Environmental & Climate Sciences Department Seminar

"Recent developments of deep convection parameterization in E3SM"

Presented by Dr. Xiaoliang Song, UC San Diego

Thursday, May 25, 2023, 11:00 am — Videoconference / Virtual Event (see link below)

The representation of convection in global climate models is one of the most challenging scientific issues in climate modeling. Many deficiencies in precipitation and climate variability simulations and uncertainties in climate change projections can be traced to the poor representation of convection. Two major recent enhancements of Zhang and McFarlane (ZM, 1995) convection parameterization scheme for the version 3 of E3SM:convective mass flux adjustment and convective microphysics parameterization, will be discussed in this presentation. Recent observational studies suggest that the large-scale dynamical forcing (vertical motion) plays important roles in deep convection development. We developed a convective mass flux adjustment approach to represent the dynamical effects of large-scale vertical motion on convection. The coupling of convection with large-scale circulation significantly improves the simulation of climate variability in E3SM across multiple scales from the diurnal cycle, convectively coupled equatorial waves, to the Madden-Julian Oscillation (MJO). Microphysical processes in convective clouds play important roles in aerosol, cloud, circulation, and climate interaction, which can greatly affect cloud precipitation efficiency, latent heating, cloud radiative properties, and thus climate. We developed a two-moment (mass and number concentration), five-class (liquid, ice, rain, snow, and graupel) convective microphysics parameterization and implemented it in the ZM convection scheme in E3SM. This scheme is linked to aerosols through cloud droplet activation and ice nucleation processes, and to stratiform cloud parameterization through convective detrainment of cloud liquid/ice water content and droplet/crystal number concentration, which improves the representation of interactions between aerosols, convective, and stratiform clouds in E3SM. The convective microphysics parameterization also improves the simulation of tropical variability in E3SM.

Hosted by: Wuyin Lin

Videoconference Instructions

Meeting ID: 161 908 1542 Passcode: 736270 One tap mobile +16692545252,,1619081542#,,,,*736270# US (San Jose) +16468287666,,1619081542#,,,,*736270# US (New York) Dial by your location +1 669 254 5252 US (San Jose) +1 646 828 7666 US (New York) +1 646 964 1167 US (US Spanish Line) +1 669 216 1590 US (San Jose) +1 415 449 4000 US (US Spanish Line) +1 551 285 1373 US Meeting ID: 161 908 1542 Passcode: 736270 Find your local number: https://bnl.zoomgov.com/u/aApnOs00O Join by SIP 1619081542@sip.zoomgov.com Join by H.323 (US West) (US East) Meeting ID: 161 908 1542 Passcode: 736270

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