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There has been a long history of interest on how (if) the absorption coefficient of “pure” fresh water (    a    fwλ    ) and “pure” seawater (    a    swλ    ) changes with temperature (  T  ), yet the impact of   T   reported in the literature differs significantly in the blue domain. Unlike the previous studies based on laboratory measurements, we took an approach based on ~18 years (2002–2020) of MODIS ocean color and temperature measurements in the oligotrophic oceans, along with field measured chlorophyll concentration and phytoplankton absorption coefficient, to examine the relationship between   T   and the total absorption coefficient (  a    λ    ) at 412 and 443 nm. We found that the values of   a    412and   a    443in the summer are nearly flat (slightly decreasing) for the observed   T   range of ~19–27 °C. Since there are no detectable changes of chlorophyll during this period, the results suggest that   T   has a negligible impact ona    sw412anda    sw443in this   T   range. As a complement, the impact of salinity ona    fwλwas also evaluated using three independent determinations ofa    swλanda    fwλ    , where good agreements were found from these observations.

Impact of Temperature on Absorption Coefficient of Pure Seawater in the Blue Wavelengths Inferred from Satellite and In Situ Measurements