CRUISE INSTRUCTIONS (Complete pdf)
Ship: R/V Ocean Starr
Cruise Number: 1207-OS
Cruise Dates: July 2 – August 31, 2012
Cruise Title: California Current Ecosystem (CCE) Survey.
Study Area: US/Mexican border to San Francisco, with variable transect lengths.
- Leg 1: 2 JUL San Diego 19 JUL – Arrive San Diego, CA 18 DAS
- Leg 2: 22 JUL San Diego 01 AUG - Arrive San Diego, CA 11 DAS
- Leg 3: 02 AUG San Diego 16 AUG – Arrive Port Hueneme, CA 15 DAS
- Leg 4: 17 AUG Port Hueneme 31 AUG – Arrive San Francisco, CA 16 DAS
Total 60 DAS
- NOAA/NMFS, Southwest Fisheries Science Center (SWFSC)
- Fisheries Resources Division (FRD)
|CalCOFI-CCE 1207 Legs 1 & 2||CCE Island Wake Survey Area Leg 2||CalCOFI-CCE 1207 Legs 3 & 4|
|Refer to the final Cruise Instruction pdf for details; click images for larger maps.|
- To conduct continuous underway sampling of surface waters. Temperature and salinity will be automatically logged by computer with the output from the GPS navigational unit.
- To contribute to ongoing assessment of pelagic fish stocks between San Diego and San Francisco, California.
- To collect information the size distribution and species composition of pelagic fish for acoustics ground truth information using trawling.
- To monitor environmental conditions within the CCE survey area.
- To record continuous acoustic targets obtained with a multi-frequency Simrad EK-60 scientific sounder.
- To service and move three moorings on CalCOFI line 90.
- To carry out an intensive field survey of island wakes around San Clemente and Catalina Islands, and south of San Nicolas Island, to detect hotspots of production supporting juvenile sardine and other juvenile fish.
PLAN OF OPERATIONS
The Ocean Starr will conduct operations from south to north along the west coast from San Diego to San Francisco, CA. The April CCE Survey was conducted as a two ship synoptic survey of the western US coast of North America. The current July survey extends the survey into the summer season, repeating most of the April transect lines of the April survey, south of San Francisco, applying the same methodologies, but incorporating time to (1) retrieve and service two oceanographic moorings, and (2) to carry out some intensive sampling of island wakes near the Catalina and San Clemente Islands, and to the south of San Nicolas Island.
- During leg 1, the Ocean Starr will conduct standard CalCOFI operations on the basic six line/75 station grid.
- During leg 2, operations will focus on collaborative mooring operations with Scripps Institution of Oceanography and intensive sampling around Catalina and San Clemente Islands, and to the south of San Nicolas Island, as mentioned above.
- During leg 3, plankton stations will be limited to night hours to permit continuous acoustic running during daylight. Plankton sampling of this area, south of Point Conception, will recently have been done by the preceding CalCOFI survey. Each night time plankton station on leg 1 will comprise CTD, pairovet, bongo and manta tows at the same location.
- During leg 4, north of Point Conception, full station work will be carried out in daylight and at night.
1.1.1 Standard CalCOFI station work will include the following:
126.96.36.199 CalBOBL (CalCOFI Bongo) - standard oblique plankton tow with 300 meters of wire out, depth permitting, using paired 505 µm mesh nets with 71 cm diameter openings. The technical requirements for this tow are: Descent wire rate of 50 meters per minute and an ascent wire rate of 20 meters per minute. All tows with ascending wire angles lower than 38° or higher than 51° in the final 100 meters of wire will be repeated. Additionally, a 45° wire angle should be closely maintained during the ascent and descent of the net frame. A self-contained LOPC (Laser Optical Particle Counter) will be mounted in the port side opening during each tow only during leg I (CalCOFI stations). The port side sample will be preserved in buffered ethanol at every station.
188.8.131.52 Weather observations.
184.108.40.206 PRPOOS (leg 1 only): (Planktonic Rate Processes in Oligotrophic Ocean Systems net) will be fished from 210 meters to the surface(depth permitting) using a 50 cm diameter 202 µm mesh net. The PRPOOS will be towed at all prescribed CalCOFI stations on lines 90.0 and 80.0 as well as stations out to and including station 70.0 on lines 86.7 and 83.3. These data will be used in analyses by the LTER (Long Term Ecological Research) project. Descent rate of 40 meters per minute, a terminal depth time of 20 seconds and an ascent rate of 50 meters per minute. All tows with wire angles exceeding 15° during the ascent will be repeated.
220.127.116.11 A light meter will be used to measure the light intensity in the euphotic zone once a day with the primary productivity cast and all daytime stations.
1.1.3 Acoustics – Calibration of the Simrad EK-60 echosounder will be performed at the beginning of the cruise (requiring 6-12 hours). The EK-60 echosounder will be operated at 38, 70, 120 and 200 kHz and interfaced to a data acquisition system to estimate small pelagic and krill biomass between 10 and a maximum of 750 m. The vessel's EQ-50, ES-60 or Skipper depth sounder may be used minimally at the discretion of the Commanding Officer, but will normally remain off while underway. The ship shall inform the Cruise Leader of any use of the vessel's sounders, as it interferes with the signals received on the scientific EK-60 that will be used continuously.
1.1.4 CUFES - The egg pump will be mounted inside the ship’s hull drawing water from a depth of three meters. During the grid occupation, the pump will run continuously between stations to sample any pelagic fish eggs. Approximately 640 liters/minute is sent through a concentrator which filters all material larger than 505µm. The sieved material is then collected and identified. All fish eggs are identified to lowest taxa, counted and entered into the data acquisition software. Each sample entry is coupled with sea surface temperature, geographical position, wind speed and direction, date and time, and surface salinity. Sampling intervals will vary in length, depending on the number of fish eggs seen, from five to 30 minutes.
1.1.6 IKMT net sampling for juvenile fishes – During leg 2, an Isaacs-Kidd Mid-water Trawl (IKMT) will be deployed between the hours of approximately 1800 and 0600 PST at locations around Catalina and San Clemente Islands, and to the south of San Nicolas Island in the Southern California Bight at positions determined by prevailing oceanographic conditions just prior to the cruise. These conditions will be assessed based on the most recent available 1-km remote sensing imagery and line 90 spray glider data just prior to the cruise. The positions may be changed at the discretion of the Chief Scientist or Cruise Leader
1.1.7 Bird Observations – During daylight hours on legs 1 & 4, a bird observer will be posted on the flying bridge to identify and count birds while the ship is underway during cruise transects.
1.1.8 Acoustic hydrophone – During transit between most daylight stations on leg I (CalCOFI), an acoustic hydrophone array will be towed from the stern at a distance of 300 meters with a deck loaded winch to record sounds from marine mammals. The winch is 440V 3-phase with a deck pattern of 4.5 by 4.5 feet. Upon approaching a station, a sonobuoy will be deployed one nautical mile prior to stopping for station work.
1.1.9 Mooring operations – During the last three days of leg 2, the ship will occupy two locations (indicated in leg 2 of appendix 2) to service pre-existing and deploy new mooring arrays.
1.1.10 Island wakes survey (leg 2) – The effects of (1) currents flowing over variable topography and (2) winds on the ocean in the lee of the hills on islands creates different kinds of eddies due to currents, and to stratification of the water column due to shelter from prevailing winds. Current wakes increase mixing and enhance production, while wind wakes produce patches of warmer water. Both increased production and warmer water may be favorable to the growth and survival of larval and juvenile fishes. The purpose of the high resolution island wakes survey is to test the hypothesis that both wind and current wakes provide hotspots for the survival of larval and juvenile fishes. We predict that (1) density of larval and juvenile fishes will be higher in the wakes, (2) the size distributions of larval and juvenile fishes will be relatively larger in the wakes, and (3) that the condition of juvenile fishes will be higher in the wakes. Over the period of one week we will conduct high resolution CTD, CUFES, multi-frequency acoustic, plankton (bongo, pairovet, manta) and IKMT sampling on either side of, and within, current and wind wakes off Catalina and San Clemente Islands, and to the south of San Nicolas Island, as time permits. Exact sampling locations will be based on the best remote sensing and glider information prior to the cruise, as well as upon the predicted locations of the wind and current wakes based on previous studies in the literature. As a result, the survey design will be flexible and cannot be detailed in advance here. The general area of operations is shown in Figure 1, and a satellite image of the wakes is shown in Figure 1B.
Refer to the final Cruise Instructions pdf for additional information.