The Role of Forcing and Internal Dynamics in explaining the 'Medieval Climate Anomaly'
Proxy reconstructions suggest that peak global temperature during the past warm interval known as the Medieval Climate Anomaly (MCA, roughly 950-1250 AD) has been exceeded only during the most recent decades. To better understand the origin of this warm period, we use model simulations constrained b...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20140001050 2023-05-15T15:04:01+02:00 The Role of Forcing and Internal Dynamics in explaining the 'Medieval Climate Anomaly' Renssen, Hans Crespin, Elisabeth Loutre, Marie-France Mann, Michael E. Shindell, Drew Goossee, Hugues Dubinkina, Svetlana Unclassified, Unlimited, Publicly available December 2012 application/pdf http://hdl.handle.net/2060/20140001050 unknown Document ID: 20140001050 http://hdl.handle.net/2060/20140001050 Copyright, Distribution as joint owner in the copyright CASI Meteorology and Climatology GSFC-E-DAA-TN8964 Climate Dynamics; 39; 12; 2847-2866 2012 ftnasantrs 2019-07-21T00:34:36Z Proxy reconstructions suggest that peak global temperature during the past warm interval known as the Medieval Climate Anomaly (MCA, roughly 950-1250 AD) has been exceeded only during the most recent decades. To better understand the origin of this warm period, we use model simulations constrained by data assimilation establishing the spatial pattern of temperature changes that is most consistent with forcing estimates, model physics and the empirical information contained in paleoclimate proxy records. These numerical experiments demonstrate that the reconstructed spatial temperature pattern of the MCA can be explained by a simple thermodynamical response of the climate system to relatively weak changes in radiative forcing combined with a modification of the atmospheric circulation, displaying some similarities with the positive phase of the so-called Arctic Oscillation, and with northward shifts in the position of the Gulf Stream and Kuroshio currents. The mechanisms underlying the MCA are thus quite different from anthropogenic mechanisms responsible for modern global warming. Other/Unknown Material Arctic Global warming NASA Technical Reports Server (NTRS) Arctic |
institution |
Open Polar |
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NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Meteorology and Climatology |
spellingShingle |
Meteorology and Climatology Renssen, Hans Crespin, Elisabeth Loutre, Marie-France Mann, Michael E. Shindell, Drew Goossee, Hugues Dubinkina, Svetlana The Role of Forcing and Internal Dynamics in explaining the 'Medieval Climate Anomaly' |
topic_facet |
Meteorology and Climatology |
description |
Proxy reconstructions suggest that peak global temperature during the past warm interval known as the Medieval Climate Anomaly (MCA, roughly 950-1250 AD) has been exceeded only during the most recent decades. To better understand the origin of this warm period, we use model simulations constrained by data assimilation establishing the spatial pattern of temperature changes that is most consistent with forcing estimates, model physics and the empirical information contained in paleoclimate proxy records. These numerical experiments demonstrate that the reconstructed spatial temperature pattern of the MCA can be explained by a simple thermodynamical response of the climate system to relatively weak changes in radiative forcing combined with a modification of the atmospheric circulation, displaying some similarities with the positive phase of the so-called Arctic Oscillation, and with northward shifts in the position of the Gulf Stream and Kuroshio currents. The mechanisms underlying the MCA are thus quite different from anthropogenic mechanisms responsible for modern global warming. |
format |
Other/Unknown Material |
author |
Renssen, Hans Crespin, Elisabeth Loutre, Marie-France Mann, Michael E. Shindell, Drew Goossee, Hugues Dubinkina, Svetlana |
author_facet |
Renssen, Hans Crespin, Elisabeth Loutre, Marie-France Mann, Michael E. Shindell, Drew Goossee, Hugues Dubinkina, Svetlana |
author_sort |
Renssen, Hans |
title |
The Role of Forcing and Internal Dynamics in explaining the 'Medieval Climate Anomaly' |
title_short |
The Role of Forcing and Internal Dynamics in explaining the 'Medieval Climate Anomaly' |
title_full |
The Role of Forcing and Internal Dynamics in explaining the 'Medieval Climate Anomaly' |
title_fullStr |
The Role of Forcing and Internal Dynamics in explaining the 'Medieval Climate Anomaly' |
title_full_unstemmed |
The Role of Forcing and Internal Dynamics in explaining the 'Medieval Climate Anomaly' |
title_sort |
role of forcing and internal dynamics in explaining the 'medieval climate anomaly' |
publishDate |
2012 |
url |
http://hdl.handle.net/2060/20140001050 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Global warming |
genre_facet |
Arctic Global warming |
op_source |
CASI |
op_relation |
Document ID: 20140001050 http://hdl.handle.net/2060/20140001050 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766335849427894272 |