Time-series sediment trap record of alkenones from the western Sea of Okhotsk
Time-series sediment trap record of alkenones from the western Sea of Okhotsk
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DOI：
10.1016/j.marchem.2006.12.002
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发表时间：
2007-03
期刊：
影响因子：
3
通讯作者：
O. Seki;T. Nakatsuka;K. Kawamura;S. Saitoh;M. Wakatsuchi
中科院分区：
文献类型：
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作者：
O. Seki;T. Nakatsuka;K. Kawamura;S. Saitoh;M. Wakatsuchi
对1998年8月至2000年6月在库页岛西部鄂霍次克海季节性海冰区两个深度采集的时间序列沉积物捕集器样品中的C37-C39烯酮进行了测量，以研究该地区的烯烃生产和水柱过程。可测量的烯烃出口通量在-lt；0.1到5.8gμg/m2/天之间，清楚地表明烯酮的生产仅限于秋季。1998年，烯烃的最大出口通量出现在9月份，当时地表水柱层结良好，表层混合层营养物质含量低。在第二年，最大的通量出现在10月份。与卫星海洋表面温度的比较表明，1998年8月估算的海洋表面温度比卫星海温低∼10℃，表明这一时期在表层到次表层温跃层中产生了烯酮。圈闭下部的烯烃年平均通量低于上部圈闭，表明水体中烯烃的降解速度较快，但UK37值变化不大。这项研究表明，库页岛近海表层沉积物中保存的UK37‘值反映的是近地表水温的季节信号，而不是年平均地表温度。
C37–C39alkenones were measured in time-series sediment trap samples collected from August 1998 to June 2000 at two depths in the seasonal sea ice region of the western Sea of Okhotsk, off Sakhalin, in order to investigate alkenone production and water-column processes in the region. Measurable export fluxes of alkenones are ranged from <0.1 to 5.8 μg/m2/day and clearly showed that the alkenone production was restricted to autumn. In 1998, maximum export flux of alkenones occurred in September when surface water column was well stratified with low nutrients in the surface mixing layer. In the next year, the maximum flux is observed in October. Comparison between alkenone temperature and satellite based sea surface temperature (SST) shows that the estimated alkenone temperatures in August 1998 were found to be ∼10 °C lower than the temporal satellite SST, suggesting that alkenones are produced in surface to subsurface thermocline layers during the period. Annual mean flux of alkenones is lower in the lower traps than that of the upper traps, suggesting rapid degradation of alkenones in water column, but the UK37′ value is not significantly altered. This study indicates that UK37′ values preserved in the surface sediments off Sakhalin reflect the seasonal temperature signal of near surface water, rather than annual mean surface temperature.