Mass concentrations of light-absorbing impurities in the surface snow at Sapporo, northern Japan

*1: We have been used NH4H2PO4 as a flocculants of the filtration from 2012-2013 season.*2: TC=EC+OC*3: A=1.45 times correction(EC), B=4.15 times correction(EC) and 1.17 times correction(OC).*4: We used melted sample stored in polypropylene bottle for measurement.*5: Fields without data should be left empty (and NOT filled with '-', 'n/a', 'NaN', -9999 or '*' etc).