Iron supply and demand in the upper ocean: Is extraterrestrial dust a significant source of bioavailable iron?

被引：51
|
作者：
Johnson, KS [1 ]
机构：
[1] Monterey Bay Aquarium Res Inst, Moss Landing, CA 95039 USA
来源：
GLOBAL BIOGEOCHEMICAL CYCLES | 2001年 / 15卷 / 01期
关键词：
D O I：
10.1029/2000GB001295
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Interplanetary dust particles accrete on the Earth at a rate of similar to 40 ktons yr(-1). Some 90% of this material evaporates in the atmosphere, producing a bioavailable iron flux of 3x10(-7) mol Fe m(-2) yr(-1). This extraterrestrial Fe flux is 30 - 300% of the eolian flux of bioavailable iron transported from terrestrial sources in remote marine regions and similar to 20% of the upwelled Fe flux in the Southern Ocean. Extraterrestrial Fe may play an important role in regulating the marine carbon cycle in these regions.
引用
收藏
页码：61 / 63
页数：3
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