An experimental test of the impact of temperature on pure water absorption coefficient in the NIR domain
Liangfeng Chen,1 Zhongping Lee, 2, * Gong Lin,1 and Yongchao Wang 1
1. State Key Lab of Marine Environmental Science, Xiamen University, Xiamen 361005, China
2. School for the Environment, University of Massachusetts Boston, Boston, MA 02125, USA
There are many reports on the impact of temperature on the absorption coefficient of “pure” water (aw, m-1), where the conclusions are not consistent. In this study, we adopted a method based on remote-sensing reflectance (Rrs, sr-1) of highly turbidity water, where the spectral shape of Rrs in the NIR domain is driven by aw. We obtained Rrs spectra of various turbidity with the temperature in a range of ~7-52 ℃. By analyzing the spectral shape of Rrs in the NIR domain, we found that with increasing temperature, the slope of the Rrs spectrum becomes smaller from 770 nm to 820 nm and becomes larger from 820 nm to 900 nm. This result is in good agreement with the result obtained by using aw under different temperature and presents an independent approach to successfully validate measurements from laboratory settings.
Keywords：Absorption coefficient, pure water, temperature, remote-sensing reflectance
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