Aerosol iron solubility over the Southern and Atlantic Oceans

南洋和大西洋上空的气溶胶铁溶解度

• 批准号: NE/E010180/1
• 负责人: Alexander Baker
• 金额: $ 5.35万
• 依托单位: University of East Anglia
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FE010180%2F1
• 关键词: Aerosol; iron; solubility; over; Southern

This project aims to study some important aspects of the influence of iron chemistry in the environment on the growth of microscopic plants (phytoplankton) in the ocean. Levels of iron in the ocean are extremely low and this poses a problem for phytoplankton, because iron is an essential component of many of their enzyme systems. Large amounts of iron get blown into the oceans from deserts around the world, but ocean areas a great distance from deserts receive very little of this iron. The Southern Ocean around Antarctica is one such area, where iron levels are so low that in vast areas the phytoplankton population is unable to use up large stores of nutrients such as nitrogen and phosphorus because they do have enough iron (they are iron-limited). Paradoxically, despite the importance of the Southern Ocean as an iron-limited region, it is probably the ocean region for which we have the least reliable information on iron inputs from the atmosphere. One of the goals of our project is therefore to collect samples of rain and aerosol during two research cruises that together will track from the southern tip of Africa to Antarctica, then west across a region of the Southern Ocean known as the Weddell Sea, and finally north to the tip of South America. A complicating factor in studying iron inputs to the ocean is that a large proportion of the iron that falls into the ocean in dust remains in the dust and simply falls to the seabed. Only the proportion of iron that dissolves in seawater is available for use by phytoplankton. Understanding what that soluble portion is, and what environmental factors control it, is a major challenge. Our second goal is to measure the soluble portion of iron in aerosol samples collected during the two Southern Ocean cruises and also in samples we have already collected during 11 other research cruises in other regions of the Atlantic Ocean. This large database will allow us to better understand how this key component of the Earth System functions and how iron deposited into the oceans can affect phytoplankton growth and climate.

该项目旨在研究环境中的铁化学对海洋中微型植物（浮游植物）生长的影响的一些重要方面。海洋中的铁含量极低，这对浮游植物造成了问题，因为铁是许多酶系统的重要组成部分。大量的铁从世界各地的沙漠被吹到海洋中，但是离沙漠很远的海洋区域接收到的铁很少。南极洲周围的南大洋就是这样一个地区，那里的铁含量非常低，以至于在广阔的地区，浮游植物种群无法消耗大量的营养物质，如氮和磷，因为它们确实有足够的铁（它们是铁有限的）。巧合的是，尽管南大洋作为一个铁有限区域的重要性，它可能是我们对来自大气的铁输入的可靠信息最少的海洋区域。因此，我们项目的目标之一是在两次研究航行中收集雨水和气溶胶样本，这两次研究航行将从非洲南端跟踪到南极洲，然后向西穿过南大洋的威德尔海，最后向北到达南美洲的尖端。在研究铁进入海洋的过程中，一个复杂的因素是，大部分福尔斯以灰尘的形式落入海洋的铁仍然留在灰尘中，只是福尔斯落入海底。只有溶解在海水中的铁的比例可供浮游植物使用。了解可溶部分是什么，以及什么环境因素控制它，是一个重大挑战。我们的第二个目标是测量在两次南大洋考察期间收集的气溶胶样品以及我们在大西洋其他区域的其他11次考察期间收集的样品中的铁可溶部分。这个大型数据库将使我们能够更好地了解地球系统的这一关键组成部分是如何运作的，以及沉积到海洋中的铁是如何影响浮游植物生长和气候的。

项目成果

Distributions of dissolved trace metals (Cd, Cu, Mn, Pb, Ag) in the southeastern Atlantic and the Southern Ocean

• DOI: 10.5194/bg-9-3231-2012
• 发表时间: 2012-01-01
• 期刊: BIOGEOSCIENCES
• 影响因子: 4.9
• 作者: Boye, M.;Wake, B. D.;Achterberg, E. P.
• 通讯作者: Achterberg, E. P.

Impact of atmospheric deposition on the contrasting iron biogeochemistry of the North and South Atlantic Ocean

• DOI: 10.1002/gbc.20056
• 发表时间: 2013-12
• 期刊: Global Biogeochemical Cycles
• 影响因子: 5.2
• 作者: S. Ussher;E. Achterberg;Claire F. Powell;A. Baker;T. Jickells;R. Torres;P. Worsfold

Atmospheric trace metal concentrations, solubility and deposition fluxes in remote marine air over the south-east Atlantic

• DOI: 10.1016/j.marchem.2015.06.028
• 发表时间: 2015-12-20
• 期刊: MARINE CHEMISTRY
• 影响因子: 3
• 作者: Chance, Rosie;Jickells, Timothy D.;Baker, Alex R.
• 通讯作者: Baker, Alex R.