Isac contribution to sst activity
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ISAC Contribution to SST activity. ISAC contribution to SST activity during the first 18 months of Project will coincides with the work funded by MFSTEP and Medspiration: Improving the MFS SST observing system

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ISAC Contribution to SST activity

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Isac contribution to sst activity

ISAC Contribution to SST activity

ISAC contribution to SST activity during the first 18 months of Project will coincides with the work funded by MFSTEP and Medspiration:

  • Improving the MFS SST observing system

  • Providing in NRT daily SST objectively interpolated maps during and after MFSTEP TOP phase

  • Collaborating in in developing the OI methodology for generating L4 UHR products

  • Test and validate the method to the diurnal variation proposed by the GHRSST in the Mediterranean sea. Define the limits of its applicability in within the context of the OI implementation.

  • Define space and time scale scales of the covariance function in the Mediterranean


Isac contribution to sst activity

T H E N E W MFSTEP SST P R O D U C T S f l o w c h a r t

AVHRRdata acquisition and processing

(NOAA satellites)

SST daily composite of

The whole Mediterranean basin

binned on 1/16° x 1/16° Mediterranean model grid

ISAC

SST daily composite of the Atlantic buffer zone + west med

binned on 1/16° x 1/16° Mediterranean model grid

MF

Every Tuesday

Data merging

ISAC

Objective Interpolation

Data delivery on the

GOS-ISAC web-site


Isac contribution to sst activity

SST INTERPOLATION

Some examples of the application of the objectiveanalysis

Sea Surface Temperature 2 April 2003

The new daily SST field will be produced using space/time objective scheme developed by Santoleri et al (1991) to interpolate satellite SST field. This method already successively used by Artale et al (JGR, 2002)to produce daily SST products for assimilation into Mediterranean GCM.

This method takes into account both the presence of continents and islands.

The SST spatial and temporal decorrelation scales takes into account the typical scales of the Mediterranean basin.

Exp (-r/a)2 Exp (-t/b) with a=100 Km and b= 5 days

Test on OI:

1. Daily OI SST on the Mediterranean Basin (2002-2003)

2. Daily OI SST for the Adriatic using the daily product produced by Adricosm


Isac contribution to sst activity

SST INTERPOLATION

Some examples of the application of the objectiveanalysis

Sea Surface Temperature


Isac contribution to sst activity

SST INTERPOLATION

Some examples of the application of the objectiveanalysis

Sea Surface Temperature


Isac contribution to sst activity

Stuart Menteth parametrization

“No skin diurnal model is produced as it is assumed that the diurnal

heating between the skin and sub-skin is almost identical and therefore the sub-skin model can be applied to all satellite measurements.” (GDSv1, rev.1.1)

The day is divided in four parts and six models define the shape of the SST cycle. The predicted diurnal warm layer is referenced to the daily SST minimum.

1. morning cooling 0:00 - time of SST min

2. morning heating time of SST min - 12:00

3. afternoon heating/cooling 12:00 - 17:30  17:00

4. evening cooling 17:0017:30 - 24:00


Isac contribution to sst activity

WP Nº : 2145

Analysis of proposed DV-model performance:

Day minus Night

daily mean bias and rms difference

Day minus Night minus Diurnal

daily mean bias and rms difference

It seems that the method is correcting too much!

What is the factor driving this overestimation?

Night (J+1) minus Night (J)

mean bias and rms difference

Night (J+3) minus Night (J)

mean bias and rms difference


Isac contribution to sst activity

WP Nº : 2145

Analysis of proposed DV-model performance:

problems in low winds areas


Isac contribution to sst activity

WP Nº : 2145

Advanced analysis of DV-model performance:

searching BEST conditions


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