摘要
北极海冰消退造成了开阔水域面积的增加,进而促进表层海水吸收更多的二氧化碳(CO_(2)),导致表层CO_(2)分压(pCO_(2))呈上升趋势。然而,目前还缺少对于海冰消退过程中pCO_(2)的显著变化及其与海冰联系的相关研究。本研究基于2008年中国第三次北极科学考察数据,发现西北冰洋夏季海表pCO_(2)的分布呈现出陆架区低海盆区高的特征,整个海区总体上为大气CO_(2)的汇,其中陆架区碳汇通量为13.8 mmol·m^(-2)·d^(-1),而广阔的加拿大海盆区仅为3.7 mmol·m^(-2)·d^(-1)。本研究重点分析了海盆区高pCO_(2)和低碳汇的驱动机制,根据质量平衡模型模拟了加拿大海盆区在整个海冰融化过程以及随开阔海域时间延长的情景下,海表pCO_(2)的响应变化趋势。结果表明:(1)在融冰过程中,海-气CO_(2)交换驱动pCO_(2)呈缓慢增加趋势;(2)在海冰完全融化后,伴随着海面暴露在空气中时间的延长,海-气CO_(2)交换与升温共同作用使pCO_(2)迅速增加,且增加速率高于融化阶段。
Sea ice retreat in the Arctic Ocean has caused an increase in open water area,which has consequently contributed to the absorption of more carbon dioxide(CO_(2))by surface seawater,and an increase in the partial pressure of CO_(2)(pCO_(2)).However,there is a lack of research on the dramatic changes in pCO_(2)during sea ice retreat and its interaction with sea ice.Based on the 3rd Chinese National Arctic Research Expedition data in 2008,this study found that the distribution of summer sea surface pCO_(2)in the western Arctic Ocean was characterized by low values on the shelf and high values in the ocean basin.The study area overall was a sink for atmospheric CO_(2),with air-sea CO_(2)fluxes of 13.8 mmol·m^(-2)·d^(-1)in the shelf area and 3.7 mmol·m^(-2)·d^(-1)in the basin.This study used a mass balance model to investigate the response of sea surface pCO_(2)in the Canadian Basin during the whole period of sea ice melting process.The results showed that:(1)during the melting process,pCO_(2)slowly increased by air-sea CO_(2)exchange;(2)after the sea ice had completely melted and with prolonged exposure of the sea surface to the air,the combined effects of air-sea CO_(2)exchange and warming resulted in a rapid increase in pCO_(2),and the rate of increase was higher than that in the melting stage.
作者
赵雨
杨威
吴瀛旭
金梅兵
祁第
Zhao Yu;Yang Wei;Wu Yingxu;Jin Meibing;Qi Di(Marine Science College,Nanjing University of Information Science&Technology,Nanjing 210044,China;Polar and Marine Research Institute,Jimei University,Xiamen 361021,China)
出处
《极地研究》
CAS
CSCD
北大核心
2023年第4期499-507,共9页
Chinese Journal of Polar Research
基金
国家重点研发计划(2019YFE0114800,2019YFC1509101)
国家自然科学基金(42176230,41941013)
福建省自然科学基金(2022J06026,2019Jo5148)
中国科学院海洋大科学研究中心重点部署项目(COMS2020Q12)
南方海洋科学与工程广东省实验室(珠海)自主研发项目(SML2021SP306)资助。
