Biogeochemistry: The great iron dump
Biogeochemistry: The great iron dump
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生物地球化学：大铁矿场
作者：
K. Buesseler
海藻水华将有机碳储存到深海的发现回答了一些问题，即为这种水华施肥是否是减缓气候变化的可行策略。见第313页
铁假说提出，向某些海洋地区供应含铁尘埃会刺激浮游植物大量繁殖，当生物死亡时，浮游植物会沉入深海，隔离与大气交换过程中吸收的碳。为测试这一想法而进行的实验提供了明确的证据，表明铁的添加会在高营养但低叶绿素浓度的水域产生浮游植物水华，正如所提出的那样。但浮游植物大量繁殖的命运，以及因此而向深海固碳的程度仍然不确定。这篇论文提供了多条证据，这些证据是在2004年欧洲铁肥实验(EIFEX)期间由RV Polarstein号收集的，表明由于铁肥的结果，碳被出口到深海，至少一半的水华生物量沉入1000米以下。
The discovery that marine algal blooms deposit organic carbon to the deep ocean answers some — but not all — of the questions about whether fertilizing such blooms is a viable strategy for mitigating climate change. See Article p.313
The iron hypothesis proposes that the supply of iron-bearing dust to certain oceanic regions stimulates phytoplankton blooms that, by sinking out to the deep ocean when the organisms die, sequester carbon absorbed from exchange with the atmosphere. Experiments carried out to test the idea have provided clear evidence that iron addition generates phytoplankton blooms in waters with high -nutrient but low -chlorophyll concentrations, as proposed. But the fate of phytoplankton blooms and hence the extent of any carbon sequestration to the deep ocean has remained uncertain. This paper presents multiple lines of evidence, collected by aboard RV Polarstern in 2004 during the European Iron Fertilization Experiment (EIFEX), that suggest carbon is exported to the deep ocean as a result of iron fertilization, with at least half of the bloom biomass sinking to below 1,000 metres.