CESM2 Initialized 2019/20 Australian Wildfire Simulations

The coupled climate response to biomass burning emissions from the 2019/20 Australian wildfire season is estimated from the contrast between this 30-member ensembles using CESM2 initialized in August 2019. In response to the fires, a widespread increase in biomass aerosol burdens is simulated in the southern hemisphere through late 2019 and early 2020. Accompanying the increase is an enhancement of cloud albedo, particularly in regions of widespread stratocumulus clouds in the southeastern subtropical Pacific Ocean. The increase in albedo acts to cool the surface, dry the boundary layer, and reduce the moist static energy of the advected low-level flow into the deep tropics. It also cools the ocean locally and the currents that flow into the deep tropics. In response, the Intertropical Convergence Zone is found to migrate northward and sea surface temperature in the Niño3.4 region cools. A subsequent multi-year ensemble-mean cooling of the tropical Pacific is simulated through the end of 2021, suggesting an important contribution to the ongoing strong La Niña event.

DOI

https://doi.org/10.5065/w4v3-kr46

Temporal Range

2019-08 to 2022-07

Spatial Resolution

1.25 degreesLongitude
0.94 degreesLatitude

Related Links

CESM2 COVID and 2019/20 Australian Wildfire Simulations

GCMD Science Keywords

• Atmosphere > Air Quality > Emissions
• Atmosphere > Atmospheric Radiation > Albedo
• Climate Indicators > Atmospheric/Ocean Indicators > Teleconnections > El Nino Southern Oscillation (Enso)
• Human Dimensions > Natural Hazards > Wildfires
• Models > Coupled Climate Models

GCMD Platform Types

• Other > Models > Cesm > Ncar Community Earth System Model

File Media Types

• application/x-hdf
• application/x-netcdf

Support Contact

John Fasullo
UCAR/NCAR - Climate and Global Dynamics Laboratory
fasullo@ucar.edu

Data Curator

GDEX Curator
UCAR/NCAR - GDEX
gdex@ucar.edu

Credit

This work was supported by NASA Awards 80NSSC17K0565 and 80NSSC22K0046, and by the Regional and Global Model Analysis (RGMA) component of the Earth and Environmental System Modeling Program of the U.S. Department of Energy's Office of Biological & Environmental Research (BER) via National Science Foundation IA 1947282.

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