| 摘要: |
| 基于美国国家海洋大气管理局(NOAA) 2007年发布的全球海域营养盐数据库资料和美国国家地球物理数据中心(NGDC) 2006年发布的全球地貌数据库资料，在MATLAB计算机平台上，利用研发的数值分析与成图技术，对东海北部海域营养盐分布的季节变化特征进行分析。结果表明：(1) 东海北部海域NO-3-N、PO3-4-P分布总特征为由沿岸向离岸递减，由表层向底层递增；西北高，东南低，呈扇形向东南扩展；SiO-3-Si有两个浓度高值区，一个为研究区域的西北角，另一个在东北角；(2) 在0～50 m的表层营养盐平均浓度均是冬季最高；50～200 m的中层NO-3-N、SiO-3-Si夏季最高；200 m以下的底层四季变化微弱，其中400～500 m层PO3-4-P、SiO-3-Si浓度值秋季最高。NO-3-N变异系数表层最大，PO3--P中层最大、SiO-3-Si底层最大，其中NO-3-N相应各层变异系数大于PO3-4-P、SiO-3-Si；(3) 研究区域四季均存在高营养盐水团。高PO3-4-P、SiO-3-Si水团中心分别位于125.5°E、30.5°N和 128.5°E、30.5°N；高NO-3-N水团中心，随冬-春-夏-秋、从南往东北再向西、最后向东南，在125°～128°E、29°～31°N范围内移动。 |
| 关键词: 东海北部 硝酸盐(NO-3-N) 磷酸盐(PO3-4-P) 硅酸盐(SiO-3-Si) 高营养盐水团 |
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| 基金项目:上海市科学技术委员会攻关项目(062412049);上海市教育委员会重点项目(082269)；上海市教委重点学科建设项目（J50402） |
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| Seasonal variation and causative analysis of nutrients distribution in the northern of the East China Sea |
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ZHANG Jian-ping,KANG Jian-cheng,REN Hui-ru,LI Wei-jiang,XIE Xiao-jin
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| Abstract: |
| Based on two databases, the first one is global sea Nutrients which was released by the United States National Oceanic and Atmospheric Administration in 2007, which was named World Ocean Atlas 2005(WOA05). The other one is global topography which was issued by the United States National Geophysical Data Center in 2006. This paper used MATLAB computer program plot and numerical analysis techniques to analyze the seasonal variation characteristics of nutrients distribution in the northern of the East China Sea. The results are as follows: Firstly, the general characters of Nitrate and Phosphate distributions in the northern East China Sea are similar. Their concentrations in the northwest of the study area are higher than that in the southeast, decrease from the near shore to offshore, increase from the surface to the bottom. The maximum of Silicate also is in the Northwest of the area, but there is a sub-maximum concentration in the Northeast. Secondly, the nutrients concentration increased with depth in all seasons. There is not any nutrient cline. The average concentrations of nutrients in the surface are the highest in winter. Nitrate in the 50～150 meters layer and Silicate in the 50～200 meters layer are the highest in summer. There are weak changes in the bottom during four seasons, and in 400～500 m layer Phosphate and Silicate concentrations are largest in autumn. Finally there are high nutrient closed contours in four seasons, which is high-nutrient water mass. The high-Nitrate nutrition water masse's center moves from the south to the north-east, then the west, and finally to the southeast. This center moves within 125～128°E, 29～31°N in four seasons. There is also a cycle of change in intensity, the strongest is in winter, the weakest is in summer. High-Phosphate nutrient center locates on 125.5°E, 30.5°N, and Silicate locates on 128.5°E, 30.5°N. |
| Key words: the northern of East China Sea nitrate phosphate silicate high-nutrient water mass |
