PAR:一个数值模糊的光学量（英文）"/> PAR是水环境研究中经常使用的一个光学量.水体的漫衰减系数与波长紧密相关,随着水体深度的不断增加,PAR频谱收缩到具有更小衰减系数的波长处,对上层水体或者混合均匀的水体而言,此时的KPAR与水深关系极为密切.为了更为准确的描述PAR剖面,获取更可靠的光学衰减参数,强调了KPAR数值的模糊性,倡导正确表达KPAR的垂直变化.;In studies of aquatic environments, an optical property, KPAR, which represents the diffuse attenuation coefficient of Photosynthetic Available Radiation (PAR), is used frequently. Because water's diffuse attenuation coefficient is highly spectral dependent and PAR is spectrally narrowing to wavelengths with less attenuation coefficients with increasing depth, this KPAR is significantly depth dependent in the upper water column even for well-mixed waters. In this article, with an aim for more reliable attenuation products and more accurate description of PAR profiles, the ambiguity associated with KPAR is highlighted, and the proper representation of the vertical variation of KPAR is advocated."/> PAR:一个数值模糊的光学量（英文）"/>
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引用本文:李忠平.KPAR:一个数值模糊的光学量（英文）.湖泊科学,2009,21(2):159-164. DOI:10.18307/2009.0202
Zhongping Lee.KPAR: An optical property associated with ambiguous values. J. Lake Sci.2009,21(2):159-164. DOI:10.18307/2009.0202
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KPAR:一个数值模糊的光学量（英文）
李忠平
密西西比州立大学北部海湾研究所, MS 39529, USA
摘要:
光合有效辐射(PAR)的漫衰减系数KPAR是水环境研究中经常使用的一个光学量.水体的漫衰减系数与波长紧密相关,随着水体深度的不断增加,PAR频谱收缩到具有更小衰减系数的波长处,对上层水体或者混合均匀的水体而言,此时的KPAR与水深关系极为密切.为了更为准确的描述PAR剖面,获取更可靠的光学衰减参数,强调了KPAR数值的模糊性,倡导正确表达KPAR的垂直变化.
关键词:  光合有效辐射  漫衰减系数  水色遥感
DOI：10.18307/2009.0202
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KPAR: An optical property associated with ambiguous values
Zhongping Lee
Northern Gulf Institute, Mississippi State University, Stennis Space Center, MS 39529
Abstract:
In studies of aquatic environments, an optical property, KPAR, which represents the diffuse attenuation coefficient of Photosynthetic Available Radiation (PAR), is used frequently. Because water's diffuse attenuation coefficient is highly spectral dependent and PAR is spectrally narrowing to wavelengths with less attenuation coefficients with increasing depth, this KPAR is significantly depth dependent in the upper water column even for well-mixed waters. In this article, with an aim for more reliable attenuation products and more accurate description of PAR profiles, the ambiguity associated with KPAR is highlighted, and the proper representation of the vertical variation of KPAR is advocated.
Key words:  PAR  KPAR  ocean color remote sensing
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