Fast Atmosphere-Ocean Model Runs with Large Changes in CO2
How does climate sensitivity vary with the magnitude of climate forcing? This question was investigated with the use of a modified coupled atmosphere-ocean model, whose stability was improved so that the model would accommodate large radiative forcings yet be fast enough to reach rapid equilibrium....
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ftnasantrs:oai:casi.ntrs.nasa.gov:20140010319 2023-05-15T18:18:22+02:00 Fast Atmosphere-Ocean Model Runs with Large Changes in CO2 Lacis, Andrew A. Colose, Christopher Russell, Gary L. Rind, David H. Opstbaum, Roger F. Unclassified, Unlimited, Publicly available November 16, 2013 application/pdf http://hdl.handle.net/2060/20140010319 unknown Document ID: 20140010319 http://hdl.handle.net/2060/20140010319 Copyright, Distribution as joint owner in the copyright CASI Meteorology and Climatology GSFC-E-DAA-TN8805 Geophysical Research Letters; 40; 21; 5787-5792 2013 ftnasantrs 2019-07-21T00:27:46Z How does climate sensitivity vary with the magnitude of climate forcing? This question was investigated with the use of a modified coupled atmosphere-ocean model, whose stability was improved so that the model would accommodate large radiative forcings yet be fast enough to reach rapid equilibrium. Experiments were performed in which atmospheric CO2 was multiplied by powers of 2, from 1/64 to 256 times the 1950 value. From 8 to 32 times, the 1950 CO2, climate sensitivity for doubling CO2 reaches 8 C due to increases in water vapor absorption and cloud top height and to reductions in low level cloud cover. As CO2 amount increases further, sensitivity drops as cloud cover and planetary albedo stabilize. No water vapor-induced runaway greenhouse caused by increased CO2 was found for the range of CO2 examined. With CO2 at or below 1/8 of the 1950 value, runaway sea ice does occur as the planet cascades to a snowball Earth climate with fully ice covered oceans and global mean surface temperatures near 30 C. Other/Unknown Material Sea ice NASA Technical Reports Server (NTRS) |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
language |
unknown |
topic |
Meteorology and Climatology |
spellingShingle |
Meteorology and Climatology Lacis, Andrew A. Colose, Christopher Russell, Gary L. Rind, David H. Opstbaum, Roger F. Fast Atmosphere-Ocean Model Runs with Large Changes in CO2 |
topic_facet |
Meteorology and Climatology |
description |
How does climate sensitivity vary with the magnitude of climate forcing? This question was investigated with the use of a modified coupled atmosphere-ocean model, whose stability was improved so that the model would accommodate large radiative forcings yet be fast enough to reach rapid equilibrium. Experiments were performed in which atmospheric CO2 was multiplied by powers of 2, from 1/64 to 256 times the 1950 value. From 8 to 32 times, the 1950 CO2, climate sensitivity for doubling CO2 reaches 8 C due to increases in water vapor absorption and cloud top height and to reductions in low level cloud cover. As CO2 amount increases further, sensitivity drops as cloud cover and planetary albedo stabilize. No water vapor-induced runaway greenhouse caused by increased CO2 was found for the range of CO2 examined. With CO2 at or below 1/8 of the 1950 value, runaway sea ice does occur as the planet cascades to a snowball Earth climate with fully ice covered oceans and global mean surface temperatures near 30 C. |
format |
Other/Unknown Material |
author |
Lacis, Andrew A. Colose, Christopher Russell, Gary L. Rind, David H. Opstbaum, Roger F. |
author_facet |
Lacis, Andrew A. Colose, Christopher Russell, Gary L. Rind, David H. Opstbaum, Roger F. |
author_sort |
Lacis, Andrew A. |
title |
Fast Atmosphere-Ocean Model Runs with Large Changes in CO2 |
title_short |
Fast Atmosphere-Ocean Model Runs with Large Changes in CO2 |
title_full |
Fast Atmosphere-Ocean Model Runs with Large Changes in CO2 |
title_fullStr |
Fast Atmosphere-Ocean Model Runs with Large Changes in CO2 |
title_full_unstemmed |
Fast Atmosphere-Ocean Model Runs with Large Changes in CO2 |
title_sort |
fast atmosphere-ocean model runs with large changes in co2 |
publishDate |
2013 |
url |
http://hdl.handle.net/2060/20140010319 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
CASI |
op_relation |
Document ID: 20140010319 http://hdl.handle.net/2060/20140010319 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766194919298301952 |