Distributions, sources, and transformations of dissolved and particulate iron on the Ross Sea continental shelf during summer
Distributions, sources, and transformations of dissolved and particulate iron on the Ross Sea continental shelf during summer
复制标题
夏季罗斯海大陆架溶解铁和颗粒铁的分布、来源和转化
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
P. Sedwick
中科院分区：
文献类型：
--
作者：
C. Marsay;P. M. Barrett;D. McGillicuddy;P. Sedwick
我们报告了2012年夏季（1 - 2月）南侧罗斯海50个采样站的水柱溶解铁（dFe）和颗粒铁（pFe）浓度。在包括冰架水和非冰架环极深水在内的每个主要罗斯海水团中都测量了dFe和pFe的浓度。尽管在大陆架几个不同区域的水文、常量营养素消耗和初级生产力方面存在显著的横向变化，但地表水中的dFe浓度始终较低（<0.1 nM），只有少数站在海冰融化区域和富兰克林岛平台附近显示浓度升高（0.20-0.45 nM）。在整个研究区域，与悬浮生物源物质相关的pFe使地表水中生物可利用铁的存量大约增加了一倍。我们的数据显示，罗斯海夏季铁储量的大部分位于密集的大陆架水域，在距离海底50米的范围内浓度最高。海底附近较高的dFe浓度伴随着自生铁和/或清除铁对pFe的贡献增加。颗粒锰也受到海底附近沉积物再悬浮的影响，但与pFe不同的是，锰越来越多地与水柱中较高的自生物质有关。综上所述，这些结果表明，在冬季对流混合和海冰融化导致的dFe耗竭之后，上层水柱中pFe的再循环在维持罗斯海多冰区夏季浮游植物繁殖中起着重要作用。
We report water column dissolved iron (dFe) and particulate iron (pFe) concentrations from fifty stations sampled across the Ross Sea during austral summer (January-February) of 2012. Concentrations of dFe and pFe were measured in each of the major Ross Sea water masses, including the Ice Shelf Water and off-shelf Circumpolar Deep Water. Despite significant lateral variations in hydrography, macronutrient depletion and primary productivity across several different regions on the continental shelf, dFe concentrations were consistently low (<0.1 nM) in surface waters, with only a handful of stations showing elevated concentrations (0.20–0.45 nM) in areas of melting sea ice and near the Franklin Island platform. Across the study region, pFe associated with suspended biogenic material approximately doubled the inventory of bioavailable iron in surface waters. Our data reveal that the majority of the summertime iron inventory in the Ross Sea resides in dense shelf waters, with highest concentrations within 50 m of the seafloor. Higher dFe concentrations near the seafloor are accompanied by an increased contribution to pFe from authigenic and/or scavenged iron. Particulate manganese is also influenced by sediment resuspension near the seafloor but, unlike pFe, is increasingly associated with authigenic material higher in the water column. Together, these results suggest that, following depletion of the dFe derived from wintertime convective mixing and sea ice melt, recycling of pFe in the upper water column plays an important role in sustaining the summertime phytoplankton bloom in the Ross Sea polynya.
颗粒相是控制北大西洋（亚）热带溶解铁浓度的关键
影响因子：
5.2
作者：
Milne A
通讯作者：
Milne A
南极洲罗斯海浮游植物光合作用策略的时间进程
影响因子：
2.8
作者：
Ryan-Keogh T
通讯作者：
Ryan-Keogh T
DOI：
10.1016/j.dsr.2014.02.003
发表时间：
2014-05-01
影响因子：
2.4
作者：
Wadley, Martin R.;Jickells, Timothy D.;Heywood, Karen J.
通讯作者：
Heywood, Karen J.