The Geochemistry of Trace Elements in Arctic Shelf Waters

这个项目是对北冰洋中自然存在的微量元素的地球化学性质的研究。主要的微量元素是铝，但也将测量铁、铍和硒。目的是确定巴伦支海、喀拉海和拉普特夫海陆架卤水的铝丰度、变异性和来源，并利用这些结果推断北冰洋东部的水文过程。挪威海和格陵兰海的溶解铝浓度比水团交换时预期的要高得多，这表明这是一个区域外部铝来源。虽然通常的途径是铝的溶解通过大气并沉积在地表，并通过河流排放，但另一条北极途径是通过冷冻过程中的分馏作用。也就是说，海冰被耗尽，由此产生的卤水富含铝。这些测量将在1993年夏季德国极地科考船Polarstein号的一次巡航中进行，这是一项广泛的物理和化学观测计划的一部分。将提供一个特殊的水文数据框架，用于解释和分析这些地球化学测量结果。

This project is an examination of the geochemistry of naturally occurring trace elements in the Arctic Ocean. The primary trace element is aluminum, but measurements of iron, beryllium, and selenium will also be made. The objective is to determine the magnitude, variability, and source of aluminum enrichment of the shelf brines in the Barents, Kara, and Laptev Seas, and to use these results to infer hydrographic processes of the eastern Arctic Ocean. The Norwegian and Greenland Seas have a dissolved aluminum concentration that is considerably higher than expected from the exchange of water masses, pointing to a regional external source of aluminum. While the normal pathways are the dissolution of aluminum carried through the atmosphere and deposited at the surface, and through river discharge, an additional arctic pathway is by fractionation in the freezing process. That is, sea ice is depleted and the resulting brine is enriched in aluminum. The measurements will be made on a Summer 1993 cruise of the German polar research vessel POLARSTERN as part of a wide-ranging physical and chemical observing program. An exceptional framework of hydrographic data will be available for the interpretation and analysis of these geochemical measurements.