极地研究

极地研究 ›› 2019, Vol. 31 ›› Issue (3): 322-333.DOI: 10.13679/j.jdyj.20180042

• 研究论文 • 上一篇    下一篇

南大洋净初级生产力的时空变化及影响因素分析

吴悦媛1  侯书贵1  吴霜叶1,2  庞洪喜1  刘科1  于金海1   

  1. 1.南京大学地理与海洋科学学院, 江苏 南京 210023;
    2.Department of Geology, University of Dayton, Dayton, OH 45469, USA
  • 收稿日期:2018-08-09 修回日期:2019-03-28 出版日期:2019-09-30 发布日期:2019-09-30
  • 通讯作者: 侯书贵
  • 基金资助:
    国家自然科学基金(41330526)资助

Analysis on spatiotemporal variation and influencing factors of net primary productivity in the Southern Ocean

Wu Yueyuan1, Hou Shugui1, Wu Shuangye1,2, Pang Hongxi1, Liu Ke1, Yu Jinhai1   

  • Received:2018-08-09 Revised:2019-03-28 Online:2019-09-30 Published:2019-09-30

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摘要： 南大洋作为全球大洋中重要的碳汇区, 分析其净初级生产力(NPP)的分布及变化趋势对气候变化研究具有重要的意义。利用2003—2016年的南大洋NPP数据分析其空间分布情况、季节变化特征及近期变化, 并结合海表面温度(SST)和海冰覆盖率(SIC)数据分析两者对NPP的影响。结果表明: ①南大洋不同海域年均NPP的范围为64.0—2.26×105 mg C·m–2·a–1, 印度洋扇区、大西洋扇区和太平洋扇区的NPP分别为0.568 Gt C·a–1、0.431 Gt C·a–1和0.262 Gt C·a–1; ②南大洋NPP在南极大陆近岸海域及威德尔海海域较低, 在低纬度岛屿附近和南极大陆部分冰架前缘海域较高; ③由于太阳辐射的季节变化, 南大洋NPP具有明显的季节变化规律, 1月份最高(293.27 Tg C), 6月份达到最低值(0.004 Tg C); ④2003—2016年大西洋扇区及太平洋扇区的NPP总量变化不具有统计学上的显著性, 只在印度洋扇区具有显著的上升趋势; ⑤不同扇区NPP的变化趋势主要与SST和SIC的变化有关。

关键词: 净初级生产力(NPP), 南大洋, 时空分布, 变化趋势, 影响因素

Abstract: It is important to investigate the spatiotemporal distribution and recent trend of net primary productivity (NPP) in the Southern Ocean because the region is the largest carbon sink within the global ocean. Based on NPP, sea surface temperature (SST) and sea ice concentration (SIC) data of the Southern Ocean during 2003–2016, the spatiotemporal distribution and recent trend of NPP in the Southern Ocean, and the correlation of both SST and SIC with NPP were analyzed. The results showed that annual average NPP within the study area was in the range 64.00–2.26 × 105 mg C m?2·a?1, and annual NPP of the Indian Ocean sector, Atlantic Ocean sector and Pacific Ocean sector was 0.568, 0.431 and 0.262 Gt C·a?1, respectively. In the Southern Ocean, NPP presented regional variation. For example, NPP around the Antarctic continent and in the Weddell Sea was low; however, areas near islands showed higher NPP. Moreover, high values were also found near the front of the ice shelf. Because of the seasonal change in solar radiation, NPP in the Southern Ocean has seasonal variation with highest (lowest) values in austral summer (winter). During 2003–2016, significant increase in NPP occurred only in the Indian Ocean sector. Furthermore, the trend of NPP in each sector was found correlated with the variation of SST and SIC.

Key words: NPP, Southern Ocean, spatiotemporal distribution, recent trend, influencing factors