2021-03-18 All-Hands Presentation Meeting Notes

Owned by Luke Van Roekel
Last updated: Apr 05, 2023 by Renata McCoy
2 min read

Presenter: jacob.shpund

Title:  Evaluation of the Predicted Particles Properties (P3) microphysical scheme in E3SMv2

Abstract: 

The Predicted Particle Properties (P3) bulk microphysics scheme (Morrison and Milbrandt, 2015) represents a significant advance from traditional bulk schemes where ice-phase particles are artificially partitioned into several different predefined categories with fixed properties. The scheme prognoses 4 bulk ice-phase variables (number and mass concentration, rimed-mass, and rimed-volume) which allow continuous ice particle evolution to be simulated through the full range of growth processes - from initial nucleation as ice crystals, followed by depositional growth, aggregation, and riming (dry/wet growth). A particular benefit in P3 is the inclusion of rimed particles (graupel/hail) that are important cloud microphysical components in mixed and deep convective clouds, but are not included in the MG2 cloud microphysics scheme (Gettelman and Morrison, 2015) used in E3SMv2.

In this work, we implemented a single-category P3 microphysical scheme in an E3SMv2 release candidate. Multi-year simulations with P3 and MG2 at 1-degree resolution are compared. The model results are evaluated by using various observable climatological products (e.g. cloud radiative forcing and precipitation), as well as cloud-related products (e.g. ice and liquid water path and cloud fraction) using cloud and satellite simulators.

Overall, the P3 microphysics shows a comparable climatology to MG2. P3 improves both the cloud shortwave and longwave radiative forcing in the Northern Hemisphere and the high cloud fraction in the Tropics. The ice water path is increased with P3 compared with MG2, and the frequency of heavy precipitation rates over the continental US is larger with P3 and more consistent with observations.  There are specific areas needed further improvements such as relatively low liquid water content at midlatitudes, and low-cloud fractions over the Southern Hemisphere.

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  • ET: 11:30 am

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Attendees


Presentation

Time
Title
Presenter
Presentation
Recording
Notes

30 min


Evaluation of the Predicted Particles Properties (P3) microphysical scheme in E3SMv2

jacob.shpund

E3SMv2_P3v4_vs_MG2_NGD_seminar.pdf