1997 - 1997 Centre for Environment, Fisheries & Aquaculture Science (Cefas) RV CIROLANA 06/1997 High Resolution Conductivity-Temperature-Depth (CTD) Data
The data in this archive were collected from CEFAS (Or DFR) research cruises. They broadly cover the European Shelf with some data from the Iberian Abyssal Plain. Data were collected using the lowered CTD rosette system which is used when the vessel is stationary. Usually bottles were fired at particular depths and samples taken for calibration. In early years only a limited set of parameters were collected. Notably Pressure (Depth), Temperature and Conductivity (CTD). From Conductivity Salinity can be calculated using the UNESCO 1978,1983 formulations . In subsequent years more sensors have been added, notably fluorometers, Optical back scatter or transmissometers and Light (PAR, photo synthetically available radiation). The exact configuration varies between cruises and this is reflected in the data format of the output files. Data was collected from research vessels on station, a profile from the surface to near the sea bed is undertaken. The down cast data should be a clean profile. Water bottles for sample collection and calibration are fired on the up cast.
dataset
http://data.cefas.co.uk/#/View/879/
function: order
CEFASae10e759-54fa-42a6-896c-e6cfd6fc24fe
http://www.cefas.co.uk/
eng
OGP
urn:ogc:def:crs:EPSG::4326
oceans
revision
2011-03-25
publication
2008-06-01
publication
2008-06-01
-8
5
57.75
48.5
revision
2010-05-18
1997-06-30
1997-07-21
publication
2020-01-02
notPlanned
Data was collected via the CTD rosette system using either a Guildine CTD or from approximately 1993 an Falmouth Scientific Instruments Integrated CTD. In addition to the CTD, additional instruments are Sea Point Fluorometers, Dr Haardt Fluorometers, Transmissometers, Sea Point Optical Backscatter, LICOR Light Sensors (PAR) Instruments were usually calibrated where possible before the cruise and post cruise, in a water bath, for Temperature and using a pressure test vessel for pressure. Calibrations for Salinity were performed with reference to Salinity samples collected. Calibration of the fluorescence to generate chlorophyll was by comparison to the collected samples. Similarly suspend load would be calibrated to samples collected and filtered. The light sensor was calibrated in a dark light box. The specific calibration values (where available) are stored with each cruise data set. Processing of the data was initially performed using the instrument specific programs to generate ASCII files (e.g FSIpost) a suite of programs developed at CEFAS was then used to generate calibrated files and generate the processed information. High resolution data is stored as .txt files where possible, however as not all calibrated high resolution data is available processed, the original data files (binary - *.raw, *.edt, *.hdr *. C00) will be stored instead. These binary files require the original processing software to process (see separate document.) +------------+---------+--------------------------------+ |Pres |DBAR |Pressure in Dbar | +------------+---------+--------------------------------+ |Temp |Deg C |Temperature in Celsius | +------------+---------+--------------------------------+ |SALT | |Salinity (PSS 78) | +------------+---------+--------------------------------+ |PTEMP |Deg C |Potential Temperature | +------------+---------+--------------------------------+ |SNDVEL |m/sec |Sound Velocity | +------------+---------+--------------------------------+ |SIG-TH |KG/m3 |Density Sigma theta | +------------+---------+--------------------------------+ |SIGM |KG/m3 |Density Sigma T | +------------+---------+--------------------------------+ |SVAN |10*8 |Specific Volume Anomaly | +------------+---------+--------------------------------+ |DYNHT |m |Dynamic Height | +------------+---------+--------------------------------+ |BVF |CPH |Brunt Vaisala Frequency | +------------+---------+--------------------------------+ |Depth |m |Depth (integrated from density) | +------------+---------+--------------------------------+ |Transmission|raw | | | |volts | | +------------+---------+--------------------------------+ |Susp Load |mg/l |Calibrated transmission (or | | | |OBS) | +------------+---------+--------------------------------+ |RADI |lng A |raw light sensor | +------------+---------+--------------------------------+ |PAR |uE/M2/S |Calibrated light | +------------+---------+--------------------------------+ |Fluor |Volt |Uncalibrated fluorometer | +------------+---------+--------------------------------+ |Chl |mg/m3 |Calibrated fluorometer | +------------+---------+--------------------------------+
Public data (Crown Copyright) - Open Government Licence Terms and Conditions apply
Public data (Crown Copyright) - Open Government Licence Terms and Conditions apply
Data Manager
Centre for Environment, Fisheries & Aquaculture Science
Cefas Lowestoft Laboratory
Pakefield Road
Lowestoft
NR33 0HT
UK
+44 (0)1502 562244
originator
Data Manager
Centre for Environment, Fisheries & Aquaculture Science
Cefas Lowestoft Laboratory
Pakefield Road
Lowestoft
NR33 0HT
UK
+44 (0)1502 562244
custodian
Data Manager
Centre for Environment, Fisheries & Aquaculture Science
Cefas Lowestoft Laboratory
Pakefield Road
Lowestoft
NR33 0HT
UK
+44 (0)1502 562244
pointOfContact
2020-01-02T14:15:22