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Title: A consistent prescription of stratospheric aerosol for both radiation and chemistry in the Community Earth System Model (CESM1)

Abstract

Here we describe an updated parameterization for prescribing stratospheric aerosol in the National Center for Atmospheric Research (NCAR) Community Earth System Model (CESM1). The need for a new parameterization is motivated by the poor response of the CESM1 (formerly referred to as the Community Climate System Model, version 4, CCSM4) simulations contributed to the Coupled Model Intercomparison Project 5 (CMIP5) to colossal volcanic perturbations to the stratospheric aerosol layer (such as the 1991 Pinatubo eruption or the 1883 Krakatau eruption) in comparison to observations. In particular, the scheme used in the CMIP5 simulations by CESM1 simulated a global mean surface temperature decrease that was inconsistent with the GISS Surface Temperature Analysis (GISTEMP), NOAA's National Climatic Data Center, and the Hadley Centre of the UK Met Office (HADCRUT4). The new parameterization takes advantage of recent improvements in historical stratospheric aerosol databases to allow for variations in both the mass loading and size of the prescribed aerosol. An ensemble of simulations utilizing the old and new schemes shows CESM1's improved response to the 1991 Pinatubo eruption. Most significantly, the new scheme more accurately simulates the temperature response of the stratosphere due to local aerosol heating. Here, results also indicate that the new scheme decreasesmore » the global mean temperature response to the 1991 Pinatubo eruption by half of the observed temperature change, and modelled climate variability precludes statements as to the significance of this change.« less

Authors:
 [1];  [2];  [2];  [2]
  1. Univ. of Leeds, Leeds (United Kingdom); National Center for Atmospheric Research, Boulder, CO (United States)
  2. National Center for Atmospheric Research, Boulder, CO (United States)
Publication Date:
Research Org.:
USDOE Office of Science (SC) (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1375719
Resource Type:
Accepted Manuscript
Journal Name:
Geoscientific Model Development (Online)
Additional Journal Information:
Journal Name: Geoscientific Model Development (Online); Journal Volume: 9; Journal Issue: 7; Journal ID: ISSN 1991-9603
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Neely, III, Ryan Reynolds, Conley, Andrew J., Vitt, Francis, and Lamarque, Jean -Francois. A consistent prescription of stratospheric aerosol for both radiation and chemistry in the Community Earth System Model (CESM1). United States: N. p., 2016. Web. doi:10.5194/gmd-9-2459-2016.
Neely, III, Ryan Reynolds, Conley, Andrew J., Vitt, Francis, & Lamarque, Jean -Francois. A consistent prescription of stratospheric aerosol for both radiation and chemistry in the Community Earth System Model (CESM1). United States. doi:10.5194/gmd-9-2459-2016.
Neely, III, Ryan Reynolds, Conley, Andrew J., Vitt, Francis, and Lamarque, Jean -Francois. Mon . "A consistent prescription of stratospheric aerosol for both radiation and chemistry in the Community Earth System Model (CESM1)". United States. doi:10.5194/gmd-9-2459-2016. https://www.osti.gov/servlets/purl/1375719.
@article{osti_1375719,
title = {A consistent prescription of stratospheric aerosol for both radiation and chemistry in the Community Earth System Model (CESM1)},
author = {Neely, III, Ryan Reynolds and Conley, Andrew J. and Vitt, Francis and Lamarque, Jean -Francois},
abstractNote = {Here we describe an updated parameterization for prescribing stratospheric aerosol in the National Center for Atmospheric Research (NCAR) Community Earth System Model (CESM1). The need for a new parameterization is motivated by the poor response of the CESM1 (formerly referred to as the Community Climate System Model, version 4, CCSM4) simulations contributed to the Coupled Model Intercomparison Project 5 (CMIP5) to colossal volcanic perturbations to the stratospheric aerosol layer (such as the 1991 Pinatubo eruption or the 1883 Krakatau eruption) in comparison to observations. In particular, the scheme used in the CMIP5 simulations by CESM1 simulated a global mean surface temperature decrease that was inconsistent with the GISS Surface Temperature Analysis (GISTEMP), NOAA's National Climatic Data Center, and the Hadley Centre of the UK Met Office (HADCRUT4). The new parameterization takes advantage of recent improvements in historical stratospheric aerosol databases to allow for variations in both the mass loading and size of the prescribed aerosol. An ensemble of simulations utilizing the old and new schemes shows CESM1's improved response to the 1991 Pinatubo eruption. Most significantly, the new scheme more accurately simulates the temperature response of the stratosphere due to local aerosol heating. Here, results also indicate that the new scheme decreases the global mean temperature response to the 1991 Pinatubo eruption by half of the observed temperature change, and modelled climate variability precludes statements as to the significance of this change.},
doi = {10.5194/gmd-9-2459-2016},
journal = {Geoscientific Model Development (Online)},
number = 7,
volume = 9,
place = {United States},
year = {2016},
month = {7}
}

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