CAJ | 학술논문

在不考虑叶绿素荧光效应的前提下,基于水体光学活性因子藻类叶绿素、有色可溶性有机物及非藻类颗粒物的吸收和后向散射系数,根据前向辐射传输模型模拟水面以上遥感反射率,分析了藻类叶绿素红光峰强度和波长位置随浓度的变化规律.结果发现:叶绿素浓度为1～50 μg·L~(-1)时,红光峰强度和叶绿素浓度呈较好的线性关系,随叶绿素浓度的增加,线性关系越来越不明显.当叶绿素浓度为1～1 000 μg·L~(-1)时,则呈现较好的对数关系;随叶绿素浓度的增加,红波段反射峰波长位置按对数规律逐渐向长波方向移动,不同水色组分的水体,其叶绿素在红波段的光谱反射特性随浓度的变化规律是一致的;此外,对比研究显示红波段反射峰特征不同于荧光光谱.
재불고필협록소형광효응적전제하,기우수체광학활성인자조류협록소、유색가용성유궤물급비조류과립물적흡수화후향산사계수,근거전향복사전수모형모의수면이상요감반사솔,분석료조류협록소홍광봉강도화파장위치수농도적변화규률.결과발현:협록소농도위1～50 μg·L~(-1)시,홍광봉강도화협록소농도정교호적선성관계,수협록소농도적증가,선성관계월래월불명현.당협록소농도위1～1 000 μg·L~(-1)시,칙정현교호적대수관계;수협록소농도적증가,홍파단반사봉파장위치안대수규률축점향장파방향이동,불동수색조분적수체,기협록소재홍파단적광보반사특성수농도적변화규률시일치적;차외,대비연구현시홍파단반사봉특정불동우형광광보.
The chlorophyll-a concentration in waters is one of the main parameters of water color remote sensing in caseⅡwaters.There is a reflectance peak in red band region because of inherent optical properties.Based on the coefficients of absorption and hackscattering of waters,colored dissolved organic matter(CDOM),tripton and chlorophyll-a,the reflectance of remote sensing was simulated according to the forward radiation transfer model without the consideration of fluorescence peak.The reflectance peak intensity and reflectance peak position at different wavelengths in red band region were analyzed with different chlorophyll-a concentration.There is a good linear relationship between the red reflectance peak intensity and chlorophyll-a concentration when the chlorophyll-a concentration is 1-50 μg·L~(-1).But the linear relationship between the reflectance peak intensity and chlorophyll-a concentration will decrease with the increasing ehlorophyll-a concentration.When chlorophyll-a concentration is up to 1 000 μg·L~(-1),the logarithm relationship between the reflectance peak intensity and chlorophyll-a concentration is better than linear relationship.The wavelength position of reflectance peak in red band region will shift towards larger wavelength at logarithmic growth rate with increasing chlorophyll-a concentration,and the logarithm relationship will be more apparent with the inoreasing chlorophyll-a concentration.The same trend happens to the reflectance peak intensity and the wavelength position of peak in red region with different in-water constituents,such as CDOM,tripton and so on.Furthermore,according to the comparison with fluorescence peak,the authors also found that the reflectance peak intensity and the wavelength position of peak in red region are different from those of the fluorescence peak.