Title: Significant Effective Radiative Forcing of Stratospheric Wildfire Smoke

Journal Article · · Geophysical Research Letters
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [2];  [4]; ORCiD logo [5]
  1. School of Earth and Space Sciences University of Science and Technology of China Hefei China
  2. Chemical Science Laboratory National Oceanic and Atmospheric Administration Boulder CO USA
  3. School of Earth and Space Sciences University of Science and Technology of China Hefei China, Now at Research Division California Air Resources Board Sacramento CA USA
  4. College of Atmospheric Sciences Lanzhou University Lanzhou China
  5. Institute for Environmental and Climate Research Jinan University Guangzhou China

Abstract The radiative forcing (RF) of volcanic sulfate is well quantified. However, the RF of pyrocumulonimbus (pyroCb) smoke with absorbing carbonaceous aerosols has not been considered in climate assessment reports. With the Community Earth System Model, we studied two record‐breaking wildfire events, the 2017 Pacific Northwest Event (PNE) and the 2019–2020 Australian New Year event (ANY), that perturbed stratospheric chemistry and the earth's radiation budget. We calculated a global annual‐mean effective RF (ERF) of −0.04 ± 0.02 and −0.17 ± 0.02 W/m 2 at the top of the atmosphere (TOA) for PNE and ANY, respectively. The complexity of longwave RF led to an uncertainty of about 50% in the ERF at the TOA among climate models. We found that modeled ERF from wildfire smoke was 70%–270% more negative than the ERF of mass‐equivalent sulfate aerosol, highlighting its important role in the climate radiative budget.

Sponsoring Organization:
USDOE
OSTI ID:
1886732
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 17 Vol. 49; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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