Dynamics, Variability, and Change in Seasonal Precipitation Reconstructions for North America

Authors

Bethany Coulthard, University of Nevada, Las VegasFollow
David W. Stahle, University of Arkansas
Edward R. Cook, Columbia University
Dorian J. Burnette, University of Memphis
Max C. A. Torbenson, University of Arkansas
Ian M. Howard, University of Arkansas
Daniel Griffin, University of Minnesota
Jose Villanueva Diaz, Centro Nacional de Investigacion Disciplinaria Relacion Agua-Suelo-Planta-Atmosfera
Benjamin I. Cook, NASA Goddard Institute for Space Studies
Park Williams, Columbia University
Emma Watson, Environment and Climate Change Canada
David J. Sauchyn, University of Regina
Neil Pederson, Harvard Forest
Connie A. Woodhouse, University of Arizona, Tucson
Gregory T. Pederson, U.S. Geological Survey
David Meko, University of Arizona, Tucson
Christopher J. Crawford, U.S. Geological Survey

Document Type

Article

Publication Date

4-15-2020

Publication Title

Journal of Climate

Volume

33

Issue

8

First page number:

1

Last page number:

23

Abstract

Cool- and warm-season precipitation totals have been reconstructed on a gridded basis for North America using 439 tree-ring chronologies correlated with December–April totals and 547 different chronologies correlated with May–July totals. These discrete seasonal chronologies are not significantly correlated with the alternate season; the December–April reconstructions are skillful over most of the southern and western United States and north-central Mexico, and the May–July estimates have skill over most of the United States, southwestern Canada, and northeastern Mexico. Both the strong continent-wide El Niño–Southern Oscillation (ENSO) signal embedded in the cool-season reconstructions and the Arctic Oscillation signal registered by the warm-season estimates faithfully reproduce the sign, intensity, and spatial patterns of these ocean–atmospheric influences on North American precipitation as recorded with instrumental data. The reconstructions are included in the North American Seasonal Precipitation Atlas (NASPA) and provide insight into decadal droughts and pluvials. They indicate that the sixteenth-century megadrought, the most severe and sustained North American drought of the past 500 years, was the combined result of three distinct seasonal droughts, each bearing unique spatial patterns potentially associated with seasonal forcing from ENSO, the Arctic Oscillation, and the Atlantic multidecadal oscillation. Significant 200–500-yr-long trends toward increased precipitation have been detected in the cool- and warm-season reconstructions for eastern North America. These seasonal precipitation changes appear to be part of the positive moisture trend measured in other paleoclimate proxies for the eastern area that began as a result of natural forcing before the industrial revolution and may have recently been enhanced by anthropogenic climate change.

Keywords

Arctic Oscillation; ENSO; Paleoclimate; Seasonal variability

Disciplines

Earth Sciences | Physical Sciences and Mathematics

Language

English

Repository Citation

Coulthard, B., Stahle, D. W., Cook, E. R., Burnette, D. J., Torbenson, M. C., Howard, I. M., Griffin, D., Villanueva Diaz, J., Cook, B. I., Williams, P., Watson, E., Sauchyn, D. J., Pederson, N., Woodhouse, C. A., Pederson, G. T., Meko, D., Crawford, C. J. (2020). Dynamics, Variability, and Change in Seasonal Precipitation Reconstructions for North America. Journal of Climate, 33(8), 1-23.
http://dx.doi.org/10.1175/JCLI-D-19-0270.1