EGU2020-4481
https://doi.org/10.5194/egusphere-egu2020-4481
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Impact of horizontal resolution on the tropical cyclone activity over the western North Pacific in CORDEX-East Asia phase I and II experiments

Dong-Hyun Cha1, Minkyu Lee1, Myoung-Seok Suh2, Eun-Chul Chang2, Joong-Bae Ahn3, Seung-Ki Min4, and Young-Hwa Byun5
Dong-Hyun Cha et al.
  • 1Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea (dhcha@unist.ac.kr)
  • 2Kongju National University, Kongju, Republic of Korea
  • 3Pusan National University, Busan, Republic of Korea
  • 4Pohang University of Science and Technology, Pohang, Republic of Korea
  • 5National Institute of Meteorological Science, Jeju, Republic of Korea

 This study evaluated tropical cyclone (TC) activity simulated by two regional climate models (RCMs) incorporated in the Coordinated Regional Climate Downscaling Experiment (CORDEX) framework with two different horizontal resolutions. Evaluation experiments with two RCMs (RegCM4 and MM5) forced by reanalysis data were conducted over the CORDEX-East Asia domain with 25 km and 50 km horizontal resolutions. The 20-year (19892008) mean performances of the experiments were investigated in terms of TC genesis, track, intensity, and TC-induced precipitation. In general, the simulated TC activities over the western North Pacific (WNP) varied depending on the model type and horizontal resolution. The MM5 tended to simulate more reasonable TC activity compared with the RegCM4. For both models, higher horizontal resolution improved the simulation of TC tracks near the coastal regions of East Asia, whereas the coarse horizontal resolution led to underestimated TC genesis compared with the best track data because of greater convective precipitation and enhanced atmospheric stabilization. In addition, the increased horizontal resolution prominently improved the simulation of TCs landfalling in East Asia and associated precipitation around coastal regions. This finding implies that high-resolution RCMs can produce added value in improving the simulation of TCs over the WNP; thus, they have an advantage in climate change assessment studies.

How to cite: Cha, D.-H., Lee, M., Suh, M.-S., Chang, E.-C., Ahn, J.-B., Min, S.-K., and Byun, Y.-H.: Impact of horizontal resolution on the tropical cyclone activity over the western North Pacific in CORDEX-East Asia phase I and II experiments, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-4481, https://doi.org/10.5194/egusphere-egu2020-4481, 2020

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