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二甲基硫(DMS)是一种重要的海洋生源硫化物,通过海—气交换进入大气后生成生物源硫酸盐气溶胶从而对气候产生影响。海洋是大气DMS的主要源地,海洋大气中约90%的DMS来自海洋。南大洋占世界大洋面积的20%,是全球DMS重要的源之一。相较其他海域,南大洋表层海水DMS存在显著的时空变化。由于南大洋复杂的水文环境、多变的海冰情况和受多种生物活动作用的影响,完全了解这一区域DMS海—气交换过程及其控制因素变得更加复杂、困难。此外,开展DMS的冰—气交换过程及其控制因素的研究也很有意义。为了便于今后在极区开展DMS海—气交换过程的研究,深入探究极区DMS的生物地球化学过程。因此,对南大洋DMS海—气通量的估算方法进行讨论,分析南大洋表层海水DMS的分布特征及南大洋DMS海—气输送通量,对南大洋DMS海—气交换过程的控制因素进行探讨。
Dimethylsulfide (DMS) is an important marine biosulfide that affects the climate by sea-gas exchange into the atmosphere to produce biogenic sulfate aerosols. The ocean is the main source of atmospheric DMS and about 90% of the DMS in the marine atmosphere comes from the ocean. Southern Ocean, accounting for 20% of the world’s oceanic area, is one of the most important sources of DMS in the world. Compared with other waters, there is a significant temporal and spatial variation of DMS in the surface water of the Southern Ocean. Due to the complex hydrological environment in the Southern Ocean, changing sea ice conditions and the effects of various biological activities, it is more complicated and difficult to fully understand the DMS sea-air exchange process and its controlling factors in this area. In addition, research on the ice-gas exchange process and its controlling factors for DMS is also of great significance. In order to facilitate the future study of DMS sea-gas exchange process in the polar region, the biogeochemical process of DMS in the polar region has been further explored. Therefore, the estimation method of DMS sea-gas flux in the Southern Ocean is discussed. The distribution characteristics of DMS in the surface ocean waters of the Southern Ocean and the DMS sea-gas transport flux in the Southern Ocean are analyzed to control the DMS sea-gas exchange process in the Southern Ocean Discussion.