Evolution ofseasonaltemperaturedisturbancesandsolarforcingintheUS North Pacific

Vincent Courtillot (1) , Jean-Louis Le Mouël (1) , E. Blanter (2) , M. Shirman

1 IPGP - Institut de Physique du Globe de Paris
2 International Institute of Earthquake Prediction Theory and Mathematical Geophysics

We analyzethelong-termevolutionofseasonaltemperaturedisturbancesina2.52.51 area oftheUS North Pacific.LateFallandearlyWinterdisplaysignificantcorrelationoftemperaturedisturbancesand are investigatedindetail.Thelong-termevolutionoftheFalltemperaturedisturbancesfrom1945to 2008 closelyfollowsthatofsolaractivity.Therobustnessoftheseresultsissuccessfullycontrolledina 2.52.51 area immediatelynorthofthestudiedregion.Themodulationoftemperaturedisturbancesis very large(30%) comparedtothecorrespondingchangesinsolarirradiance,andhassignificant variability,evenatsmallgeographicalscale.Thephysicalmechanismofsolarforcingoftemperature disturbancesremainstobeunderstood,butarelationwithcloudinessandinfluenceoftheMadden– Julian oscillationintheNorthPacificissuggested.

Mots clés: Temperature disturbances Solar forcing North-West Pacific Solar irradiance

Domaines: Climatologie; Milieux et Changements globaux

Vincent Courtillot, Jean-Louis Le Mouël, E. Blanter, M. Shirman. Evolution ofseasonaltemperaturedisturbancesandsolarforcingintheUS North Pacific. Journal of Atmospheric and Solar-Terrestrial Physics, 2010, 72 (1), pp.83-89. ⟨10.1016/j.jastp.2009.10.011⟩. ⟨hal-00553949⟩