NRT L3 Value-added Aerosol Optical Depth
Entry ID: MODAODHD

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Summary
Abstract: MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS with its 2330 km viewing swath width provides almost daily global coverage. It acquires data in 36 high spectral resolution bands between 0.415 to 14.235 micron with spatial resolutions of 250m(2 bands), 500m(5 bands),and 1000m (29 bands). MODIS sensor counts, calibrated radiances, geolocation products and all derived geophysical atmospheric and ocean products are archived at various DAACs and has been made available to public since April 2000.

The shortname for this level-3 MODIS aerosol product is MODAODHD. The Naval Research Laboratory and the University of North Dakota developed this value-added aerosol optical depth dataset based on MODIS Level 2 aerosol products. MODAODHD is a gridded product and is specifically designed for quantitative applications including data assimilation and model validation. It is available through LANCE-MODIS. It offers several enhancements over the MODIS Level 2 data on which it is based. These enhancements include stringent filtering to reduce outliers, eliminate cloud contamination, and exclude conditions where aerosol detection is likely to be inaccurate; reduction of systematic biases over land and ocean by empirical corrections; reduction of random variation in AOD values by spatial averaging; quantitative estimation of uncertainty for each AOD data point.

he MxDAODHD granules are produced every six hours, and time-stamped 00:00, 06:00, 12:00, and 18:00 (all times UTC). Each granule includes MODIS observations from +/-3 hours from the timestamp (e.g. 12:00 product includes MODIS data from 09:00-15:00 UTC). Production is initiated as soon as the Level 2 inputs become available in the LANCE system.

See the LANCE-MODIS page for more data set
information: http://earthdata.nasa.gov/data/near-real-time-data/data-products/modis
or
visit the product page:
http://earthdata.nasa.gov/about-eosdis/news/nrt-value-added-modis-aerosol-optical-depth-product-available

Related URL
Link: GET DATA > LANCE
Description: Near real-time (NRT) data are available from MODAPS for certain Aqua and Terra MODIS L0, L1, L2, L2G, and L3 products. Whereas the standard MODIS forward processing acquires 2-hour L0 files for Aqua and Terra from EDOS within 7-8 hours of real time, LANCE-MODIS acquires session-based L0 files from EDOS and the end of the session is available within 10-30 minutes after real time.


Link: GET DATA > LAADS
Description: Web site for MODIS Collection 4 atmosphere and Collection 5 L1B, Geo and atmosphere data ordering.
Web site for Suomi NPP VIIRs, ENVISAT MERIS, and Ancillary data ordering.


Link: GET DATA > ECHO
Description: Refine your granule search with ECHO's next generation Earth Science discovery tool (Reverb) using information from this record.


Link: VIEW PROJECT HOME PAGE
Description: Land Atmosphere Near Real-Time Capability for EOS


Link: VIEW RELATED INFORMATION
Description: View data set description.


Geographic Coverage
 N: 90.0 S: -90.0  E: 180.0  W: -180.0

Data Set Citation
Dataset Title: MODIS/Terra NRT value-added Aerosol Optical Depth Product
Version: Collection 5.1
Dataset DOI: 10.5067/MODIS/MODAODHD.051
Online Resource: http://earthdata.nasa.gov/about-eosdis/news/nrt-value-added-modis-a...


Temporal Coverage
Start Date: 2012-12-29


Location Keywords
GEOGRAPHIC REGION > GLOBAL


Data Resolution
Latitude Resolution: 0.5 deg
Longitude Resolution: 0.5 degree
Temporal Resolution: 6 hr


Science Keywords
ATMOSPHERE >AEROSOLS >AEROSOL BACKSCATTER    [Definition]
ATMOSPHERE >AEROSOLS >AEROSOL EXTINCTION    [Definition]
ATMOSPHERE >AEROSOLS >AEROSOL OPTICAL DEPTH/THICKNESS    [Definition]
ATMOSPHERE >AEROSOLS >AEROSOL OPTICAL DEPTH/THICKNESS >ANGSTROM EXPONENT    [Definition]
ATMOSPHERE >AEROSOLS >AEROSOL PARTICLE PROPERTIES    [Definition]
ATMOSPHERE >AEROSOLS >AEROSOL RADIANCE    [Definition]
ATMOSPHERE >AEROSOLS >CARBONACEOUS AEROSOLS    [Definition]
ATMOSPHERE >AEROSOLS >CLOUD CONDENSATION NUCLEI    [Definition]
ATMOSPHERE >AEROSOLS >DUST/ASH/SMOKE    [Definition]
ATMOSPHERE >AEROSOLS >NITRATE PARTICLES    [Definition]
ATMOSPHERE >AEROSOLS >ORGANIC PARTICLES    [Definition]
ATMOSPHERE >AEROSOLS >PARTICULATE MATTER    [Definition]
ATMOSPHERE >AEROSOLS >SULFATE PARTICLES    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >OPTICAL DEPTH/THICKNESS    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >RADIATIVE FLUX    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >REFLECTANCE    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Platform
TERRA >Earth Observing System, TERRA (AM-1)    [Information]


Instrument
MODIS >Moderate-Resolution Imaging Spectroradiometer    [Information]


Project
DODS >Distributed Oceanographic Data System    [Information]
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]
TERRA >Earth Observing System (EOS), TERRA    [Information]


Quality
The 'version 051' or 'collection 051' product is the latest version available. The quality of this version 051 product is established as 'Validated' . This means its accuracy has been assessed over a widely distributed set of locations and time periods via several ground-truth and validation efforts. Results are peer-reviewed and published at scientific conferences and workshops.


Use Constraints
Near real-time products are generated and available to registered users via FTP with an average latency of less than 3 hours. These products should be used in fields where timeliness of data is vital to the program, such as numerical weather prediction and forecasting, monitoring of natural hazards, disaster relief, agriculture and homeland security.

Standard science products should be used for latency independent research and applications, long term studies and trend analyses. Standard products are created using the best available ancillary, calibration and ephemeris information and are an internally consistent, well-calibrated record of the Earth’s geophysical properties to support science. MODIS standard products are available from LAADS Web at:
http://ladsweb.nascom.nasa.gov/


Keywords
AEROSOL OPTICAL DEPTH
AEROSOL OPTICAL THICKNESS
AEROSOL INDEX
Near Real Time (NRT)
LANCE
EOSDIS


Data Set Progress
IN WORK


Originating Center
LANCE-MODIS


Data Center
L1 and Atmosphere Archive and Distribution System,Biospheric Information Systems Branch, Hydrospheric and Biospheric Sciences Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA    [Information]
Data Center URL: http://ladsweb.nascom.nasa.gov/
Dataset ID: MODAODHD Collection 5.1

Data Center Personnel
Name: LAADS USER SUPPORT TEAM
Phone: 1-800-596-8132
Fax: 301-867-2151
Email: MODAPSUSO at lists.nasa.gov
Contact Address:
LAADS User Support Team
NASA/GSFC
Mail Code: 619
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


Personnel
ASAD ULLAH
Role: DIF AUTHOR
Phone: 302-731-2915
Email: asad.ullah at nasa.gov


Publications/References
Hyer, E. J., J. S. Reid, and J. Zhang (2011), An over-land aerosol optical depth data set for data assimilation by filtering, correction, and aggregation of MODIS Collection 5 optical depth retrievals, Atmospheric Measurement Techniques, 4, 379-408, doi: 10.5194/amt-4-379-2011.

Levy, R. C., L. A. Remer, S. Mattoo, E. F. Vermote, and Y. J. Kaufman (2007), Second-generation operational algorithm: Retrieval of aerosol properties over land from inversion of Moderate Resolution Imaging Spectroradiometer spectral reflectance, J. Geophys. Res.-Atmos., 112(D13), D13211.

Remer, L. A., et al. (2005), The MODIS aerosol algorithm, products, and validation, J. Atmos. Sci., 62(4), 947-973.

Shi, Y., Zhang, J., Reid, J. S., Holben, B., Hyer, E. J., and Curtis, C.: An analysis of the collection 5 modis over-ocean aerosol optical depth product for its implication in aerosol assimilation, Atmos. Chem. Phys., 11, 557-565, 10.5194/acp-11-557-2011, 2011.

Zhang, J. L., and Reid, J. S.: MODIS aerosol product analysis for data assimilation: Assessment of over-ocean level 2 aerosol optical thickness retrievals, J. Geophys. Res.-Atmos., 111, 2006.

Zhang, J. L., Reid, J. S., Westphal, D. L., Baker, N., and Hyer, E. J.: A System for Operational Aerosol Optical Depth Data Assimilation over Global Oceans, Journal of Geophysical Research, 113, doi:10.1029/2007JD009065, 2008.

Creation and Review Dates
DIF Creation Date: 2013-01-07
Last DIF Revision Date: 2013-06-10

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