ITP 1 was deployed as part of an Ice-Based Observatory cluster with IMB 07949 in 2005. To find a suitable floe for deploying the cluster, a helicopter reconnaissance was undertaken in the afternoon of August 14. One old floe was landed on and drilled with a 2” hand auger; however, the thickness was greater than 5 m, so was too thick. The second floe that was surveyed was relatively small (only about 100 m in length), ridged all around, and had sufficient level area between several large melt ponds. When drilled, it measured 4.6 m in thickness with 55 cm of freeboard so was suitable. The GPS position was obtained and the site was marked with several trash bags filled with snow so that it could be relocated.
By the next morning, the ship was positioned in the lead next to the selected ice floe, where a lone seal was spotted swimming. Between 10:00 and 11:30 MDT (16:00-17:30 UTC), all of the personnel and gear are conveyed to the ice floe in 3 flights and 4 sling loads. While drilling the 10” diameter hole for the ITP we are pleased to find that the ice is much harder than the rotten ice ITP 2 was deployed on last year. The deployment proceeds smoothly and the ITP is completely deployed only 1.5 hours after everything arrived on the ice.
Meanwhile, the helicopter required repairs, so after the IMB installation was finished, all of the deployment gear had to be hauled to an adjacent ice floe and loaded onto the small boat for transportation back to the ship. All operations were complete and everyone was back onboard by 22:30 UTC.
More information and photos on the deployment operation are also available here and at: http://www.whoi.edu/beaufortgyre/dispatch2005/dispatch15.html.