NOAA Climate Data Record (CDR) of AVHRR Daily and Monthly Aerosol Optical Thickness (AOT) over Global Oceans, Version 3.0

AVHRR Aerosol Optical Thickness

browse graphicAOT Trends
The product is the aerosol optical thickness (AOT) at 0.63 micron, which is retrieved from NOAA PATMOS-x level-2B orbital radinace and cloud CDR products. The retrieval is performed for selected spatial (0.1 by 0.1 degree) and temporal (1 time per day per satellite) resolution in cloud free condition during daytime. The final product is daily averaged from all satellite retrivals and in a 0.1 by 0.1 degree equal angle grid (total 1800x3600 grids over the globe). Due to the relatively large uncertainties associated with surface reflectance over water glint area and land surface as well as limited AVHRR retrieval channels, the current algorithm only performs retrieval over none-glint water surface (specifically at the anti-solar side of the orbit and viewing angle is larger than 40 degree away from the specular ray). The final CDR AOT products include daily and monthly products
  • Cite this dataset when used as a source: Zhao, Xuepeng; and NOAA CDR Program (2017): NOAA Climate Data Record (CDR) of AVHRR Daily and Monthly Aerosol Optical Thickness (AOT) over Global Oceans, Version 3.0. [indicate subset used]. NOAA National Centers for Environmental Information. doi:10.7289/V5BZ642P [date accessed].
Download Data
Distribution Formats
  • netCDF (Version: 4)
    • File Specification: The NetCDF data files comply with the Climate and Forecast (CF) Metadata Conventions and the NetCDF Attribute Convention for Dataset Discovery (ACDD).
Distributor Customer Engagement Branch
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
1-828-271-4800
ncei.orders@noaa.gov
Dataset Point of Contact Customer Engagement Branch
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
1-828-271-4800
ncei.orders@noaa.gov
Dataset Point of Contact NOAA Climate Data Record Program Office
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
+1 828-271-4800
avhrr_aot_contacts@noaa.gov
Time Period 1981-01-01 to 2016-09-30 (time interval: 1-day)
Spatial Bounding Box Coordinates
N: 90.0
S: -90.0
E: 180.0
W: -180.0
Spatial Coverage Map
General Documentation
Processing Documents
  • AVHRR Aerosol Optical Thickness (AOT) Source Code Package
    • CDR Source Code
      This source code is for reference only. The source code is provided to maintain transparency of the algorithm and processes used in creating the Climate Data Record (CDR). The source code is not intended to be portable to any computer system(s) beyond that of the original CDR producer's environment.
  • Flow Chart of Version 2 AVHRR Aerosol Optical Thickness Retrieval
  • Climate Algorithm Theoretical Basis Document for AVHRR Aerosol Optical Thickness (AOT)
Associated Resources
Publication Dates
  • publication: 2016-12-01
Edition Version 3
Data Presentation Form Digital image
Dataset Progress Status Complete - production of the data has been completed
Data Update Frequency Quarterly
Purpose This dataset can be utilized in air quality monitoring as well as climate and environmental change studies.
Use Limitations
  • See the Algorithm Theoretical Basis Document for a description of the use limitations for this dataset. Products apply to over-ocean only. The values at polar latitudes (outside 60 degree north or south) are degraded due to surface contamination from ice and degraded cloud screening at polar latitudes. The quality of the output CDR data is dependent on the quality of the input data. As such, the near real-time data is labeled as an Interim operational CDR (ICDR) or preliminary CDR instead of a final CDR, indicating that it has not yet been fully vetted for climate applications. The near real-time ICDR/preliminary data will transition to final CDR status after the data have undergone further analysis and processing. The expected time lag of the final CDR transition is approximately one year. The state of a data file is indicated within each file name.
Dataset Citation
  • Cite this dataset when used as a source: Zhao, Xuepeng; and NOAA CDR Program (2017): NOAA Climate Data Record (CDR) of AVHRR Daily and Monthly Aerosol Optical Thickness (AOT) over Global Oceans, Version 3.0. [indicate subset used]. NOAA National Centers for Environmental Information. doi:10.7289/V5BZ642P [date accessed].
Cited Authors
  • Zhao, Xuepeng
    DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
  • NOAA CDR Program
    DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Principal Investigators
  • Zhao, Xuepeng
    DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Collaborators
  • NOAA CDR Program
    DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Publishers
  • NOAA National Centers for Environmental Information
Theme keywords Global Change Master Directory (GCMD) Science Keywords
  • Earth Science > Atmosphere > Aerosols
Global Climate Observing System (GCOS) Essential Climate Variables (ECVs)
  • Atmospheric - Composition - Aerosol Properties
Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
  • DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Platform keywords Global Change Master Directory (GCMD) Platform Keywords
  • POES: NOAA Polar Orbiting Environmental Satellites
Instrument keywords Global Change Master Directory (GCMD) Instrument Keywords
  • AVHRR > Advanced Very High Resolution Radiometer
  • AVHRR-2 > Advanced Very High Resolution Radiometer-2
  • AVHRR-3 > Advanced Very High Resolution Radiometer-3
Place keywords Global Change Master Directory (GCMD) Location Keywords
  • Geographic Region > Global
Project keywords Global Change Master Directory (GCMD) Project Keywords
  • NOAA Climate Data Record (CDR) Program
  • NOAA OneStop Project
Data Resolution keywords Global Change Master Directory (GCMD) Horizontal Data Resolution Keywords
  • 10 km - < 50 km or approximately .09 degree - < .5 degree
Global Change Master Directory (GCMD) Vertical Data Resolution Keywords
  • > 1 km
Global Change Master Directory (GCMD) Temporal Data Resolution Keywords
  • Hourly - < Daily
Global Change Master Directory (GCMD) Horizontal Data Resolution Keywords
  • 10 km - < 50 km or approximately .09 degree - < .5 degree
Global Change Master Directory (GCMD) Vertical Data Resolution Keywords
  • > 1 km
Global Change Master Directory (GCMD) Temporal Data Resolution Keywords
  • Hourly - < Daily
Global Change Master Directory (GCMD) Horizontal Data Resolution Keywords
  • 10 km - < 50 km or approximately .09 degree - < .5 degree
Global Change Master Directory (GCMD) Vertical Data Resolution Keywords
  • > 1 km
Global Change Master Directory (GCMD) Temporal Data Resolution Keywords
  • Hourly - < Daily
Stratum keywords Global Change Master Directory (GCMD) Location Keywords
  • Vertical Location > Troposphere
Use Constraints
  • Cite this dataset when used as a source: Zhao, Xuepeng; and NOAA CDR Program (2017): NOAA Climate Data Record (CDR) of AVHRR Daily and Monthly Aerosol Optical Thickness (AOT) over Global Oceans, Version 3.0. [indicate subset used]. NOAA National Centers for Environmental Information. doi:10.7289/V5BZ642P [date accessed].
  • See the Use Agreement for this CDR available on the CDR page.
  • Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
Access Constraints
  • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
Fees
  • In most cases, electronic downloads of the data are free, however fees may apply for data certifications, copies of analog materials, and data distribution on physical media.
Lineage information for: dataset
Lineage Statement The data were produced by and are archived at the NOAA National Centers for Environmental Information (NCEI).
Processor
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Processing Steps
  • For a description of the processing steps, see the Algorithm Theoretical Basis Document and Data Flow Diagram for this dataset.
Processing Documents
    • AVHRR Aerosol Optical Thickness (AOT) Source Code Package
      • CDR Source Code
        This source code is for reference only. The source code is provided to maintain transparency of the algorithm and processes used in creating the Climate Data Record (CDR). The source code is not intended to be portable to any computer system(s) beyond that of the original CDR producer's environment.
    • Flow Chart of Version 2 AVHRR Aerosol Optical Thickness Retrieval
Source Datasets
  • NOAA Climate Data Record (CDR) of Reflectance and Brightness Temperatures from AVHRR Pathfinder Atmospheres - Extended (PATMOS-x), Version 5.3
Lineage information for: repository
Processing Steps
  • 2015-04-22T00:00:00 - NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
Last Modified: 2018-05-25
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