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Evaluation of cloud hydrometers from Korean Integrated Model (KIM) using multi reanalysis products and satellite observations
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  • Akkisetti Madhulatha,
  • Rae-Seol Park,
  • Jung-Yoon Kang,
  • Tae-Hun Kim,
  • Song-You Hong
Akkisetti Madhulatha
Korea Institute of Atmospheric Prediction Systems

Corresponding Author:a.madhu@kiaps.org

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Rae-Seol Park
Korea Institute of Atmospheric Prediction Systems
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Jung-Yoon Kang
Korea Institute of Atmospheric Prediction Systems
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Tae-Hun Kim
Korea Institute of Atmospheric Prediction Systems
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Song-You Hong
Korea Institute of Atmospheric Prediction Systems
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Abstract

Validation of cloud hydrometeors simulation from the global models is important issue as it pertains to the accuracy of climate predictions. In this study, the cloud hydrometeor data from Korean Integrated Model (KIM) is validated using different Reanalysis (ERAI, ERA5, and MERRA) and Satellite Observations (Cloudsat). In ERA5 products, cloud snow water and rain water are also available. Satellite observations are gridded to compare with model simulations. Cloud liquid water (Qc), Cloud snow water (Qs), Cloud ice water (Qi), Cloud rain water (Qr), Vapour mixing ratio (Qv) for January (dry) and July (wet seasons) of 2017 are considered for validation. BIAS and RMSE are calculated for comparison. To understand the vertical distribution of hydrometeors, contour frequency altitude diagrams (CFADs) are plotted. Early validation of KIM hydrometeors shows the reasonable estimate of different hydrometeors with KIM model showing more Qc at surface, more Qv at upper levels. The vertical structure of Qi has showed significant bias at upper levels with model showing large ice values at higher levels. ERAI and ERA5 products has showed distinct pattern of Qi due to different configurations. More Qs at upper levels is also evident in model simulations. Combined distribution (Qc+Qi) of KIM at lower (upper) levels is more comparable with ERA5 (MERRA) products. Further, Qr distribution shows underestimation at the equator and over estimation at the latitude belts. To examine the contribution of different physics modules related to the bias, the hydrometeors from cumulus, microphysics and shallow convection are also analyzed separately. Accuracy of KIM simulated cloud hydrometeors against different products and possible causes for biases will be discussed in the conference.