Readme file for: SnowClim: Pre-industrial Snow Data (https://www.hydroshare.org/resource/fc621d75985c4695b6758ade312241c6/) This .txt file was generated on 4 Nov 2021 by A.C. Lute. Summary: ------------------------------------------------------------------------ This directory contains snow metrics for the pre-industrial period and represents a subset of the SnowClim Dataset (https://www.hydroshare.org/resource/acc4f39ad6924a78811750043d59e5d0/). The SnowClim Dataset was developed following the methods presented in Lute et al., (in prep). The pre-industrial snow data was created by first downscaling 4 km climate forcings from the Weather Research and Forecasting (WRF) model (Rasmussen and Liu, 2017) over a thirteen year period (1 Oct 2000 to 30 Sep 2013) and then perturbing the downscaled data using multi-model mean deltas from CMIP5 to create climate forcing data that reflects conditions during 1850-1879. This climate data was then used to force the SnowClim snow model. Snow model outputs were summarized into snow metrics at ~210 m spatial resolution for the western US. Additional details about forcing data preparation, model physics, model calibration, and application to the western US domain can be found in Lute et al., (in prep). File Organization: ------------------------------------------------------------------------ Snow metrics are available in separate files. For accessibility, metrics are available in both GeoTiff and netCDF format. The suffix '_PRE' indicates that the data represents conditions under pre-industrial climate. Metrics with values for each year use snow years, which we define as September 1 - August 31. For example, snow year 2001 is the year starting on September 1, 2000 and ending on August 31, 2001. Metrics with values for each month have values for January through December. Metrics: ------------------------------------------------------------------------ - annual maximum SWE units: meters (m) Annual maximum snow water equivalent (m), averaged across years. - date of annual maximum SWE units: Julian day of year Julian day of annual maximum snow water equivalent (m), averaged across years. - largest snowfall event units: meters (m) Liquid water equivalent thickness of the largest three consecutive day snowfall total each year (m). - date of largest snowfall event units: Julian day of year Julian day of the largest three consecutive day snowfall total each year. - snow cover days units: days Monthly number of days with snow depth greater than 10 mm, averaged across years. - snow duration units: days Number of days between the start and end of snow cover, averaged across years. The start of snow cover is defined as the first day of the first period of 5 consecutive days with snow depth greater than 10 mm, and day of snow cover end is defined as the last day of the last period of 5 consecutive days with snow depth greater than 10 mm. - snow free days units: days Annual number of days with snow depth less than 10 mm between the start and end of snow cover, averaged across years. The start of snow cover is defined as the first day of the first period of 5 consecutive days with snow depth greater than 10 mm, and day of snow cover end is defined as the last day of the last period of 5 consecutive days with snow depth greater than 10 mm. - date of snow cover start units: Julian day of year Julian day of beginning of snow cover, averaged across years. The day of beginning of snow cover is defined as the first day of the first period of 5 consecutive days with snow depth greater than 10 mm. - date of snow cover end units: Julian day of year Julian day of end of snow cover, averaged across years. The day of the end of snow cover is defined as the last day of the last period of 5 consecutive days with snow depth greater than 10 mm. - min snow depth: units: meters (m) Monthly minimum snow depth (m), averaged across years. - mean snow depth units: meters (m) Monthly mean snow depth (m), averaged across years. - max snow depth units: meters (m) Monthly maximum snow depth (m), averaged across years. - min SWE units: meters (m) Monthly minimum snow water equivalent (m), averaged across years. - mean SWE units: meters (m) Monthly mean snow water equivalent (m), averaged across years. - max SWE units: meters (m) Monthly maximum snow water equivalent (m), averaged across years. - snowfall units: meters (m) Monthly total snowfall water equivalent (m), averaged across years. Sharing and access information: ------------------------------------------------------------------------ 1. Licenses/restrictions placed on the data: This resource is shared under the Creative Commons Attribution CC BY. 2. Links to publications that cite or use the data: none yet 3. Links to other publicly accessible locations of the data: none 4. Links/relationships to ancillary data sets: SnowClim Model and Dataset (https://www.hydroshare.org/resource/acc4f39ad6924a78811750043d59e5d0/) SnowClim Model Code (https://www.hydroshare.org/resource/dc3a40e067bf416d82d87c664d2edcc7/) SnowClim Pre-industrial Climate Data (https://www.hydroshare.org/resource/0c852b12f668438fb9f0188a1cc6e8a9/) SnowClim Present Climate Data (https://www.hydroshare.org/resource/7e3678f00ad74bfd881f91d6f6f81494/) SnowClim Present Snow Data (https://www.hydroshare.org/resource/2dbd6e849a754c0981b99ee7c09031eb/) SnowClim Future Climate Data (https://www.hydroshare.org/resource/36895c3a2c53409893f5ba02ee142767/) SnowClim Future Snow Data (https://www.hydroshare.org/resource/96cba44cd74843639f855d7c9e22024b/) 5. Was data derived from another source? yes. Climate forcing data was downscaled from the dataset of Rasmussen and Liu, 2017. 6. To cite this data, please reference both of the following: Lute, A., J. Abatzoglou, T. Link (2021). SnowClim Model and Dataset, HydroShare, http://www.hydroshare.org/resource/acc4f39ad6924a78811750043d59e5d0 Lute, A.C., John Abatzoglou, and Timothy Link (in prep), SnowClim: high-resolution snow model and data for the Western United States. In preparation for submission to Geoscientific Model Development. Authors: ------------------------------------------------------------------------ A.C. Lute, University of Idaho John Abatzoglou, University of California, Merced Timothy Link, University of Idaho Contact Information: ------------------------------------------------------------------------ Please contact A.C. Lute with questions, concerns, or comments. Current contact information is available on the webpage this file was downloaded from. References: ------------------------------------------------------------------------ Lute, A.C., John Abatzoglou, and Timothy Link (in prep), SnowClim: high-resolution snow model and data for the Western United States. In preparation for submission to Geoscientific Model Development. Rasmussen, R., and C. Liu. 2017. High Resolution WRF Simulations of the Current and Future Climate of North America. Research Data Archive at the National Center for Atmospheric Research, Computational and Information Systems Laboratory. https://doi.org/10.5065/D6V40SXP. Accessed 24 Sep 2018.