Anomalous oceanographic conditions were observed in the northwestern Bering Sea in 2017–2018, including warmer air and water temperatures and reduced ice cover. Their effects on the water structure and circulation are considered. These conditions were formed on the background of warming tendency known in the Bering Sea since 2014, but the year 2018 was exceptional even relative to this background. In this year, deflections of some properties from their mean values exceeded two standard deviations (>2σ). The main reason for such abnormal conditions was southerly winds prevailed over the entire sea in winter because of a westward shift of the Aleutian Low; another factor was the strengthened advection of oceanic waters that still were abnormally warm after the period of extreme warming in the North-East Pacific in 2014–2016. As the result, the ice extent in winter and spring was below its mean value (more than twice lower in 2018), the air and water temperatures were above their mean values through the year (up to 15 and 3 °C higher, respectively, in 2018), the cold water mass was not formed at the shelf bottom in winter and was absent in summer. Under this considerable redistribution of water density, the water circulation changed, the Navarin Current weakened and was even absent in fall 2018/ and the northward water transport toward the Bering Strait was realized through the eastern shelf and delivered the coastal waters from Alaska instead of the waters from the deep-water basins, as has been usual. The oceanographic conditions in 2018 were statistical outliers, atypical even for recent period of warming, but such conditions could be expected if the warming continues. Thus, the phenomenon of 2017–2018 could be useful for understanding and predicting the reconstruction of the oceanographic regime in the near future.

在2017-2018年的白令海西北部，观测到异常的海洋学条件，包括气温和水温升高以及冰盖减少。考虑它们对水结构和循环的影响。这些条件是自2014年以来在白令海已知的变暖趋势的背景下形成的，但即使相对于这种背景，2018年也是例外。在今年，某些属性与其平均值的偏差超过了两个标准偏差（>2σ）。造成这种异常情况的主要原因是，由于阿留申低点向西移动，冬季冬季南风盛行。另一个因素是，在2014-2016年东北太平洋经历了极端变暖期之后，仍对异常温暖的海洋水的平流性增强。作为结果，冬季和春季的冰面积低于其平均值（2018年降低了两倍多），全年的空气和水温均高于其平均值（2018年分别升高了15和3°C），冬季没有在架子底部形成冷水团，而在夏天则没有。在如此大量的水密度重新分配下，水循环发生变化，纳瓦林潮流减弱，甚至在2018年秋季消失，并且通过东部陆架实现了向白令海峡的北向水运，并从阿拉斯加而非像往常一样来自深水盆地的水。2018年的海洋条件是统计上的异常值，即使在最近的变暖时期也是非典型的，但如果变暖持续，这种情况是可以预期的。从而，