The North American Monsoon (NAM) provides the majority of rainfall for central and northern Mexico as well as parts of the south west USA. The controls over the strength of the NAM in a given year are complex, and include both Pacific and Atlantic systems. We present here an annually resolved proxy reconstruction of NAM rainfall variability over the last ~6 ka, from an inwash record from the Laguna de Juanacatlan, Mexico. This high resolution, exceptionally well dated record allows changes in the NAM through the latter half of the Holocene to be investigated in both time and space domains, improving our understanding of the controls on the system. Our analysis shows a shift in conditions between c. 4 and 3 ka BP, after which clear ENSO/PDO type forcing patterns are evident.
|Number of pages||6|
|Journal||Quaternary Science Reviews|
|Early online date||17 Jul 2015|
|Publication status||Published - 15 Sept 2015|
- North American Monsoon
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- Faculty of Earth and Life Sciences, Department of Geography and Earth Sciences - Professor, Head of Department (Geography)
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