Photochemistry data set for NSF Photochemistry project on the North Slope of Alaska.


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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Published on EDI/LTER Data Portal


Kling, G., Cory, R. 2014. Photochemistry data set for NSF Photochemistry project on the North Slope of Alaska. Environmental Data Initiative.

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Tuesday, June 15, 2010 to Wednesday, August 21, 2013

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The detailed protocol for absorbance and fluorescence analysis of DOM is found at (click on the protocol link at the bottom of the page), or at the NSF Arctic LTER website under the Landscape Interactions mainpage at

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:

Version Changes: 

December 2014 - Created this file, version .01

Sites sampled.

Full Metadata and data files (either comma delimited (csv) or Excel) - Environmental Data Initiative repository.

Use of the data requires acceptance of the data use policy --> Arctic LTER Data Use Policy