The Convective-To-Total Precipitation Ratio and the “Drizzling” Bias in Climate Models

Chen, Di; Dai, Aiguo; Hall, Alex

doi:10.1029/2020JD034198

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The Convective-To-Total Precipitation Ratio and the “Drizzling” Bias in Climate Models

2021
By Chen, Di ; Dai, Aiguo ; Hall, Alex
Source: JGR Atmospheres 126(16): e2020JD034198

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Journal Title:

JGR Atmospheres
Personal Author:

Chen, Di ; Dai, Aiguo ; Hall, Alex

Chen, Di ; Dai, Aiguo ; Hall, Alex Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office)

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) Less -
Description:

Overestimation of precipitation frequency and duration while underestimating intensity, that is, the “drizzling” bias, has been a long-standing problem of global climate models. Here we explore this issue from the perspective of precipitation partitioning. We found that most models in the Climate Model Intercomparison Project Phase 5 (CMIP5) have high convective-to-total precipitation (PC/PR) ratios in low latitudes. Convective precipitation has higher frequency and longer duration but lower intensity than non-convective precipitation in many models. As a result, the high PC/PR ratio contributes to the “drizzling” bias over low latitudes. The PC/PR ratio and associated “drizzling” bias increase as model resolution coarsens from 0.5° to 2.0°, but the resolution's effect weakens as the grid spacing increases from 2.0° to 3.0°. Some of the CMIP6 models show reduced “drizzling” bias associated with decreased PC/PR ratio. Thus, more reasonable precipitation partitioning, along with finer model resolution should alleviate the “drizzling” bias within current climate models.
Keywords:

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Climatology Mathematical Models Precipitation (Meteorology)
Source:

JGR Atmospheres 126(16): e2020JD034198
DOI:

https://doi.org/10.1029/2020JD034198
Document Type:

Journal Article
Funding:

Grant no. NA18OAR4310425
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Submitted
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urn:sha256:8219872586e999455ed18c9d7f1bb887bb41bcfc8e954dd97766fd7eb745ce3a
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https://repository.library.noaa.gov/view/noaa/44718/noaa_44718_DS1.pdf
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