Anadyr Strait, located at the northernmost reaches of the Bering Sea, influences pan‐Arctic climate through processes occurring in the strait as the Siberian Coastal Current carries water from the subpolar North Pacific Ocean into the western Arctic Ocean. A sharp sea surface temperature front near the Anadyr Strait segregates a tongue‐shaped mass of warm water from areas of cold‐water upwelling proximate to the Siberian coast. To clarify dynamical processes in this region, we conducted shipboard observations through and near the Anadyr and Bering straits during the summers of 2017 and 2018. Microstructure measurements show enhanced turbulence near the sea floor as strong throughflow occurs in the narrow straits. Direct observations of ocean currents indicate that the semidiurnal barotropic tide partly contributes to the near‐bottom currents driving mixing. Frictional effects accompanying the barotropic current are examined using a three‐dimensional regional model. Bottom friction produces a westward Ekman current in the bottom boundary layer, which then causes upwelling of underlying cold water on the western (Siberian) side of the Anadyr Strait. Secondary circulation across the strait is also maintained by the near‐surface eastward velocity, which is established by the steep slope of the main thermocline.

中文翻译：

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阿纳德尔海峡附近的冷水上升流：观测与模拟

位于白令海最北端的阿纳德尔海峡通过海峡发生的过程影响泛北极气候，因为西伯利亚沿海水流将水从北极亚极地带入北冰洋西部。靠近阿纳德尔海峡的海表温度锋线，将舌状的热水与西伯利亚海岸附近的冷水上升区隔离开来。为了弄清该地区的动力学过程，我们在2017年和2018年夏季对Anadyr和Bering海峡及其附近进行了船上观测。微结构测量结果表明，由于狭窄海峡中发生强通流，海床附近的湍流增强。对洋流的直接观察表明，半日正压潮在一定程度上促成了近地洋流驱动的混合。使用三维区域模型检查了正压电流伴随的摩擦效应。底部摩擦在底部边界层产生向西的Ekman潮流，然后在Anadyr海峡的西（西伯利亚）侧引起下伏的冷水上升。海峡两岸的二次循环也由近地表的东向速度维持，该速度由主温跃层的陡坡建立。然后在Anadyr海峡西侧（西伯利亚）引起下层冷水上升。海峡两岸的二次循环也由近地表的东向速度维持，该速度由主温跃层的陡坡建立。然后在Anadyr海峡西侧（西伯利亚）引起下层冷水上升。海峡两岸的二次循环也由近地表的东向速度维持，该速度由主温跃层的陡坡建立。