The Influence of Recurrent Modes of Climate Variability on the Occurrence of Winter and Summer Extreme Temperatures over North AmericaSource: Journal of Climate:;2013:;volume( 027 ):;issue: 004::page 1600DOI: 10.1175/JCLI-D-13-00068.1Publisher: American Meteorological Society
Abstract: he influence of the Pacific?North American (PNA) pattern, the northern annular mode (NAM), and the El Niño?Southern Oscillation (ENSO) on extreme temperature days and months over North America is examined. Associations between extreme temperature days and months are strongest with the PNA and NAM and weaker for ENSO. In general, the association with extremes tends to be stronger on monthly than daily time scales and for winter as compared to summer. Extreme temperatures are associated with the PNA and NAM in the vicinity of the centers of action of these circulation patterns; however, many extremes also occur on days when the amplitude and polarity of these patterns do not favor their occurrence. In winter, synoptic-scale, transient weather disturbances are important drivers of extreme temperature days; however, many of these smaller-scale events are concurrent with amplified PNA or NAM patterns. Associations are weaker in summer when other physical mechanisms affecting the surface energy balance, such as anomalous soil moisture content, also influence the occurrence of extreme temperatures.
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contributor author | Loikith, Paul C. | |
contributor author | Broccoli, Anthony J. | |
date accessioned | 2017-06-09T17:08:13Z | |
date available | 2017-06-09T17:08:13Z | |
date copyright | 2014/02/01 | |
date issued | 2013 | |
identifier issn | 0894-8755 | |
identifier other | ams-79948.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4222784 | |
description abstract | he influence of the Pacific?North American (PNA) pattern, the northern annular mode (NAM), and the El Niño?Southern Oscillation (ENSO) on extreme temperature days and months over North America is examined. Associations between extreme temperature days and months are strongest with the PNA and NAM and weaker for ENSO. In general, the association with extremes tends to be stronger on monthly than daily time scales and for winter as compared to summer. Extreme temperatures are associated with the PNA and NAM in the vicinity of the centers of action of these circulation patterns; however, many extremes also occur on days when the amplitude and polarity of these patterns do not favor their occurrence. In winter, synoptic-scale, transient weather disturbances are important drivers of extreme temperature days; however, many of these smaller-scale events are concurrent with amplified PNA or NAM patterns. Associations are weaker in summer when other physical mechanisms affecting the surface energy balance, such as anomalous soil moisture content, also influence the occurrence of extreme temperatures. | |
publisher | American Meteorological Society | |
title | The Influence of Recurrent Modes of Climate Variability on the Occurrence of Winter and Summer Extreme Temperatures over North America | |
type | Journal Paper | |
journal volume | 27 | |
journal issue | 4 | |
journal title | Journal of Climate | |
identifier doi | 10.1175/JCLI-D-13-00068.1 | |
journal fristpage | 1600 | |
journal lastpage | 1618 | |
tree | Journal of Climate:;2013:;volume( 027 ):;issue: 004 | |
contenttype | Fulltext |