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引用本文:石亮亮,毛志华,刘明亮,张艺蔚.暴雨事件对千岛湖CDOM及颗粒物吸收光谱特征的影响.湖泊科学,2018,30(2):358-374. DOI:10.18307/2018.0208
SHI Liangliang,MAO Zhihua,LIU Mingliang,ZHANG Yiwei.Effects of rainstorm on the spectral absorption properties of chromophoric dissolved organic matter and particles in Lake Qiandao. J. Lake Sci.2018,30(2):358-374. DOI:10.18307/2018.0208
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暴雨事件对千岛湖CDOM及颗粒物吸收光谱特征的影响
石亮亮1,2, 毛志华2, 刘明亮3, 张艺蔚4
1.浙江大学海洋学院, 杭州 316021;2.国家海洋局第二海洋研究所卫星海洋环境动力学国家重点实验室, 杭州 310012;3.杭州市环境保护科学研究院, 杭州 310014;4.中国科学院上海技术物理研究所, 上海 200083
摘要:
为了研究暴雨事件对千岛湖有色可溶性有机物(CDOM)和颗粒物吸收光谱的影响,利用2016年暴雨前(3月1-6日)和暴雨后(4月6-11日)采集的水样,对暴雨前、后千岛湖水体CDOM、浮游藻类和非藻类颗粒物的吸收光谱特征进行分析,探讨暴雨事件对其造成的影响.结果表明:千岛湖作为典型的深水型内陆湖泊,其CDOM、浮游藻类颗粒物和非藻类颗粒物的吸收强度较太湖等浅水型湖泊弱.暴雨前,CDOM光谱吸收系数aCDOMλ)值在0~0.6 m-1范围内变化,其光谱拟合系数SCDOM的均值为0.0158±0.00145 nm-1.暴雨前浮游藻类光谱吸收在总颗粒物中占主导,aphλ)在0~0.35 m-1范围内变化,非藻类颗粒物光谱吸收系数aNAPλ)在0~0.15 m-1范围内变化,其光谱拟合系数SNAP均值为5.62±0.57 μm-1;暴雨后CDOM光谱吸收系数aCDOMλ)值在0~1.6 m-1范围内变化,其光谱拟合系数SCDOM的均值为0.0157±0.00101 nm-1.暴雨后浮游藻类光谱吸收系数aphλ)在0~2.5 m-1范围内变化,非藻类颗粒物光谱吸收在部分区域已占据主导地位,aNAPλ)在0~0.8 m-1范围内变化,其光谱拟合系数SNAP均值为5.72±0.68 μm-1.由CDOM吸收特征值相对分子质量M值得出,暴雨前、后千岛湖不同区域CDOM组成都以富里酸为主,且暴雨前M值分布较均匀,暴雨后M值呈现从新安江向缓冲区、东南区递增的趋势,这说明西北区随暴雨输入的腐殖酸增加了CDOM的相对分子质量.暴雨对SNAP值影响较大的区域为西北区、西南区、东北区,对西南区影响最小.本研究为使用光学手段深入探讨暴雨事件对千岛湖水环境的影响提供重要依据.
关键词:  千岛湖  暴雨事件  有色可溶性有机物  浮游藻类颗粒物  非藻类颗粒物  吸收光谱
DOI:10.18307/2018.0208
分类号:
基金项目:国家自然科学基金项目(4120617)、国家重大科技专项(41-Y20A31-9003-15/17)和海洋公益科学技术研究基金项目(2010050030)联合资助.
Effects of rainstorm on the spectral absorption properties of chromophoric dissolved organic matter and particles in Lake Qiandao
SHI Liangliang1,2, MAO Zhihua2, LIU Mingliang3, ZHANG Yiwei4
1.Ocean College, Zhejiang University, Hangzhou 316021, P. R. China;2.State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, P. R. China;3.Hangzhou Institute of Environment Science, Hangzhou 310014, P. R. China;4.Shanghai Institute of Technical Physics of the Chinese Academy of Sciences, Shanghai 200083, P. R. China
Abstract:
To study the influence of heavy rainfall on absorption characteristics of chromophoric dissolved organic matter (CDOM) and particles in Lake Qiandao, the samples were collected on March 1-6, 2016 (before the rainstorm) and April 6-11, 2016 (after the rainstorm). The spectral absorption of CDOM, phytoplankton and non-algal particles (NAP) in the lake were analyzed and the influence of rainstorm was discussed. The results showed that Lake Qiandao, as a typical deep inland lake, its spectral absorption coefficients of CDOM, phytoplankton and NAP is small, compared with shallow lakes like Lake Taihu. The CDOM spectral absorption coefficients varied in the range of 0-0.6 m-1, the mean value of the spectral fitting coefficient of CDOM(SCDOM) was 0.0158±0.00145 nm-1 before the rainstorm. The spectral absorption of phytoplankton before the rainstorm dominated the absorption of total particles, varied in the range of 0-0.35 m-1. The spectral absorption coefficients of NAP varied in the range of 0-0.15 m-1, and the mean value of spectral fitting coefficient of NAP(SNAP) was 5.62±0.57 μm-1 before the rainstorm; The CDOM spectral absorption coefficients varied in the range of 0-1.6 m-1 SCDOM was 0.0157±0.00101 nm-1 after the rainstorm. The spectral absorption of phytoplankton varied in the range of 0-2.5 m-1. NAP absorption dominated the absorption of particles in some regions after the rainstorm, aNAP(λ)varied in the range of 0-0.8 m-1 and SNAP was 5.72±0.68 μm-1. The M value showed that CDOM composition of the different regions of the lake is mainly fulvic acid both before and after the rainstorm, the spatial distribution of M value is relative even before the rainstorm. However, the M value showed an increasing trend from the Xin'anjiang to the buffer area and southeastern area after the rainstorm, which indicates that humic acids increased the relative molecular mass of CDOM in the northwestern area. Rainstorm had the greatest impact on the northwestern, southwestern and northeastern areas regarding the value of SNAP, with the smallest impact on the southwestern area. This study provides an important basis for the use of optical means to further explore the impact of heavy rainfall on aquatic environment of Lake Qiandao.
Key words:  Lake Qiandao  rainstorm  chromophoric dissolved organic matter  phytoplankton  non-algal particles  absorption spectra
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