Distributions, sources, and transformations of dissolved and particulate iron on the R oss S ea continental shelf during summer Journal of Geophysical Research: Oceans

We report water column dissolved iron (dFe) and particulate iron (pFe) concentrations from 50 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, macronutrientdepletion, 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

本研究报道了2012年南半球夏季（1月至2月）于罗斯海（Ross Sea）50个采样站位获取的水柱溶解态铁（dissolved iron, dFe）与颗粒态铁（particulate iron, pFe）浓度数据。研究针对罗斯海各主要水团——包括冰架水（Ice Shelf Water）与陆架外缘环极深层水（off-shelf Circumpolar Deep Water）——测定了dFe与pFe浓度。尽管罗斯海陆架多个区域的水文特征、大量营养盐消耗状况与初级生产力存在显著横向差异，但表层水体中的dFe浓度始终处于较低水平（<0.1 nM），仅在海冰融化区域与富兰克林岛平台（Franklin Island platform）附近的少数站位出现浓度升高现象（0.20~0.45 nM）。在整个研究区域内，与悬浮生源物质结合的pFe约使表层水体中生物可利用铁的储量翻倍。本研究数据显示，夏季绝大多数的铁