Northern annular mode impact on spring climate in the western United States

Stephanie A. McAfee, Joellen Russell

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

Shifts in stormtrack position associated with the Northern Annular Mode (NAM) are linked to temperature changes and reduced spring precipitation in the western United States. During the transition to spring following a high-index winter, weakening of the stormtrack over the northeastern Pacific Ocean and western United States is shown to lead to warmer and drier conditions west of the Rocky Mountains and increased precipitation just east of the Rocky Mountains, consistent with observations of early spring onset in the western United States. Given projected increases in the average annular mode index and associated poleward shifts in the stormtrack, this analysis provides additional evidence that much of the western United States will experience more severe drought conditions over the next several decades, irrespective of changes in temperature, because of an earlier shift to warm-season circulation patterns.

Original languageEnglish (US)
Article numberL17701
JournalGeophysical Research Letters
Volume35
Issue number17
DOIs
StatePublished - Sep 16 2008

Fingerprint

Arctic Oscillation
climate
Rocky Mountains (North America)
mountain
shift
temperature
drought
Pacific Ocean
winter
ocean
index
analysis

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

Cite this

Northern annular mode impact on spring climate in the western United States. / McAfee, Stephanie A.; Russell, Joellen.

In: Geophysical Research Letters, Vol. 35, No. 17, L17701, 16.09.2008.

Research output: Contribution to journalArticle

@article{28aaba4613254154997b03836dc86715,
title = "Northern annular mode impact on spring climate in the western United States",
abstract = "Shifts in stormtrack position associated with the Northern Annular Mode (NAM) are linked to temperature changes and reduced spring precipitation in the western United States. During the transition to spring following a high-index winter, weakening of the stormtrack over the northeastern Pacific Ocean and western United States is shown to lead to warmer and drier conditions west of the Rocky Mountains and increased precipitation just east of the Rocky Mountains, consistent with observations of early spring onset in the western United States. Given projected increases in the average annular mode index and associated poleward shifts in the stormtrack, this analysis provides additional evidence that much of the western United States will experience more severe drought conditions over the next several decades, irrespective of changes in temperature, because of an earlier shift to warm-season circulation patterns.",
author = "McAfee, {Stephanie A.} and Joellen Russell",
year = "2008",
month = "9",
day = "16",
doi = "10.1029/2008GL034828",
language = "English (US)",
volume = "35",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "17",

}

TY - JOUR

T1 - Northern annular mode impact on spring climate in the western United States

AU - McAfee, Stephanie A.

AU - Russell, Joellen

PY - 2008/9/16

Y1 - 2008/9/16

N2 - Shifts in stormtrack position associated with the Northern Annular Mode (NAM) are linked to temperature changes and reduced spring precipitation in the western United States. During the transition to spring following a high-index winter, weakening of the stormtrack over the northeastern Pacific Ocean and western United States is shown to lead to warmer and drier conditions west of the Rocky Mountains and increased precipitation just east of the Rocky Mountains, consistent with observations of early spring onset in the western United States. Given projected increases in the average annular mode index and associated poleward shifts in the stormtrack, this analysis provides additional evidence that much of the western United States will experience more severe drought conditions over the next several decades, irrespective of changes in temperature, because of an earlier shift to warm-season circulation patterns.

AB - Shifts in stormtrack position associated with the Northern Annular Mode (NAM) are linked to temperature changes and reduced spring precipitation in the western United States. During the transition to spring following a high-index winter, weakening of the stormtrack over the northeastern Pacific Ocean and western United States is shown to lead to warmer and drier conditions west of the Rocky Mountains and increased precipitation just east of the Rocky Mountains, consistent with observations of early spring onset in the western United States. Given projected increases in the average annular mode index and associated poleward shifts in the stormtrack, this analysis provides additional evidence that much of the western United States will experience more severe drought conditions over the next several decades, irrespective of changes in temperature, because of an earlier shift to warm-season circulation patterns.

UR - http://www.scopus.com/inward/record.url?scp=57049157719&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=57049157719&partnerID=8YFLogxK

U2 - 10.1029/2008GL034828

DO - 10.1029/2008GL034828

M3 - Article

AN - SCOPUS:57049157719

VL - 35

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 17

M1 - L17701

ER -