Linear additivity of climate response for combined albedo and greenhouse perturbations

V. Ramaswamy, C. T. Chen

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Using an atmospheric general circulation model with fixed cloud amounts and microphysical properties, and coupled to a mixed-layer static ocean, we perform idealized experiments to inquire into the linear characteristics of the modeled climate system's mean response to simultaneous greenhouse and Northern Hemisphere midlatitude albedo perturbations, two forcings deemed to be important during the present times. The two forcings are chosen to be equal and opposite in the global, annual-mean such that a linear behavior would be expected to lead to a complete offset of the global, annual-mean surface temperature change, which is indeed obtained. The monthly and annual zonal-mean surface temperature, and the annual zonal-mean precipitation responses to the combined forcings, also are reasonably similar to the sum of the responses to the individual forcings. The albedo forcing case casts a distinct signature on the circulation and precipitation changes in the northern and southern equatorial regions, which is absent for the greenhouse forcing case. The combined simulation yields a result similar to that for the albedo forcing case, one that is consistent with linear additive expectations.

Original languageEnglish
Pages (from-to)567-570
Number of pages4
JournalGeophysical Research Letters
Volume24
Issue number5
DOIs
Publication statusPublished - 1997 Jan 1

Fingerprint

greenhouses
albedo
climate
perturbation
surface temperature
atmospheric general circulation model
mixed layer
Atmospheric General Circulation Models
Northern Hemisphere
equatorial regions
temperate regions
hemispheres
ocean
casts
oceans
simulation
signatures
experiment

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Linear additivity of climate response for combined albedo and greenhouse perturbations. / Ramaswamy, V.; Chen, C. T.

In: Geophysical Research Letters, Vol. 24, No. 5, 01.01.1997, p. 567-570.

Research output: Contribution to journalArticle

@article{19afb1edc54c44dfaaa10e589a793ee0,
title = "Linear additivity of climate response for combined albedo and greenhouse perturbations",
abstract = "Using an atmospheric general circulation model with fixed cloud amounts and microphysical properties, and coupled to a mixed-layer static ocean, we perform idealized experiments to inquire into the linear characteristics of the modeled climate system's mean response to simultaneous greenhouse and Northern Hemisphere midlatitude albedo perturbations, two forcings deemed to be important during the present times. The two forcings are chosen to be equal and opposite in the global, annual-mean such that a linear behavior would be expected to lead to a complete offset of the global, annual-mean surface temperature change, which is indeed obtained. The monthly and annual zonal-mean surface temperature, and the annual zonal-mean precipitation responses to the combined forcings, also are reasonably similar to the sum of the responses to the individual forcings. The albedo forcing case casts a distinct signature on the circulation and precipitation changes in the northern and southern equatorial regions, which is absent for the greenhouse forcing case. The combined simulation yields a result similar to that for the albedo forcing case, one that is consistent with linear additive expectations.",
author = "V. Ramaswamy and Chen, {C. T.}",
year = "1997",
month = "1",
day = "1",
doi = "10.1029/97GL00248",
language = "English",
volume = "24",
pages = "567--570",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "5",

}

TY - JOUR

T1 - Linear additivity of climate response for combined albedo and greenhouse perturbations

AU - Ramaswamy, V.

AU - Chen, C. T.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - Using an atmospheric general circulation model with fixed cloud amounts and microphysical properties, and coupled to a mixed-layer static ocean, we perform idealized experiments to inquire into the linear characteristics of the modeled climate system's mean response to simultaneous greenhouse and Northern Hemisphere midlatitude albedo perturbations, two forcings deemed to be important during the present times. The two forcings are chosen to be equal and opposite in the global, annual-mean such that a linear behavior would be expected to lead to a complete offset of the global, annual-mean surface temperature change, which is indeed obtained. The monthly and annual zonal-mean surface temperature, and the annual zonal-mean precipitation responses to the combined forcings, also are reasonably similar to the sum of the responses to the individual forcings. The albedo forcing case casts a distinct signature on the circulation and precipitation changes in the northern and southern equatorial regions, which is absent for the greenhouse forcing case. The combined simulation yields a result similar to that for the albedo forcing case, one that is consistent with linear additive expectations.

AB - Using an atmospheric general circulation model with fixed cloud amounts and microphysical properties, and coupled to a mixed-layer static ocean, we perform idealized experiments to inquire into the linear characteristics of the modeled climate system's mean response to simultaneous greenhouse and Northern Hemisphere midlatitude albedo perturbations, two forcings deemed to be important during the present times. The two forcings are chosen to be equal and opposite in the global, annual-mean such that a linear behavior would be expected to lead to a complete offset of the global, annual-mean surface temperature change, which is indeed obtained. The monthly and annual zonal-mean surface temperature, and the annual zonal-mean precipitation responses to the combined forcings, also are reasonably similar to the sum of the responses to the individual forcings. The albedo forcing case casts a distinct signature on the circulation and precipitation changes in the northern and southern equatorial regions, which is absent for the greenhouse forcing case. The combined simulation yields a result similar to that for the albedo forcing case, one that is consistent with linear additive expectations.

UR - http://www.scopus.com/inward/record.url?scp=0031091482&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031091482&partnerID=8YFLogxK

U2 - 10.1029/97GL00248

DO - 10.1029/97GL00248

M3 - Article

AN - SCOPUS:0031091482

VL - 24

SP - 567

EP - 570

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 5

ER -