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Comments on “The Semidirect Aerosol Effect: Comparison of a Single-Column Model with Large Eddy Simulation for Marine Stratocumulus’’

Comments on “The Semidirect Aerosol Effect: Comparison of a Single-Column Model with Large Eddy... Johnson (2005) compared single-column model “semidirect’’ radiative forcing results from a large-eddy simulation (LES) model with those from the National Center for Atmospheric Research (NCAR) single-column community climate model (SCCM) and found that the SCCM gave positive forcings a factor of 5 smaller than those of the LES. I do not disagree with this general result. However, in the article, Johnson cited three commentaries that criticized results from Jacobson (2002) for various reasons, yet he did not cite or discuss the responses to these commentaries, thereby leaving readers with a misleading impression that the criticisms were either correct or unanswered. In my opinion, when a commentary is cited to criticize someone else’s work, the response to the commentary should also be cited. The citations for the responses to the commentaries omitted by Johnson (2005) are provided herein ( Jacobson 2003a , b , c ). Furthermore, Johnson (2005) concluded that “global studies into the influence of absorbing aerosols on clouds [citations omitted] have necessarily relied on numerically efficient models where the vertical resolution is restricted and cloud parameterizations are just as simple as in the SCMM.’’ Whereas this statement appears true for the studies cited, it is largely http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Climate American Meteorological Society

Comments on “The Semidirect Aerosol Effect: Comparison of a Single-Column Model with Large Eddy Simulation for Marine Stratocumulus’’

Journal of Climate , Volume 19 (1) – Feb 8, 2005

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Publisher
American Meteorological Society
Copyright
Copyright © 2005 American Meteorological Society
ISSN
1520-0442
DOI
10.1175/JCLI3639.1
Publisher site
See Article on Publisher Site

Abstract

Johnson (2005) compared single-column model “semidirect’’ radiative forcing results from a large-eddy simulation (LES) model with those from the National Center for Atmospheric Research (NCAR) single-column community climate model (SCCM) and found that the SCCM gave positive forcings a factor of 5 smaller than those of the LES. I do not disagree with this general result. However, in the article, Johnson cited three commentaries that criticized results from Jacobson (2002) for various reasons, yet he did not cite or discuss the responses to these commentaries, thereby leaving readers with a misleading impression that the criticisms were either correct or unanswered. In my opinion, when a commentary is cited to criticize someone else’s work, the response to the commentary should also be cited. The citations for the responses to the commentaries omitted by Johnson (2005) are provided herein ( Jacobson 2003a , b , c ). Furthermore, Johnson (2005) concluded that “global studies into the influence of absorbing aerosols on clouds [citations omitted] have necessarily relied on numerically efficient models where the vertical resolution is restricted and cloud parameterizations are just as simple as in the SCMM.’’ Whereas this statement appears true for the studies cited, it is largely

Journal

Journal of ClimateAmerican Meteorological Society

Published: Feb 8, 2005

References