春季东海营养盐跨陆架输运通量的初步估算

利用2011年5月的调查资料,分析了春季东海营养盐分布特征。受长江冲淡水影响,表层长江口附近营养盐浓度较高; 外海受黑潮表层水的影响营养盐浓度较低。计算并分析了跨200 m等深线的营养盐输运通量,结果表明黑潮在台湾东北部和九州岛西南部入侵陆架并将营养盐输运到陆架上,中段(26°N~29°N)则是营养盐向外输运。春季黑潮跨过200 m等深线向东海陆架的体积输运净通量为0.44 Sv,DIN、PO₄-P、SiO₃-Si通量分别为8.93 kmol/s、0.46 kmol/s、8.22 kmol/s。春季通过台湾海峡的营养盐DIN、PO₄-P、SiO₃-Si通量分别为6.65 kmol/s、0.41 kmol/s、6.52 kmol/s。表明春季台湾暖流对东海陆架海域营养盐的贡献与黑潮的贡献相当。

Preliminary estimates of cross shelf transport flux of nutrients in the East China Sea in spring

Concentrations of nutrient in the East China Sea were determined in spring, 2011.Concentrations of nutrients displayed obviously variability in the Yangtze River estuary, with higher levels in the shallow coastal waters influenced by Yangtze River diluted water.The main factor affecting the distribution of nutrients in the open sea was the Kuroshio.The flux of nutrients across the 200m isobath were calculated and studied.The results indicated that there were two areas where positive onshore flux was concentrated.One was northeast of Taiwan where the Kuroshio bumps against the shelf break and induces a large onshore flux of volume and nutrients.The other was located southwest of Kyushu where the Kuroshio veers toward Tokara Strait.Along the shelf break between them, the Kuroshio onshore flux of volume and nutrients was generally negative, indicating an offshore transport of water and nutrients.The Kuroshio onshore flux in spring was 0.44 Sv for volume, 8.93 kmol/s for DIN, 0.46 kmol/s for DIP, and 8.22 kmol/s for silicate.The Taiwan Warm Current onshore flux in spring was 2.40 Sv for volume, 6.65 kmol/s for DIN, 0.41 kmol/s for DIP, and 6.52 kmol/s for silicate.The values of the nutrient flux were on the same order as The Kuroshio.