Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Skip to content

NOAA Climate Data Record (CDR) of AVHRR Daily and Monthly Aerosol Optical Thickness over Global Oceans, Version 2.0 (Version Superseded)

Metadata Updated: September 19, 2023

Note: This dataset version has been superseded by a newer version. It is highly recommended that users access the current version. Users should only use this version for special cases, such as reproducing studies that used this version. This NOAA Climate Data Record (CDR) of Aerosol Optical Thickness (AOT) is derived from data taken over global oceans from the PATMOS-x AVHRR level-2b channel 1 (0.63 micron) orbital clear-sky radiance. The retrieval is performed for selected spatial (8-km) and temporal (1 time per day) resolution in cloud free condition during daytime over global oceans. The AVHRR AOT CDR version 2 extends from 1981 to 2009 and includes both daily and monthly data in an equal angle grid (0.1x0.1 degree). Version 2 has improved cloud screening and data processing from version 1. 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 non-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).

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources

Dates

Metadata Date September 13, 2023
Metadata Created Date October 28, 2022
Metadata Updated Date September 19, 2023
Reference Date(s) May 19, 2014 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from ncdc

Graphic Preview

AVHRR AOT monthly file example

Additional Metadata

Resource Type Dataset
Metadata Date September 13, 2023
Metadata Created Date October 28, 2022
Metadata Updated Date September 19, 2023
Reference Date(s) May 19, 2014 (publication)
Responsible Party DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce (Point of Contact)
Contact Email
Guid gov.noaa.ncdc:C00858
Access Constraints Cite as: Xuepeng Zhao, Pui Chan, and NOAA CDR Program (2014): NOAA Climate Data Record (CDR) of AVHRR Daily and Monthly Aerosol Optical Thickness over Global Oceans, Version 2.0. [indicate subset used]. NOAA National Centers for Environmental Information. doi:10.7289/V5SB43PD [access date]., 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., 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.
Bbox East Long 180.0
Bbox North Lat 90.0
Bbox South Lat -90.0
Bbox West Long -180.0
Coupled Resource
Frequency Of Update notPlanned
Graphic Preview Description AVHRR AOT monthly file example
Graphic Preview File https://www.ncei.noaa.gov/pub/data/metadata/images/C00858.PNG
Graphic Preview Type PNG
Harvest Object Id 63854566-6f5f-44cb-a454-42864c961adb
Harvest Source Id 2cb3ef77-1683-4c2a-9119-dc65e50917c6
Harvest Source Title ncdc
Licence *Note: This dataset version has been superseded by a newer version. It is highly recommended that users access the current version. Users should only use this version for special cases, such as reproducing studies that used this version.*, For a complete description of use limitations see the Algorithm Theoretical Basis Document.
Lineage For more information, see associated processing documentation.
Metadata Language eng; USA
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-180.0, -90.0], [180.0, -90.0], [180.0, 90.0], [-180.0, 90.0], [-180.0, -90.0]]]}
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 1981-01-01
Temporal Extent End 2009-12-31

Didn't find what you're looking for? Suggest a dataset here.