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Coupling and feedback between iron and sulphur in air-sea exchange

Chinese Science Bulletin 2003年第11期48卷 1080-1086页

作者： ZHUANG Guoshun GUO Jinghua YUAN Hui ZHANG Xingying The Center for Atmospheric Environmental Study Beijing Normal UniversityThe Center for Atmospheric Environmental Study Beijing Normal UniversityThe Center for Atmospheric Environmental Study Beijing Normal UniversityThe Center for Atmospheric Environmental Study Beijing Normal University Beijing 100875 China Beijing 100875 China Beijing 100875 China Beijing 100875 China

Iron in surface seawater has been demonstrated to be the limiting nutrient factor for primary productivity in certain oceanic regions. In 1992 we reported in Nature at first Fe(II) existence in marine aerosols over the remote Pacific and Atlantic and proposed the hypothesis of coupling and feedback between iron and sulfur in air-sea exchange. We recently detected a considerable amount of Fe(II) in the aerosols collected during dust storm in Beijing. The concentration of Fe(II) in the dust storm was as high as 1.8-4.3 μg · m -3 that accounted for 1.4%-2.6% of the total Fe mass concentration in aerosols, while Fe(II) in the aerosols collected from non-dust storm days was 0.7% of the total Fe. Fe and S concentrations in the dust storm aerosol samples represent a very positive correlationship. The size distribution of Fe, Fe(II), and S in either dust storm particles or the normal aerosols showed the same peak at 1-3 μm. The oxidation of S(IV) under natural light and UV in addition of Fe(III) was 6.5 and 14 times faster respectively compared with that of non-addition. The photoreduction of Fe(III) to Fe(II), through the formation of an OH. radical, associated with the oxidation of S(IV) to S(VI) could account for ∼3%-20% of the formation of non-sea salt sulfate aerosols at Midway, central Pacific. These results further support the Fe-S coupling hypothesis. From consideration of both the marine biological production of dimethylsulphide (DMS) and the subsequent oxidation of reduced forms of sulfur in the atmosphere, the iron and sulphur cycles in both the atmosphere and the ocean may be closely coupled.

关键词：铁元素海空交换沙尘暴硫元素氧化硫气溶胶海洋天气

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