Arctic marine ecosystems are experiencing substantial changes associated with sea ice loss and surface warming. The most obvious and dramatic changes include earlier ice retreat and a longer ice-free season, particularly on Arctic inflow shelves, including the Barents Sea in the Atlantic Arctic and the northern Bering Sea and Chukchi Sea in the Pacific Arctic. The extreme variability observed in recent years in the Pacific Arctic is unparalleled in recorded history. This volume is devoted to studies that integrate research across various components of the Arctic marine ecosystem to better characterize these changes. The intent of this integrated approach is to better understand the linkages and interactions that shape ecosystem processes, influence timing and phenology of events, and inform predictions of future conditions. The studies presented in this Special Issue investigate processes in the Bering Sea, Chukchi Sea, and Beaufort Sea. The data derive from remote sensing, ship-based surveys, and integrated data products. The research presented includes time-series analyses on environmental change across the greater Pacific Arctic, heat flux, stratification and mixing dynamics, vertical structure, and wind and current patterns. It explores the influence of physical processes on, and seasonal and annual variability in, primary production, nutrient distribution, and the export of biogenic matter. It also examines the effects of oceanographic variability on zooplankton taxa, the distribution of larval fishes, age and growth in Arctic fishes, responses of salmon to warming, and variability in cetacean occurrence. These studies are designed to provide new insights on integrated ecosystem research in the Pacific Arctic, with a focus on improving understanding of ecosystem processes, timing and change. This volume marks the first in a series of research volumes supported by the North Pacific Research Board to integrate ecosystem research in the Pacific Arctic and to inform our collective understanding of the rapid transformation in this region.

北极海洋生态系统正在经历与海冰流失和地表变暖有关的重大变化。最明显和最戏剧性的变化包括更早的退冰和更长的无冰季节，特别是在北极流入架上，包括大西洋北极的巴伦支海和太平洋北极的白令海和楚科奇海。近年来在太平洋北极地区观察到的极端变化是有史以来无与伦比的。本册致力于将北极海洋生态系统各个组成部分的研究进行整合以更好地描述这些变化的研究。这种综合方法的目的是更好地理解影响生态系统过程，影响事件时间和物候的联系和相互作用，并为未来状况提供预测。本期特刊中的研究调查了白令海，楚科奇海和波弗特海的过程。数据来自遥感，基于舰船的调查和集成数据产品。提出的研究包括对整个太平洋北极地区环境变化，热通量，分层和混合动力，垂直结构以及风向和潮流模式的时间序列分析。它探讨了物理过程对初级生产，营养分配和生物源物质输出的影响以及季节和年度变化。它还检查了海洋变化对浮游生物类群的影响，幼体鱼的分布，北极鱼的年龄和生长，鲑鱼对变暖的响应以及鲸类动物的变化。这些研究旨在提供有关太平洋北极生态系统综合研究的新见解，重点是增进对生态系统过程，时间和变化的理解。该卷是北太平洋研究委员会支持的一系列研究卷中的第一本，旨在整合太平洋北极地区的生态系统研究，并为我们对该地区快速转变的集体理解提供信息。