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Global Distribution of Shallow Groundwater


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Created: Sep 28, 2022 at 7:03 p.m.
Last updated: Nov 03, 2022 at 7:50 p.m.
DOI: 10.4211/hs.9462b23c5e1e46bdae6ef8abcdbed365
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Content types: Multidimensional Content 
Sharing Status: Published
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Abstract

Groundwater (GW) impacts water, energy, and carbon cycles by providing additional moisture to the root zone. Although the interactions of shallow GW and the terrestrial land surface are widely recognized, incorporating shallow GW into the land surface, climate, and agroecosystem models as a lower boundary condition is not yet possible due to the lack of groundwater data.
Here, we provide global maps of the terrestrial land surface areas influenced by shallow GW at daily timesteps. We derived this data using spaceborne soil moisture observations from NASA's SMAP satellite. We used the Level-2 enhanced passive soil moisture (L2_SM_P_E) product to detect shallow GW signals. The presence of shallow GW is obtained using an ensemble machine learning model. The model is trained using results from global simulations. We published the details of our approach in a separate research paper (Soylu and Bras, 2022 - https://ieeexplore.ieee.org/document/9601254).
Our data covers the period from mid-2015 to 2021 (a separate NetCDF file for each year) with a 9 km spatial resolution, the same as the SMAP "Equal Area Scalable Earth" (EASE) grids.

Reference:
Soylu, M.E, and Bras, R.L. "Global Shallow Groundwater Patterns From Soil Moisture Satellite Retrievals." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 15 (2022): 89-101

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
North Latitude
84.6564°
East Longitude
179.9533°
South Latitude
-84.6564°
West Longitude
-179.9533°

Temporal

Start Date:
End Date:

Content

Data Services

The following web services are available for data contained in this resource. Geospatial Feature and Raster data are made available via Open Geospatial Consortium Web Services. The provided links can be copied and pasted into GIS software to access these data. Multidimensional NetCDF data are made available via a THREDDS Data Server using remote data access protocols such as OPeNDAP. Other data services may be made available in the future to support additional data types.

Credits

Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
NASA Detecting Shallow Groundwater and Irrigation Signals from SMAP Soil Moisture Retrieval 80NSSC20K1795

Contributors

People or Organizations that contributed technically, materially, financially, or provided general support for the creation of the resource's content but are not considered authors.

Name Organization Address Phone Author Identifiers
Morgan Johnstone Georgia Institute of Technology
Kevin D. Beale Georgia Institute of Technology

How to Cite

Soylu, M. E., R. L. Bras (2022). Global Distribution of Shallow Groundwater, HydroShare, https://doi.org/10.4211/hs.9462b23c5e1e46bdae6ef8abcdbed365

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

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

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