GRACE Global Groundwater Data

GRACE Global Groundwater Data

Postby podaac » Fri Mar 23, 2018 2:43 pm

User Inquiry:
I am trying to access GRACE groundwater data through the podaac website for Punjab India. The data is for an academic project. I am having trouble finding the data associated with this region using the site tools. I have been able to extract the North American data files through GES DISC, but I am not finding groundwater specific information on the global site. I am not an environmental scientist, so this is admittedly beyond the research scope, but would contribute to the validity of the project.

Thank you in advance for your help!

Reply to User:
Thank you for your inquiry.

To better to assist you, could you provide me more information about datasets you are looking for, such as which dataset and site tools you were using. Meanwhile, I recommend you to look at the global mascon products (https://podaac.jpl.nasa.gov/datasetlist?search=mascon).

You can see more detailed information about the products from GRACE product site as well: https://grace.jpl.nasa.gov/mission/grace/

User Update:
Thank you very much for your help. I am not familiar with the site and had been performing a general search inquiry in the dataset discovery. I could not find any readings for groundwater. I am looking for granular data that illustrates groundwater levels of aquifers and basins of the southern part of the state of Punjab, IN. It appears that mascon may provide this information, but if you have any further suggestions, please let me know. Due to my lack of familiarity with GRACE I had extracted this dataset initially: https://disc.gsfc.nasa.gov/datasets/GRA ... .0/summary
I am not a statistician and so I just read how to do this online and realized after that the set is the data type that we are looking for, but was for only North America.

Update to User:
Please try the PO.DAAC mascon data link at: https://podaac.jpl.nasa.gov/dataset/TEL ... ID_RL05_V2. You will find some information about the mascon dataset. Please also visit GRACE project website for more information (https://grace.jpl.nasa.gov/data/get-dat ... l_mascons/). The data is a global dataset with 100 km resolution, showing the mass changes (anomaly) . There are many publications listed on that website as well. You may find right solution. If you have any questions about PO.DAAC and how to get the data, please let me know.
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Re: GRACE Global Groundwater Data

Postby mgierach » Tue Mar 27, 2018 9:03 am

There is no official "GRACE Global Groundwater Data”. What one does is get the GRACE Total Terrestrial Water Storage Anomaly (TWSA). For example: https://podaac-opendap.jpl.nasa.gov/ope ... RI/netcdf/
Then, based on estimates of other components of the terrestrial water cycle (soil moisture, snow, canopy water, surface water) which are most often inferred from models of the land surface, one can extract the Ground Water Storage Anomaly. Examples of how this is done include:
https://www.nature.com/articles/nature08238
https://agupubs.onlinelibrary.wiley.com ... 10GL046442
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