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Stratospheric sulfate aerosol geoengineering could alter the high-latitude seasonal cycle

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2019GL085758· OSTI ID:1608576
 [1];  [1];  [2];  [3];  [4];  [2];  [2];  [5];  [6];  [6]
  1. Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzho
  2. Cornell University
  3. National Center for Atmospheric Research
  4. BATTELLE (PACIFIC NW LAB)
  5. National Center for Atmospheric Research, PO Box 3000-80307,
  6. University Corporation for Atmospheric Research
+ Show Author Affiliations
Stratospheric aerosol geoengineering (SAG) has been proposed to reduce some impacts of anthropogenic climate change. Previous studies examined annual mean climate responses to SAG. Here we use the Stratospheric Aerosol Geoengineering Large Ensemble simulations to explore the effects of SAG on the seasonal cycle of climate change. Simulations show that relative to the present-day climate, SAG diminishes the amplitude of the seasonal cycle of temperature at many high-latitude locations, with warmer winters and cooler summers. The seasonal temperature shift signi?cantly in?uences the seasonal cycle of snow depth and sea ice, with Arctic sea ice recovery overcompensated in summer by 52% and undercompensated in winter by 8%. We identify that both the dynamic effects of aerosol-induced stratospheric heating and seasonal variations of sunlight contribute to the shifts in seasonal cycle. Shifts in the seasonal cycle have important ecological and environmental implications, which should be considered in geoengineering impact analysis.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1608576
Report Number(s):
PNNL-SA-152144
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 23 Vol. 46
Country of Publication:
United States
Language:
English

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