Characteristics of the horizontal and vertical distributions of dimethyl sulfide throughout the Amundsen Sea Polynya.
Characteristics of the horizontal and vertical distributions of dimethyl sulfide throughout the Amundsen Sea Polynya.
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DOI：
10.1016/j.scitotenv.2017.01.165
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发表时间：
2017-04
期刊：
影响因子：
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通讯作者：
Intae Kim;D. Hahm;Keyhong Park;Youngju Lee;J. Choi;Miming Zhang;Liqi Chen;Hyuncheol Kim;SangHoon Lee
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文献类型：
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作者：
Intae Kim;D. Hahm;Keyhong Park;Youngju Lee;J. Choi;Miming Zhang;Liqi Chen;Hyuncheol Kim;SangHoon Lee
利用韩国R/VAraon号破冰船上的膜入口质谱仪（MIMS）研究了2016年夏季（1 - 2月）阿蒙森海Polynya和松岛Polynya上层水柱中DMS的水平和垂直分布。地表水中DMS的浓度从< 1 nM到400 nM不等。最高的DMS（高达300 nM）在海冰-冰间湖过渡区和Getz冰架附近观察到，在那里观察到第一次当地冰融化和高浮游生物生产力。在其他地区，高DMS浓度通常伴随着较高的叶绿素和ΔO2/Ar。阿蒙森海表层水DMS和初级生产力的大的空间变异性似乎归因于海冰的融化条件，Phaeocystistica作为DMS生产者的相对优势，以及水华和随后DMS生产之间的时间差异。DMS和ΔO2/Ar的深度分布与水平面数据一致，具有明显的空间变异性。然而，尽管存在较大的空间变异性，但与2009年的先前结果相反，表层水中DMS浓度和ΔO2/Ar在两个主要区域（海冰区和冰穴区）之间的差异不明显。这种差异可能与浮游植物组合的年际变化有关，这些变化叠加在海冰条件、开花期和沿着阿蒙森海广阔表面积的空间覆盖范围的差异上。
We investigated horizontal and vertical distributions of DMS in the upper water column of the Amundsen Sea Polynya and Pine Island Polynya during the austral summer (January–February) of 2016 using a membrane inlet mass spectrometer (MIMS) onboard the Korean icebreaker R/VAraon. The surface water concentrations of DMS varied from < 1 to 400 nM. The highest DMS (up to 300 nM) were observed in sea ice–polynya transition zones and near the Getz ice shelf, where both the first local ice melting and high plankton productivity were observed. In other regions, high DMS concentration was generally accompanied by higher chlorophyll and ΔO2/Ar. The large spatial variability of DMS and primary productivity in the surface water of the Amundsen Sea seems to be attributed to melting conditions of sea ice, relative dominance ofPhaeocystisAntarcticaas a DMS producer, and timing differences between bloom and subsequent DMS productions. The depth profiles of DMS and ΔO2/Ar were consistent with the horizontal surface data, showing noticeable spatial variability. However, despite the large spatial variability, in contrast to the previous results from 2009, DMS concentrations and ΔO2/Ar in the surface water were indistinct between the two major domains: the sea ice zone and polynya region. The discrepancy may be associated with inter-annual variations of phytoplankton assemblages superimposed on differences in sea-ice conditions, blooming period, and spatial coverage along the vast surface area of the Amundsen Sea.