Atmospheric Dust and Irradiation effects on Ocean Surface processes - Biogeochemistry in the Atlantic Ocean (ADIOS-BAO)

要求为参加定于2010年4月至5月从蓬塔阿雷纳斯到不来梅港的极地探险ANTXXVI-4提供资金。这次巡航将提供进一步的机会，继续正在进行的研究微量元素的气溶胶沉积到公海及其对海洋生物地球化学循环的影响。我们建议与国家和国际伙伴合作，评估气溶胶沉降和辐照对P、N、Fe、Al和Ti近地表生物地球化学的综合影响。拟议的样带跨越了可能受到巴塔哥尼亚和撒哈拉沙尘源影响的地区，提供了比较海洋对这些不同气溶胶源的反应的机会。我们的工作重点是每天同时收集大气气溶胶和表层海水样本，沿着轨道，在海上和基尔实验室进行分析。在每个日常站点，船上将测量近地表水中的彩色溶解有机物（CDOM）、磷酸盐、铁、铝、钛和瞬时氧化还原物质铁（ll）和H2O2，以检查沿样带的灰尘供应和辐射的影响。具体的海上实验将侧重于每日取样的气溶胶与新收集的海水的瞬间溶解。额外的长期实验将利用撒哈拉和巴塔哥尼亚的存档尘埃源，以及在航行期间从不同地区收集的清洁海水，以评估溶解过程中可能存在的区域差异。

Funding is requested for participation in the Polarstern expedition ANTXXVI-4 from Punta Arenas to Bremerhaven scheduled for Apr-May 2010. This cruise will provide a further opportunity to continue ongoing studies into the aerosol deposition of trace elements to the open ocean and its effect on ocean biogeochemical cycles. In cooperation with national and intemational partners we propose to assess the combined impacts of aerosol deposition and irradiation on the near surface biogeochemistries of P, N, Fe, Al and Ti. The proposed transect crosses regions potentially influenced by dust sources from Patagonia and the Sahara, providing the opportunity to compare the oceanic response to these different aerosol sources. Our work will focus on the simultaneous daily collection of atmospheric aerosols and surface seawater samples, along the cmise track, for analysis at sea and in the laboratory in Kiel. At each daily station, shipboard measurements will be made of coloured dissolved organic matter (CDOM), phosphate, Fe, Al, Ti and the transient redox species Fe(ll) and H2O2 in near surface waters to examine the influence of dust supply and irradiation along the transect. Specific at sea experiments will focus on the instantaneous dissolution ofthe daily sampled aerosols with freshly collected seawater. Additional longer term experiments will utilize archived dust sources from the Sahara and Patagonia with clean seawater collected from different regions during the voyage to assess possible regional differences in the dissolution processes.