Ning Jiang, Zhaoru Zhang, Ruifeng Zhang, Chuning Wang, Meng Zhou
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引用次数: 0
摘要
南极沿岸多水层是南大洋的生物热点,它支持高营养级捕食者的大量繁殖,对高纬度海洋的碳循环非常重要。在这项研究中,我们考察了南极半岛西部玛格丽特湾多尼亚(MBP)夏季浮游植物生物量的年际变化,并将这种变化与主导南半球外热带气候变化的南环流模式(SAM)联系起来。结合卫星数据、大气再分析产品和数值模拟,我们发现甲基溴海湾夏季叶绿素-a(Chl-a)浓度的年际变化与春季 SAM 指数呈显著负相关,与夏季 SAM 指数呈弱相关。夏季叶绿素-a 与春季 SAM 指数呈负相关的原因是,在 SAM 指数较正的情况下,春季垂直混合较弱,从而抑制了深层铁元素向表层透光层的供应。春季混合和春季 SAM 之间的负相关关系是由于在正 SAM 阶段 MBP 区域的降水量较大,导致海洋表层盐度较低。本研究揭示的 SAM 与浮游植物生物量之间的物理-生物耦合机制对我们预测气候变化下南极多沼泽浮游植物生物量的未来变化具有重要意义。
The connection of phytoplankton biomass in the Marguerite Bay polynya of the western Antarctic Peninsula to the Southern Annular Mode
Antarctic coastal polynyas are biological hotspots in the Southern Ocean that support the abundance of high-trophic-level predators and are important for carbon cycling in the high-latitude oceans. In this study, we examined the interannual variation of summertime phytoplankton biomass in the Marguerite Bay polynya (MBP) in the western Antarctic Peninsula area, and linked such variability to the Southern Annular Mode (SAM) that dominated the southern hemisphere extratropical climate variability. Combining satellite data, atmosphere reanalysis products and numerical simulations, we found that the interannual variation of summer chlorophyll-a (Chl-a) concentration in the MBP is significantly and negatively correlated with the spring SAM index, and weakly correlated with the summer SAM index. The negative relation between summer Chl-a and spring SAM is due to weaker spring vertical mixing under a more positive SAM condition, which would inhibit the supply of iron from deep layers into the surface euphotic layer. The negative relation between spring mixing and spring SAM results from greater precipitation rate over the MBP region in positive SAM phase, which leads to lower salinity in the ocean surface layer. The coupled physical-biological mechanisms between SAM and phytoplankton biomass revealed in this study is important for us to predict the future variations of phytoplankton biomasses in Antarctic polynyas under climate change.
期刊介绍:
Founded in 1982, Acta Oceanologica Sinica is the official bi-monthly journal of the Chinese Society of Oceanography. It seeks to provide a forum for research papers in the field of oceanography from all over the world. In working to advance scholarly communication it has made the fast publication of high-quality research papers within this field its primary goal.
The journal encourages submissions from all branches of oceanography, including marine physics, marine chemistry, marine geology, marine biology, marine hydrology, marine meteorology, ocean engineering, marine remote sensing and marine environment sciences.
It publishes original research papers, review articles as well as research notes covering the whole spectrum of oceanography. Special issues emanating from related conferences and meetings are also considered. All papers are subject to peer review and are published online at SpringerLink.