Changes in iron speciation following a Saharan dust event in the tropical North Atlantic Ocean
Changes in iron speciation following a Saharan dust event in the tropical North Atlantic Ocean
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热带北大西洋撒哈拉沙尘事件后铁形态的变化
DOI：
10.1016/j.marchem.2008.02.006
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发表时间：
2008
期刊：
影响因子：
3
通讯作者：
E. Achterberg
中科院分区：
文献类型：
--
作者：
M. Rijkenberg;Claire F. Powell;M. Dall’Osto;M. Nielsdóttir;M. Patey;Polly G Hill;A. Baker;T. Jickells;R. Harrison;E. Achterberg
2006年1-2月，作为UK-SOLAS(表层海洋低层大气研究)巡航海神332号(P332)的一部分，在热带东北大西洋(12-30°N，21-29°W)测定了溶解铁(DFE)和铁结合配体的浓度。地表水DFE浓度在0.1~0.4nM之间变化，平均为0.22±0.05nM(n=159)。总铁结合配体的地表水浓度在0.82~1.46nM之间变化，平均为1.11±0.14nM(n=33)。未络合的铁结合配体的浓度在0.64~1.35nM之间变化，平均0.90±0.14nM(n=33)。因此，平均81%的铁结合配体浓度是非络合的。铁结合库的平均对数条件稳定常数相对于Fe3+(n=33)为22.85±0.38。一个样带(12°N，26°W到16°N，25.3°W)在一次小撒哈拉沙尘事件期间航行，并在一周后重复。沙尘事件发生后，DFE浓度从0.20±0.026 nM(n=125)增加到0.25±0.028(n=17)，游离铁结合配体浓度从1.15±0.15(n=4)下降到0.89±0.10(n=4)。此外，佛得角群岛以南的铁结合配体的对数稳定常数明显低于群岛以北。佛得角群岛南部的沙尘事件发生后，对数稳定常数没有发生变化，这表明在这次沙尘事件期间，新的铁结合配体没有显著的大气输入。
Concentrations of dissolved iron (DFe) and Fe-binding ligands were determined in the tropical Northeast Atlantic Ocean (12–30°N, 21–29°W) as part of the UK-SOLAS (Surface Ocean Lower Atmosphere Study) cruise Poseidon 332 (P332) in January–February 2006. The surface water DFe concentrations varied between 0.1 and 0.4 nM with an average of 0.22±0.05 nM (n=159). The surface water concentrations of total Fe-binding ligands varied between 0.82 and 1.46 nM with an average of 1.11±0.14 nM (n=33). The concentration of uncomplexed Fe-binding ligands varied between 0.64 and 1.35 nM with an average of 0.90±0.14 nM (n=33). Thus, on average 81% of the total Fe-binding ligand concentration was uncomplexed. The average logarithmic conditional stability constant of the pool of Fe-binding ligands was 22.85±0.38 with respect to Fe3+(n=33). A transect (12°N, 26°W to 16°N, 25.3°W) was sailed during a small Saharan dust event and repeated a week later. Following the dust event, the concentration of DFe increased from 0.20±0.026 nM (n=125) to 0.25±0.028 (n=17) and the concentration of free Fe-binding ligands decreased from 1.15±0.15 (n=4) to 0.89±0.10 (n=4) nM. Furthermore, the logarithmic stability constants of the Fe-binding ligands south of the Cape Verde islands were distinctively lower than north of the islands. The absence of a change in the logarithmic stability constant after the dust event south of the Cape Verde islands suggests that there was no significant atmospheric input of new Fe-binding ligands during this dust event.
影响因子：
11.6
作者：
Moore, CM;Mills, MM;La Roche, J
通讯作者：
La Roche, J