| Contributors | Affiliation | Role |
|---|---|---|
| Madin, Laurence P. | Woods Hole Oceanographic Institution (WHOI) | Chief Scientist |
| Horgan, Erich | Woods Hole Oceanographic Institution (WHOI) | Co-Principal Investigator |
| Allison, Dicky | Woods Hole Oceanographic Institution (WHOI BCO-DMO) | BCO-DMO Data Manager |
CTD data collected during MOCNESS-10 deployments. CTD attached to MOCNESS-10 frame.
| File |
|---|
mocness_ctd.csv (Comma Separated Values (.csv), 7.90 MB) MD5:fe6290ebc8d941b8da747803aa5bf20a Primary data file for dataset ID 2918 |
| Parameter | Description | Units |
| cruiseid | cruise identification, e.g. NBP0202, for RVIB Palmer cruise 0202 | |
| temp | temperature of water | degrees C |
| datatype | sampling method - instrument type, e.g. MOCNESS-1 or MOCNESS-10 | |
| year | year | |
| tow | tow number | |
| day_local | day of month, local time, 1-31 | |
| month_local | month of year, local time, 1 - 12 | |
| yrday_local | year day as a decimal, based on Julian calendar, local; includes time due to precision | YYY.Yyyyyy |
| time_local | time, local using 24 hour clock to decimal minutes | HHmm.m |
| press | depth of observation or sample | meters |
| potemp | potential temperature or theta1 ¹Fofonoff and Millard, 1983, UNESCO technical papers in Marine Sciences, #44 | |
| sal | salinity calculated from conductivity, bad values are set to 50 | |
| sigma_0 | potential density1 ¹Fofonoff and Millard, 1983, UNESCO technical papers in Marine Sciences, #44 | |
| angle | angle of net frame relative to vertical (0-89 degrees) | degrees |
| flow | consecutive flow counts | |
| hzvel | horizontal net velocity | m/min |
| vtvel | vertical net velocity | m/min |
| vol_filt | volume filtered | meters<sup>3</sup> |
| net | MOCNESS net number, (00-08) | |
| lat | latitude, negative = South | DD.D |
| lon | longitude, negative = West | DDD.D |
| station | Station number where tow was done. | text |
| flvolt | fluorescence in volts | volts |
| Dataset-specific Instrument Name | Conductivity, Temperature, Depth |
| Generic Instrument Name | CTD - profiler |
| Generic Instrument Description | The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column. It permits scientists to observe the physical properties in real-time via a conducting cable, which is typically connected to a CTD to a deck unit and computer on a ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast.
This term applies to profiling CTDs. For fixed CTDs, see https://www.bco-dmo.org/instrument/869934. |
| Dataset-specific Instrument Name | CTD MOCNESS |
| Generic Instrument Name | CTD MOCNESS |
| Generic Instrument Description | The CTD part of the MOCNESS includes 1) a pressure (depth) sensor which is a thermally isolated titanium strain gauge with a standard range of 0-5000 decibars full scale, 2) A Sea Bird temperature sensor whose frequency output is measured and sent to the surface for logging and conversion to temperature by the software in the MOCNESS computer (The system allows better than 1 milli-degree resolution at 10 Hz sampling rate), and 3) A Sea Bird conductivity sensor whose output frequency is measured and sent to the surface for logging and conversion to conductivity by the software in the computer (The system allows better than 1 micro mho/cm at 10 Hz sampling rate). The data rate depends on the speed of the computer and the quality of the cable. With a good cable, the system can operate at 2400 baud, sampling all variables at 2 times per second. One sample every 4 seconds is the default, although the hardware can operate much faster. (From The MOCNESS Manual) |
| Website | |
| Platform | ARSV Laurence M. Gould |
| Start Date | 2006-02-14 |
| End Date | 2006-03-16 |
| Description | The goal of the LMG06-02 cruise was to continue the studies begun in 2004 (LMG04-14) on the population biology, feeding, and energetics of Salpa thompsoni in the waters near the Antarctic Peninsula. |
This project is also referred to as "B-307: Salpa thompsoni in the Southern Ocean". (B-307 was the USAP project/event number).
NSF Award Abstract:
Salps are planktonic grazers that have a life history, feeding biology and population dynamic strikingly different from krill, copepods or other crustacean zooplankton. Salps can occur in very dense population blooms that cover large areas and have been shown to have major impacts due to the their grazing and the production of fast-sinking fecal pellets. Although commonly acknowledged as a major component of the Southern Ocean zooplankton community, often comparable in biomass and distribution to krill, salps have received relatively little attention. Although extensive sampling has documented the seasonal abundance of salps in the Southern Ocean, there is a paucity of data on important rates that determine population growth and the role of this species in grazing and vertical flux of particulates. This proposed study will include: measurements of respiration and excretion rates for solitary and aggregate salps of all sizes; measurements of ingestion rates, including experiments to determine the size or concentration of particulates that can reduce ingestion; and determination of growth rates of solitaries and aggregates. In addition to the various rate measurements, this study will include quantitative surveys of salp horizontal and vertical distribution to determine their biomass and spatial distribution, and to allow a regional assessment of their effects. Measurements of the physical characteristics of the water column and the quantity and quality of particulate food available for the salps at each location will also be made. Satellite imagery and information on sea-ice cover will be used to test hypotheses about conditions that result in high densities of salps. Results will be used to construct a model of salp population dynamics, and both experimental and modeling results will be interpreted within the context of the physical and nutritional conditions to which the salps are exposed. This integrated approach will provide a good basis for understanding the growth dynamics of salp blooms in the Southern Ocean. Two graduate students will be trained on this project, and cruise and research experience will be provided for two undergraduate students. A portion of a website allowing students to be a virtual participant in the research will be created to strengthen students' quantitative skills. Both PI's will participate in teacher-researcher workshops, and collaboration with a regional aquarium will be developed in support of public education.
| Funding Source | Award |
|---|---|
| NSF Antarctic Sciences (NSF ANT) |