Subsurface primary production in the western subtropical North Pacific as evidence of large diapycnal diffusivity associated with the Subtropical Mode Water
Subsurface primary production in the western subtropical North Pacific as evidence of large diapycnal diffusivity associated with the Subtropical Mode Water
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DOI：
10.5194/osd-6-1717-2009
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发表时间：
2009-08
期刊：
影响因子：
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通讯作者：
C. Sukigara;T. Suga;T. Saino;K. Toyama;D. Yanagimoto;K. Hanawa;N. Shikama
中科院分区：
文献类型：
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作者：
C. Sukigara;T. Suga;T. Saino;K. Toyama;D. Yanagimoto;K. Hanawa;N. Shikama
抽象的。在亚热带模式水（STMW）形成区域部署了配备荧光计、溶解氧传感器以及温度和盐度传感器的剖面浮标。它获得了2006年3月至7月的准拉格朗日、5天间隔时间序列记录。叶绿素a的时间序列分布显示，整个初夏（5月至7月），叶绿素a在50-80 m处存在持续且相当大的深部叶绿素最大值，就在STMW上界上方。在此期间，垂直综合叶绿素值始终在 15–30 mg m−2 范围内，表明初级生产持续进行，并且养分的持续供应范围在 10–30 mgN m−2 day−1 范围内。时间序列数据显示没有明显的养分供应零星事件。相反，我们的结果支持最近测量的大垂直扩散率值（~5×10−4 m2 s
Abstract. A profiling float equipped with a fluorometer, a dissolved oxygen sensor, and temperature and salinity sensors was deployed in the Subtropical Mode Water (STMW) formation region. It acquired quasi-Lagrangian, 5-day-interval time-series records from March to July 2006. The time-series distribution of chlorophyll a showed a sustained and sizable deep chlorophyll maximum at 50–80 m, just above the upper boundary of the STMW, throughout early summer (May–July). Vertically integrated chlorophyll values during this period consistently ranged from 15–30 mg m−2, indicating sustained primary production and a continuous supply of nutrients ranging from 10–30 mgN m−2 day−1. The time-series data showed no appreciable sporadic events of nutrient supply. Instead, our results support the recently measured large vertical diffusivity values (~5×10−4 m2 s