6. Ocean Archive

The operational ocean analysis is archived in the MARS mars under stream=OCEA, and expver=0001 and system=3

As for all the ocean data archived in MARS, the leveltype=depth (dp).

The ocean reanalisys is archived as type=OR

The realt ime ocean analysis is archived as type=AN

Time and date atributes

For the ocean analysis and reanalysis products, time=0,step=0, and date=YYYYMMDD as the verifying date.

Parameters

The ocean data is archived in GRIB using the ECMWF local table 2 version 151 and GRIB extension in definition 4. The most common parameters are:

• 129 for potential temperture
• 130 for salinity
• 131 for zonal velocity
• 132 for meridional velocity
• 133 for vertical velocity
• 145 for sea level
• 163 for depth of 20 degree isotherm
• 148 for mixed layer depth
• 164 for averaged temperature in upper 300m
• 175 for averaged salinity in upper 300m
• 153 for zonal wind stress
• 154 for meridional wind stress

Time products

There are different time products:

• PROD=INST for instantaneous fields.
• PROD=TACC for accumulated fields (only for OR).
• PROD=TIMS for timeseries (only for Reanlysis) .
• PROD=TAVG for time averaged fields

Spatial Sections

There are different spatial sections:

• SEC=H for horizontal fields (i.e. x-y sections)
• SEC=Z for zonal sections (x-z or z-time)
• SEC=M for meridional sections (y-z or y-time)
• SEC=V for vertical sections (z-time)

Other Attributes

• method=1 (for data assimilation initialization)
• number=0 for centered unperturbed analysis.(n=1/2/3/4 for the perturbed analysis)
• system=3 (system 3 operational analsyis)
• levellist: needed for H sections
• latitude: needed for Z sections
• longitude: needed for M sections
• range: time range (in hours) need for TIMS and TAVG products.

Examples

• Mars retrieval of Sea Surface Temperature and Surface Salinity from the real time analysis, for the 2nd of March 2007. Only the centered analysis (number=0):

  retrieve,
  number=0,
  system=3,
  time=00:00:00,
  date=2007-03-02,
  section=h,
  levtype=dp,
  method=1,
  param=129.151/130.151,
  levelist=5.0,
  stream=ocea,
  expver=1,
  type=an,
  product=inst,
  class=od

• Mars retrieval of accumulated sea level and depth of 20 deg Isotherm from the ocean reanalysis for the 1st November 1982:

  retrieve,
  number=0,
  system=3,
  time=00:00:00,
  date=1982-11-01,
  section=h,
  levtype=dp,
  method=1,
  param=163.151/145.151,
  levelist=0,
  stream=ocea,
  expver=1,
  type=or,
  product=tacc,
  class=od

• Mars retrieval of an intantaneous zonal section of temperature along the equator, from the reanalysis, all 5 ensemble members:

  retrieve,
  number=0/1/2/3/4,
  system=3,
  time=00:00:00,
  date=1982-11-01,
  stream=ocea,
  section=z,
  latitude=0,
  levtype=dp,
  expver=1,
  method=1,
  class=od,
  product=inst,
  type=or,
  param=129.151

• Mars retrieval of an instantaneous meridional section of zonal velocity at 140W, from the realtime analysis. The user needs to indicate the closer model longitude:

  retrieve,
  longitude=220.078,
  number=0,
  system=3,
  time=00:00:00,
  date=1982-11-07,
  stream=ocea,
  section=m,
  levtype=dp,
  expver=1,
  method=1,
  type=or,
  product=inst,
  class=od,
  param=131.151

• Mars retrieval of timesies of averaged temperature in the upper 300m along the equator from the reanalysis, for the period 19870101-19870201:

  retrieve,
  number=0,
  system=3,
  time=00:00:00,
  date=1987-02-01,
  range=720,
  section=z,
  latitude=0,
  levtype=dp,
  method=1,
  param=164.151,
  levelist=0,
  stream=ocea,
  expver=1,
  product=tims,
  type=or,
  class=od