Abstract

We compared the mean normalized water-leaving radiances (${[\overline{L_W}(\lambda )]}_N$) of two in-water optical profilers, a compact optical profiling system (C-OPS) and a HyperPro II Optical Profiler (HP2), with modeled ${[\overline{L_W}(\lambda )]}_N$ at five stations in Monterey Bay, California. Although C-OPS and HP2 ${[\overline{L_W}(\lambda )]}_N$s were mostly within one standard deviation, C-OPS and modeled ${[\overline{L_W}(\lambda )]}_N$ showed the lowest absolute percent differences ($\le 25\%$ for most wavelengths) at four of the stations. We attribute this to C-OPS’s high vertical resolution ($\sim 1\mathrm{cm}$), which is important for detecting changes in optical layers and for measuring the upper 0–0.5 m of the water column. HP2’s low vertical resolution ($\sim 50\mathrm{cm}$), low signal-to-noise ratio, and inability to measure the upper 0–0.5 m are problematic in Monterey Bay. Although a significant component of the ${[\overline{L_W}(\lambda )]}_N$ differences between C-OPS and HP2 likely stems from fluctuating water mass’s inherent optical properties, the 25% error in ${[L_W(\lambda )]}_N$s processed from HP2 casts, compared to $<1\%$ for C-OPS, is also important.

© 2019 Optical Society of America

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