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Time-series observation of dissolved inorganic carbon and nutrients in the northwestern North Pacific

机译：北太平洋西北部溶解性无机碳和养分的时间序列观测

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Time-series measurements of dissolved inorganic carbon (DIC) and nutrient concentrations were conducted in the northwestern North Pacific from October 2002 to August 2004. Assuming that data obtained in different years represented time-series seasonal data for a single year, vertical distributions of DIC and nutrients showed large seasonal variabilities in the surface layer (～100 m). Seasonal variabilities in normalized DIC (nDIC) and nitrate concentrations at the sea surface were estimated to be 81–113 μmol kg?1 and 12.7–15.7 μmol kg?1, respectively, in the Western Subarctic Gyre. The variability in nutrients between May and July was generally at least double that in other seasons. In the Western Subarctic Gyre, estimations based on statistical analyses revealed that seasonal new production was 39–61 gC m?2 and tended to be higher in the southwestern regions or coastal regions. The seasonal new productions in the northwestern North Pacific were two or more times higher than in the North Pacific subtropical gyre and the northeastern North Pacific. It is likely that this difference is due to spatial variations in the concentrations of trace metals and the species of phytoplankton present. In addition, from estimations of surface pCO2 it was verified that the Western Subarctic Gyre is a source of atmospheric CO2 between February and May and a sink for CO2 between July and October.
机译：2002年10月至2004年8月，在西北太平洋西北部进行了溶解无机碳（DIC）和养分浓度的时间序列测量。假设不同年份获得的数据代表一年的时间序列季节性数据，则DIC的垂直分布养分表层（〜100 m）的季节变化较大。在西北极圈内，海面归一化DIC（nDIC）和硝酸盐浓度的季节性变化估计分别为81–113μmolkg？1和12.7-15.7μmolkg？1。五月至七月之间的养分变化通常至少是其他季节的两倍。在西北极圈，基于统计分析的估计表明，季节性新产量为39-61 gC m？2，在西南地区或沿海地区往往更高。北太平洋西北部的季节性新产量比北太平洋副热带高压环流和东北北太平洋高出两倍或两倍以上。这种差异很可能是由于痕量金属的浓度和浮游植物种类的空间差异所致。此外，从对地表pCO2的估计中可以证实，西亚北极涡流是2月至5月期间大气CO2的来源，而7月至10月之间是大气CO2的汇源。

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