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    The influence of atmospheric circulation patterns during large snowfall events in New Zealand's Southern Alps (2020)

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    Porhemmat et al (2020)_Large snowfal NZ_joc.6966.pdf (7.276Mb)
    Type of Content
    Journal Article
    UC Permalink
    https://hdl.handle.net/10092/101578
    
    Publisher's DOI/URI
    http://doi.org/10.1002/joc.6966
    
    Publisher
    Wiley
    ISSN
    0899-8418
    1097-0088
    Language
    en
    Collections
    • Science: Journal Articles [1112]
    Authors
    Porhemmat R
    Purdie H
    Zawar‐Reza P
    Zammit C
    Kerr T
    show all
    Abstract

    Large snowfall events contribute significantly to total annual snow accumulation across the maritime Southern Alps. However, the knowledge about atmospheric circulation patterns associated with large snowfall events over the New Zealand Southern Alps is very limited. Daily snow observation data from three automatic weather stations and ERA-Interim reanalysis data were used to investigate the relationship between atmospheric forcing and large snowfall events across the Southern Alps. To do so, analysis of composite anomaly maps during large snowfall events were carried out to identify the common features of the days with heavy snow accumulation. Large snowfall across the Southern Alps are mainly associated with strong negative anomalies of sea level pressure (SLP) located over the southwest of New Zealand’s South Island. These conditions are concurrent with negative anomalies of geopotential heights at 500 (Z500) located in the centre of low pressure systems. However, over New Zealand, days leading to large snowfall events experience positive anomalies of Z500 showing a relatively warm environment during such events in the maritime Southern Alps. Positive anomalies of low-tropospheric temperatures (850 hPa and 1000 hPa) over the Tasman Sea and across the Southern Alps, strong values of integrated vapour transport (IVT) as well as high frequency of local synoptic patterns associated with troughing regimes (~78%) during large snowfall events provide more evidence of the important contribution of warm air flows.

    Citation
    Porhemmat R, Purdie H, Zawar‐Reza P, Zammit C, Kerr T The influence of atmospheric circulation patterns during large snowfall events in New Zealand's Southern Alps. International Journal of Climatology.
    This citation is automatically generated and may be unreliable. Use as a guide only.
    Keywords
    snow; synoptic climatology; anomalies; Southern Alps
    ANZSRC Fields of Research
    37 - Earth sciences::3701 - Atmospheric sciences::370108 - Meteorology
    37 - Earth sciences::3701 - Atmospheric sciences::370105 - Atmospheric dynamics
    Rights
    All rights reserved unless otherwise stated
    http://hdl.handle.net/10092/17651

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