As understanding and improving the modeling of diurnal and sub-diurnal precipitation processes can have a broad impact on the fidelity of climate simulations, this proposed GASS project focuses on advancing the model capability through multimodel intercomparison studies against observations using a hierarchical modeling framework.
The overall goals are to:
understand what processes control the diurnal and sub-diurnal variation of precipitation over different climate regimes in observations and models and,
identify the deficiencies and missing physics in current Global Climate Models (GCMs) to gain insights for further improving the parameterization of convection in GCMs.
Potential research themes are:
Interaction between convection and water vapor
Nocturnal convection over land
Diurnal cycle of convection over ocean
Convection transition
Approach:
A hierarchical model approach including Single-Column Model (SCM), Cloud-Resolving Model (CRM), Large-Eddy Simulations (LES), Regional model, and GCM.
Case studies vs. statistical studies
Short-range hindcasts vs. climate simulations
Current Status:
Participating Models:
– 11 SCMs (E3SM, E3SM-Trigger, E3SM-SILHS, SCAM5/6, SAM0-UNICON, SKIM, CMC, SMCPCP, ICON, TaiESM) from 8 model groups
– 2 CRMs (MONC and DWD)
– 9 GCMs and 2 RGCMs (CAM6-CTL, CAM6-Trig, CMCGEM, ECMWF-IFS, E3SMv2, E3SMv2-CAPETrig, MPAS, TaiESM1, UMGA7, UMGA8, NUIST-WRF) from 8 model groups.
The multi-year long-term SCM intercomparison study over the ARM SGP and Amazon (MAO) sites completed. A summary paper is published in QJRMS.
The GCM intercomparison results are being actively analyzed. A manuscript will be ready for co-author internal review soon.
Need project leads for the CRM and LES intercomparison study.
Publications
Tang, S., Xie, S., Guo, Z., Hong, S.-Y. et al. (2022). Long-term single-column model intercomparison on diurnal cycle of precipitation over mid-latitude and tropical land, Quart J Roy Meteor Soc 1–29.
Tao, C., Xie, S., Ma, H.-Y. et al. (2023): Diurnal Cycle of Precipitation Over Tropical and Midlatitude Lands: GCM Inter-Comparison. In Preparation.
More information on the modeling approach, participation, timelines, coordination with other projects, and publication can be found here.
