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titlesolution
retrieve, 
    type    = ob, 
obsgroup= con, obstype = ssd,
# obstype = 9/11/12/13/14/19/21/22/23/180/181/182,
    date date    = 20150201, 
    time    = 00,
    range   = 1439,
    target  = "obs.bufr"

Ensemble forecasts

Retrieve the surface 2 metre temperature fields field of the first 10 members of yesterday's 12 UTC ensemble prediction (type: perturbed forecast) for the next 3 days at noon. > see in MARS Catalogue

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titlesolution
retrieve,
    class    = od,
    stream   = ef,
    type     = perturbed forecast,
    levtype  = sfc,
    repres   = gg,
    date     = -1,
    time     = 12,
    ensemble = 1/to/10,
    step     = 48/to/96/by/24,
    param    = st,167.128, 
target = "ensemble"

Retrieve the same for the control forecast. > see in MARS Catalogue

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titlesolution
retrieve,
    class   = od,
    stream  = ef,
    type    = control forecast,
    levtype = sfc,
    repres  = gg,
    date    = -1,
    time    = 12,
    step    = 48/to/96/by/24,
    param   = st167.128,
    target  = "ensemble.cf"

ERA

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5

Retrieve the vertical integral of eastward and northward heat flux as monthly means of daily means on a 1.125 by 1.125 degree latitude/longitude grid over Europe from the ERA 40 5 archive for January 1964 > see in MARS Catalogue

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titlesolution
retrieve,
    class   = e4ea,
    stream  = modaoper,
    type    = an,
    levtype = sfc,
    date    = 19640101 1964-01-01,
expver = 1,
time = 00/to/23, param = 69.162/70.162, area = europe, grid = 1.125/1.125, target = "e4ea_moda_fluxes.grb"

Retrieval of snow depth from the ERA -40 5 archive for November 1993, for all analysis base times > see in MARS Catalogue. How many fields are requested?

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titlesolution
retrieve,
  class   = e4ea,
  stream  = oper,
  expver  = 1,
  date    = 19931101/to/19931130,
  time    = 00/06to/12/1823,
  type    = an,
  levtype = sfc, 
  param   = sd141.128,
  repres  = gg,
  target  = "era40era5.199311.sd"
#                                  It retrieves 30 x 424 = 120720 fields.


See also these Web API retrieve examples for ERA-Interim, S2S, TIGGE, ERA-20C etc.