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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Dimethyl sulfide in the Southern Ocean: Seasonality and flux
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Dimethyl sulfide in the Southern Ocean: Seasonality and flux

机译：南大洋中的二甲硫：季节性和通量

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The first flux estimate of dimethyl sulfide (DMS) from the Australian sector of the Southern Ocean (63 degrees E to 162 degrees E) has been calculated from seven voyages, which span spring and summer seasons from 1991 to 1995. Increases in seawater DMS and its precursor, dimethyl sulfoniopropionate (DMSP) generally occurred in Southern Ocean surface waters during the transition from spring to summer. DMS flux from the Subantarctic Zone (SAZ), Antarctic Zone (AZ), and Seasonal Ice Zone (SIZ) ranged from 1.7 to 49 mu mol/m(2)/d with a mean value of 9.4 mu mol/m(2)/d. These flux calculations are believed to be underestimates, and do not include potential contributions from sea ice. Very high levels of DMSP in sea ice suggest that the SIZ may be a source of DMS to the atmosphere. The different types of vertical DMSP profiles found in sea ice possibly reflect the type of algal assemblage present and the age of the sea ice. Without considering contributions of DMS from sea ice, the overall Southern Ocean DMS emission estimate from this work was 139 Gmol S/yr. The emission estimate for the Antarctic region alone (AZ and SIZ) was 85 Gmol S/yr. This represents 17% of the global emission estimate, from 6% of the ocean surface area. This emission estimate is almost double that of an earlier estimate by Berresheim [1987] of 48 Gmol S/yr, and is likely to be higher when the amount released from the sea ice surrounding Antarctica is more accurately characterized. [References: 39]
机译：从1991年至1995年的春季和夏季的7次航程中，计算了来自南大洋澳大利亚地区（63度至162度）澳大利亚二甲硫（DMS）的第一个通量估计值。其前体磺丙酸二甲酯（DMSP）通常在春季到夏季过渡期间发生在南大洋地表水域中。来自亚南极带（SAZ），南极带（AZ）和季节性冰带（SIZ）的DMS通量范围为1.7至49μmol/ m（2）/ d，平均值为9.4μmol/ m（2）。 / d。这些通量计算被认为是低估的，并且不包括海冰的潜在贡献。海冰中DMSP含量很高，表明SIZ可能是大气中DMS的来源。在海冰中发现的不同类型的垂直DMSP剖面可能反映了存在的藻类组合的类型和海冰的年龄。不考虑海冰中DMS的贡献，这项工作对南大洋DMS的总体排放估算为139 Gmol S / yr。仅南极地区（AZ和SIZ）的排放估算为85 Gmol S / yr。这占全球排放量估计值的17％（占海洋表面积的6％）。该排放估算几乎是Berresheim [1987]先前估算的48 Gmol S / yr的两倍，当更精确地表征南极周围海冰释放的量时，该排放估算可能会更高。 [参考：39]

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