TY - JOUR
T1 - The medieval climate anomaly in Europe
T2 - Comparison of the summer and annual mean signals in two reconstructions and in simulations with data assimilation
AU - Goosse, Hugues
AU - Guiot, Joel
AU - Mann, Michael E.
AU - Dubinkina, Svetlana
AU - Sallaz-Damaz, Yoann
PY - 2012/3/1
Y1 - 2012/3/1
N2 - The spatial pattern and potential dynamical origin of the Medieval Climate Anomaly (MCA, around 1000. AD) in Europe are assessed with two recent reconstructions and simulations constrained to follow those reconstructions by means of paleoclimate data assimilation. The simulations employ a climate model of intermediate complexity (LOVECLIM). The data assimilation technique is based on a particle filter using an ensemble of 96 simulations. The peak winter (and annual mean) warming during the MCA, in our analyses, is found to be strongest at high latitudes, associated with strengthened mid-latitude westerlies. Summer warmth, by contrast, is found to be greatest in southern Europe and the Mediterranean Sea, associated with reduced westerlies and strengthened southerly winds off North Africa. The results of our analysis thus underscore the complexity of the spatial and seasonal structure of the MCA in Europe.
AB - The spatial pattern and potential dynamical origin of the Medieval Climate Anomaly (MCA, around 1000. AD) in Europe are assessed with two recent reconstructions and simulations constrained to follow those reconstructions by means of paleoclimate data assimilation. The simulations employ a climate model of intermediate complexity (LOVECLIM). The data assimilation technique is based on a particle filter using an ensemble of 96 simulations. The peak winter (and annual mean) warming during the MCA, in our analyses, is found to be strongest at high latitudes, associated with strengthened mid-latitude westerlies. Summer warmth, by contrast, is found to be greatest in southern Europe and the Mediterranean Sea, associated with reduced westerlies and strengthened southerly winds off North Africa. The results of our analysis thus underscore the complexity of the spatial and seasonal structure of the MCA in Europe.
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U2 - 10.1016/j.gloplacha.2011.07.002
DO - 10.1016/j.gloplacha.2011.07.002
M3 - Article
AN - SCOPUS:84856710884
VL - 84-85
SP - 35
EP - 47
JO - Global and Planetary Change
JF - Global and Planetary Change
SN - 0921-8181
ER -