Assessment of E3SMv2 simulations of Antarctica surface climate and polar-tropical teleconnections
Abstract
Changes to the Antarctic cryosphere have important implications for the global climate system. Developing necessary capability to simulate all essential aspects of the Antarctic cryopshere system is one of the core objectives of the DOEs Energy Exascale Earth System Model (E3SM) project. Robust skill in simulating the atmospheric forcings is key to the simulation of the cryosphere system and its variability across a wide range of time scales. The forcings and their variability can be locally or remotely driven. This work aims to provide an assessment of the latest E3SM simulations on simulating the atmospheric forcings over the Antarctica and the influences of polar-tropical teleconnections on the variability from seasonal to interannual and decadal time scales. The model behavior in simulating the surface climatology and the seasonality will be analyzed against available observations, with emphasis on characterizing the associated dynamical and physical processes. The relationships between the surface fields around the Antarctica, the large-scale modes of variability over the southern hemisphere, the tropical convection and SST anomalies over different tropical ocean basins will be examined to reveal the simulated polar-tropical teleconnections. Seasonal dependence of the teleconnections and the forcing characteristics associated in-phase versus out-of-phase co-variability of polar and tropical modes -- mainly the Southern Annular Mode (SAM) and the El Nino Southern Oscillation (ENSO) will also be analyzed. Understanding the discrepancies in the simulated teleconnections with respect to the observed will provide critical guidance on addressing biases in both the atmospheric and oceanic model components.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2021
- Bibcode:
- 2021AGUFM.A41D..09L