Colored dissolved organic matter absorption (aCDOM) and spectal slopes (S) in the surface water of the Mackenzie Delta Region during 4 expeditions from spring to fall in 2019 ...

• Main Authors: Matsuoka, Atsushi, Juhls, Bennet, Bécu, Guislain, Oziel, Laurent, Leymarie, Edouard, Lizotte, Martine, Ferland, Joannie, Béguin, Marine, Laberge-Carignan, Audrey, Guilmette, Caroline, Maury, Juliette, Hilborn, Andrea, Tisserand, Lucas, Devred, Emmanuel, Doxaran, David, Bossé-Demers, Thomas, Babin, Marcel
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: biogeochemistry; Biooptics; Coastal waters; hydrographic data; Mackenzie; Event label; Cruise/expedition; LATITUDE; LONGITUDE; DATE/TIME; Station label; DEPTH, water; Absorption coefficient, colored dissolved organic matter at 254 nm; Absorption coefficient, colored dissolved organic matter at 350 nm; Absorption coefficient, colored dissolved organic matter at 375 nm; Absorption coefficient, colored dissolved organic matter at 443 nm; Spectral slope of colored dissolved organic matter absorption, 350-500 nm; Multiple investigations; UltraPath, World Precision Instruments, Inc.; NUNATARYUK, Permafrost thaw and the changing Arctic coast, science for socioeconomic adaptation NUNATARYUK; Arctic; Mackenzie Delta; permafrost
• Online Access: https://dx.doi.org/10.1594/pangaea.937580; https://doi.pangaea.de/10.1594/PANGAEA.937580

Measurement of CDOM absorption was conducted from a water sample within 12 hours of collection using an UltraPath liquid waveguide system (World Precision Instruments, Inc.) over the wavelengths ranging from 200 to 722 nm (see also Matsuoka et al. (2012; doi:10.5194/bg-9-925-2012) for details). To minimize temperature effects, both the sample and the reference water were kept at 4 °C for at least 30 minutes prior to analysis. We followed the International Ocean Colour Coordinating Group (IOCCG) Ocean Optics and Biogeochemistry CDOM protocols (Mannino et al., 2019 (see further details)) with a few modifications: 1) reference water with salinity ±2 relative to the sample was prepared on site a few hours before sample analysis to minimize the effect of difference in refractive index between sample and reference; 2) aCDOM(λ) was measured in flow mode, meaning, a measurement was made while water was running using a peristaltic pump (Lefering et al., 2017; doi:10.1364/AO.56.006357). While the use of a long optical ... : Empty cells = NA ...