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| 1 | 欧亚海盆大西洋水输运过程及热释放研究进展显示文摘温暖的大西洋水进入北冰洋后,通过热量释放影响海洋和大气环境。在欧亚海盆,大西洋水深度浅,其热量释放是海冰融化的重要热源,也是海冰减退和北极放大的关键因素。大西洋水输送的环流结构没有变化,而是通过流速的变化改变热量输送的效率。大西洋水在流动过程中通过湍流运动、冬季对流和双扩散三大物理机制向上释放热量而降温。近年来,大西洋水热量增加并将暖信号向北冰洋内部输送,进而影响下游加拿大海盆的海洋过程。增暖的热源来自弗拉姆海峡的异常暖事件,体现为北欧海挪威大西洋流水温长期变化因素与低频振荡因素的共同作用。 | 吴延俊 赵进平 | 2020 | 地球科学进展2020，35，3： | 1 |
| 2 | Turbulent mixing above the Atlantic Water around the Chukchi Borderland in 2014显示文摘This study presents an analysis of the CTD data and the turbulent microstructure data collected in 2014, the turbulent mixing environment above the Atlantic Water(AW) around the Chukchi Borderland region is studied.Surface wind becomes more efficient in driving the upper ocean movement along with the rapid decline of sea ice,thus results in a more restless interior of the Arctic Ocean. The turbulent dissipation rate is in the range of4.60×10^(–10)^(–3.31×10^(–9) W/kg with a mean value of 1.33×10^(–9) W/kg, while the diapycnal diffusivity is in the range of1.45×10^(–6)–1.46×10^(–5)m^2/s with a mean value of 4.84×10^(–6) m^2/s in 200–300 m(above the AW). After investigating on the traditional factors(i.e., wind, topography and tides) that may contribute to the turbulent dissipation rate, the results show that the tidal kinetic energy plays a dominating role in the vertical mixing above the AW. Besides, the swing of the Beaufort Gyre(BG) has an impact on the vertical shear of the geostrophic current and may contribute to the regional difference of turbulent mixing. The parameterized method for the double-diffusive convection flux above the AW is validated by the direct turbulent microstructure results. | ZHONG Wenli GUO Guijun ZHAO Jinping LI Tao WANG Xiaoyu MU Longjiang | 2018 | Acta Oceanologica Sinica2018，37，3： | 1 |
| 3 | Hydrographic Characteristics and Oceanic Heat Flux in the Upper Arctic Ocean over the Alpha Ridge Observed by the DTOP Platform in 2018 and 2021显示文摘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 20m to 40m 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 F_(w)^(OHF)was elevated,with a maximum value of above 25Wm^(-2).F_(w)^(OHF)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 F_(w)^(OHF)were in the range of 3–4Wm^(-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,F_(w)^(OHF)was reduced(<2 Wm^(-2))except during rare events when it elevated F_(w)^(OHF)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. | WANG Yongjun LI Tao | 2024 | Journal of Ocean University of China2024，23，2： | 0 |
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