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Super-parameterization in GRAPES: The construction of SP-GRAPES and associated preliminary results

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Abstract

Super-parameterization (SP) aims to explicitly represent deep convection within a coarse resolution global model by embedding a cloud resolving model (CRM) in each column of the mother model. For the first time, we implemented the SP in a mesoscale regional weather model, the Global/Regional Assimilation and PrEdiction System (GRAPES). The constructed SP-GRAPES uses a two-dimensional (2D) CRM in each grid column. A control and two SP simulations are conducted for the Beijing “7.21” heavy rainfall event to evaluate improvements in GRAPES using SP. The SP-run-I is a basic SP run delivering microphysics feedback only, whereas the SP-run-II delivers both microphysical and cloud fraction feedbacks. A comparison of the runs indicates that the SP-run-I has a slightly positive impact on the precipitation forecast than the control run. However, the inclusion of cloud fraction feedback leads to an evident overall improvement, particularly in terms of cloud fraction and 24-h cumulative precipitation. Although this is only a preliminary study using SP-GRAPES, we believe that it will provide considerable guidance for follow-up studies using SP in China.

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Authors and Affiliations

  1. Chinese Academy of Meteorological Sciences, Beijing, 100081, China

    Feng Zhu  (朱 丰) & Yuhong Wang  (王宇虹)

  2. National Meteorological Center/Numerical Weather Prediction Center, China Meteorological Administration, Beijing, 100081, China

    Feng Zhu  (朱 丰), Guoqiang Xu  (徐国强) & Yuhong Wang  (王宇虹)

  3. College of Global Change and Earth System Science, Beijing Normal University, Beijing, 100081, China

    Xiaohui Zheng  (郑晓辉)

Authors
  1. Feng Zhu  (朱 丰)
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  2. Guoqiang Xu  (徐国强)
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  3. Xiaohui Zheng  (郑晓辉)
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  4. Yuhong Wang  (王宇虹)
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Corresponding author

Correspondence to Guoqiang Xu  (徐国强).

Additional information

Supported by the National Natural Science Foundation of China (41275104), National (Key) Basic Research and Development (973) Program of China (2013CB430106), and National Science and Technology Support Program of China (2012BAC22B02).

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Zhu, F., Xu, G., Zheng, X. et al. Super-parameterization in GRAPES: The construction of SP-GRAPES and associated preliminary results. J Meteorol Res 29, 272–292 (2015). https://doi.org/10.1007/s13351-015-4074-2

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  • DOI: https://doi.org/10.1007/s13351-015-4074-2

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