Insights into the coupling of upper ocean-benthic carbon dynamics in the western Arctic Ocean from an isotopic (13C, 234Th) perspective
Insights into the coupling of upper ocean-benthic carbon dynamics in the western Arctic Ocean from an isotopic (13C, 234Th) perspective
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从同位素（13C，234Th）角度洞察北冰洋西部上层海洋-底栖碳动力学的耦合
DOI：
10.1007/s13131-015-0684-x
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发表时间：
2015-06
影响因子：
1.4
通讯作者：
Yusheng Qiu
中科院分区：
文献类型：
--
作者：
Min Chen;Qiang Ma;Jianping Cao;Yusheng Qiu
2003年7月下旬至9月上旬，利用天然稳定同位素（13 C）和放射性同位素（238 U-234 Th）示踪剂，对无冰西北冰洋（楚科奇海和加拿大海盆）上层海洋-底栖生物碳动力学的耦合进行了评价。根据234 Th/238 U不平衡和溶解CO2浓度（[CO2（aq）]）估算的POC输出通量指出，楚科奇陆架生物泵的加强显著降低了[CO2（aq）]，并改变了表层海洋碳固定过程中同位素（12 C/13 C）分馏的幅度。表层沉积物的δ 13 C（δ 13 Csed）与上层海洋的δ 13 CPOC（δ 13 Csed =13.64+1.56×δ 13 CPOC，r2=0.73，p0.01）具有显著的正相关<性，表明表层沉积物中记录了来自上层海洋的POC同位素信号。部分是由于颗粒的快速输出，如由来自上层水柱的高颗粒反应性234 Th的低停留时间所证明的。研究表明，北冰洋西部沉积物δ 13 C记录可能是古CO2的一个指示因子，可能存在上层海洋-底栖生物碳动力学耦合。
The coupling of upper ocean-benthic carbon dynamics in the ice-free western Arctic Ocean (the Chukchi Sea and the Canada Basin) was evaluated during the late July-early September 2003 using natural stable (13C) and radioactive (238U-234Th) isotope tracers. POC export flux estimated from 234Th/238U disequilibria and dissolved CO2 concentration ([CO2(aq)]) pointed out that the strengthened biological pump in the Chukchi Shelf have significantly lowered [CO2(aq)] and altered the magnitude of isotopic (12C/13C) fractionation during carbon fixation in the surface ocean. Further, δ13C signatures of surface sediments (δ13Csed) are positively correlated to those of weighted δ13CPOC in upper ocean (δ13Csed =13.64+1.56×δ13CPOC, r2=0.73, p<0.01), suggesting that the POC isotopic signals from upper ocean have been recorded in the sediments, partly due to the rapid export of particles as evidenced by low residence times of the highly particle-reactive 234Th from the upper water column. It is suggested that there probably exists an upper ocean-benthic coupling of carbon dynamics, which likely assures the sedimentary δ13C record an indicator of paleo-CO2 in the western Arctic Ocean.
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影响因子：
3
作者：
M. Hofmann;D. Wolf-Gladrow;Taro Takahashi;Steward C Sutherland;K. Six;E. Maier‐Reimer
通讯作者：
M. Hofmann;D. Wolf-Gladrow;Taro Takahashi;Steward C Sutherland;K. Six;E. Maier‐Reimer
影响因子：
5.8
作者：
R. Larson
通讯作者：
R. Larson
影响因子：
--
作者：
K. Brown;F. McLaughlin;P. Tortell;D. Varela;M. Yamamoto‐Kawai;B. Hunt;R. Francois
通讯作者：
K. Brown;F. McLaughlin;P. Tortell;D. Varela;M. Yamamoto‐Kawai;B. Hunt;R. Francois
DOI：
10.1016/j.dsr2.2005.10.012
发表时间：
2005-12
影响因子：
3
作者：
C. Ashjian;S. Gallager;S. Plourde
通讯作者：
C. Ashjian;S. Gallager;S. Plourde
影响因子：
5.3
作者：
CHEN, JH;EDWARDS, RL;WASSERBURG, GJ
通讯作者：
WASSERBURG, GJ