Data file containing optical characterization of colored dissolved organic matter (CDOM). Data include CDOM absorption coefficients, water column light attenuation coefficients, specific UV light absorbance (SUVA254), spectral slope ratio, and fluorescence index from waters near Toolik Lake on the North Slope of Alaska. A synthesis of the data presented here is published in Cory et al. 2013, PNAS 110:3429-3434, and in Cory et al. 2014, Science 345:925-928.
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The detailed protocol for absorbance and fluorescence analysis of DOM is found at http://www-personal.umich.edu/~gwk (click on the protocol link at the bottom of the page), or at the NSF Arctic LTER website under the Landscape Interactions mainpage at http://ecosystems.mbl.edu/ARC/landwater/landwaterdefault.html.
Attenuation coefficients were measured using a compact optical profiling system for UV light in natural waters (UV C-OPS; Biospherical Instruments Inc., San Diego, CA; Cory et al. 2013, 2014). The C-OPS measured downwelling cosine-corrected irradiance at 305, 313, 320, 340, 380, and 395 nm. Attenuation coefficients (Kd,λ) were calculated from the downwelling irradiance (Eλ) as a function of depth (z) at each waveband:
December 2014 - Created this file, version .01