Milankovitch theory viewed from Devils Hole

Article Abstract:

Fresh-water carbonate sequence records from Devils Hole in Nevada are consistent with 18-oxygen measurements conducted in the area, which reports changes in temperature of precipitation and also changes in the composition of the moisture source. However, the records did not agree with the predictions of the Milankovitch theory. Nonetheless, spectral analysis of the record still proved that glacial-interglacial cycles were affected by orbital variations, and that conclusions made from the Devils Hole report cannot be true for marine records as well.

Analysis, Marine sediments, Glacial climates

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Exceptionally steep north-south gradients in lake temperatures during the last deglaciation

Article Abstract:

The existence of strong summer thermal gradients in North America is investigated using palaeoecological methods. These gradients are believed to have been formed by the combination of high summer insolation and the presence of the Laurentide ice sheet during the period when the last glacial climate was shifting to the present interglacial climate. Reconstructions of temperature gradients for the late-glacial period in the study region are found to be much stronger than those of the modern period.

North America, Natural history, Climatic changes, Climate change, Ice sheets, Glaciers

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