Biogeochemical Cycling of Mercury in the North Atlantic Ocean

主题：北大西洋汞的生物地球化学循环本研究将探讨北大西洋汞的形态、分布和生物地球化学循环。海洋是大气汞的重要来源和汇，在全球汞循环中起着重要作用。由于缺乏关于开放海洋地区汞的分布和形态的信息，对汞在海洋环境中的行为和命运的认识受到阻碍。政府间海洋学委员会（海洋学委员会）于1993年6月/ 7月乘坐C.S.S.哈德逊号进行的痕量金属基线巡洋舰将提供基本数据，以及辅助的化学和物理海洋学方案，以补充和扩大以前关于汞的海洋研究，特别是在赤道太平洋的研究。船上将对活性汞和溶解气态汞（汞度和二甲基汞）进行分析。巡航后将对总汞、参与汞和单甲基汞进行分析。研究将集中在甲基化汞和元素汞的分布上，以确定这些化合物在表层和深海中的主要来源和汇。所获得的数据将允许检验目前关于公海中汞种类的来源和命运的假设，并将扩大对海洋在全球汞循环中的作用的理解。

Subject: Biogeochemical Cycling of Mercury In The North Atlantic Ocean This research will investigate the speciation, distribution and biogeochemical cycling of Hg in the North Atlantic Ocean. The ocean is an important source and sink for atmospheric Hg, and plays a significant role in the global Hg cycle. Knowledge of the behavior and fate of Hg in the marine environment is hindered by the lack of information on the distribution and speciation of Hg in open ocean regions. The Intergovernment Oceanographic Commission (IOC) Baseline Trace Metal cruise aboard the C.S.S. Hudson in June/July 1993 will provide essential data, as well as the supporting chemical and physical oceanographic program, to complement and extend previous oceanic studies of Hg, particularly those in the productive equatorial Pacific Ocean. Shipboard analyses will be made for reactive Hg, and dissolved gaseous species (Hg degree and dimethylHg). Post cruise analyses will be conducted for total Hg, participate Hg, and for monomethylHg. The research will focus on the distribution of methylated Hg species and elemental Hg in an effort to ascertain the principal sources and sinks for these compounds in the surface and deep ocean. The data obtained will allow the testing of current hypotheses concerning the sources and fate of Hg species in open ocean waters, and will broaden the understanding of the role of the ocean in the global Hg cycle.