THIS PROJECT IS TO PROVIDE GROUND VALIDATION FOR NASA SATELLITE REMOTE SENSING OF AEROSOLS OVER SNOW-COVERED TERRAIN. SPECIFICALLY WE WILL MAKE A SERIES OF SNOW DEPTH DENSITY AND GRAIN SIZE MEASUREMENTS IN THE BARROW ENVIRONMENTAL OBSERVATORY (BEO) EAST OF UTQIAGVIK ALASKA. THESE WILL BE MADE DURING FIELD OPERATIONS BETWEEN MID-APRIL AND MID-JUNE 2019. THE MEASUREMENTS WILL BE MADE ON A SCHEDULE DETERMINED BY THE RATE OF SNOW MELT WITH MORE FREQUENT (EVERY 2ND OR 3RD DAY) SUITES OF MEASUREMENTS DURING PERIODS OF RAPID MELT. THE MEASUREMENTS WILL INCLUDE BUT NOT BE LIMITED TO A) COLLECTION OF SNOW DEPTH AND STRATIGRAPHY IN A PIT AT THE MEASUREMENT SITE B) SURFACE ALBEDO USING AN ASD DEVICE OR EQUIVALENT C) OPTICAL GRAIN SIZE MEASUREMENTS USING A REFLECTANCE INSTRUMENT CALLED AN ICECUBE THAT WILL BE PROVIDED BY NASA AND D) COLLECTION OF NEAR-SURFACE SNOW SAMPLES WHICH WILL BE ALLOWED TO MELT THEN FILTERED IN AN APPROPRIATE WAY TO PRODUCE FILTERS THAT CAN BE ANALYZED FOR DUST BLACK CARBON AND OTHER PARTICULATES. WE (THE GEOPHYSICAL INSTITUTE/UAF) WILL PRODUCE AND HAND OVER THE FILTERS BUT THE ACTUAL FILTER ANALYSIS WILL BE DONE BY NASA. WE WILL PROVIDE NASA WITH COPIES OF FIELD NOTES EXCEL FILES CONTAINING MEASUREMENTS OF GRAIN SIZE (ICECUBE) AND ALBEDO (ASD) AND WILL SUMMARIZE THE FIELD CAMPAIGN IN A REPORT.