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Preliminary study on particulate organic carbon export fluxes in the Bering Sea

【标题】Preliminary study on particulate organic carbon export fluxes in the Bering Sea

【Title】Preliminary study on particulate organic carbon export fluxes in the Bering Sea

【作者】 曾志; 何建华; 尹明端; 陈立奇; 曾实; 马豪

【Author】 Zeng Zhi ; He Jianhua ; Yin Mingduan ; Chen Liqi ; Zeng Shi ; Ma Hao

【期刊】极地研究

【Journal】

【期刊年份】2009

【卷】20

【期】1

【关键词】 234 Th /238U disequilibria; euphotic zone; particulate organic carbon; Bering Sea

【Keywords】 234 Th /238U disequilibria; euphotic zone; particulate organic carbon; Bering Sea

【摘要】During the Second Chinese National Arctic Expedition (CHINARE) from July to September 2003, depth profiles of dissolved and particulate 234 Th in upperwater columns were collected at two stations of BR03 and BR24 in the Bering Sea. 234 Th was sampled by using a traditional Fe(OH) 3 co-precipitation technique, which is a reliable approach to 234 Th measurement. We observed 234 Th excess at station BR03 below the euphotic zone, which was possibly due to the intensive remineralization of particulatematter. Particulate organic carbon ( POC ) export fluxes were estmiated from a one-dmiensional irreversible steady state model of 234 Th fluxes together with measurements o f the POC/ 234 Th ratio on the suspended particles. The POC export fluxes from the euphotic zone were 11. 66 and 11. 69 mmol C m -2 d -1 at BR03 and BR24 stations, respectively. The ratios of POC fluxes to prmiary production at the two stations were about 0. 5 and 0. 59, respectively, probably due to the presence of large phytoplankton ( in particular diatoms) .

【Abstract】During the Second Chinese National Arctic Expedition (CHINARE) from July to September 2003, depth profiles of dissolved and particulate 234 Th in upperwater columns were collected at two stations of BR03 and BR24 in the Bering Sea. 234 Th was sampled by using a traditional Fe(OH) 3 co-precipitation technique, which is a reliable approach to 234 Th measurement. We observed 234 Th excess at station BR03 below the euphotic zone, which was possibly due to the intensive remineralization of particulatematter. Particulate organic carbon ( POC ) export fluxes were estmiated from a one-dmiensional irreversible steady state model of 234 Th fluxes together with measurements o f the POC/ 234 Th ratio on the suspended particles. The POC export fluxes from the euphotic zone were 11. 66 and 11. 69 mmol C m -2 d -1 at BR03 and BR24 stations, respectively. The ratios of POC fluxes to prmiary production at the two stations were about 0. 5 and 0. 59, respectively, probably due to the presence of large phytoplankton ( in particular diatoms) .

【基金/项目】 白令海与西北冰洋碳通量及其对北极快速变化的响应 ; 南极中山站大气铅污染的同位素示踪研究 ; 南大洋碳循环监测技术及应用研究

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