极地研究

极地研究 ›› 2016, Vol. 28 ›› Issue (2): 211-218.DOI: 10.13679/j.jdyj.2016.2.211

• 研究论文 • 上一篇    下一篇

东南极夏季中山站邻近固定冰DMS、DMSP分布初探

张麋鸣,陈立奇,肖钲霖   

  1. 国家海洋局第三海洋研究所，福建 厦门 361005
  • 收稿日期:2015-01-20 修回日期:2015-04-16 出版日期:2016-06-30 发布日期:2016-06-30
  • 通讯作者: 陈立奇
  • 基金资助:
    南北极环境综合考察与评估专项项目;南大洋N2O源汇格局：驱动机制及其对海洋N2O收支的影响;南大洋海冰区二甲基硫海-气交换过程及其对含硫气溶胶组成的影响研究;国家海洋局极地考察办公室对外合作支持项目

Preliminary investigation of the distribution of dimenthylsulfide(DMS) and dimethylsulfoniopropionate(DMSP) in coastal fast ice near Zhongshan Station of East Antarctica during the austral summer

Mi-Ming ZHANG1,Liqi Chen2, 3   

  • Received:2015-01-20 Revised:2015-04-16 Online:2016-06-30 Published:2016-06-30
  • Contact: Liqi Chen

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摘要： 中国第30次南极考察期间, 在中山站邻近固定冰区采集了两根海冰冰芯并首次分析其中的DMS、DMSP含量。结果表明, 两根冰芯上层均含有较高浓度的DMSP+DMS, 分别高达114.93及134.41 nmol·L-1。冰芯中DMS、DMSP+DMS浓度随深度的增加而递减。两根冰芯顶部DMSP+DMS高值的成因不同, 冰芯1主要受藻类活动影响而产生DMSP+DMS高值, 冰芯2主要是由于雪层及薄冰层阻碍, 致使DMS在冰芯顶部聚集产生DMS高值。因为海冰底部较高生物量的海冰融化进入水体, 所观测的剩余海冰底部Chl a、DMSP+DMS值均较低。在海冰的融化过程中, 卤道内的卤水可发生垂向运输, 致使冰芯中Chl a、DMSP+DMS的垂直分布有所不同。冰芯的Chl a、DMSP+DMS总量分别为6.79和10.20、51.83和 88.41 μmol·m-2, 与前人研究结果比较, 在海冰融化过程中, 海冰中Chl a、DMSP+DMS总量变化的总趋势是递减的。

关键词: 海冰, 冰芯, 二甲基硫(DMS), 二甲基巯基丙酸(DMSP), 南极

Abstract: The distribution of dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) in ice cores was analyzed. The cores were drilled from coastal fast ice off Zhongshan station in East Antarctica during the 30th Chinese National Antarctic Research Expedition. The highest concentrations of DMSP + DMS were 114.93 nM and 134.41 nM, observed in the top layer of two ice cores. Both DMS and DMSP + DMS concentrations decreased from the top to bottom of the ice cores. There were two different factors controlling DMSP + DMS in the upper layer of the ice cores; one was related to algal assemblages, and the other was related to DMS accumulation in the slush layer. This DMS accumulation occurs because the ice and snow layer covering the sea ice blocks the emission of DMS into the atmosphere. Concentrations of chlorophyll a (Chl a) and DMSP + DMS were low in the bottom of ice cores because the bottom layer of sea ice with high biomass melts during the summer. During the sea ice melting season, gravity-related drainage of brine could alter the vertical distribution of Chl a and DMSP + DMS. The integrated Chl a and DMSP + DMS in ice cores analyzed during the present study (6.79–10.20 mg·m-2 and 51.83–88.41 μmol·m-2, respectively) were low compared with previous studies, indicating that the melt process could lead to a decline in biomass and DMSP + DMS in ice cores.

Key words: sea ice, ice core, dimethylsulfide（DMS）, dimethylsulfoniopropionat(DMSP), Antarctica