首页|The connection of phytoplankton biomass in the Marguerite Bay polynya of the western Antarctic Peninsula to the Southern An-nular Mode

The connection of phytoplankton biomass in the Marguerite Bay polynya of the western Antarctic Peninsula to the Southern An-nular Mode

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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.

Marguerite Bay polynyaphytoplankton biomassSouthern Annular Modemixed layer depthinterannual variation

Ning Jiang、Zhaoru Zhang、Ruifeng Zhang、Chuning Wang、Meng Zhou

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School of Oceanography,Shanghai Jiao Tong University,Shanghai 200240,China

Key Laboratory for Polar Science,Polar Research Institute of China,Ministry of Natural Resources,Shanghai 200136,China

Key Research&Development Program of the Ministry of Science and Technology of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFund of Shanghai Science and Technology CommitteeFund of Shanghai Science and Technology CommitteeImpact and Response of Antarctic Seas to Climate Change funded by the Chinese Arctic and Antarctic AdministrationNational Key Research and Development Program of ChinaShanghai Pilot Program for Basic Research—Shanghai Jiao Tong University

2022YFC280760141941008418762212023071110021QA1404300IRASCC 1-02-01B2019YFC150910221TQ1400201

2024

10.1007/s13131-023-2201-y

海洋学报(英文版)
中国海洋学会

海洋学报(英文版)

CSTPCD
影响因子：0.323
ISSN：0253-505X
年,卷(期)：2024.43(1)
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