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

Hongyan Zhu , Debra Hudson, Chen Li , Li Shi, Bethan White, Griffith Young, Alison Stirling, Michael Whitall, Adrian Lock, Sally Lavender, Rachel Stratton

Abstract

A new convection scheme, "CoMorph-A", has been introduced into the latest Met Office coupled (GC4) and atmosphere-only (GA8) models. In this study, the impact of CoMorph-A is assessed in atmosphere-only AMIP simulations, as well as in sets of initialized 28-day forecasts with both the coupled and uncoupled models. Initial results show improvements over the Indo-Pacific and North Australian regions, as well as improvements in the rainfall bias, MJO 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 Met Office are continuing to develop CoMorph and will soon release version B.

ES23011  Accepted 24 July 2024

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