Ice sheets as a significant source of highly reactive nanoparticulate iron to the oceans.
Ice sheets as a significant source of highly reactive nanoparticulate iron to the oceans.
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DOI：
10.1038/ncomms4929
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发表时间：
2014-05-21
影响因子：
16.6
通讯作者：
Telling, Jon
中科院分区：
文献类型：
--
作者：
Hawkings, Jon R.;Wadham, Jemma L.;Tranter, Martyn;Raiswell, Rob;Benning, Liane G.;Statham, Peter J.;Tedstone, Andrew;Nienow, Peter;Lee, Katherine;Telling, Jon
格陵兰岛和南极冰盖覆盖了全球陆地表面的约10%，但很少被认为是全球铁循环的活跃组成部分。两个冰原周围的海水孕育着高产的沿海生态系统，其中许多是铁有限的。对格陵兰大冰盖集水区冰下径流中铁浓度的测量显示，全球范围内不稳定铁组分可能大量出口到近海岸的泛光带。我们估计，与冰川径流相关的生物可利用铁通量在格陵兰岛为每年0.40-2.54 Tg，在南极洲为每年0.06-0.17 Tg。铁通量主要是一种高活性和潜在生物可利用的纳米颗粒悬浮沉积物组分，类似于在南极冰山中发现的组分。融水中不稳定铁通量的估计值与格陵兰岛和南极洲周围海洋的风沙通量相当，并且在气候变暖、融化加剧的情况下，预计同样会增加。冰川融水可能有助于给铁含量有限的极地海洋施肥，但这种贡献受到的限制很少。hawkins等人在格陵兰岛的完全融化季节监测铁通量，并提出冰盖提供高度活性和潜在生物可利用的铁，可与风沙通量相媲美。
The Greenland and Antarctic Ice Sheets cover ~\n10% of global land surface, but are rarely considered as active components of the global iron cycle. The ocean waters around both ice sheets harbour highly productive coastal ecosystems, many of which are iron limited. Measurements of iron concentrations in subglacial runoff from a large Greenland Ice Sheet catchment reveal the potential for globally significant export of labile iron fractions to the near-coastal euphotic zone. We estimate that the flux of bioavailable iron associated with glacial runoff is 0.40–2.54 Tg per year in Greenland and 0.06–0.17 Tg per year in Antarctica. Iron fluxes are dominated by a highly reactive and potentially bioavailable nanoparticulate suspended sediment fraction, similar to that identified in Antarctic icebergs. Estimates of labile iron fluxes in meltwater are comparable with aeolian dust fluxes to the oceans surrounding Greenland and Antarctica, and are similarly expected to increase in a warming climate with enhanced melting. Glacial meltwaters may help fertilize the iron-limited Polar Oceans, yet the contribution is poorly constrained. Hawkings et al. monitor iron fluxes during a full-melt season in Greenland, and propose that ice sheets provide highly reactive and potentially bioavailable iron, comparable with aeolian dust fluxes.
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影响因子：
3.2
作者：
Bottrell, SH;Tranter, M
通讯作者：
Tranter, M
影响因子：
3
作者：
Lannuzel, Delphine;Schoemann, Veronique;Chou, Lei
通讯作者：
Chou, Lei
影响因子：
5.8
作者：
Cowton, T.;Nienow, P.;Mair, D.
通讯作者：
Mair, D.
DOI：
10.1016/j.dsr.2010.01.003
发表时间：
2010-04-01
影响因子：
2.4
作者：
Frajka-Williams, Eleanor;Rhines, Peter B.
通讯作者：
Rhines, Peter B.
影响因子：
4
作者：
Lowe, AL;Anderson, JB
通讯作者：
Anderson, JB