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首页> 外文期刊>Marine Chemistry >Export fluxes of particulate organic carbon in the Chukchi Sea: A comparative study using ~(234)Th/~(238)U disequilibria and drifting sediment traps
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Export fluxes of particulate organic carbon in the Chukchi Sea: A comparative study using ~(234)Th/~(238)U disequilibria and drifting sediment traps

机译：楚科奇海中颗粒有机碳的出口通量：利用〜（234）Th /〜（238）U不平衡和漂移沉积物陷阱的比较研究

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摘要

Large-volume sampling of ~(234)Th and drifting sediment trap deployments were conducted as part of the 2004 Western Arctic Shelf-Basin Interactions (SBI) Spring (May 15-June 23) and summer (July 17-August 26) process cruises in the Chukchi Sea. Measurements of ~(234)Th and particulate organic carbon (POC) export fluxes were obtained at five stations during the spring cruise and four stations during the summer cruise along Barrow Canyon (BC) and along a parallel shelf-to-basin transect from East Hanna Shoal (EHS) to the Canada Basin. ~(234)Th and POC fluxes obtained with in situ pumps and drifting sediment traps agreed to within a factor of 2 for 70% of the measurements. POC export fluxes measured with in situ pumps at 50 m along BC were similar in spring and summer (average= 14.0 ± 8.0 mmol C m~(-2) day~(-1) and 16.5±6.5 mmol C m~(-2) day~(-1), respectively), but increased from spring to summer at the EHS transect (average=1.9±1.1 mmol C m~(-2) day~(-1) and 19.5 ± 3.3 mmol C m~(-2) day~(-1), respectively). POC fluxes measured with sediment traps at 50 m along BC were also similar in both seasons (31.3±9.3 mmol C m~(-2) day~(-1) and 29.1 ±14.2 mmol C m~(-2) day~(-1), respectively), but were approximately twice as high as POC fluxes measured with in situ pumps. Sediment trap POC fluxes measured along the EHS transect also increased from spring to summer (3.0 ± 1.9 mmol C m~(-2) day~(-1) and 13.0±6.4 mmol C m~(-2) day~(-1), respectively), and these fluxes were similar to the POC fluxes obtained with in situ pumps. Discrepancies in POC export fluxes measured using in situ pumps and sediment traps may be reasonably explained by differences in the estimated POC/~(234)Th ratios that arise from differences between the techniques, such as time-scale of measurement and size and composition of the collected particles. Despite this variability, in situ pump and sediment trap-derived POC fluxes were only significantly different at a highly productive station in BC during the spring.
机译：〜（234）Th的大体积采样和漂移性泥沙捕集器部署是在2004年西部北极陆架-盆盆相互作用（SBI）春季（5月15日至6月23日）和夏季（7月17日至8月26日）过程中进行的在楚科奇海。沿巴罗峡谷（BC）和沿东向平行的陆架与盆地横断面，在春季航行期间的五个站点和夏季航行期间的四个站点获得了〜（234）Th和颗粒有机碳（POC）出口通量的测量值。汉娜·肖尔（EHS）来到加拿大盆地。在70％的测量中，用原位泵和漂移的泥沙收集器获得的〜（234）Th和POC通量在2的系数内一致。在春季和夏季，用泵在BC沿现场测量的POC出口通量相似（平均= 14.0±8.0 mmol C m〜（-2）天〜（-1）和16.5±6.5 mmol C m〜（-2天〜（-1）分别），但从EHS断面的春季到夏季有所增加（平均= 1.9±1.1 mmol C m〜（-2）天〜（-1）和19.5±3.3 mmol C m〜（ -2）天〜（-1）。在两个季节，用沉积物捕集器在BC处测量的POC通量在两个季节也相似（31.3±9.3 mmol C m〜（-2）天〜（-1）和29.1±14.2 mmol C m〜（-2）天〜（ -1），但大约是现场泵测得的POC通量的两倍。从春季到夏季，沿EHS断面测量的沉积物捕集POC通量也有所增加（3.0±1.9 mmol C m〜（-2）天〜（-1）和13.0±6.4 mmol C m〜（-2）天〜（-1 ）），这些通量与现场泵获得的POC通量相似。使用现场泵和沉积物捕集阱测量的POC出口通量的差异可以通过估算POC /〜（234）Th比率的差异来合理地解释，POC /〜（234）Th比率是由于技术之间的差异而产生的，例如测量的时标，尺寸和组成收集的颗粒。尽管存在这种可变性，但在春季，在卑诗省一个高产站，原位泵和沉积物诱集的POC通量仅显着不同。

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