Abstract:

This dataset contains minimally processed physical data from the ISIIS sensors collected during the spring of 2016 aboard research vessel Point Sur. Data was collected from March 30 to April 11 as part of the CONCORDE program. The physical files correspond to established corridors (or transects) named "ECORR", "WCORR", and MCORR, for East, West, and Middle corridors, respectively. The "ARRAY" transect corresponds to the transects carried out around the CONCORDE Mixing Array. In total, there were seven full transects during the fall cruise: one on the ECORR, two on WCORR and, three on MCORR, and one on the ARRAY. All tows were carried out in daylight, for approximately 5 hours each and centered around local noon.

Suggested Citation:

Briseño-Avena, Christian, Greer, Adam T., Cowen, Robert K., Graham, William M.. 2017. In Situ Ichthyoplankton Imaging System (ISIIS) Raw Physical Data Set Spring 2016. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N79K48ND

Publications:

Greer, A., Chiaverano, L., Ditty, J., & Hernandez, F. (2019). In situ observations of fish larvae encased within a pelagic gelatinous matrix. Marine Ecology Progress Series, 614, 209–214. doi:10.3354/meps12916

Greer, A. T. (2018). In-Situ Shadowgraph Imaging. Marine Technology Society Journal, 52(6), 62–65. doi:10.4031/mtsj.52.6.5

Purpose:

The dataset was developed to provide environmental data to study plankton distributions in the river-dominated region of the Northern Gulf of Mexico.

Data Parameters and Units:

CRUISE_ID = research cruise unique identifier. TRANSECT_ID = Name assigned to the transect, usually indicating the type of study. TRANSECT_NUMBER = unique number assigned to each deployment of ISIIS. YEAR_CDT = year when data was collected. Central Daylight Time, U.S.A. MONTH_CDT = month when data was collected. Central Daylight Time, U.S.A. DAY_CDT = day when data was collected. Central Daylight Time, U.S.A. HOUR_CDT = hour when data was collected. Central Daylight Time, U.S.A. MINUTES_CDT = minute when data was collected. Central Daylight Time, U.S.A. SECONDS.FFF_CDT= seconds and fractions of a second when data was collected. Central Daylight Time, U.S.A. UNIX_timestamp = original timestamp, in UNIX format and in UTC. LATITUDE_DEGREES = latitude in degrees. LONGITUDE_DEGREES = longitude in degrees. Negative values indicate latitude west. DEPTH_M = depth in meters TEMPERATURE_DEG_C = Water temperature in degrees Celsius. SALINITY = Salinity (Practical Salinity). FLUORESCENCE_VOLTS = Fluorescence Intensity, in Volts. PAR_uE_PER_M2 = Photosynthetic Active Radiation in microEinsteins per meter square. O2_mg_PER_L = Dissolved Oxygen concentration in mg per liter DENSITY_Sigma = Water density in sigma format (in situ water density - 1000 kg/m^3). Derived from ISIIS temperature, salinity, and pressure data and using the salt water equations for matlab.

Methods:

ISIIS was typically deployed on an undulation mode (also referred to as tow-yo) from 1 meter below the surface to 4 m above the seafloor at a speed of 5 knots (2.5 m/s). Velocity is through the water (as opposed to speed over ground).

Instruments:

The In Situ Ichthyoplankton Imaging System (ISIIS) is a towed camera system. The system is towed behind a research vessel at at speed of 5 knots (2.5 m/s). Once deployed, the system can "fly" automatically at the specified depths, usually undulating between 1 m below the surface to 4 meters above the seafloor, or to a maximum depth of 150 m. A suite of physical sensors collect environmental information simultaneously. Sensors include a mirco Doppler velocity log (microDVL, 600 micro, Navquest), a CTD (SBE 49, Sea-Bird Electronics, Inc.), a fluorometer (ECo FL RT, Wetlabs), a PAR sensor (QCP2300), and a dissolved oxygen sensor (SBE 43, Sea-Bird Electronics, Inc.).

Error Analysis:

Missing values are marked -999 It should be noted that CSIRO seawater equations (2014 revision used here to estimate water density) has been replaced by the TEOS-10.

Provenance and Historical References:

Data was collected aboard R/V Point Sur between March 30 and April 4, 2016.

Individual Files: