Collaborative Research: Biogeochemistry of Trace Elements in the Western Pacific: Atmospheric Input and Upper Ocean Cycling

虽然以前在大西洋和阿拉伯海的研究已经证明了大气尘埃沉积和表面沃茨中活性微量元素添加之间的直接关系，但关于亚洲尘埃羽流对西北太平洋表面沃茨中活性微量元素分布的影响知之甚少。 因此，夏威夷大学、旧自治领大学和佛罗里达州立大学的专业研究员将于2002年4月/5月期间参加一次前往北太平洋中部和西部的巡航考察，这段时间正好是该区域亚洲沙尘最多的时间。 在这次航行中，将讨论以下四个研究目标：（1）利用地表水样品中溶解的铝浓度来量化该地区大气尘埃的面积范围和浓度，并将结果与2001年作为ACE-ASIA计划的一部分进行的实地研究中获得的估计值以及历史沉积模型进行比较;（2）比较气溶胶和雨水中生物活性痕量金属的溶解度沿着在地表水样品中的浓度和分布与Al值，以评估大气沉积在控制/改变这些元素的海洋地球化学循环中的作用;（3）确定大气输入物进入北太平洋温跃层和中央沃茨的程度和途径;（4）提供痕量金属的基线浓度。PI将在航行期间通过安装在改进的水深温度计上的聚四氟乙烯内衬聚乙烯管将水抽到船上，并在8个站收集表面样本，这些站将包括该地区的关键水文制度。 将分析样品（总样品、颗粒样品、溶解样品、胶体样品）中的金属Ag、Al、Cd、Cu、Co、Fe、Mn、Ni、Pb、Zn和准金属As、Sb、Se。还将收集气溶胶和降雨样本，分别分析金属/主要离子和金属/准金属。 此外，还将对选定的样品进行营养物、盐度、氧气、叶绿素a、颗粒有机碳、颗粒有机氮、颗粒有机硫、溶解有机碳和溶解有机氮的分析。

ABSTRACTOCE-0117917OCE-0117655OCE-0117648While previous studies in the Atlantic Ocean and Arabian Sea have documented a direct relationship between atmospheric dust deposition and reactive trace element additions to surface waters, little is known about the effect that the Asian dust plume has on the distribution of reactive trace elements in surface waters of the western North Pacific. For this reason, PIs from the University of Hawaii, Old Dominion University and Florida State University will participate in a cruise to the central and western North Pacific during April/May 2002, a time period coincident with maximum Asian dust over that region. During this cruise the following four research objectives will be addressed: (1) quantify the areal extent and concentration of atmospheric dust in this region using dissolved Al concentrations in surface water samples and compare results with estimates obtained during field studies carried out as part of the ACE-ASIA program in 2001, as well as historical deposition models; (2) compare the solubility of bioactive trace metals in aerosols and rainwater along with their concentration and distribution in surface water samples versus Al values to assess the role that atmospheric deposition has in controlling/altering the upper ocean biogeochemical cycles of these elements; (3) ascertain the magnitude and pathways via which atmospheric inputs get incorporated into the thermocline and central waters of the North Pacific; and (4) provide baseline concentrations for trace metals. The PIs will collect surface samples while underway by pumping water onto the ship through a Teflon-lined, polyethylene tube mounted on a modified bathythermograph and vertical profiles at 8 stations that will encompass the key hydrographic regimes of the area. Samples (total, particulate, dissolved, colloidal) will be analyzed for the metals Ag, Al, Cd, Cu, Co, Fe, Mn, Ni, Pb, Zn and the metalloids As, Sb, Se. Aerosols and rainfall samples also will be collected and analyzed for metals/major ions and metals/metalloids, respectively. In addition, selected samples also will be analyzed for nutrients, salinity, oxygen, chlorophyll a, particulate organic carbon, particulate organic nitrogen, particulate organic sulfur, dissolved organic carbon and dissolved organic nitrogen.