contained a heat content of more than 80MJm-2.The heat loss over this period was driven by a weak stratification upon the ACW layer associated with a surface mixed layer(SML)approaching the ACW core.After autumn,FwOHF was reduced(＜2 W m-2)except during rare events when it elevated FwOHF slightly.In addition,the intensive and widespread Ekman suction,which created a violent upwelling north of the Canada Basin,was largely responsible for the substantial cooling and thinning of the ACW layer in the summer of 2021.

Arctic Oceanoceanic heat fluxAlaska Coastal WaterAlpha Ridge

WANG Yongjun、LI Tao

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College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266100,China

Frontier Science Center for Deep Ocean Multispheres and Earth System(FDOMES)and Physical Oceanography Laboratory,Ocean University of China,Qingdao 266100,China

Laoshan Laboratory,Qingdao 266237,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key R&D Program of ChinaFundamental Research Funds for the Central Universities

42276239419410122019YFC1509101202165005

2024

10.1007/s11802-024-5627-8

中国海洋大学学报(自然科学英文版)
中国海洋大学

中国海洋大学学报(自然科学英文版)

CSTPCD
影响因子：0.268
ISSN：1672-5182
年,卷(期)：2024.23(2)
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