Recent trends in hemispheric temperature and growing season indices in Wisconsin

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Abstract

In Wisconsin, the growing season became cooler and shorter from 1958 into the mid-1960s. These trends accompanied a pronounced drop in the mean annual tropospheric temperature of the Northern Hemisphere. Although Northern-Hemispheric—tropospheric temperatures continued to fall (albeit at a lesser rate) from the mid-1960s through 1973, the growing season in Wisconsin showed a general trend toward lengthening and warming. In view of concern over the potential impact of climatic variation upon agriculture, these observations point out the need for a detailed examination of the modes of translation of hemispheric—tropospheric temperature trends to climatic changes at ground level, and at smaller temporal and spatial scales.

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