Does human activity widen the tropics?

Details Does human activity widen the tropics? Does human activity widen the tropics?

2008-03-13

arxiv.org/abs/0803.1959v1

Physics

Space Physics

2 pages, 1 figure

Scientific paper

The progress article - Widening of the tropical belt in a changing climate - by Seidel et al. (2008) published in the first issue of Nature Geosciences, summarizes the results of several methods to determine the width of the tropical zone. All they show evidence that the tropics have been expanding over the past few decades. We confirm this widening based on one more indicator - the position of the subtropical centers of high pressure. However, we question the implication of the authors that the tropics widen in response to human activity, and suggest as a more probable cause the increasing solar activity. Consequently, we question their conclusion that this widening may continue into the future in association with anthropogenic climate change, and suggest that whether the tropics will continue widening will depend on the future evolution of solar activity rather than on anthropogenic activity.

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