Collaborative Research: Atmospheric Iron Inputs to the Sargasso Sea: Temporal Variability and Impact on Iron Distribution in the Upper Ocean

合作研究：马尾藻海的大气铁输入：时间变化及其对上层海洋铁分布的影响

• 批准号: 0222053
• 负责人: Peter Sedwick
• 金额: $ 28.86万
• 依托单位: Bermuda Institute of Ocean Sciences (BIOS), Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-15 至 2006-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0222053&HistoricalAwards=false
• 关键词: Collaborative; Research; Atmospheric; Iron; Inputs

ABSTRACTOCE-0222053OCE-0222046Although the gross features of atmospheric dust transport and deposition to the ocean are well established, major uncertainties remain on the effective solubility of the iron in the dust entering the ocean and the effects of these deposition on the distribution and speciation of iron in the upper ocean. A PI from the Bermuda Biological Station for Research and a PI from the University of Delaware will participate in two cruises to a site near BATS during summer months to obtain atmospheric and water column samples when dust inputs are at peak values. Atmospheric samples (precipitation and mineral aerosols) will be analyzed for total-dissolvable Fe and Al, as well as readily-soluble Fe and Fe(II). Seawater samples from the upper water column will be analyzed for total-dissolvable Fe and dissolved Fe and Fe(II) in the dissolved (0.4 um) colloidal (0.4-0.03 um) and soluble (0.03 um) phases. Results from this work will be used to determine the effect of atmospheric depositions on the distribution, speciation and biological availability of iron in the upper ocean.

尽管大气沙尘向海洋输送和沉积的总体特征已得到很好的证实，但关于进入海洋的尘埃中铁的有效溶解度以及这些沉积对上层海洋中铁的分布和形态的影响，仍然存在重大的不确定性。百慕大生物站的一名PI和特拉华大学的一名PI将在夏季参加两次邮轮，前往巴特斯附近的一个地点，在灰尘输入达到峰值时获取大气和水柱样本。将对大气样品(降水和矿物气溶胶)进行全溶Fe和Al以及易溶Fe和Fe(II)的分析。来自上层水柱的海水样品将在溶解(0.4微米)、胶体(0.4-0.03微米)和可溶(0.03微米)相中分析总溶解铁和溶解铁和铁(II)。这项工作的结果将用于确定大气沉积对上层海洋中铁的分布、形态和生物有效性的影响。