Improved Chemical Tracer Simulation by MIROC4.0-based Atmospheric Chemistry-Transport Model (MIROC4-ACTM)

DOI Web Site 10 Citations 33 References Open Access
  • Patra Prabir K.
    Research and Development Center for Global Change (RCGC) Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Institute of Arctic Climate and Environment Research (IACE), JAMSTEC Project Team for Advanced Climate Modeling (ACMPT), JAMSTEC
  • Takigawa Masayuki
    Institute of Arctic Climate and Environment Research (IACE), JAMSTEC Project Team for HPC Advanced Predictions utilizing Big Data, JAMSTEC
  • Watanabe Shingo
    Project Team for Advanced Climate Modeling (ACMPT), JAMSTEC Department of Seamless Environmental Prediction Research (DSEP), JAMSTEC
  • Chandra Naveen
    Research and Development Center for Global Change (RCGC) Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Ishijima Kentaro
    Project Team for HPC Advanced Predictions utilizing Big Data, JAMSTEC
  • Yamashita Yousuke
    Project Team for HPC Advanced Predictions utilizing Big Data, JAMSTEC

Description

<p>The accuracy of chemical tracer simulations by atmospheric general circulation model (AGCM)-based chemistry-transport models (ACTMs) depends on the quality of AGCM transport properties, even when the meteorology is nudged towards the reanalysis fields. Here we show that significant improvements in tracer distribution are achieved when hybrid vertical coordinate is implemented in MIROC4.0 AGCM, compared to its predecessors AGCM5.7b based on sigma coordinate. Only explicitly resolved gravity waves are propagated into the stratosphere in MIROC4-ACTM. The MIROC4-ACTM produces “age-of-air” up to about 5 years in the tropical upper stratosphere (∼1 hPa) and about 6 years in the polar middle stratosphere (∼10 hPa), in agreement with observational estimates. Comparisons of MIROC4-ACTM simulation with observed sulphur hexafluoride (SF6) in the troposphere also show remarkable improvements over the AGCM57b-ACTM simulation. MIROC4-ACTM is characterized by weaker convective mass flux and thus older age of air in the tropical troposphere, relative to AGCM57b-ACTM. The role of convective transport on tracer simulations is depicted using vertical cross-sections of 222Rn (radon) distributions. Both the ACTM versions show similar results when compared with 222Rn measurements at remote sites. All aspects of tracer transport in MIROC4-ACTM is promising for inverse modelling of greenhouse gases sources and sinks at reduced bias.</p>

Journal

  • SOLA

    SOLA 14 (0), 91-96, 2018

    Meteorological Society of Japan

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