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export.of particulate organic carbon estimated from ^(234)Th-^(238)U disequilibria and its temporal variation in the South China Sea

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Chinese Science Bulletin 2001年第20期46卷 1722-1726页

作者： CAI Pinghe, HUANG Yipu, CHEN Min, LIU Guangshan & QIU YushengDepartment of Oceanography, Xiamen University, Xiamen 361005, China Department of Oceanography Xiamen University Xiamen China

Activities of 234Th and nutrient concentrations in the upper 500 m water column were measured at a time-series station in the South China Sea over a time span of 12.3 d. Results showed a reduction of dissolved 234Th and an overall increase of particulate 234Th during the period. Meanwhile, activities of total 234Th kept fairly constant, implying rapid transformation of 234Th between the dissolved and particulate forms. Vertical profiles of total 234Th showed evident deficit of 234Th relative to 238U in the upper 500 m water column. Using an irreversible steady-state model of thorium scavenging, export.fluxes of particulateorganic carbon (POC) corresponding to time points T1 and T2 were estimated to be 46.5 and 13.1 mmolC .m-2. d-1. It was demonstrated that the estimation of POC export.was greatly dependent on the POC/234Thp ratios and the bias caused by the different models of 234Th scavenging, however, was considered to be of minor importance.

关键词： South China Sea 234Th-238U disequilibria POC export.

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Dipole anomaly in the Arctic atmosphere and winter Arctic sea ice motion

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Science China Earth Sciences 2005年第9期48卷 1529-1536页

作者： WU Bingyi1, ZHANG Renhe1 & WANG Jia2 1. Chinese Academy of Meteorological Sciences, Beijing 100081, China 2. International Arctic Research Center, University of Alaska Fairbanks, AK 99775, USA Chinese Academy of Meteorological Sciences Beijing China International Arctic Research Center University of Alaska Fairbanks USA

This paper investigates a previously-ignored atmospheric circulation anomaly-di- pole structure anomaly in the arctic atmosphere, and its relationship with the winter sea ice mo- tion, based on analyses of the International Arctic Buoy Programme Data (1979―1998) and datasets from the National Center for Environmental Prediction (NCEP) and the National Center for Atmospheric Research (NCAR) for the period of 1960―2002. The dipole structure anomaly is the second-leading mode of EOF of monthly mean SLP north of 70°N during the winter season (Oct.―Mar.), which accounts for 13% of the variance. One of its two anomaly centers is over the Canadian Archipelago; the other is situated over northern Eurasia and the Siberian marginal seas. Due to the dipole structure anomaly’s strong meridionality, it becomes an important mechanism to drive both anomalous sea ice export.out of the Arctic Basin and cold air outbreaks into the Barents Sea, the Nordic Seas and northern Europe.

关键词： dipole anomaly, winter season, Arctic, sea ice motion, sea ice export.

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