南极普里兹湾及其邻近海域悬浮颗粒有机物的碳同位素组成及其影响因素

任春燕; 陈敏; 高众勇; 郭劳动; 贾仁明; 刘萧; 邱雨生; 郑敏芳

doi:10.3969/j.issn.0253-4193.2015.12.008

南极普里兹湾及其邻近海域悬浮颗粒有机物的碳同位素组成及其影响因素

doi: 10.3969/j.issn.0253-4193.2015.12.008

1.
厦门大学海洋与地球学院, 福建厦门 361102
2.
厦门大学海洋与地球学院, 福建厦门 361102;厦门大学近海海洋环境科学国家重点实验室, 福建厦门 361102
3.
国家海洋局第三海洋研究所大气与全球变化重点实验室, 福建厦门 361005
4.
厦门大学海洋与地球学院, 福建厦门 361102;美国威斯康星大学水科学学院, 密尔沃基 WI 53204

基金项目: 南北极环境综合考察与评估专项(CHINARE01-04-03,04-01-06,04-04,04-03-05);国家自然科学基金杰出青年基金项目(41125020)。

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出版历程
- 收稿日期: 2015-09-30
- 修回日期: 2015-10-18

Stable carbon isotopic composition of suspended particulate organic matter in the Prydz Bay and its adjacent areas

1.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
2.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China;State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China
3.
Key Lab of Global Change and Marine-Atmospheric Chemistry, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
4.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China;School of Freshwater Sciences, University of Wisconsin-Milwaukee, WI 53204, USA

摘要

摘要: 依托中国第29次南极科学考察航次开展了南大洋普里兹湾及其邻近海域悬浮颗粒有机物碳同位素组成(δ¹³C_POC)的研究,结合温度、盐度、营养盐和溶解CO₂的数据,揭示了影响研究海域颗粒有机物碳同位素组成的主控因素,计算出混合层中浮游植物吸收无机碳过程的碳同位素分馏因子。结果表明,普里兹湾及其邻近海域的δ¹³C_POC介于-28.5‰~-21.1‰,平均值为-24.6‰,表现出湾内大于湾外的特征。浮游植物同化吸收CO₂过程的碳同位素分馏是影响研究海域混合层δ¹³C_POC的主要因素,根据δ¹³C_POC和1/[CO_2(aq)]的线性拟合关系,计算出浮游植物同化吸收CO₂过程的碳同位素分馏因子ε_p为23.4‰。δ¹³C_POC的垂直分布随深度增加而增大,反映出颗粒有机物垂向输送过程中颗粒有机物再矿化过程同位素分馏作用的影响。
- 悬浮颗粒有机物 /
- δ¹³C_POC /
- 碳同位素分馏因子 /
- 南极普里兹湾
Abstract: To better understand carbon and particle dynamics in the Prydz Bay and its adjacent areas,stable carbon isotopic composition in suspended particulate organic matter(POM) along with aqueous CO₂,nutrients and hydrographic data were measured to examine the spatial and vertical distributions of δ¹³C_POC and their controlling factors during the 29^th Chinese Antarctic Research Expedition. Furthermore,carbon isotope fractionation factor during the assimilation of dissolved inorganic carbon(DIC) by phytoplankton in the mixed layer was estimated. Our results showed that δ¹³C_POC ranged from-28.5‰ to-21.1‰ with an average of-24.6‰,showing an increase trend from the inner bay to open waters outside the Bay. Carbon isotope fractionation factor during phytoplankton DIC assimilation in the mixed layer was estimated to be 23.4‰ based on the relationship between δ¹³C_POC and 1/[CO_2(aq)],and was the major controlling factor for δ¹³C_POC values in the mixed layer in the Prydz Bay and its adjacent areas. Values of δ¹³C_POC increased in general with increasing depth in the study areas,ascribing to the isotope fractionation during POM remineralization.
- suspended particulate organic matter /
- δ¹³C_POC /
- isotope fractionation factor /
- Prydz Bay

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