Radiation windows as indicators of an astronomical influence on the Devil's Hole chronology

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Abstract
Orbitalexplanationsofpaleoclimaticrecordstraditionallyfocusondailyinsolationat ;60&N. We exemplify how insolation at different latitudes and different times of day can explain the timing of the Devil's Hole d18O record. We combine winter tropical noontime insolation (associated with the source-region for wintertime precipitation) and summer extra-tropicalnoontimeinsolation(producingnoontimeheattowarmterrestrialsurfaces). Periodsoflowwinterandhighsummerinsolationarecalled"radiationwindows"andyield drier-warmer conditions in the Northern Hemisphere mid-latitudes. When radiation win- dows are compared with the DH-11 record, the apparent contradiction with Milankovitch (Winogradetal.,1992)mayberesolved.Themiddle-latitudecontinentalclimatesignal,as recordedbyDH-11,tendstowardacoolingstateuntilinterruptedbyatermination.Inevery instance where the DH-11 record is warming before a radiation window, a termination occurs. If radiation windows occur with antecedent cooling, then there is a complex re- sponse of warming with a variable lag effect. Yet, there are no cases where cooling follows a radiation window.

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