George A. Brook

TL;DR: In this paper, an improved soil PCO2-AET model was developed by assuming that as AET approaches zero, soilPCO2 approaches the atmospheric value and that there is an upper limit to soil PCOPO2 at very high AET.

TL;DR: In this article, a carbonate stalagmite from Drotsky's Cave in northwestern Botswana consists of alternating layers of calcite and aragonite and radiocarbon ages indicate that the calcite-aragonite pairs are annual layers representing about 1500 years of deposition.

TL;DR: The stalagmite record as discussed by the authors provides a 3300-year record of droughts that impacted the Maya civilization at least four times across a span of 1500 years, and the most sustained period of drought coincided with the collapse of Classic Maya civilization.

TL;DR: In this article, Principal Component Analysis (PCA) plots are presented graphically as indicators of climate variability for the region and the results cover different biomes that include the summer-rain region in the north and east, the winter-rain area in the south and the dry zone in the west.

TL;DR: This article investigated the late Quaternary wetting and drying of the Tsodilo Hills, in the northwestern Kalahari desert, from evidence at a single site, and concluded that careful consideration of multi-proxy data from a single location can assist in resolving discrepancies that arise from independent studies of lake, cave and dune records.