Collaborative Research: Submarine Groundwater and Freshwater Inputs Along the Western Antarctic Peninsula

全球范围内的研究表明，向海输送地下水到海岸可能在近岸水域的养分、微量营养素（如铁）、碳和其他地球化学收支方面发挥重要作用。南极洲的相应情况很可能是类似的，但在很大程度上没有得到研究。该项目的目标是量化海底地下水排放率及其相关的营养物和铁向南极沿海水域的通量。将使用一套化学、同位素和放射化学示踪剂来确定这种再循环海水通量和地下冰川淡水流量组分的排放规模，并将其与淡水源（包括融化的冰川和海冰）的同步地表输入量进行比较。目前对帕尔默站近海水域和南极半岛西部下游水域初级生产的设想表明，几种大陆来源增加了微量营养素铁和其他营养素的限量。迄今为止，该地区SGD溶解铁的贡献尚不清楚，但可能是这些生产性沿海水域地球化学预算的重要组成部分。将估算铁和营养物质的跨货架混合率，以更好地约束SGD的重要性。

Studies throughout the globe indicate that the seaward transport of groundwater to the coast may play a significant role in the contribution of nutrient, micronutrient (e.g. Fe), carbon and other geochemical budgets of nearshore waters. The corresponding situation in Antarctica is likely to be similar, but is largely unstudied. The objective of this project is to quantify the rate of submarine groundwater discharge (SGD) and its associated fluxes of nutrients and iron to coastal Antarctic waters. The size of this discharge of the flux of re-circulated seawater and the subsurface glacial freshwater flow component, compared with the collocated surface inputs of freshwater sources, including melting glacial and sea-ice will be determined using a suit of chemical, isotopic and radiochemical tracers. Current scenarios of the primary production of the waters offshore of Palmer Station and down-current of the Western Antarctic Peninsula suggest that limiting amounts of micronutrient iron, and other nutrients, are augmented by several continentally derived sources. The contribution of SGD dissolved Fe in this region is to date unknown, yet may be a significant component of the geochemical budgets of these productive coastal waters. Cross shelf mixing rates of Fe and nutrients will be estimated to better constrain the importance of SGD.