Impacts of the new UM convection scheme, CoMorph-A, over the Indo-Pacific and Australian regions

Article

Zhou, Hongyan, Hudson, Debra, Li, Chen, Shi, Li, White, Bethan, Young, Griffith, Stirling, Alison, Whitall, Michael, Lock, Adrian, Lavender, Sally and Stratton, Rachel. 2024. "Impacts of the new UM convection scheme, CoMorph-A, over the Indo-Pacific and Australian regions." Journal of Southern Hemisphere Earth Systems Science. 74 (3). https://doi.org/10.1071/ES23011
Article Title

Impacts of the new UM convection scheme, CoMorph-A, over the Indo-Pacific and Australian regions

ERA Journal ID1958
Article CategoryArticle
AuthorsZhou, Hongyan, Hudson, Debra, Li, Chen, Shi, Li, White, Bethan, Young, Griffith, Stirling, Alison, Whitall, Michael, Lock, Adrian, Lavender, Sally and Stratton, Rachel
Journal TitleJournal of Southern Hemisphere Earth Systems Science
Journal Citation74 (3)
Article NumberES23011
Number of Pages18
Year2024
PublisherCSIRO Publishing
Place of PublicationAustralia
ISSN1836-716X
2206-5865
Digital Object Identifier (DOI)https://doi.org/10.1071/ES23011
Web Address (URL)https://www.publish.csiro.au/ES/ES23011
AbstractA new convection scheme, ‘CoMorph-A’, has been introduced into the latest UK Met Office coupled (GC4) and atmosphere-only (GA8) models. In this study, the impact of CoMorph-A is assessed in atmosphere-only Atmospheric Model Intercomparison Project simulations, as well as in sets of initialised 28-day forecasts with both the coupled and uncoupled models. Initial results show improvements over the Indo-Pacific and northern Australian regions, as well as improvements in the rainfall bias, Madden–Julian Oscillation simulation and prediction, tropical cyclone forecasts and the diurnal cycle of rainfall over the Maritime Continent. The improvements are mostly consistent across the initialised forecasts and the climate simulations, indicating the effectiveness of the new scheme across applications. The use of this new convection scheme is promising for future model configurations, and for improving the simulation and prediction of Australian weather and climate. The UK Met Office is continuing to develop CoMorph and will soon release version B.
KeywordsAustralia weather and climate; CoMorph; convection scheme; diurnal cycle; Madden–Julian Oscillation; MJO; model biases; tropical cyclone; UK Met Office global mode; UM
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 20203702. Climate change science
Byline AffiliationsAustralian Bureau of Meteorology
Met Office, United Kingdom
Centre for Applied Climate Sciences
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