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MERRA-2 Data and Analytic Services at NASA GES DISC for Climate Extremes StudyNASA's climate reanalysis datasets from the Modern Era Retrospective-analysis for Research and Applications, Version 2 (MERRA-2) contains numerous long-term atmosphere, land, and ocean data products from 1980-present. MERRA-2 datasets, such as precipitation, soil moisture, and temperature, have been used widely to study extreme events. The native archived MERRA-2 data files are day-file (hourly time interval) and month-file, containing up to 125 parameters in one file. Due to the large number of data files and volumes, it is challenging for users, especially the applications research community, to handle the original hourly data files for long time periods to analyze extreme events. In this presentation, we review MERRA-2 data for studies of extreme conditions, and demonstrate analytic services at the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC). One of the current operational services, 'subsetter', allows users to download only specific data of interest, i.e. data selected by parameter, region, and time period. New services are under development that will provide more 'on-the-fly' statistical calculations when downloading data; improve efficiency when accessing long time-series data. We will provide additional "How-to" resources that include step-by-step instructions on data access and usage. We have tested restructuring of day-files in an optimized data cube, which has significantly improved system performance for accessing long time-series. Overall performance is associated with cube size and structure, data compression method, and how the data are accessed. The optimized data cube structure will enable better online analytic services for statistical analysis and extreme events mining. To demonstrate the service, we use an extreme drought associated with the anomalous 2016 monsoon over southern Asia. This prototype time-series service may be augmented in the cloud infrastructure in the future.
Document ID
20190029205
Acquisition Source
Goddard Space Flight Center
Document Type
Presentation
Authors
Shen, Suhung
(George Mason University Fairfax, VA, United States)
Ostrenga, Dana
(Adnet Systems, Inc. Greenbelt, MD, United States)
Vollmer, Bruce
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Li, Angela
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Meyer, David
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 20, 2019
Publication Date
July 28, 2019
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
GSFC-E-DAA-TN71667
Meeting Information
Meeting: AOGS - Annual Meeting of Asia Oceania Geosciences Society
Location: Singapore
Country: Singapore
Start Date: July 28, 2019
End Date: August 2, 2019
Sponsors: Asia Oceania Geosciences Society (AOGS)
Funding Number(s)
CONTRACT_GRANT: 80GSFC17C0003
CONTRACT_GRANT: 80NSSC18M0092
Distribution Limits
Public
Copyright
Use by or on behalf of the US Gov. Permitted.
Technical Review
Professional Review
Keywords
data access
analytic services
MERRA-2
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