Iron biogeochemistry in Antarctic pack ice during SIPEX-2

被引：39
作者：
Lannuzel, Delphine [1 ,2 ]
Chever, Fanny [3 ]
van der Merwe, Pier C. [2 ]
Janssens, Julie [1 ]
Roukaerts, Arnout [4 ]
Cavagna, Anne-Julie [4 ]
Townsend, Ashley T. [5 ]
Bowie, Andrew R. [1 ,2 ]
Meiners, Klaus M. [2 ,6 ]
机构：
[1] Univ Tasmania, Inst Marine & Antarctic Studies, Locked Bag 129, Hobart, Tas 7001, Australia
[2] Univ Tasmania, Antarctic Climate & Ecosyst CRC, Private Bag 80, Hobart, Tas 7001, Australia
[3] Univ Southampton, Natl Oceanog Ctr Southampton, Ocean & Earth Sci, Southampton SO14 3ZH, Hants, England
[4] Vrije Univ Brussel, Analyt Environm & Geochem, Pleinlaan 2, B-1050 Brussels, Belgium
[5] Univ Tasmania, Cent Sci Lab, Private Bag 74, Hobart, Tas 7001, Australia
[6] Australian Antarctic Div, 203 Channel Highway, Kingston, Tas 7050, Australia
来源：
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY | 2016年 / 131卷
基金：
澳大利亚研究理事会;
关键词：
Sea ice; Iron; Antarctica; Southern Ocean; Primary production; SEA-ICE; SOUTHERN-OCEAN; EAST ANTARCTICA; ROSS SEA; CARBON; DISTRIBUTIONS; PHYTOPLANKTON; FERTILIZATION; SURFACE; CIRCULATION;
D O I：
10.1016/j.dsr2.2014.12.003
中图分类号：
P7 [海洋学];
学科分类号：
0707 ;
摘要：
Our study quantified the spatial and temporal distribution of Fe and ancillary biogeochemical parameters at six stations visited during an interdisciplinary Australian Antarctic marine science voyage (SIPEX-2) within the East Antarctic first-year pack ice zone during September-October 2012. Unlike previous studies in the area, the sea ice Chlorophyll a, Particulate Organic Carbon and Nitrogen (POC and PON) maxima did not occur at the ice/water interface because of the snow loading and dynamic processes under which the sea ice formed. Iron in sea ice ranged from 0.9 to 17.4 nM for the dissolved ( < 0.2 mu m) fraction and 0.04 to 990 nM for the particulate ( > 0.2 mu m) fraction. Our results highlight that the concentration of particulate Fe in sea ice was highest when approaching the continent. The high POC concentration and high particulate iron to aluminium ratio in sea ice samples demonstrate that 71% of the particulate Fe was biogenic in composition. Our estimated Fe flux from melting pack ice to East Antarctic surface waters over a 30 day melting period was 0.2 mu mol/m(2)/d of DFe, 2.7 mu mol/m(2)/d of biogenic PFe and 1.3 mu mol/m(2)/d of lithogenic PFe. These estimates suggest that the fertilization potential of the particulate fraction of Fe may have been previously underestimated due to the assumption that it is primarily lithogenic in composition. Our new measurements and calculated fluxes indicate that a large fraction of the total Fe pool within sea ice may be bioavailable and therefore, effective in promoting primary productivity in the marginal ice zone. (C) 2014 The Authors. Published by Elsevier Ltd.
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收藏
页码：111 / 122
页数：12
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