Oceanographers normally collect large amounts of data in the course of the work at sea. In the background on most academic research vessels are the sensors deployed to measure meteorological conditions (wind speed and direction, air temperature and barometric pressure, humidity and precipitation, and long and short wave solar radiation) and sea surface conditions (seawater temperature, salinity, and fluorescence) continuously as the ship moves along the trackline from the time it leaves port to when it returns.
On our cruise, additional data are collected continuously by acoustic transducers attached to the hull of the ship to measure backscattering at various frequencies (an indicator of plankton and nekton living in the water column). A hose mounted on the bow pulls in air to measure the partial pressure of CO2 (pCO2) and the water from the uncontaminated seawater line is used to measure pCO2, Dissolved Inorganic Carbon (DIC), and pH continuously. At stations, more data are collected by the instruments deployed over the side of the ship. The CTD/rosette with the Video Plankton Recorder attached deployed to 1000 m, or the CTD/rosette deployed to 3000 m collects pressure, temperature, salinity, fluorescence, oxygen, and light transmission data, and hundreds of Gigabytes of video pictures of plankton. The MOCNESS towed to 1000 m, measures pressure, temperature, and salinity while collecting zooplankton in 8 depth strata between 1000 m and the surface on the up-portion of the tow, and the HammarHead towed body collects broad-band acoustics data as well as pressure, temperature, salinity, and fluorescence at selected depths. The Reeve Net, used to collect animals for live work and other experimental purposes, also has a time-depth recorder to provide a record of the tow.
On our cruise, additional data are collected continuously by acoustic transducers attached to the hull of the ship to measure backscattering at various frequencies (an indicator of plankton and nekton living in the water column). A hose mounted on the bow pulls in air to measure the partial pressure of CO2 (pCO2) and the water from the uncontaminated seawater line is used to measure pCO2, Dissolved Inorganic Carbon (DIC), and pH continuously. At stations, more data are collected by the instruments deployed over the side of the ship. The CTD/rosette with the Video Plankton Recorder attached deployed to 1000 m, or the CTD/rosette deployed to 3000 m collects pressure, temperature, salinity, fluorescence, oxygen, and light transmission data, and hundreds of Gigabytes of video pictures of plankton. The MOCNESS towed to 1000 m, measures pressure, temperature, and salinity while collecting zooplankton in 8 depth strata between 1000 m and the surface on the up-portion of the tow, and the HammarHead towed body collects broad-band acoustics data as well as pressure, temperature, salinity, and fluorescence at selected depths. The Reeve Net, used to collect animals for live work and other experimental purposes, also has a time-depth recorder to provide a record of the tow.
In the lab on the ship more
experimental data are generated in the analysis of the water samples from the
Niskin bottles on the rosette that go to depth open and are closed at specific depths
on the way back to the surface. These include pH, alkalinity, nutrients
(phosphorus, nitrate, nitrite), pCO2, DIC, and Dissolved Organic Carbon
(DOC). Furthermore, on board,
there are the data being generated from physiological, morphological, and
genetic studies being conducted on the pteropods. In order to keep track of
all of the data being collected, an electronic event log (E-Log) is kept that records
the beginning and end of every over the side deployment of the instruments
including the instrument name,
time, ship position, depth of the cast, water depth, station number,
transect number, and person responsible. On this cruise we have an IPad that
can be taken around the ship to where events are happening and used to log the event via a wireless connection to the main event log server. The total amount
of data can be in the 100’s of megabytes to a few terabytes, by the time the
cruise ends. So what happens to all of these data sets at the end of the cruise
and some which are not produced until samples get back to the laboratory for
further analyses?
Gareth Lawson using the IPad to enter a CTD recovery into the E-Log [Photo: P. Wiebe] |
The answer is that the research funds come with a requirement for data
sharing. Since this cruise has
been funded by the biological oceanography section at the National Science
Foundation (NSF), the data must be submitted to an official data repository and
made publically available within a two year time period or sooner if possible.
The repository these data will be submitted to is the Biological and Chemical
Oceanography Data Management Office (BCO-DMO.org) located in Woods Hole, MA.
The BCO-DMO has a mandate to serve principal investigators funded by the NSF
Geosciences Directorate (GEO), Division of Ocean Sciences (OCE) Biological and Chemical
Oceanography Programs, and Office of Polar Programs (OPP) Antarctic Sciences
(ANT) Organisms & Ecosystems Program. The BCO-DMO manages a repository
where marine biogeochemical and ecological data and information developed in
the course of scientific research can easily be stored, protected, and
disseminated on short and intermediate time-frames. Ultimately the data will be
sent to permanent archives like the National Oceanographic Data Center.
Researcher's End Game
When all is said and done
And we are long since gone
What will remain to be distributed
Are the data we contributed
With digital identifiers assigned
And our names clearly defined
Our work will be on-line
Until the end-of-time.
- PHW 16 June 2008
- Peter Wiebe
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