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    Spring Onset in the Sierra Nevada: When Is Snowmelt Independent of Elevation?

    Source: Journal of Hydrometeorology:;2004:;Volume( 005 ):;issue: 002::page 327
    Author:
    Lundquist, Jessica D.
    ,
    Cayan, Daniel R.
    ,
    Dettinger, Michael D.
    DOI: 10.1175/1525-7541(2004)005<0327:SOITSN>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Short-term climate and weather systems can have a strong influence on mountain snowmelt, sometimes overwhelming the effects of elevation and aspect. Although most years exhibit a spring onset that starts first at lowest and moves to highest elevations, in spring 2002, flow in a variety of streams within the Tuolumne and Merced River basins of the southern Sierra Nevada all rose synchronously on 29 March. Flow in streams draining small high-altitude glacial subcatchments rose at the same time as that draining much larger basins gauged at lower altitudes, and streams from north- and south-facing cirques rose and fell together. Historical analysis demonstrates that 2002 was one among only 8 yr with such synchronous flow onsets during the past 87 yr, recognized by having simultaneous onsets of snowmelt at over 70% of snow pillow sites, having discharge in over 70% of monitored streams increase simultaneously, and having temperatures increase over 12°C within a 5-day period. Synchronous springs tend to begin with a low pressure trough over California during late winter, followed by the onset of a strong ridge and unusually warm temperatures. Synchronous springs are characterized by warmer than average winters and cooler than average March temperatures in California. In the most elevation-dependent, nonsynchronous years, periods of little or no storm activity, with warmer than average March temperatures, precede the onset of spring snowmelt, allowing elevation and aspect to influence snowmelt as spring arrives gradually.
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      Spring Onset in the Sierra Nevada: When Is Snowmelt Independent of Elevation?

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4206369
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    contributor authorLundquist, Jessica D.
    contributor authorCayan, Daniel R.
    contributor authorDettinger, Michael D.
    date accessioned2017-06-09T16:17:39Z
    date available2017-06-09T16:17:39Z
    date copyright2004/04/01
    date issued2004
    identifier issn1525-755X
    identifier otherams-65173.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4206369
    description abstractShort-term climate and weather systems can have a strong influence on mountain snowmelt, sometimes overwhelming the effects of elevation and aspect. Although most years exhibit a spring onset that starts first at lowest and moves to highest elevations, in spring 2002, flow in a variety of streams within the Tuolumne and Merced River basins of the southern Sierra Nevada all rose synchronously on 29 March. Flow in streams draining small high-altitude glacial subcatchments rose at the same time as that draining much larger basins gauged at lower altitudes, and streams from north- and south-facing cirques rose and fell together. Historical analysis demonstrates that 2002 was one among only 8 yr with such synchronous flow onsets during the past 87 yr, recognized by having simultaneous onsets of snowmelt at over 70% of snow pillow sites, having discharge in over 70% of monitored streams increase simultaneously, and having temperatures increase over 12°C within a 5-day period. Synchronous springs tend to begin with a low pressure trough over California during late winter, followed by the onset of a strong ridge and unusually warm temperatures. Synchronous springs are characterized by warmer than average winters and cooler than average March temperatures in California. In the most elevation-dependent, nonsynchronous years, periods of little or no storm activity, with warmer than average March temperatures, precede the onset of spring snowmelt, allowing elevation and aspect to influence snowmelt as spring arrives gradually.
    publisherAmerican Meteorological Society
    titleSpring Onset in the Sierra Nevada: When Is Snowmelt Independent of Elevation?
    typeJournal Paper
    journal volume5
    journal issue2
    journal titleJournal of Hydrometeorology
    identifier doi10.1175/1525-7541(2004)005<0327:SOITSN>2.0.CO;2
    journal fristpage327
    journal lastpage342
    treeJournal of Hydrometeorology:;2004:;Volume( 005 ):;issue: 002
    contenttypeFulltext
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