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Annual summer, early winter, and total winter seasonal precipitation metrics, in millimeters, for Alaska and Northwest Canada. Seasonal metrics were calculated from monthly data with season lengths calculated from the piecewise cubic hermite interpolating polynomial calculated from monthly temperature data used to calculate our degree-day dataset. Input monthly data from the Scenarios Network for Alaska + Arctic Planing, consisting of downscaled CRU TS 4.0 historic estimates of monthly temperature were used for the period from 1901-2020, and downscaled CMIP5/AR5 projected estimates of monthly temperature were used from the period from 2006-2100. Summer precipitation and early winter precipitation were calculated...
The datasets presented here include the Climate Priming Index, degree-day, and seasonal precipitation data used as inputs to the index for the state of Alaska. The data is presented for two time periods: a historic period from 1901-2020, and a projected period from 2000-2100 using 3 climate scenarios. The climate priming index was developed to identify years where the climatic conditions support the initiation of thermokarst processes in areas of ice-rich permafrost. The Climate Priming Index is comprised of 6 components calculated from cumulative distribution functions based on 5 unique variables: freezing degree-days, thawing degree-days, summer precipitation, early winter precipitation, and total winter precipitation....
Annual freezing degree-day and thawing degree-day metrics for the state of Alaska and Northwest Canada. Degree-days were estimated using integration of a piecewise cubic hermite interpolating polynomial calculated from monthly data. Input monthly data from the Scenarios Network for Alaska + Arctic Planing, consisting of downscaled CRU TS 4.0 historic estimates of monthly temperature, were used for the period from 1901-2020, and downscaled CMIP5/AR5 projected estimates of monthly temperature were used from the period from 2006-2100. Thawing degree-days were calculated from 1901-2100, and freezing degree-days from 1901-2099.
The Climate Priming Index was created to identify periods where thermokarst activity may be initiated based on climatic influences. The annual Index assumes that years following periods of extreme, above average, temperatures and precipitation create pulse events leading to thermokarst formation. The Index is composed of 6 components calculated from cumulative distribution functions based on 5 unique variables: freezing degree-days, thawing degree-days, summer precipitation, early winter precipitation, and total winter precipitation. The index is a value from 0-6, and based on an analysis of historic thermokarst events we determined that an Index value > 4 shows that thermokarst is likely to form. We calculated...
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