摘要
在假定水体表面为镜面、水体中无内光源、无非弹性散射的前提下,通过Kirk的辐射传输理论,研究了太湖水体中不同的太阳高度角对真光层深度变化的影响.结果表明,散射系数与吸收系数的比(b/a)值的大小是决定太阳高度角对真光层深度影响的关键因子,b/a≥15时,太阳高度角对真光层深度的影响较小,基本可以忽略.针对秋季太湖区域而言,在较短波段(400~540nm)b/a的值在整个湖区均较小,此时要考虑太阳高度角对真光层深度的影响;在较长波段(540~700nm),b/a的值在整个湖区均较大,可以不考虑太阳高度角对真光层深度的影响.
In the context of Kirk's radiative transfer theory under the assumption that a mirror surface water column has no internal light source and elastic scattering,an investigation was conducted on the effect of the solar altitude angles on the depth of euphotic layer in Taihu Lake.Evidences showed that the ratio of scattering to absorption coefficients(b/a) was the key factor to determine the extent of the above effect,which would be smaller and even be neglected if the ratio(b/a) reached to 15 or larger.As for the autumn season,due to the fact that the ratio(b/a) was relatively smaller(larger) in the entire lake,the solar altitude angle effect should be taken into account(ignored) in the short-wave(long-wave) band of 400~540nm(540~700nm).
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2011年第10期1690-1696,共7页
China Environmental Science
基金
国家自然科学基金资助项目(41071070
40701168)
国家科技重大专项(2009ZX07101-013)
关键词
真光层深度
太阳高度角
太湖水体
euphotic depth
solar altitude angles
water body of Lake Taihu