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Atlantic and global products

C. Coatanoan, F. Gaillard, E. Autret, T. C. Coatanoan, F. Gaillard, E. Autret, T. LoubrieuLoubrieu

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Objective Analysis

Goals :Goals :

To realize a quality control of the data (by Coriolis)To realize a quality control of the data (by Coriolis)

To provide a view of the base content and evolution of the To provide a view of the base content and evolution of the in-in-situsitu observation network (not only ARGO) observation network (not only ARGO)

To follow in real time the evolution of the temperature and To follow in real time the evolution of the temperature and salinity fieldssalinity fields

Products :Products :

Alert system (only for the data centre)Alert system (only for the data centre)

Map (by browser in free access)Map (by browser in free access)

Reduced data on standard levels (FTP – controlled access)Reduced data on standard levels (FTP – controlled access)

3-D fields (FTP – controlled access)3-D fields (FTP – controlled access)

Coriolis data centre - objective analysis

developed by Emmanuelle Autret and Fabienne Gaillard (Ifremer).

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Objective Analysis

DataTemperature and salinity profiles collected and controlled in real time by CORIOLIS from Argo profilers, GTS, buoys, moorings, or oceanographic vessels (XBT, XCTD, CTD).

Analysis over the North Atlantic (20°S-70°N, 100°W-20°E) (October 2002 to December 2003)

Weekly analysisT & S fields

•On a grid with 1/3° resolution (PSY1-Mercator)•At 51 levels down to 2000 m

Analysis residuals for each observation

Analysis over the Atlantic (20°S-70°N, 100°W-20°E) December 2003 to March 2005Analysis over the Atlantic (70°S-70°N, 100°W-40°E) January to April 2005

Analysis over the Global Ocean (run in operational mode since May 2005)

Using, from the CORIOLIS data base, the temperature and salinity profiles controlled during the last 4 weeks, real time analysis are performed once a day.

Weekly and daily analysisT & S fields

•On a grid with 1/2° resolution•At 59 levels down to 2000 m

Analysis residuals for each observation

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1 week

Weekly analysis:Std_data, Maps

Residuals

Sensors monitoring,Correction estimates

12 months

Data base

1-10 years

Scientific Re-analysis: Stable raw and std datasets

Update of ClimatologyOcean variability studies

1 dayDaily analysis

Std_data

Residuals

T and S Maps

Vertical Interpolation on standardlevelsMerging of over sampled data

Optimal Interpolation in horizontal(departure from monthly climatology)

Raw data

Operating modes of the analysis system

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Daily Analysis

Back to the base to check and correct quality indicator

Database

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Objective analysis

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Every Wednesdays, 4 analysis with the estimation days d, d-7,d-14, d-28 are Every Wednesdays, 4 analysis with the estimation days d, d-7,d-14, d-28 are produced. Each analysis takes into account the profiles measured within  -21/+21 produced. Each analysis takes into account the profiles measured within  -21/+21 days around the estimation date interval. days around the estimation date interval.

http://www.ifremer.fr/co/co0525/en/global/

http://www.coriolis.eu.org/cdc/

Objective analysisGlobal ocean

Weekly analysis

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Data extraction

(by year)

Row data files NetCDF

Standardised

level files

Objective analysisT & S

« Clean » analyses

Calculated residuals

Visual control

Extraction of the data =

output of the alert system

Update

T & S Fields2002 - 2005

Alert files

New external submissions (Argo)

Diffusion

New anomaliesfrom

Coriolis R & D

Re-analysis (yearly analysis)

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ApplicationsApplications

1) Climatological study in the north Atlantic (0-70°N, 100°W-20°E)

2) Climatology from the available data

3) Qualification of ARGO floats in delayed mode

Re-analysis - Principle

Dataset soon available by ftpDataset soon available by ftp

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Objective Analysis

Quality control : a few data ….Quality control : a few data ….

DailyDaily

Each day, a mean of 60 profiles needs to be controlled by an operator before going back to the loop of the data for the diffusion.

At least, one half of this dataset needs to be corrected.

WeeklyWeekly

About 7000 profiles is provided each week to the modellers.

YearlyYearly

For each year-analyse, hundreds of data have been re-controlled from the alert system.

To summarize…To summarize…

The objective analysis with alert system is exploited by the CORIOLIS data centre in real time. It is also set up in delayed mode to produce re-analysis used for the qualification of the ARGO floats or climatological studies.

The version "V3" exploited since December 2003 produces every Wednesdays, temperature and salinity fields at 59 levels from 5 down to 2000 m. The levels: 10, 100, 300, 1000 and 1600 m are presented by the  "quick-look browser".  The maps can also be drawn with  "Live Access Server".

This version also runs daily for the qualification of the dataset.

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Objective Analysis http://www.coriolis.eu.org/cdc/objective_analyses.htm

Works in progressWorks in progress

- Climatology- Climatology

- Climate change indicators- Climate change indicators

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