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The 2010/2011 snow season in California's Sierra Nevada: Role of atmospheric rivers and modes of large-scale variability

Guan, Bin ; Molotch, Noah P. ; Waliser, Duane E. ; Fetzer, Eric J. ; Neiman, Paul J.

Water resources research, 2013-10, Vol.49 (10), p.6731-6743 [Periódico revisado por pares]

Washington: Blackwell Publishing Ltd

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  • Título:
    The 2010/2011 snow season in California's Sierra Nevada: Role of atmospheric rivers and modes of large-scale variability
  • Autor: Guan, Bin ; Molotch, Noah P. ; Waliser, Duane E. ; Fetzer, Eric J. ; Neiman, Paul J.
  • Assuntos: Arctic Oscillation ; atmospheric rivers ; El Niño/Southern Oscillation ; Freshwater ; Marine ; Pacific-North American teleconnection pattern ; Sierra Nevada ; Snow ; snow water equivalent ; Winter
  • É parte de: Water resources research, 2013-10, Vol.49 (10), p.6731-6743
  • Notas: NSF - No. EAR1032295
    NASA - No. NNX08AH18G; No. NNXIIAK35A
    istex:FB4F2ED3FBA6D693CFD750ABF39B8CC022AEE876
    ark:/67375/WNG-FWDGRXH1-H
    ArticleID:WRCR20537
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: The anomalously snowy winter season of 2010/2011 in the Sierra Nevada is analyzed in terms of snow water equivalent (SWE) anomalies and the role of atmospheric rivers (ARs)—narrow channels of enhanced meridional water vapor transport between the tropics and extratropics. Mean April 1 SWE was 0.44 m (56%) above normal averaged over 100 snow sensors. AR occurrence was anomalously high during the period, with 20 AR dates during the season and 14 in the month of December 2010, compared to the mean occurrence of nine dates per season. Fifteen out of the 20 AR dates were associated with the negative phases of the Arctic Oscillation (AO) and the Pacific‐North American (PNA) teleconnection pattern. Analysis of all winter ARs in California during water years 1998–2011 indicates more ARs occur during the negative phase of AO and PNA, with the increase between positive and negative phases being ∼90% for AO, and ∼50% for PNA. The circulation pattern associated with concurrent negative phases of AO and PNA, characterized by cyclonic anomalies centered northwest of California, provides a favorable dynamical condition for ARs. The analysis suggests that the massive Sierra Nevada snowpack during the 2010/2011 winter season is primarily related to anomalously high frequency of ARs favored by the joint phasing of −AO and −PNA, and that a secondary contribution is from increased snow accumulation during these ARs favored by colder air temperatures associated with −AO, −PNA, and La Niña. Key Points The anomalously snowy winter season of 2010/11 in the Sierra Nevada is analyzed. An exceptionally large number of atmospheric rivers occurred during the season. The increased AR occurrence is attributed to the joint phasing of AO and PNA.
  • Editor: Washington: Blackwell Publishing Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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