doi: 10.25923/3rg3-d269 CRUISE SUMMARY R/V Atlantis / DSV Alvin Expedition AT-41 August 19 to September 2, 2018 for DEEP SEARCH DEEP Sea Exploration to Advance Research on Coral/Canyon/Cold seep Habitats Deepwater Atlantic Habitats II: Continued Atlantic Research and Exploration in Deepwater Ecosystems with Focus on Coral, Canyon and Seep Communities Contract - M17PC00009 Table of Contents Page 1 EXPEDITION BACKGROUND ................................................................................................................. 1 2 NOAA OER QUICK LOOK REPORT ....................................................................................................... 1 3 GENERAL DIVE PLANS .......................................................................................................................... 3 3.1 CANYONS ............................................................................................................................................................................... 3 3.2 CORALS ................................................................................................................................................................................. 3 3.3 SEEPS .................................................................................................................................................................................... 3 4 EXPEDITION ACTIVITIES-NARRATIVE ................................................................................................. 3 4.1 AUGUST 16-18: CRUISE MOBILIZATION .................................................................................................................................... 3 4.2 AUG 19: DEPARTURE .............................................................................................................................................................. 4 4.3 AUG 20 .................................................................................................................................................................................. 4 4.3.1 0200 Multibeam ................................................................................................................................................................. 4 4.3.2 0800 Alvin 4960 - Wilmington Canyon .............................................................................................................................. 4 4.3.3 1300 Alvin recovery ........................................................................................................................................................... 4 4.4 AUG 21 .................................................................................................................................................................................. 4 4.4.1 0400 Multibeam ................................................................................................................................................................. 4 4.4.2 0800 Alvin 4961 – Pea Island Seeps ................................................................................................................................ 4 4.4.3 1700 Alvin recovery ........................................................................................................................................................... 4 4.4.4 1800 CTD 01 and 02 ......................................................................................................................................................... 4 4.5 AUG 22 .................................................................................................................................................................................. 5 4.5.1 0200 Multibeam ................................................................................................................................................................. 5 4.6 AUG 23 .................................................................................................................................................................................. 5 4.6.1 0930 Alvin 4962 – Richardson Ridge ................................................................................................................................ 5 4.6.2 1700 Alvin recovery ........................................................................................................................................................... 5 4.6.3 1730 CTD 03 and 04 ......................................................................................................................................................... 5 4.6.4 1830 CTD 05 ..................................................................................................................................................................... 5 4.7 AUG 24 .................................................................................................................................................................................. 5 4.7.1 0800 Alvin 4963 – Richardson Ridge ................................................................................................................................ 5 4.7.2 1400 Alvin recovery ........................................................................................................................................................... 6 4.7.3 1600 CTD 06 and 07 ......................................................................................................................................................... 6 4.8 AUG 25 .................................................................................................................................................................................. 6 4.8.1 0800 Alvin A4964 – Blake Deep ....................................................................................................................................... 6 4.8.2 1700 Alvin recovery ........................................................................................................................................................... 6 4.8.3 1830 CTD 08 and 09 ......................................................................................................................................................... 6 4.9 AUG 26 .................................................................................................................................................................................. 6 4.9.1 0800 Alvin A4965 – Stetson Banks ................................................................................................................................... 6 4.9.2 1700 Alvin recovery ........................................................................................................................................................... 7 4.9.3 1830 CTD 10 ..................................................................................................................................................................... 7 4.10 AUG 27 .................................................................................................................................................................................. 7 4.10.1 0800 Alvin A4966 – Stetson Banks ............................................................................................................................... 7 4.10.2 1530 Alvin recovery ....................................................................................................................................................... 7 4.10.3 1630 CTD 11 and 12 ..................................................................................................................................................... 7 4.11 AUG 28 .................................................................................................................................................................................. 7 4.11.1 0830 Alvin 4967 – Blake Ridge ..................................................................................................................................... 7 4.11.2 1700 Alvin recovery ....................................................................................................................................................... 8 4.11.3 1800 CTD 13 ................................................................................................................................................................. 8 4.12 AUG 29 .................................................................................................................................................................................. 8 4.12.1 0800 Alvin 4968 – Cape Fear coral mound ................................................................................................................... 8 4.12.2 1530 Alvin recovery ....................................................................................................................................................... 8 4.12.3 1630 CTD 14 and 15 ..................................................................................................................................................... 8 4.13 AUG 30 .................................................................................................................................................................................. 8 4.13.1 Alvin 4969 – Pamlico Canyon ....................................................................................................................................... 8 4.13.2 1700 Alvin recovery ......................................................................................................................................................