(Table 1) Characteristics of marine snow and ice samples at Barrow, Alaska ...

• Main Authors: Beine, Harry J, Anastasio, Cort, Domine, Florent, Douglas, Thomas A, Barret, Manuel, France, James, King, Martin, Hall, Sam, Ullmann, Kirk
• Format: Dataset
• Language: English
• Published: PANGAEA 2012
• Subjects: Sample type; Sample amount; Hydrogen peroxide, water; Hydrogen peroxide, standard deviation; Chloride; Chloride, standard deviation; Bromide; Bromide, standard deviation; Nitrate; Nitrate, standard deviation; Nitrite; Comment; Nitrite, standard deviation; Sulfate; Sulfate, standard deviation; Absorption coefficient, 220-600 nm; Absorption coefficient, standard deviation; Absorption coefficient, 300-450 nm; Carbon, organic, dissolved; Snow/ice sample; International Polar Year 2007-2008 IPY; Barrow; Beaufort Sea; International Polar Year; IPY; Sea ice; Alaska
• Online Access: https://dx.doi.org/10.1594/pangaea.807375; https://doi.pangaea.de/10.1594/PANGAEA.807375

We measured light absorption in 42 marine snow, sea ice, seawater, brine, and frost flower samples collected during the OASIS field campaign between February 27 and April 15, 2009. Samples represented multiple sites between landfast ice and open pack ice in coastal areas approximately 5 km west of Barrow, Alaska. The chromophores that are most commonly measured in snow, H2O2, NO3-, and NO2-, on average account for less than 1% of sunlight absorption in our samples. Instead, light absorption is dominated by unidentified "residual" species, likely organic compounds. Light absorption coefficients for the frost flowers on first-year sea ice are, on average, 40 times larger than values for terrestrial snow samples at Barrow, suggesting very large rates of photochemical reactions in frost flowers. For our marine samples the calculated rates of sunlight absorption and OH production from known chromophores are (0.1-1.4) x 10**14 (photons/cm**3/s) and (5-70) x 10**-12 (mol/L/s), respectively. Our residual spectra are ... : Nitrite comments: (d) This value was not measured, but was considered to be equal to the average Barrow terrestrial surface snow value during our campaign (Beine et al., 2011, doi:10.1029/2011JD016181). (e) This value was not measured, but was considered to be 1% of the nitrate value, as was typical for surface seawater in the Beaufort Sea (Simpson et al., 2007, doi:10.5194/acp-7-4375-2007). (f) This value was not measured, but was estimated by applying the average NO2- / NO3- ratio from our other marine samples (0.036; rel. std. deviation 82%, N = 14). Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 ...