Collaborative Research - Stratification on the Bering Shelf and its consequences for nutrients and the ecosystem: The effects of ice and coastal water advection

提供资金用于研究物理变化对白令陆架生态系统的过程和结构的影响，特别强调陆架循环重新分配的淡水或从海冰融化引入的淡水如何改变分层和营养分布。首席调查人员询问海冰的变化如何影响平流和混合；低盐度、营养缺乏的沿海水域的可变通量如何影响生产；跨陆架通量如何建立和改变；这些通量如何对气候变化作出反应；季节层结周期如何受到控制；以及沿海漂浮气流如何演变。2008-2010年实地工作将侧重于白令海中部陆架，并将使用水文地理学，包括广泛的d18O采样，以及跨越中央陆架大部分地区的九系泊阵列。系泊设备将以不同的方式携带ADCP、温度/温度记录器、荧光计和温度链。在其他支助下，将通过水文学和d18O采样和漂流研究来扩大测量。分析还将把风强迫、海岸排放、表面浮力通量和冰层厚度和漂移纳入合成数据集及其解释。这些数据与其他地方资助的另一个系泊计划一起，将提供许多必要的背景环流和层结信息，以从最佳环境中放置生物数据。

Funds are provided to study the impact of physical variability on the processes and structure of the Bering shelf ecosystem, with special emphasis on how freshwater redistributed by the shelf circulation or introduced from sea ice melt modifies stratification and nutrient distributions. The principal investigators inquire how changes in sea ice affect advection and mixing; how variable fluxes of low-salinity, nutrient-deficient coastal waters may affect production; how cross-shelf fluxes are established and altered; how these fluxes might respond to climate change; how the seasonal stratification cycle is controlled; and how the buoyant coastal flow evolves.The 2008-2010 field effort will focus on the central Bering Sea shelf and will employ both hydrography, including extensive d18O sampling, and a nine-mooring array that spans most of the central shelf. The moorings variously will carry ADCPs, T/C recorders, fluorometers, and temperature chains. The measurements will be augmented by hydrographic and d18O sampling and drifter studies under other support. Analysis will also incorporate wind forcing, coastal discharges, surface buoyancy fluxes, and ice thickness and drift into the synthesized data set and its interpretation.These data, in conjunction with another mooring program funded elsewhere, will provide much of the background circulation and stratification information necessary to place the biological data from BEST in context.