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  Realistic precipitation diurnal cycle in global convection-permitting models by resolving mesoscale convective systems

Song, J., Song, F., Feng, Z., Leung, L. R., Li, C., & Wu, L. (2024). Realistic precipitation diurnal cycle in global convection-permitting models by resolving mesoscale convective systems. Geophysical Research Letters, 51: e2024GL109945. doi:10.1029/2024GL109945.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000F-9922-E Version Permalink: https://hdl.handle.net/21.11116/0000-000F-9926-A
Genre: Journal Article

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Geophysical Research Letters - 2024 - Song - Realistic Precipitation Diurnal Cycle in Global Convection‐Permitting Models.pdf (Publisher version), 5MB
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Geophysical Research Letters - 2024 - Song - Realistic Precipitation Diurnal Cycle in Global Convection‐Permitting Models.pdf
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2024
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 Creators:
Song, Jinyan, Author
Song, Fengfei, Author
Feng, Zhe, Author
Leung, L. Ruby, Author
Li, Chao1, Author                 
Wu, Lixin, Author
Affiliations:
1Director’s Research Group, Department Climate Variability, MPI for Meteorology, Max Planck Society, ou_913553              

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Free keywords: precipitation; diurnal cycle; global convection-permitting models; mesoscale convective systems; amplitudephase
 Abstract: Accurately representing the precipitation diurnal cycle has long been a challenge for global climate models (GCMs). Here we evaluate the precipitation diurnal cycle in the DYAMOND global convection-permitting models (CPMs) and CMIP6 HighResMIP models. Comparison of the high- (25-50 km) and low-resolution (100-250 km) models with parameterized convection in HighResMIP shows that simply increasing model resolution does not noticeably improve the precipitation diurnal cycle. In contrast, CPMs can better capture the observed amplitude and timing of precipitation diurnal cycle. However, the simulated spatial variation of timing in CPMs is smaller than observed, leading to an exaggeration of the spatially averaged diurnal amplitude. The better-simulated precipitation diurnal cycle in the CPMs is tied to mesoscale convective systems (MCSs), which contribute about half of the total precipitation. The observed life cycle of MCSs, including initiation and mature stages, is well captured in the CPMs, leading to a more realistic precipitation diurnal cycle.

As a basic mode of climate variability, the diurnal cycle is a key metric that has been used to benchmark climate models. The current state-of-the-art GCMs struggle to accurately represent the precipitation diurnal cycle, frequently peaking too early compared to the observations. Due to the coarse resolution and the use of convection parameterization, GCMs are also unable to simulate organized convective storms, which often exhibit a distinct diurnal cycle. With the emergence of global storm-resolving models at kilometer-scale resolution, this study evaluates the diurnal cycle of precipitation simulated by global storm-resolving models and high-resolution GCMs. We find that at resolutions between similar to 25 and 250 km, increasing resolution has limited effects on the precipitation diurnal cycle but global CPMs can reproduce the observed precipitation diurnal cycle much better as they can better represent organized convective storms.

Precipitation diurnal cycle is systematically evaluated in DYAMOND simulations from global convection-permitting models (CPMs) and CMIP6 models Both the amplitude and phase of the precipitation diurnal cycle are better simulated by CPMs than CMIP6 high-resolution models The global CPMs excel in reproducing the precipitation diurnal cycle owing to better simulated mesoscale convective systems

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Language(s): eng - English
 Dates: 2024-05-142024-01-162024-06-242024-07-16
 Publication Status: Issued
 Pages: 12
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2024GL109945
 Degree: -

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Project name : National Natural Science Foundation of China (NSFC)
Grant ID : -
Funding program : -
Funding organization : -
Project name : Science and Technology Innovation Project
Grant ID : -
Funding program : (LSKJ202202201)
Funding organization : Laoshan Laboratory
Project name : -
Grant ID : -
Funding program : (LSKJ202300302)
Funding organization : Laoshan Laboratory
Project name : Water Cycle and Climate Extremes Modeling (WACCEM) scientific focus area
Grant ID : -
Funding program : -
Funding organization : Regional and Global Model Analysis program area/U.S. Department of Energy Biological and Environmental Research
Project name : -
Grant ID : -
Funding program : (EXC2037)
Funding organization : Excellence CLICCS, University of Hamburg
Project name : -
Grant ID : -
Funding program : -
Funding organization : Deutsche Forschungsgemeinschaft (DFG)
Project name : ESiWACE
Grant ID : 675191
Funding program : -
Funding organization : European Union's Horizon 2020
Project name : ESiWACE2
Grant ID : 823988
Funding program : -
Funding organization : European Union's Horizon 2020
Project name : -
Grant ID : -
Funding program : Pacific Northwest National Laboratory (PNNL) (AC05‐76RL01830)
Funding organization : Battelle Memorial Institute
Project name : -
Grant ID : -
Funding program : National Energy Research Scientific Computing Center (DE‐ AC02‐05CH11231)
Funding organization : -
Project name : -
Grant ID : -
Funding program : Water Cycle and Climate Extremes Modeling (WACCEM) scientific focus area (m1867)
Funding organization : Regional and Global Model Analysis program area

Source 1

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Title: Geophysical Research Letters
  Abbreviation : GRL
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Washington, D.C. : American Geophysical Union / Wiley
Pages: - Volume / Issue: 51 Sequence Number: e2024GL109945 Start / End Page: - Identifier: ISSN: 0094-8276
CoNE: https://pure.mpg.de/cone/journals/resource/954925465217