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引用本文:李云亮,张运林,刘明亮.太湖真光层深度的计算及遥感反演.湖泊科学,2009,21(2):165-172. DOI:10.18307/2009.0203
LI Yunliang,ZHANG Yunlin,LIU Mingliang.Calculation and retrieval of euphotic depth of Lake Taihu by remote sensing. J. Lake Sci.2009,21(2):165-172. DOI:10.18307/2009.0203
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太湖真光层深度的计算及遥感反演
李云亮1,2, 张运林1, 刘明亮1
1.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 太湖湖泊生态系统研究站, 南京 210008;2.南京大学地理与海洋科学学院, 南京 210093
摘要:
真光层是浮游植物进行光合作用的水层,真光层反演有利于初级生产力的进一步估算.利用2007-01-07和2006-08-01两期陆地卫星TM数据与同步水质参数数据,建立太湖水体非色素颗粒物浓度和叶绿素a浓度的反演模型,反演出太湖冬、夏两季的非色素颗粒物、叶绿素a浓度.然后根据在太湖建立的真光层深度与非色素颗粒物、叶绿素a浓度之间的关系模型,计算得到太湖冬、夏两季真光层深度空间分布.结果表明,就整个湖区而言,冬季真光层深度变化范围为0.27-2.28m,均值为0.56±0.22m,夏季真光层深度变化范围为0.21-2.03m,均值为0.98±0.24m.从空间上看,冬季时真光层深度的变化规律为:南太湖<西部沿岸<湖心区<胥口湾<贡湖湾<梅梁湾<东太湖<竺山湾;夏季时的变化规律为:西部沿岸<梅梁湾<东太湖<湖心区<贡湖湾<竺山湾<南太湖<胥口湾.从季节上看,夏季真光层深度显著大于冬季,但不同湖区真光层深度季节变化也存在一定差异,其中梅梁湾、贡湖湾、西部沿岸、湖心区、胥口湾、南太湖夏季真光层深度大于冬季,而竺山湾和东太湖夏冬变化则不是很明显.
关键词:  太湖  真光层深度  非色素颗粒物  叶绿素a  反演
DOI:10.18307/2009.0203
分类号:
基金项目:中国科学院知识创新工程项目(KZCX1-YW-14-2,KZCX2-YW-419);国家自然科学基金重点项目(40730529)联合资助
Calculation and retrieval of euphotic depth of Lake Taihu by remote sensing
LI Yunliang1,2, ZHANG Yunlin1, LIU Mingliang1
1.Lake Taihu Laboratory Ecosystem Research Station, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.School of Geography and Ocean Sciences, Nanjing University, Nanjing 210093, P. R. China
Abstract:
The euphotic zone is defined as the layer where net phytoplankton production is positive. Therefore, determination of the euphotic depth is useful for estimating primary production. The TM data on 2007-01-07 and 2006-08-01, accompanied by real-time water quality parameters including concentrations of tripton and chlorophyll-a (Chl.a) in Lake Taihu, were used to develop quantitative retrieval models of tripton and Chl.a. Euphotic depth was calculated using the model developed in Lake Taihu based on the concentrations of tripton and Chl.a. The euphotic depth ranged from 0.27 to 2.28m (mean 0.56±0.22m) in winter depth from 0.21 to 2.03m (mean 0.98±0.24m) in the summer. In the winter, the euphotic depths showed spatial distributions which were ordered as: the south of Lake Taihu < the west coast of Lake Taihu < the lake center < Xukou Bay < Gonghu Bay < Meiliang Bay < East Lake Taihu < Zhushan Bay. In summer, the order changed as follows: the west coast of Lake Taihu
Key words:  Lake Taihu  euphotic depth  tripton  chlorophyll-a  retrieval
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