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3728 VOLUME 13J O U R N A L O F C L I M A T E 2000 American Meteorological Society
 

Summary: 3728 VOLUME 13J O U R N A L O F C L I M A T E
2000 American Meteorological Society
Anthropogenic Forcing and Decadal Climate Variability in Sensitivity Experiments of
Twentieth- and Twenty-First-Century Climate
GERALD A. MEEHL, WARREN M. WASHINGTON, JULIE M. ARBLASTER, THOMAS W. BETTGE,
AND WARREN G. STRAND JR.
National Center for Atmospheric Research,* Boulder, Colorado
(Manuscript received 15 June 1998, in final form 26 January 2000)
ABSTRACT
A methodology is formulated to evaluate the possible changes in decadal-timescale (1020-yr period) surface
temperature variability and associated low-frequency fluctuations of anthropogenic forcing and changes in climate
base state due to the forcing in simulations of twentieth- and twenty-first-century climate in a global coupled
climate model without flux adjustment. The two climate change experiments both start in the year 1900. The
first uses greenhouse gas radiative forcing (represented by equivalent CO2) observed during the twentieth century,
and extends greenhouse gas forcing to the year 2035 by increasing CO2 1% yr 1
compound after 1990 (CO2-
only experiment). The second includes the same greenhouse gas forcing as the first, but adds the effects of time-
varying geographic distributions of monthly sulfate aerosol radiative forcing represented by a change in surface
albedo (CO2 sulfates experiment). The climate change experiments are compared with a 135-yr control
experiment with no change in external forcing. Climate system responses in the CO2-only and CO2 sulfates

  

Source: Arblaster, Julie - Bureau of Meteorology, Australia
Meehl, Gerald A. - Climate and Global Dynamics Division, National Center for Atmospheric Research

 

Collections: Geosciences