HOT 293: Chief Scientist Report Chief Scientist: Dan Sadler R/V Ka'Imikai-O-Kanaloa May 22-26, 2017

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HOT 293: Chief Scientist Report Chief Scientist: Dan Sadler R/V Ka'Imikai-O-Kanaloa May 22-26, 2017 Cruise ID: KOK17-10 Departed: May 22, 2017 at 0750 (HST) Returned: May 26, 2017 at 0943 (HST) Vessel: R/V Ka'Imikai-O-Kanaloa Master of the Vessel: Mike Hoshlyk OTG Marine Technicians: Sonia Brugger and Rob Palomares 1. SCIENTIFIC OBJECTIVES The objective of the cruise was to maintain a collection of hydrographic and biogeochemical data at the Hawaii Ocean Time-series (HOT) stations. Four stations were to be occupied during the cruise, in the following order: 1) Station 1, referred to as Station Kahe, is located at 21 20.6'N, 158 16.4'W and was to be occupied on May 22nd for about 3 hours. 2) Station 2, referred to as Station ALOHA, is defined as a circle with a 6 nautical mile radius centered at 22 45'N, 158 W. This is the main HOT station and was to be occupied May 23 rd, 24 th, and 25 th. 3) Station 50, the site of WHOTS-13 Mooring (anchor position 22 47.24' N, 157 54.45' W) was to be occupied on May 25 th for about one hour. 4) Deep Trap Deployment Site (22 51'N, 157 54 W) was to be occupied for approximately 3 hours on May 25 th. Upon arrival to Station Kahe a 350 lb. weight-test cast to 500 m, one CTD cast to 1000 m, and a Hyperpro cast were to be conducted on the afternoon of May 22 nd. The single CTD cast was to be conducted to collect continuous profiles of various physical and chemical parameters. Water samples were to be collected at discrete depths for biogeochemical measurements. After these operations were satisfactorily completed, the ship was to proceed to Station ALOHA. Upon arrival to Station ALOHA, the sediment trap array was to be deployed and remain in the water for about 56 hours followed by a CTD cast to 1000 m cast to collect water for the Primary Productivity array. This was to be followed by the deployment of the free-drifting Primary Productivity array to incubate in situ for 12 hours. A full-depth (~4740 m) CTD cast was to be conducted after the deployment of the Primary Productivity array, and followed by 1000 m CTD casts at strict 3 hour intervals for at least 36 hours for continuous and discrete data collection, ending with another full-depth CTD cast at 2300 on May 24 th. There were issues with rosette bottle 13 closing on casts S2C2, S2C3 and S2C12. Post cruise salt analysis indicate mistrips on these casts. The pylon latch was replaced after S2C12 and no further problems were encountered. The free-drifting gas array was to be deployed for 24 hours for incubation experiments on May 24 th. An Automated Trace Element (ATE) sampler was to be deployed to a depth of 10 m on May 24th. A plankton net was to be towed three times between 1000-1400, and three times between 2200-0200 for 30 minute intervals on May 23 rd and 24 th at Station ALOHA. The Hyperpro was to be deployed for a half-hour period near ~1400 on May 22 nd, 23 rd, and 24 th.

An optics package including a SeaBird Seacat with temperature, conductivity, fluorometer and pressure sensors, and a LISST particle size and distribution analyzer was to be used to profile the upper 200 m at Station ALOHA in the early morning on May 25 th. After the optics package and 36 hour burst period of CTD work at Station ALOHA was accomplished, the ship was to transit to recover the floating Net Trap array, Gas array, and the Sediment Trap array on the morning of May 25 th. After recovering the arrays, the ship was to transit to Station 50 to conduct a one-hour 200 m CTD yo-yo cast. Once operations at Station 50 were complete, the ship was to proceed to the Deep Trap Deployment site to deploy the deep moored sediment traps After the deep trap deployment was complete, the ship was to transit back to Pier 35. The following instruments were to collect data throughout the cruise: shipboard ADCP, thermosalinograph, the underway fluorometer, and the ship's anemometers. 2. SCIENCE PERSONNEL Participant Title Affiliation Citizenship Dan Sadler Research Associate UH USA Brenner Wai Research Associate UH USA Karin Björkman Research Specialist UH Sweden Blake Watkins Marine Engineer UH USA Tara Clemente Research Associate UH USA Morgan Linney Graduate Student UH USA Eric Shimabukuro Research Associate UH USA Andrew King Research Associate UH USA Svetlana Naratov Graduate Student UH USA Kellen Rosburg Research Associate UH USA Jefrey Snyder Marine Technician UH USA Sonia Brugger Marine Technician OTG USA Rob Palomares Marine Technician OTG USA Kyle Aukai Student UH USA Antonio Miranda Student UH USA Casey Ching Graduate Student UH USA 3. GENERAL SUMMARY Operations during the cruise were conducted as planned with slight delays on the last day picking up the floating arrays. The gas array recovery was delayed when it got caught in the rudder post and time was spent looking for the missing sediment trap gear. As the floating arrays had drifted over 30 miles from the WHOTS site, the extended transit time required shortening the WHOTS cast to 3 cycles to insure enough time for the deep trap deployment. The cruise departed Pier 35 at 0750, a slight delay as we waited for a volunteer to show up. They were not able to attend so the cruise proceeded without them. Operations at Station Kahe were completed successfully. The transit to Station ALOHA was slowed due to wind and seas. Arrival was later than scheduled (0145 on May 23 rd ). Upon arrival at Station ALOHA the sediment traps were deployed 2 nm south of station center. They drifted westward during the cruise. One 1000 m cast to collect water for the Primary Productivity array was

completed and the PP array was deployed. The ship moved to station center where the deep cast was conducted successfully and the 36-hour CTD period began on schedule. One 1000 m CTD cast was completed at Station Kahe, two near bottom CTD casts and thirteen 1000 m CTD casts were conducted at Station ALOHA. One 200 m yo-yo CTD cast was completed near the WHOTS mooring (Station 50) with three cycles completed. The Primary Production array was successfully deployed and recovered on May 23 rd. The Gas Array was successfully deployed and recovered, though the upper floats and line caught on the rudder post during recovery resulting in a 2 hour delay while it was all sorted out. The Sediment Trap array was lost along with the SeapHOx. We were able to track and recover the communications buoy which had been detached from the rest of the array. Six net tows for the core HOT zooplankton collection were completed successfully; three during the day, and three during the night. Three Hyperpro casts (three cycles each) were successfully conducted two times around the scheduled 1330-1430 time slot on May 22 nd,23 rd, and 24 th. The ATE successfully collected a sample on May 24 th. The optical package (Sea Bird Seacat/ Fluorometer /LISST), was deployed once in the early morning on May 25 th. Two of the 200m yoyo cast were completed. A third yoyo was aborted due to concern over grinding noises emanating from the capstan. The ADCP, underway fluorometer, thermosalinograph and the ship s meteorological suite ran without interruption during the cruise. Winds during the cruise were mostly from the E and NE with speeds of 18-25 kts. The seas were 6-8 ft with a westerly current. We arrived at Pier 35 for off-loading on May 26th, at 0943 (HST). The following operations were cancelled or delayed due problems with equipment: 1. A third Optics cast yoyo was cancelled due to noise in the capstan. The following operations were cancelled or delayed due problems with ship and/or maneuvering: 1. Recovery of the floating gas array was slowed due to entanglement with the ships rudder post. The following were problems experienced with ships equipment: 1. None 4. R/V Ka Imikai-O-Kanaloa OFFICERS AND CREW, TECHNICAL SUPPORT

The R/V Ka Imikai-O-Kanaloa continues to provide good ship support for our work. Captain Mike Hoshlyk and the entire ship s crew showed enthusiasm, concern, and dedication to our scientific mission. The ship maintained appropriate wire angles during CTD and back deck operations. Technical support during this cruise was very good. The OTG personnel were available at any time to assist in our work during the cruise. They were especially helpful in communicating wire angle during back deck operations. 5. DAILY REPORT OF ACTIVITIES (HST) May 22, 2016 0750 Depart Pier 35 0815 Safety/OTG/Science Meeting 0840 Fire Drill 1100 Weight Cast to 500 m 1145 Hyperpro cast at 21 20.61 N 158 16.42 W 1235 S1C1 ctd cast to 1000 m 1405 Transit to ALOHA May 23, 2015 0145 Arrive ALOHA, Begin Sediment Trap Deployment 0231 Sediment Traps released at 22 45.34 N, 158 02.67 W 0250 S2C1 ctd cast to 1000 m 0510 Primary Production Array deployed at 22 45.41 N, 158 01.89 W 0600 S2C2 ctd cast to near bottom 1130 S2C3 ctd cast to 1000 m 1300 Net tow 1340 Hyperpro cast at 22 45.22 N, 157 59.73 W 1430 S2C4 ctd cast to 1000 m 1600 Transit to PP cast recovery site 1657 S2C5 ctd cast to 1000 m 1924 Recover PP array @ 22 42.693 N, 158 8.849 W 2034 S2C6 ctd cast to 1000 m 2207 Net Tow 2241 Net Tow 2312 S2C7 ctd cast to 1000 m MaY 24, 2017 0030 Transit to pump tanks 0155 S2C8 ctd cast to 1000 m 0430 Deploy Gas Array @ 22 45.05 N, 158 01.10 W 0525 S2C9 ctd cast to 1000 m 0635 OTG reported T-Sal stopped logging. They are troubleshooting 0750 T-Sal logging. 0800 S2C10 ctd cast to 1000 m 1020 ATE cast @ 22 45.20 N, 157 58.57 W. 1100 S2C11 ctd cast to 1000 m

1215 Net Tow 1245 Net Tow 1330 Hyperpro cast 1410 S2C12 ctd cast to 1000 m 1658 S2C13 ctd cast to 1000 m 1950 S2C14 ctd cast to 1000 m 2159 Net tow 1059 S2C15 ctd cast to near bottom May 25, 2015 0310 Optics cast at 22 45.37 N, 157 59.35 W. Completed 2 yoyo cycles. Cancelled 3rd due to capstan grinding noise. 0425 Transit to Gas Array 0645 Recover Gas Array at 22 41.31 N, 158 12.20 W. Array caught on rudder during approach. Assessed with GoPro camera and were able to recover. 0800 Transit to sediment traps 1100 Arrive at sediment traps. 22 39.33 N, 158 39.41 W. Sediment trap buoy recovered but no gear was attached. The 2 shackles attaching the bridle to the buoy had been removed. Both shackles had been moused with seizing wire so only explanation was they were purposefully removed. Lost sediment trap line, weight, 1 PIT cross, 12 traps and SeapHOx. Suspect a fishing boat encountered the gear and removed the buoy. L. Fujieki and S. Poulos provided iridium positions for the entire deployment. Kellen and Andrew analyzed the data and provided a probable location for the incident. The ship followed a line along the expected drift track but did not find anything 1110 Transit to WHOTS 1420 Arrive WHOTS 1624 S50C1 yoyo ctd cast to 300 m, 3 cycles 1722 Transit to deep moored sediment trap deployment site. Began trap deployment 1957 Deep trap anchor deployed at 22 51.971 N, 157 53.167 W 2000 Transit to Pier 35 May 26, 2017 0901 Arrive Pier 35 1000 Post Cruise Meeting held in Marine Center conference room

HOT program sub-components: Investigator Project Institution Dave Karl Core Biogeochemistry UH John Dore Biogeochemistry QA/QC MSU Roger Lukas Hydrography UH Mike Landry Zooplankton dynamics SIO Ricardo Letelier Optical measurements OSU Ancillary programs: Andrew Dickson CO 2 dynamics and intercalibration SIO Paul Quay DI 13 C UW Matt Church Diversity and activities of nitrogen-fixing UM/FLBS microorganisms Sam Wilson Reduced gases in the upper ocean: The cycling of UH methane, sulfide and nitrous oxide. Dave Caron SCOPE: DNA collection USC Ed DeLong SCOPE: DNA and Viral DNA collection UH Dan Repeta SCOPE: DOM collection WHOI Angelique White SCOPE: Diazotroph Microscopy, Underway C-STAR OSU