NOAA National Water Model Reanalysis Data at RENCI


An older version of this resource https://doi.org/10.4211/hs.89b0952512dd4b378dc5be8d2093310f is available.
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Created: May 06, 2021 at 12:12 a.m.
Last updated: May 06, 2021 at 12:19 a.m.
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Abstract

This data release provides the reanalysis streamflow data from versions 1.2 and 2.0 of the National Water Model structured for feature level extraction. The impact of this is that user can query time series for a given NHDPlusV2 COMID without downloading the hourly CONUS files and extracting the sample of relevant values.

The data is hosted on the RENCI THREDDS Data Server and is accessible via OPeNDAP at athe follwoing URLs:

Version 1.2
(https://thredds.hydroshare.org/thredds/catalog/nwm/retrospective/catalog.html?dataset=NWM_Retrospective/nwm_retro_full.ncml)
- Spans 1993-01-01 to 2017-12-31
- Contains 219,144 hourly time steps for
- 2729077 NHD reaches

Version 2.0
(https://thredds.hydroshare.org/thredds/catalog/nwm/retrospective/catalog.html?dataset=NWM_Retrospective/nwm_v2_retro_full.ncml)
- Spans 1993-01-01 to 2018-12-31
- Contains 227,903 hourly time steps for
- 2,729,076 NHD reaches

Raw Data
(https://registry.opendata.aws/nwm-archive/)
- 227,000+ hourly netCDF files (depending on version)

Subject Keywords

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Resource Level Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Continental United States
North Latitude
49.6008°
East Longitude
-66.9079°
South Latitude
24.8327°
West Longitude
-124.5641°

Temporal

Start Date:
End Date:

Content

readme.md

NOAA National Water Model (NWM) Reanalysis Data at RENCI

The NOAA National Water Model (NWM) simulates streamflow across on the medium resolution (1:100,000 scale) National Hydrography Dataset Plus Version 2 (NHDPlus). The NHDPlus describes the hydrographic network of the United States discretized into units representing surface water features that share similar hydrologic characteristics. Each surface water feature can be represented as the catchment divide (archetypal watershed for that segment), its flowline, and/or outlet (using the Open Geospatial Consortium HY_Feature terminology). Computationally, NWM forecasts are made by routing water from a land surface model (NOAH-MP) over a 250 meter grid centered on the NHD flowline to the outlet of each NHD catchment. The COMID scheme was adopted as the indexing unit in the NWM such that a forecast for a given COMID is the routed flow rate at the NHD outlet at any given hour.

With each new version of the NWM, a multi-decadal, hourly reanalysis product - forced with the North America Land Data Assimilation System (NLDAS) and the North American Regional Reanalysis (NARR) data - is released. The raw data, stored as hourly netCDF files, are made publicly available on Amazon and Google by the Open Cloud Consortium here.

This data release contains the NWM v1.2 and 2.0 structured for feature level extraction. The impact of this is that user can query time series for a given NHDPlusV2 COMID without downloading the hourly CONUS files and extracting the sample of relevant values. This data is hosted on the RENCI THREDDS Data Server and is accessible via OPeNDAP at:

Version 1.2

  • 1993-01-01 to 2017-12-31
  • Contains 219,144 hourly time steps for
  • 2729077 NHD reaches

Version 2.0

  • 1993-01-01 to 2018-12-31
  • Contains 227,903 hourly time steps for
  • 2,729,076 NHD reaches

DDS

The data description structure (DDS) can be viewed at the NcML page for each respective resource (linked above). More broadly each resource includes:

  • A 1D time array - hours since 1970-01-01 00:00
  • A 1D latitude array - coordinate (Y) information
  • A 1D longitude array - coordinate (X) information WGS84
  • A 1D feature_id array - NHDPlus V2 COMID (NWM forecast ID)
  • A 2D streamflow array - Q (cms) [feature_id, time]

R package

The nwmHistoric R package provides easier interaction with the OPeNDAP resources. Package documentation can be found here and the GitHub repository here.

Collaborators:

Mike Johnson, David Blodgett

Support:

This effort is supported by the Consortium of Universities for the Advancement of Hydrologic Science, Inc. under the HydroInformatics Fellowship. See program here

Publications

J.M. Johnson, David L. Blodgett, Keith C. Clarke, Jon Pollack. (2020). "Optimized time series retrieval from the hourly 1993-2018 NOAA National Water Model Reanalysis Products". Nature Scientific Data. (In Review)

Related Resources

This resource updates and replaces a previous version Johnson, M., D. Blodgett (2020). NOAA National Water Model Reanalysis Data at RENCI, HydroShare, https://doi.org/10.4211/hs.89b0952512dd4b378dc5be8d2093310f

Credits

Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
CUAHSI HydroInformatics Innovation Fellowship National Science Foundation (NSF) Cooperative Agreement No. EAR- 1849458

How to Cite

Johnson, M., D. Blodgett (2021). NOAA National Water Model Reanalysis Data at RENCI, HydroShare, http://www.hydroshare.org/resource/a1e329ad20654e72b7b423f991bf9251

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

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

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