Main Page
CORA stands for COriolis Re-Analysis. It is an oceanographic in situ temperature and salinity dataset on global ocean. [1] [2] [3]
Public documentation about CORA dataset for users.
Contents
Data sources of CORA
CORA dataset is an extraction of the CORIOLIS database at a given date. CORIOLIS database receive oceanographic (physical and chimical) real-time data from global observatories network and delayed-time data from various institutes/consortiums.
Real-time data
- Argo profilers data come from [4]
- OceanSites buoys and moorings data (TAO-TRITON-PIRATA-RAMA moored buoys) come from [5]
- EGO gliders network
- GTSPP surface drifters and thermosalinographs network from [6]
Delayed time data
Coriolis database also retreives delayed time dataset when they are available:
- US NODC (OCL CTDs)
- CIEM (ICES CTDs)
- SeaSurfaceSalinity labelised observatory system for salinographs data
- MEMO labelised observatory system for sea mamals data
Quality Flags meaning
| quality code | meaning |
|---|---|
| 0 | No Quality Check was performed |
| 1 | Good data |
| 2 | Probably good data |
| 3 | Bad data that are potentially correctable |
| 4 | bad data |
| 5 | Value changed |
| 6 | Not used |
| 7 | Not used |
| 8 | Interpolated value |
| 9 | missing value |
Distributed products
- raw data organized in year subdirectories and files sorted per date and per type of file on observation levels + an index permitting quick browsing (CO_DMQCGL01_19930101_PR_XB.nc) also archived per year in .tar or .tar.gz files
- gridded fields (longitude = 720 ;latitude = 545 ;depth = 152 ) created by analysis at the end of the validation process (ex: ARGLV6.1_19930215_fld_TEMP.nc) also archived per year in .tar.gz files
- standardized data sorted per parameter and per month on standard levels (0-2000m 152 levels) (ex: ARGLV6.1_19920115_dat_PSAL.nc) also archived per year in .tar.gz files
Files Format
The used netCDF format is Argo 2.3 (see Argo-NetCDF-sample-files). The number of variables depends of the data type and the instrument.
Each year of the CORA dataset is stored in a subdirectory YYYY (ex: 2011).
Files are sorted by date and by data type: CO_DMQCGL01_YYYYMMDD_PR_TT.nc (ex: CO_DMQCGL01_20111011_PR_PF.nc)
Files types
| |
type of data depending of sensor/platform/source | Comments |
|---|---|---|
| XB | XBT (expendable bathythermograph) high resolution from research vessels | XBT data are also present in TE and BA files |
| BA | data received from the BATHY channel | low resolution data from GTS |
| TE | data received from the TESAC data flow | Low resolution data from GTS |
| OC | US NODC data | |
| PF | argo profiler data | real-time and delayed-mode (adjusted by Principals Investigators) profiles |
| HF | High Frequency data coming from coastal moored buoys (max 3 levels of immersion, <200m, <0.01° of variation in latitude and longitude, more than one measure per day on at least 10 days in a year) | This category concerns about 300 moorings in CORA. |
| CT | CTD data coming from oceanographic vessels or sea mamals or submarine gliders | |
| MO | TAO, TRITON, PIRATA moorings data | |
Data types
| Data type | Files type | Temperature accuracy | Salinity accuracy | Pressure/Depth accuracy |
|---|---|---|---|---|
| XBT | XB, BA, TE | 0.03-0.01°C | |
2% |
| CTD | OC, TE ,BA, CT | 0.001-0.005°C | 0.02-0.003µS cm-1 | 0.015-0.08% |
| XCTD | BA, TE, OC, XB, CT | 0.02°C | 0.05-0.08µS cm-1 | 2% |
| Argo Floats | PF, TE | 0.01°C | 0.01µS cm-1 | 2.4db |
| TAO/TRITON/PIRATA/RAMA | TE, MO, BA | *Standard ATLAS: 0.003-0.03°C (SST) 0.003-0.09°C (subsurface) *Next Gen. ATLAS 0.003-0.02°C | 0.02µS cm-1 | 1db |
| Gliders | CT, TE | 0.001-0.005°C | 0.02-0.003µS cm-1 | N/A |
| Sea mammals | TE , CT | 0.01°c | 0.02µS cm-1 | N/A |
| Drifting buoys | TE, BA | 0.002-0.01°C | 0.003-0.01µS cm-1 | |
| Coastal and other moorings | TE, BA | Nominal 1°C (Achieved 0.08°C) | 0.001µS cm-1 |
User access
Main contact: codac@ifremer.fr
access via MyOcean
The dataset is available on request through MyOcean Service Desk ( registration ) You can also view and download gridded fields without request. Redirected to THREDDS
access ftp
require login and password, ask codac@ifremer.fr ftp CORA
access via THREDDS
THREDDS use OpenDAP architecture.
http://www.ifremer.fr/thredds/dodsC/CORIOLIS-GLOBAL-CORA03-OBS_FULL_TIME_SERIE
access via OceanDataView website
CORA dataset in OceanDataView format available here: ODV dataset soon
CORA versions
Current CORA dataset version is CORA3.2 released in december 2011.
| |
Date of release | Time span | Comments |
|---|---|---|---|
| CORA1.0 | 2007 | 1990-2005 | Beta version of the dataset, full years extracted |
| CORA2.2 | 2009 | 1990-2008 | Add of validation procedures (climatological checks) and gridding of the data |
| CORA3.2 | 2011 | 1990-2010 | Add of validation procedures (duplicate check, XBT depth correction) integration of sea mammals data, automatisation of the update procedure |
| CORA3.3 | beginning of 2012 | 1990-2011 | OceanScience] review, add of year 2011, completion of anomalies feedback from Objective analysis towards CORA dataset and Coriolis database. |
| CORA4.0 | april 2013 | 1990-2012 | add ICES CTD since 1970, integration of time-series of moorings in MyOcean] NetCDF format, update of the whole years |
| CORA4.1 | end 2013 | 1990-2012 | full MyOcean NetCDF format release integrating historical data from SeaDataNet<ref>http://www.seadatanet.org/</ref> project |
FAQ
How to know if a profile is an XBT?
Use the WMO_INST_TYPE variable and compare the value to a table like WMO table. Or use the variable PROBE_TYPE in monthly index files.
How to use julian date?
What to do if I spot anomalies in the netCDF files?
Contact codac@ifremer.fr
Does CORA include data anterior to 1990?
Not yet but it is not excluded in a future release since coriolis databse has data up to 1961.
How to make a reference to CORA dataset?
CORA dataset will have a DOI code soon but if you work with our dataset referre to this article: doi:10.5194/osd-9-1273-2012 C. Cabanes et al. The CORA dataset
Acknowledgement
CORA dataset is produced by Research and Development cell of CORIOLIS project in cooperation with the French CORIOLIS data-center hosted by Ifremer institute.
Current team
- Gilles Reverdin in charge of the scientific prospectives of the team
- Sylvie Pouliquen head of MyOcean<ref>http://www.myocean.eu/</ref> and Coriolis project, manager of the team for operational issues
- Clément de Boyer Montegut doctor in oceanography in charge of the promotion and research part of the project
- Antoine Grouazel engineer in charge of the data processing, collecting new data for Coriolis database and developing algorithm to validate the data.
- Florian Kokosczka doctor
Former members
- Cécile Cabanes doctor main author of CORA article and principal investigator for the first release of CORA dataset.
Contact
codac@ifremer.fr
