Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro Nam-Gu, Pohang, 790-784, South Korea.
Princeton University/Atmospheric and Oceanic Sciences Program, Princeton, NJ, 08540, USA.
Sci Rep. 2021 May 13;11(1):10266. doi: 10.1038/s41598-021-89720-4.
Antarctic marine biological variability modulates climate systems via the biological pump. However, the knowledge of biological response in the Southern Ocean to climate variability still has been lack of understanding owing to limited ocean color data in the high latitude region. We investigated the surface chlorophyll concentration responses to the Southern annular mode (SAM) in the marginal sea of the Southern ocean using satellite observation and reanalysis data focusing on the austral summer. The positive phase of SAM is associated with enhanced and poleward-shifted westerly winds, leading to physical and biogeochemical responses over the Southern ocean. Our result indicates that chlorophyll has strong zonally asymmetric responses to SAM owing to different limiting factors of phytoplankton growth per region. For the positive SAM phase, chlorophyll tends to increase in the western Amundsen-Ross Sea but decreases in the D'Urville Sea. It is suggested that the distinct limiting factors are associated with the seasonal variability of sea ice and upwelling per region.
南极海洋生物变异性通过生物泵调节气候系统。然而，由于高纬度地区海洋颜色数据有限，人们对南大洋对气候变化的生物响应仍缺乏了解。我们利用卫星观测和再分析数据，重点研究了南大洋边缘海域夏季南极环状模（SAM）对表层叶绿素浓度的响应。SAM 的正相位与西风增强和向极移动有关，导致南大洋的物理和生物地球化学响应。我们的结果表明，由于每个区域浮游植物生长的限制因素不同，叶绿素对 SAM 表现出强烈的纬向非对称响应。对于正的 SAM 阶段，叶绿素在西部的阿蒙森-罗斯海趋于增加，而在德维尔海则减少。这表明，不同的限制因素与每个区域的海冰和上升流的季节性变化有关。
