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Precipitation Group. What is the frequency and distribution of global snowfall? • What is the intraseasonal and interannual frequency and distribution of snowfall? Global or regional?

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Precipitation group
Precipitation Group

What is the frequency and distribution of global snowfall?

• What is the intraseasonal and interannual frequency and distribution of snowfall? Global or regional?

  • • How many snowfall events contribute to the formation of snowpacks /where and the world’s freshwater storage?


PROBLEM STATEMENT:

  • Snowfall is a major component of the Earth’s precipitation/water budget but is poorly measured. Although expected to be a sensitive indicator of climate variability and changing

  • Although poorly measured, snowfall is the most common form of precipitation in many high-latitude and mountainous regions of the world. The frequency of snowfall events varies widely. In the high latitudes some regions, snowpacks develop from a high frequency of light-snowfall events. Elsewhere, fewer but larger events form the snowpack


Clpp measurement approch limitations
CLPP MEASUREMENT APPROCH / limitations:

  • Mass and energy balance methods

    • Snowfall, melt, sublimation, blowing snow

    • Rainfall input into snowpack, can we measure rainfall in warm winter and spring/fall? Can GPM help to get rainfall data?

      • Daily is the standard for climate obs,

      • Hydrology/flood forecast need end of winter total SWE

      • Monthly swe is good for mountain regions for reservior operations

  • Snow density change impact the algorithm?



Clpp duration
CLPP duration crease errors higher then 10%

  • 3 year or more,

  • Change the sample frequency among years, such as, daily sampling for melt season to see the melt processes??


Validation data
Validation data crease errors higher then 10%

  • Need both SWE and snowfall data

    • SWE: snow survey, snowtel network, Wyoming gauges (in Alaska), others?

    • Snowfall: climate network data, undercatch correction, US CRN/DFIR Geonor recoding gauge, 5-10 min precpi, GCOS, ASOS, Canada auto gauge network

    • Wind data, temp data

    • Gridded data from snow data


International effort
International Effort crease errors higher then 10%

  • Canadian space agency???

  • ESA???


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