南极半岛邻近海域夏季POC分布特征及其影响因素  

DISTRIBUTION OF SUMMER PARTICULATE ORGANIC CARBON AND FACTORS INFLUENCING IT IN THE OCEAN ADJACENT TO THE ANTARCTIC PENINSULA

作　　者：张一成 韩正兵 杨洋 潘建明 张海峰 李栋 赵军 朱秋红 范高晶 张海生 Zhang Yicheng;Han Zhengbing;Yang Yang;Pan Jianmin;Zhang Haifeng;Li Dong;Zhao Jun;Zhu Qiuhong;Fan Gaojing;Zhang Haisheng(Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China;Key Laboratory of Marine Ecosystem Dynamics,Ministry of Natural Resources,Hangzhou 310012,China)

机构地区：[1]自然资源部第二海洋研究所,浙江杭州310012 [2]自然资源部海洋生态系统动力学重点实验室,浙江杭州310012

出　　处：《极地研究》2020年第1期47-59,共13页Chinese Journal of Polar Research

基　　金：国家自然科学基金(41406219,41576186,41506223);国家海洋局第二海洋研究所基本科研业务费专项(JG1808,JG1805,JT1405);南北极环境综合考察与评估专项(CHINARE01-04,CHINARE01-03)联合资助。

摘　　要：海水中的颗粒有机碳(POC)与生物的生命过程、初级生产力关系密切,是海洋食物链中重要的物质基础和能量来源,因此POC的分布特征可以有效反映其生物地球化学环境。利用中国第33次南极考察期间(2016年12月至2017年1月)在南极半岛邻近海域采集的海水颗粒物样品,研究POC的空间分布特征及其影响因素。结果表明,斯科舍海0-200 m的POC浓度范围为7.44-193.52μg·L^-1,平均浓度为(48.84±35.09)μg·L^-1;南斯科舍海岭0-200 m的POC浓度范围为9.13-62.17μg·L^-1,平均浓度为(29.76±14.12)μg·L^-1;鲍威尔海盆0-200 m的POC浓度范围为5.87-270.72μg·L^-1,平均浓度为(48.57±38.92)μg·L^-1。表层POC高值出现在斯科舍海区和鲍威尔海盆区,而低值出现在海岭区,与叶绿素a(Chla)的变化趋势一致,与营养盐的变化趋势相反。垂向分布上,各个区域POC平均浓度随深度的增加而减少,鲍威尔海盆和斯科舍海POC最高值都出现在25 m层。分析结果表明光合浮游植物是研究海域POC的主要来源,POC的主要影响因素为温度、水团混合以及海冰环境。斯科舍海与鲍威尔海盆整体非生命POC占比高,可能是由于高磷虾生物量、海冰碎屑以及陆源输入的干扰;南斯科舍海岭整体非生命POC占比低。Particulate organic carbon(POC)is an important material and energy source for the marine food chain.Because of its close relationship with life processes and primary productivity,its distribution can effectively provide information on the biogeochemical environment.During the 33 rd CHINARE that took place between December 2016 and January 2017,suspended particulate matter samples were collected from the ocean adjacent to the Antarctic Peninsula to study POC distribution and factors influencing POC distribution.In the Scotia Sea,POC concentrations were between 7.44 and 193.52μg·L^-1,with a mean value of 48.84±35.09μg·L^-1;over South Scotia Ridge,concentrations were between 9.13 and 62.17μg·L^-1,with a mean value of 29.76±14.12μg·L^-1;in Powell Basin,concentrations were between 5.87 and 270.72μg·L^-1,with a mean value of 48.57±38.92μg·L^-1.In surface waters,high concentrations were found in Scotia Sea and Powell Basin while low concentrations were found over South Scotia Ridge;these results are consistent with variations in chlorophyll-a concentration,but are opposite to those in nutrient concentration.Concentrations of POC decreased with depth.In Powell Basin and Scotia Sea,the highest POC concentrations were found between the surface and a depth of 25 m.Results from principal component analysis show that photosynthetic phytoplankton is the main source of POC in the study area.Concentrations of POC were affected by temperature,water mass mixing and melting sea ice.Proportions of non-living POC were low over South Scotia Ridge;they were high in Scotia Sea and Powell Basin because of high krill biomass,sea ice debris and input from land-based sources.

关 键 词：南极半岛邻近海域 颗粒有机碳(POC) CHL a 营养盐 融冰 

分 类 号：P736.4[天文地球—海洋地质] Q178[天文地球—海洋科学]