I-GEM Kickoff meeting - sorbonne-universite ducharne/gem/PRIVATEanr/IGEM_CESMآ  I-GEM Kickoff...

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Transcript of I-GEM Kickoff meeting - sorbonne-universite ducharne/gem/PRIVATEanr/IGEM_CESMآ  I-GEM Kickoff...

  • I-GEM Kickoff meeting

    National Taiwan University Min-Hui Lo, Chia-Wei Lan

    Rong-You Chien, Ren-jie Wu, Wen-Ying Wu

  • Rain and Snow in CESM

    • In CESM, we used combine precipitation rather than separated rain and snow

    • The freezing point in GPCC was 274.15K, while in CESM, we use 273.15K, thus we add one degree while reading the input precipitation

    • Two approach for CESM precipitation • Linear fraction between 274.15K and 275.15K

    – Rain =prec*frac – Snow=prec*(1-frac)

  • Difference for fraction/no fraction

    RAIN SNOW PRECIPITATION

    ORCHIDEE 0.63% 0.69% 0.537%

    CESM (fraction) 2.85% 17.49% 0.536%

    CESM (no fraction) 34.43% 44.47% 31.64%

  • Comparison for Precipitation

    • ORCHIDEE and SURFEX has pretty similar results, and the difference can be neglectable

    • The difference between CESM/CLM was pretty large

    • In CESM, we filling the Antarctica area with nearest valid points

  • Current progress

    • Control run has been done • Qforce should be figured out • How to make sure the soil

    moisture to be saturated under water table depth are still working

  • Land Sea mask

    • Three models all have different land sea mask – ORCHIDEE has no Antarctica also no island in

    Pacific – SURFEX has Antarctica, also some of the island in

    Pacific – CESM using the area fraction and PFT, so we can

    have data in some of the lake and sea area

  • Different land sea mask

  • Current received data

    SURFEX ORCHIDEE LWdown DelSurfHeat

    Qdis DelSurfStor SWdown Dis

    SWE gpp humrel nobiofrac PFTfrac Qb

    SWE water2infilt

    • ORCHIDEE – Control run only

    • SURFEX – Control – zwt=0.5, 1, 2, 3, 5, 8, 10 – Missing data in zwt=2

    experiment

  • SURFEX results in deep layer

    I-GEM Kickoff meeting Rain and Snow in CESM Difference for fraction/no fraction Comparison for Precipitation Current progress Land Sea mask Different land sea mask Current received data SURFEX results in deep layer