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Multi-model statistics shift time coordinate  #665

@LisaBock

Description

@LisaBock

I tried to calculate the multi-model mean of several models with different time axes. So I chose span: full . After that the time axis of the MulitModelMean preproc file has different time points. And it does not fit to the overall time period of the models anymore.
Did I something wrong?
Could anybody help me?
Thanks!

recipe to test:

# ESMValTool
---
documentation:

  description: |
    xxx

preprocessors:

  clim_ref:
    regrid:
      target_grid: reference_dataset
      scheme: linear
    multi_model_statistics:
      span: full
      statistics: [mean]
      exclude: [reference_dataset]



datasets:
  - {dataset: bccr_bcm2_0,  institute: BCCR}
  - {dataset: cccma_cgcm3_1, institute: CCCMA}
  - {dataset: cccma_cgcm3_1_t63, institute: CCCMA}
  - {dataset: csiro_mk3_0, institute: CSIRO, start_year: 1871}
  - {dataset: gfdl_cm2_0, institute: GFDL, start_year: 1861}
  - {dataset: gfdl_cm2_1, institute: GFDL, start_year: 1861} 
  - {dataset: giss_aom, institute: NASA}
  - {dataset: giss_model_e_h, institute: NASA, start_year: 1880}
  - {dataset: giss_model_e_r, institute: NASA, start_year: 1880}
  - {dataset: iap_fgoals1_0_g, institute: LASG}
  - {dataset: ingv_echam4, institute: INGV, start_year: 1870}
  - {dataset: inmcm3_0, institute: INM, start_year: 1871}
  - {dataset: ipsl_cm4, institute: IPSL, start_year: 1860}
  #- {dataset: miroc3_2_hires, institute: NIES, start_year: 1900}
  - {dataset: miroc3_2_medres, institute: NIES}
  #- {dataset: miub_echo_g, institute: MIUB-KMA} #something wrong with numeration of years
  - {dataset: mpi_echam5, institute: MPIM, start_year: 1860}
  - {dataset: mri_cgcm2_3_2a, institute: MRI, start_year: 1851}
  - {dataset: ncar_ccsm3_0, institute: NCAR, start_year: 1870}
  - {dataset: ncar_pcm1, institute: NCAR, start_year: 1890}
  - {dataset: ukmo_hadcm3, institute: UKMO, start_year: 1860}
  - {dataset: ukmo_hadgem1, institute: UKMO, start_year: 1860}
  - {dataset: HadCRUT4, project: OBS, type: ground, version: 1, tier: 2,
     mip: Amon, end_year: 2017}


diagnostics:

  fig_1_cmip3: 
    description: CMIP3 timeseries of near-surface temperature anomalies
    variables:
      tas: 
        preprocessor: clim_ref   
        reference_dataset: HadCRUT4   
        project: CMIP3
        mip: A1
        modeling_realm: atm
        exp: 20c3m
        frequency: mo
        ensemble: run1
        start_year: 1850
        end_year: 1999

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