长江中下游4个湖泊非色素颗粒物吸收系数光谱模型  

Spectral Absorption Models of Tripton in Four Lakes in the Middle and Lower Reaches of the Yangtze River

作　　者：时志强[1] 张运林[1] 殷燕[1,2] 刘笑菡[1,2] 

机构地区：[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,江苏南京210008 [2]中国科学院研究生院,北京100049

出　　处：《环境科学研究》2012年第7期757-763,共7页Research of Environmental Sciences

基　　金：中国科学院知识创新工程项目(KZCX2-YW-QN312);国家自然科学基金项目(40971252);国家水体污染控制与治理科技重大专项(2012ZX07101-010)

摘　　要：利用指数模型和幂函数模型对2007年和2010年长江中下游4个湖泊58个样本ad(λ)(非色素颗粒物吸收系数)光谱进行拟合,以R2(决定系数)、RE(相对误差)和RMSE(均方根误差)等统计参数判定模型效果.指数模型和幂函数模型R2平均值、RE、RMSE分别为0.998、7.01%、0.015 m-1和0.994、15.90%、0.027 m-1.统计检验显示,指数模型的R2显著大于幂函数模型(ANOVA,P<0.001),而RE和RMSE则显著小于幂函数模型(ANOVA,P<0.001).指数模型能更准确地拟合ad(λ),得到的Sd(光谱斜率)平均值为(12.21±1.08)μm-1,400～700 nm波段内变异系数为8.85%,空间上4个湖泊之间变化不是很明显,仅傀儡湖的Sd略低于其他3个湖泊.ad(λ)与ρ(ISM)(无机悬浮颗粒物浓度)呈极显著正相关,通过ρ(ISM)可以得到长江中下游典型浅水湖泊ad(λ)光谱模型.The spectral absorptions of non-pigment particulate matter in Lake Kuileihu, Lake Donghu, Lake Liangzi and Lake Honghu were measured on 58 samples collected from September-October 2007 and October 2010. The goal was to develop exponential and power models which included the parameters of spectral slope （Sd ）, inorganic suspended matter and wavelengths describing the spectral absorption of non-pigment particulate matter. The determination coefficient （R2 ）, relative error （RE） and root mean square error （RMSE） were used to assess the performance of the models. The average R2 value of the exponential model was 0. 998, which was higher than that of the power model （0. 994） （ANOVA, P 〈 0. 001 ）. However, RE and RMSE for the exponential model （7.01% and 0. 015 m ^-1 , respectively） were lower than those for the power model （ 15.90% and 0. 027 m^-1 , respectively） （ ANOVA, P 〈 0. 001 ）. These results indicated that the exponential model was better than the power model. The mean Sd value of non-pigment particulate matter from the exponential model was （ 12. 21 ± 1.08）μm ^-1 , with a coefficient of variation of 8.85% for the range of 400-700 nm. The Sd in Lake Kuileihu was slightly higher than those of the other three lakes, but without a significant difference. This suggests that a mean value could be used to model non-pigment particulate matter spectral absorption in the four lakes. Significant linear correlations were found between non-pigment particulate matter absorption coefficient and inorganic suspended matter. The results indicate the potential to develop regional models to predict the absorption spectra using inorganic suspended matter concentration.

关 键 词：无机悬浮颗粒物 吸收系数 光谱斜率 长江中下游 

分 类 号：P341[天文地球—水文科学]