MEASUREMENTS OF SOLAR RADIATION AT MADISON, WIS., WITH THE CALLENDAR PYRHELIOMETER

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  • 1 Weather Bureau Office, Madison, Wis
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Abstract

SYNOPSIS

Results of observations extending over nine years are summarized, and data of related phenomena of duration of bright sunshine and of cloudiness are given. A midsummer depression in the annual march of midday normal intensity is ascribed to a maximum of haze at that time, due in turn to the increased evaporation of water and stronger convection. Spring and autumn depressions in the annual march of sun and sky radiation upon a horizontal surface are explained are arising from the double maximum in the annual march of frequency of “Colorado lows.” The suggestion is offered that this double maximum is produced by the most efficient cooperation at intermediate seasons of the stationary barometric depression in Northern Mexico and the eastward drift of the atmosphere, the annual oscillations of which are in opposite phases.

Abstract

SYNOPSIS

Results of observations extending over nine years are summarized, and data of related phenomena of duration of bright sunshine and of cloudiness are given. A midsummer depression in the annual march of midday normal intensity is ascribed to a maximum of haze at that time, due in turn to the increased evaporation of water and stronger convection. Spring and autumn depressions in the annual march of sun and sky radiation upon a horizontal surface are explained are arising from the double maximum in the annual march of frequency of “Colorado lows.” The suggestion is offered that this double maximum is produced by the most efficient cooperation at intermediate seasons of the stationary barometric depression in Northern Mexico and the eastward drift of the atmosphere, the annual oscillations of which are in opposite phases.

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