GLOBEC: Gulf of Alaska Long Term Observation Program

PI将参与阿拉斯加湾长期观测计划（GOA-LTOP），作为东北太平洋（NEP） GLOBEC计划第二阶段的一部分。果阿大陆架支持着丰富的生态系统，其中包括许多具有重要商业意义的渔业。这种生产力的基础是神秘的，因为果阿大陆架很深，受到有利于下沉的风的推动，并受到大量营养贫乏的沿海淡水排放的滋养。风和淡水排放都与阿留申低地的强度和位置密切相关。果阿邦生态系统在年代际和年际时间尺度上经历了大量的物理和生物变化。虽然其中一些变化与各种气候指数相关，但对气候变化和生态系统响应的机制理解尚不充分。本LTOP的总体目标是了解和量化该大陆架热沉积线、化学和生物特性及其关系的时间（季节和年际）和空间（跨大陆架和沿大陆架）变化。这项研究将为其他同期研究提供季节性和年际背景，并为模型评估提供边界条件和数据集，从而支持GLOBEC的目标。实地工作包括每年在果阿邦北部进行7、9天的跨学科巡航。研究区域包括220公里长的苏厄德线（20世纪70年代采样），它横跨大陆架和斜坡，并对阿拉斯加海岸流（ACC）进行高分辨率采样，上游，下游和威廉王子湾。ACC是鲑鱼从幼崽区迁徙到果阿地区的重要大陆架栖息地。

The PI's will particpate in the Gulf of Alaska Long-Term Observation Program (GOA-LTOP) as part of Phase II of the Northeast Pacific (NEP) GLOBEC program. The GOA shelf supports a rich ecosystem that includes many commercially important fisheries. The basis for this productivity is enigmatic for the GOA shelf is deep, forced by downwelling-favorable winds, and fed by a massive nutrient-poor coastal freshwater discharge. Both the winds and the freshwater discharge are intimately linked to the strength and position of the Aleutian Low. The GOA ecosystem experiences substantial physical and biological changes on decadal and inter-annual time scales. Although some of these changes are correlated with various climatic indices a mechanistic understanding of climate change and ecosystem response is unavailable. The generic goal of this LTOP is to understand and quantify temporal (seasonal and interannual) and spatial (cross- and along-shelf) variations in the thermolialine, chemical, and biological pro-perties and relationships of this shelf. This research will support GLOBEC goals by providing the seasonal and interannual context for other concurrent studies, and by providing boundary conditions and data sets for model evaluation. The field effort involves seven, 9-day interdisciplinary cruises/year in the northern GOA. The study area encompasses the 220-km long, Seward Line (sampled in the 1970s) that extends across the shelf and slope and high resolution sampling of the Alaska Coastal Current (ACC), upstream, downstream, and with-in Prince William Sound. The ACC is an important shelf habitat for yoy salmon migrating from nursery areas in the sound and into the GOA.