Perspective of biological pump and carbon sink in a freshening and warming Arctic Ocean based on six “Chinare” cruises since 1999

Lead Author Jianfang, Chen
Institution Contact Second Institute of Oceanography, SOA, 36 Baochubeilu, Hangzhou 310012, China
Co-Authors Haiyan Jin, Second Institute of Oceanography, SOA; Yanpei Zhuang, Second Institute of Oceanography, SOA; Hongliang Li, Second Institute of Oceanography, SOA; Youcheng Bai, Second Institute of Oceanography, SOA;
Theme Theme 1: Vulnerability of Arctic Environments
Session Name 1.2 Fresh Water in the Arctic Climate System: Consequences of Global Climate Change and Future Projections of the Arctic Environment
Datetime Thu, Sep 15, 2016 01:00 PM - 01:15 PM
Presentation Type Oral
Abstract text With decreasing of ice cover there is the potential for deepening of nutricline and an increasing of biological pump in the Arctic Ocean because of more nutrients in the euphotic zone will be consumed in an ice free sea or open ocean. On the other hand, freshening and warming of surface water will also lead to change of uptake of carbon dioxide from a physical chemistry view. Since 1999 (in summers, 1999, 2003, 2008, 2010, 2012, 2014), based on Icebreaker Xuelong, six Chinese Arctic Expeditions (Chinare) been carried out in Chukchi Sea and Canadian Basin where upper ocean nutrients are abundant compared with European sector of the Arctic Ocean. During those cruises, we analyzed nutrients, DO, pH, pCO2, chl a, opal in the water column as well as organic carbon and biomarkers in a 3.6m sedimentary core in order to check how biological pump changes with decreasing of sea ice. The results showed that biological pump and carbon sink dramatically increased since the last two decades in the west Arctic Ocean. Sedimentary records also support that organic carbon burial has been increased since last 250a in Chukchi Sea.
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