Data for A Comparison of National Water Model Retrospective Analysis Snow Outputs at SNOTEL Sites Across the Western U.S.


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Created: Feb 06, 2021 at 12:01 a.m.
Last updated: Jun 23, 2021 at 8:15 p.m.
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Abstract

This resource contains the data and scripts used for: Garousi-Nejad, I. and Tarboton, D. (2021), "A Comparison of National Water Model Retrospective Analysis Snow Outputs at SNOTEL Sites Across the Western U.S.", Hydrological Processes, under review. This will be updated/revised after receiving reviewers' comments and will be published on HydroShare.

Abstract from the paper:
This study compares the U.S. National Water Model (NWM) reanalysis snow outputs to observed snow water equivalent (SWE) and snow-covered area fraction (SCAF) at SNOTEL sites across the Western U.S. This was done to evaluate and identify opportunities for improving the modeling of snow in the NWM. SWE was obtained from SNOTEL sites, while SCAF was obtained from MODIS observations at a nominal 500 m grid scale. Retrospective NWM results were at 1000 m grid scale. We compared results for SNOTEL sites to gridded NWM and MODIS outputs for the grid cells encompassing each SNOTEL site. Differences between modeled and observed SWE were attributed to both model errors, as well as errors in inputs, notably precipitation and temperature. The NWM generally under-predicted SWE, partly due to precipitation input differences. There was also a slight general bias for model input temperature to be cooler than observed, counter to the direction expected to lead to under-modeling of SWE. There was also under modeling of SWE for a subset of sites where precipitation inputs were good. Furthermore, the NWM generally tends to melt snow early. There was considerable variability between modeled and observed SCAF that hampered useful interpretation of these comparisons. This is in part due to the model grid SCAF essentially being binary (snow or no snow) while observations from MODIS are much more fractional. However, when SCAF was aggregated across all sites and years, modeled SCAF tended to be more than observed using MODIS. These differences are regional with generally better SWE and SCAF results in the Central Basin and Range and differences tending to become larger the further away regions are from this region. These findings identify areas where predictions from the NWM involving snow may be better or worse, and suggest opportunities for research directed towards model improvements.

Order to follow the developed scripts:
1. Notebook to get the indices of National Water Model V2.0 grid cells containing SNOTL sites
2. Notebook for retrieval of National Water Model V2.0 Retrospective run results at SNOTEL sites
3. Notebooks for post-processing the retrieved National Water Model V2.0 Retrospective run results and inputs at SNOTEL sites
4. Notebook for retrieval of precipitation, air temperature, and snow water equivalent measurements at SNOTEL sites
5. JavaScript code for retrieval of MODIS Collection 6 NDSI snow cover at SNOTEL sites
6. Notebooks for combining the National Water Model results/inputs with observations from SNOTEL and MODIS at SNOTEL sites
7. Notebooks for visualizations reported at A Comparison of National Water Model Retrospective Analysis Snow Outputs at SNOTEL Sites Across the Western U.S.

Subject Keywords

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Resource Level Coverage

Spatial

Coordinate System/Geographic Projection:
WGS84 EPSG:4326
Coordinate Units:
['Decimal degrees']
North Latitude
50.0526°
East Longitude
-100.9215°
South Latitude
29.8250°
West Longitude
-126.1461°

References

Sources

Derived From: Natural Resources Conservation Service SNOTEL
Derived From: NOAA National Water Model Reanalysis at https://console.cloud.google.com/storage/browser/national-water-model-v2?pli=1
Derived From: Omernik Ecoregions level III (Omernik & Griffith, 2014) available from the Commission for Environmental Corporation at http://www.cec.org/north-american-environmental-atlas/terrestrial-ecoregions-level-iii/
Derived From: Hall, D. K. and G. A. Riggs. 2016. MODIS/Terra Snow Cover Daily L3 Global 500m SIN Grid, Version 6. [NDSI_Snow_Cover]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/MODIS/MOD10A1.006, accessed through Google Earth Engine

Related Resources

The content of this resource serves as the data for: Garousi-Nejad, I. and Tarboton, D. (2021), "A Comparison of National Water Model Retrospective Analysis Snow Outputs at SNOTEL Sites Across the Western U.S.", Hydrological Processes, under review

Credits

Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
Utah Water Research Laboratory Graduate Student Research Assistantship for I Garousi-Nejad
National Science Foundation XSEDE: Accelerating Scientific Discovery ACI-1548562

How to Cite

Garousi-Nejad, I., D. Tarboton (2021). Data for A Comparison of National Water Model Retrospective Analysis Snow Outputs at SNOTEL Sites Across the Western U.S., HydroShare, http://www.hydroshare.org/resource/7a51f56c2cf24ae78012ac6a6d4815a6

This resource is shared under the Creative Commons Attribution CC BY.

 http://creativecommons.org/licenses/by/4.0/
CC-BY

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