Show simple item record

dc.contributor.authorStevenson, Samantha  Concept link
dc.contributor.authorOverpeck, Jonathan T.  Concept link
dc.contributor.authorFasullo, John T.  Concept link
dc.contributor.authorCoats, Sloan  Concept link
dc.contributor.authorParsons, Luke A.  Concept link
dc.contributor.authorOtto-Bliesner, Bette  Concept link
dc.contributor.authorAult, Toby  Concept link
dc.contributor.authorLoope, Garrison  Concept link
dc.contributor.authorCole, Julia  Concept link
dc.date.accessioned2018-05-31T14:21:50Z
dc.date.available2018-11-03T08:30:48Z
dc.date.issued2018-05-03
dc.identifier.citationJournal of Climate 31 (2018): 4309-4327en_US
dc.identifier.urihttps://hdl.handle.net/1912/10401
dc.descriptionAuthor Posting. © American Meteorological Society, 2018. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 31 (2018): 4309-4327, doi:10.1175/JCLI-D-17-0407.1.en_US
dc.description.abstractMultidecadal hydroclimate variability has been expressed as “megadroughts” (dry periods more severe and prolonged than observed over the twentieth century) and corresponding “megapluvial” wet periods in many regions around the world. The risk of such events is strongly affected by modes of coupled atmosphere–ocean variability and by external impacts on climate. Accurately assessing the mechanisms for these interactions is difficult, since it requires large ensembles of millennial simulations as well as long proxy time series. Here, the Community Earth System Model (CESM) Last Millennium Ensemble is used to examine statistical associations among megaevents, coupled climate modes, and forcing from major volcanic eruptions. El Niño–Southern Oscillation (ENSO) strongly affects hydroclimate extremes: larger ENSO amplitude reduces megadrought risk and persistence in the southwestern United States, the Sahel, monsoon Asia, and Australia, with corresponding increases in Mexico and the Amazon. The Atlantic multidecadal oscillation (AMO) also alters megadrought risk, primarily in the Caribbean and the Amazon. Volcanic influences are felt primarily through enhancing AMO amplitude, as well as alterations in the structure of both ENSO and AMO teleconnections, which lead to differing manifestations of megadrought. These results indicate that characterizing hydroclimate variability requires an improved understanding of both volcanic climate impacts and variations in ENSO/AMO teleconnections.en_US
dc.description.sponsorshipThis work is supported by NSF EaSM Grants AGS-1243125 and NCAR-1243107 to The University of Arizona.en_US
dc.language.isoen_USen_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.urihttps://doi.org/10.1175/JCLI-D-17-0407.1
dc.subjectDroughten_US
dc.subjectClimate variabilityen_US
dc.subjectENSOen_US
dc.subjectPaleoclimateen_US
dc.subjectClimate modelsen_US
dc.subjectMultidecadal variabilityen_US
dc.titleClimate variability, volcanic forcing, and last millennium hydroclimate extremesen_US
dc.typeArticleen_US
dc.description.embargo2018-11-03en_US
dc.identifier.doi10.1175/JCLI-D-17-0407.1


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record