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基于奇异谱分析的深圳近海净初级生产力时间序列研究
张彦南, 王久娟, 段广拓, 陈劲松, 易琳
深圳先进技术研究院
摘要:
NPP长时间序列分析可获取NPP多年变化趋势、季节变化等动态信息,对海洋环境的监测与预报具有重要意义。本文以2003-2013年月际尺度净初级生产力卫星遥感产品为数据源,通过奇异谱分析提取标准化净初级生产力时间序列的长期趋势和周期震荡特征。研究表明,(1)浮标监测数据的叶绿素a浓度、海表温度与MODIS的叶绿素a浓度、海表温度产品变化趋势基本一致,则NPP时间序列产品可用于分析深圳近岸海域净初级生产力的变化趋势。(2)空间分布上,深圳西部海域的NPP和叶绿素a浓度远高于大鹏湾和大亚湾,大鹏湾和大亚湾的NPP和叶绿素a浓度均值及变化趋势非常接近。三个海区NPP、叶绿素a浓度、海表温度和光合有效辐射在季风转换期变化剧烈。(3)长期趋势上,深圳西部海域呈现2年周期波动趋势,在均值附近以年为周期上下波动。大鹏湾和大亚湾2003-2006年NPP低于平均水平,2008年后NPP开始以年为周期在平均值上下波动,2012年后NPP整体与均值持平。(4)周期特征上,深圳西部海域、大鹏湾和大亚湾的NPP呈“W”或“M”型周年变化,存在夏季主高峰(6-7月)和冬季次高峰(12-1月)。
关键词:  海洋净初级生产力  奇异谱分析  时间序列  深圳近海
DOI:10.11759/hykx20170926002
分类号:P76
基金项目:深圳市未来产业专项资金资助项目(JSGG20150512145714247) ;深圳市知识创新计划资助项目(JCYJ20150831194835299)
Study on Time Series of Net Primary Productivity in Shenzhen Coastal Waters Based on Singular Spectrum Analysis
Zhang Yannan, Wang Jiujuan, Duan Guangtuo, Chen Jingsong, Yi Lin
Shenzhen Institutes of Advanced Technology
Abstract:
Taking the monthly satellite remote sensing standard products of net primary productivity as data source, the study extracted the long-term trend and periodicity by means of Auto SSA. We found that the chlorophyll a concentration and sea surface temperature of buoy data were consistent with that of the MODIS images, and the time series images of the MODIS net primary production could be used for the analysis of the net primary production in Shenzhen coastal waters. Spatially the NPP and chlorophyll a concentration were much higher than that in Dapeng Bay and Daya Bay, and the mean value and the variation trend of the NPP and chlorophyll a concentration were closer between Dapeng Bay and Daya Bay. The marine parameters of the three sea areas fiercely changed in monsoon transition. In the long-term trend, it presented two-year periodic fluctuation around the mean value in Shenzhen west sea area. Meanwhile, the NPP was lower than the mean value from 2003 to 2006 in Dapeng Bay and Daya Bay. And the NPP fluctuated by one-year period around the mean value after 2008 and almost equaled to the mean value after 2012. In the aspect of the periodic characteristic, a double-periodic oscillation with a summer peak in June and July and a winter second peak in December and January was identified in Shenzhen west sea area , Dapeng Bay and Daya Bay.
Key words:  net primary productivity  singular spectrum analysis  time series  Shenzhen coastal waters
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