The nutrient flux through Bering Strait has significant impacts on the biomass and community composition of phytoplankton in the western Arctic Ocean. Based on a three-dimensional ocean-sea ice-biogeochemical model, the hindcast simulations from 1998 to 2015 suggest that the nitrate flux through Bering Strait reaches the peak during February–May (~12 kmol N/s) and then decreases to a relatively lower level (~8 kmol N/s) in July and maintains this level until January. The interannual nitrate fluxes in winter and summer were analyzed with winter defined as February–March and summer defined as July–August. The main findings are summarized as follows. (1) Shelf-slope exchange near Cape Navarin plays a key role in poleward nutrient supply since the main nutrient transport belt over the Bering shelf corresponds to the pathway of Anadyr Current from Cape Navarin to Bering Strait. (2) In the winter season, the interannual nitrate flux through Bering Strait has a significant correlation (r = 0.80, p < 0.01) with that through the section adjacent to Cape Navarin (CN section) in the fall season. This remote interannual signal from upstream appears to regulate the Bering Strait nitrate flux via horizontal advection so that it can be considered as a predictor factor. (3) In the summer season, the nitrate budget in the water column from Cape Navarin to Bering Strait indicates that biological activity plays a limited role in the interannual variation in poleward nitrate flux. Instead, this interannual variability is determined by the volume transport through Bering Strait and upstream advection.

通过白令海峡的养分通量对北冰洋西部浮游植物的生物量和群落组成有重大影响。基于三维海冰生物地球化学模型，1998年至2015年的后验模拟表明，穿过白令海峡的硝酸盐通量在2月至5月达到峰值（约12 kmol N / s），然后相对下降。较低的水平（约8 kmol N / s），一直保持到1月。分析了冬季和夏季的年际硝酸盐通量，其中冬季定义为2月至3月，夏季定义为7月至8月。主要发现概括如下。（1）纳瓦林角附近的陆坡交换在极地养分供应中起关键作用，因为白令陆架上的主要养分输送带对应于纳瓦林海角从纳瓦林角到白令海峡的路径。（2）在冬季，穿过白令海峡的年际硝酸盐通量具有显着的相关性（r  = 0.80，p  <0.01），与秋季的纳瓦林角附近部分（CN部分）相关。来自上游的远程年际信号似乎通过水平对流来调节白令海峡的硝酸盐通量，因此可以将其视为预测因素。（3）在夏季，从纳瓦林角到白令海峡的水柱中的硝酸盐收支表明，生物活性在极地硝酸盐通量的年际变化中起着有限的作用。相反，这种年际变化是通过白令海峡和上游平流的体积输送来确定的。