Climate Response to Spectral Solar Forcing from GISS GCMAM
Abstract
Solar variations impose a unique external forcing to Earth's climate. Recent observations from Spectral Irradiance Monitor (SIM) on Solar Radiation and Climate Experiment (SORCE) indicate different spectral irradiance variations, both amplitude and phase, from previously models. The current version of Goddard Institute for Space Studies (GISS) Global Climate Middle Atmosphere Model (GCMAM) couples atmosphere with ocean, and has interactive atmospheric chemistry with a model top near the mesopause, allowing us to examine the full climate response to spectral solar forcing. We use the GCMAM to examine the climate response to two types of spectral solar forcing, with one from reconstruction and the other based on SORCE observations. We show different ozone and temperature responses to the two solar forcing scenarios on decadal time scale (i.e., solar minimum minus solar maximum) and long- term trends on centennial time scales. We further discuss mechanisms for Sun Climate connection.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2012
- Bibcode:
- 2012AGUFMGC23C1103W
- Keywords:
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- 1616 GLOBAL CHANGE / Climate variability;
- 1650 GLOBAL CHANGE / Solar variability