Collaborative Research: Global Ocean Survey of Dissolved and Particulate Iron and Aluminum and Aerosol Iron and Aluminum Solubility Supporting the CLIVAR/Repeat Hydrography Project

佛罗里达州立大学的一名科学家和夏威夷大学的一名科学家将参加CLIVAR重复水文学计划的最后两次巡航，以采样具有特殊海洋意义的海洋的关键区域，这些区域以前在该计划期间没有进行过采样。第一段将是2011年的S4P，它将在东经160°到西经110°之间对一个通常难以接近的大片高营养低叶绿素区域进行采样，并涉及到进入南极沿海水域的至少三个经向断面，以及沿着大约67°S的纬向断面进行采样。第二段是重新占用位于约3°S至55°S之间的A16S，目前计划于2013年进行，并将完成大西洋段。水样将在常规CLIVAR团队占据的大约每个其他站点进行采集，采样深度为12到1000米。样本将在船上进行溶解的铁和铝、营养物质和盐度的分析。更多的样品将被储存、酸化，并在岸上使用电感耦合等离子体质谱(ICP-MS)分析锰、铁、钴、镍、铜、锌、镉和铅。在与美国地理痕迹指导委员会的合作下，将收集海水样本，供其他调查人员在岸上测定其他微量元素和同位素。此外，研究人员计划继续每日综合气溶胶和基于事件的降雨采样，使用现有的CLIVAR气溶胶和降雨采样设备，以及最近购买的大容量气溶胶采样设备和自动降雨收集器，用于美国地理跟踪计划。这将使我们能够向美国和国际“气雾剂社区”提供亚样本。气溶胶样品将用岸基电感耦合等离子体质谱分析超纯水溶、海水可溶和总微量元素。雨水样本将被过滤(对于大于200毫升的样本)，过滤和未过滤的子样本将被冷冻存储，用于岸基主要离子分析和电感耦合等离子体质谱痕量元素分析。至于更广泛的影响，作为CLIVAR重复水文计划的一部分获得的痕量金属数据集的可用性将增进我们对全球生物地球化学循环的了解，并将改善耦合的生物地球化学模型。这项研究的结果将被纳入课堂讲课。作为该项目的一部分，佛罗里达州立大学的一名博士后和一名研究生以及夏威夷大学的两名博士后将得到支持和培训。

A scientist from Florida State University and one from the University of Hawaii will participate in the final two cruises of the CLIVAR Repeat Hydrography program to sample critical regions of the oceans of particular oceanographic significance and have not been previously sampled during this program. The first section will be S4P in 2011 which will sample a large normally inaccessible High Nutrient Low Chlorophyll (HNLC) region between 160°E and 110°W and involve at least three meridional sections into Antarctic coastal waters as well sampling along a zonal transect at roughly 67°S. The second section is the reoccupation of A16S between ~3°S and 55° S, currently scheduled for 2013 and will complete the Atlantic section. Water samples will be collected at approximately every other station occupied by the regular CLIVAR team, sampling 12 depths to 1000m. The samples will be analyzed on-board for dissolved iron and aluminum, nutrients, and salinity. Additional samples will be stored, acidified, and analyzed on shore for manganese, iron, cobalt, nickel, copper, zinc, cadmium, and lead using inductively coupled plasma mass spectrometry (ICP-MS). In collaboration with the U.S. GEOTRACES steering committee, seawater samples will be collected for shore-based determination of other trace elements and isotopes by other investigators. In addition, the researchers plan to continue the daily-integrated aerosol and event-based rainfall sampling, using existing CLIVAR aerosol and rainfall sampling equipment, as well as the high-volume aerosol sampling equipment and automated rainfall collectors recently purchased for use in the U.S. GEOTRACES program. This will allow us to provide subsamples to the U.S. and international "aerosol community". The aerosol samples will be analyzed for ultrapure water soluble, seawater soluble, and total trace elements using shore-based ICP-MS. Rain samples will be filtered (for samples greater than 200mL volume) and filtered and unfiltered subsamples will be stored frozen for shore-based major ion analyses and ICP-MS trace element analysis.As regards broader impacts, availability of the trace metal dataset acquired as part of the CLIVAR Repeat Hydrography program will advance our knowledge of global biogeochemical cycles and will improve coupled biogeochemical models. Results from the study would be included into class lectures. One postdoc and one graduate student from Florida State University and two postdoc from the University of Hawaii will be supported and trained as part of this project.