Electromagnetic-laser - 1.7, 5.0, 11.7 and 35.1 kHz - Footprint 30-35m - Δt= 10Hz Δx= 3-4m 200km data sets per flight Ice thickness Surface roughness Bulk.

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Electromagnetic-laser - 1.7, 5.0, 11.7 and 35.1 kHz - Footprint 30-35m - Δt= 10Hz Δx= 3-4m 200km data sets per flight Ice thickness Surface roughness Bulk ice conductivity Ocean Surface conductivity Ice thickness profiles B1-S1 NRC line #3 North to South Aug. 16 afternoon 100m ship Marked Sled-NRC line

~15km line section floe North of B1-S1 and ship ship

B1-S1 marked sled- NRC line parallel to ship 190m long 4 lines flying N-S over marked line And one (bottom) Line soft-landing on first 10 markers

B1-S2 3 of 15 lines ~1500m each

B1-S2 marked sled-NRC line Three lines flown N-S in the fog on Aug 18 afternoon And bottom line soft-landing at 10 markers

GPR Sunday Aug 14 north floe GPR probably is penetrating through while surface low saline ice found above freeboard GPR and laser distance Helicopter is a moving reference frame

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