OIB completed the high priority North Beaufort Loop mission. This flight was designed to sample sea ice in the western Arctic Basin along north-south gradients in the Beaufort Sea, and to improve gaps in previous coverage primarily in the northeastern Beaufort. We overflew three mooring sites of the Beaufort Gyre Exploration Project equipped with upward-looking sonar, known as GAM-1, BGOS-B and BGOS-C. Parts of the eastern and western legs were flown along ICESat-2 ground tracks. In addition to Level-1 Requirements SI1 and SI2 this mission addresses sea ice level projected requirement SIP2d by extending sea ice baseline observations to the southern Chukchi Sea north of the Bering Strait. The mission was modified to overfly a buoy cluster at the request of Melinda Webster and Ignatius Rigor. The line was also modified to underfly a Sentinel-3A track at the request of Larry Connor. OIB entered the Sentinel-3A data line 7 minutes before the satellite passed over at 22:26:57Z.
 
Weather was good for most of the mission but began to deteriorate around the last half of the Sentinel-3A line. We lowered the flight altitude to get under the clouds which enabled good data to continue to be collected throughout the line. All instruments performed well during the flight making for an overall excellent day.
 

 
Data Volumes
 
ATM T6: 108 Gb
ATM T7: 122 Gb
CAMBOT: 77 Gb
FLIR: 11 Gb
KT19: 10 Mb
DMS: 81.9 Gb
 
Snow radar: 1.07 Tb
MCoRDS: No data collected
Accumulation radar: No data collected
 
Data on: 1803
Data off: 2313