NOAA Climate Data Record (CDR) of AMSU-A Level 1c Brightness Temperature, Version 1.0

AMSU Brightness Temperature - NOAA

browse graphicAn orbit of AMSU-A Level 1c brightness temperature data from NOAA-18.
This dataset contains Level 1c inter-calibrated brightness temperatures from the Advanced Microwave Sounding Unit-A (AMSU-A) sensors onboard six polar orbiting satellites (NOAA-15, -16, -17, -18, EUMETSAT MetOp-A, and NASA Aqua) spanning from 1998 to the present. The dataset was produced by the NOAA Center for Satellite Applications and Research (STAR), and is a Fundamental Climate Data Record (FCDR) of microwave brightness temperature in the NOAA CDR Program. AMSU-A is a 15-channel microwave radiometer with a ground spatial resolution of about 50 km in diameter at nadir. The native AMSU-A Level 1b data were inter-calibrated using the Integrated Microwave Inter-Calibration Approach (IMICA) method to obtain a long-term data product to be used in climate analyses. For comparison, data files also include the operational data used in NWP forecasting along with the IMICA calibrated radiances, which minimize or remove the biases found in the operational calibration. In addition, limb adjusted radiances for both the IMICA and operational calibrations are included for certain type of climate applications, such as atmospheric layer temperature development using the radiance datasets. The orbital swath data files include AMSU-A channels 4 through 14 (between 52.8 and 57.6 GHz) for both the IMICA calibration and the operational calibration. The inter-calibrated AMSU-A data may be updated as the sounding units are further calibrated over time.

In early 2017, a gridded version of the dataset was made available to the public. There are three types of gridding approaches: brightness temperatures of near-nadir Field of View (FOV) only, brightness temperature of FOV with minimum viewing zenith angle, and average brightness temperatures of FOVs from multiple scan positions.The gridded data are the produced using the same methodologies as the swath data, but are calculated to a 1x1 degree grid resolution with global coverage.
  • Cite dataset when used as a source: Zou, Cheng-Zhi; Wang, Wenhui; and NOAA CDR Program (2013): NOAA Fundamental Climate Data Record (FCDR) of AMSU-A Level 1c Brightness Temperature, Version 1.0. [indicate subset used]. NOAA National Climatic Data Center. doi:10.7289/V5X63JT2 [access date].
Search Data
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
zou_amsu_contacts@noaa.gov
Coverage Description
Time Period 1998-10-26 to Present (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
  • Source Code Package for AMSU Brightness Temperature - NOAA CDR
    • CDR Source Code (download)
      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.
  • AMSU-A FCDR Generation Flow Chart
  • Climate Algorithm Theoretical Basis Document for AMSU Radiance Fundamental Climate Data Record Derived from Integrated Microwave Inter-Calibration Approach
Associated Resources
Publication Dates
  • publication: 2013-08-01
  • publication: 2017-02-15
Edition Version 1.0
Data Presentation Form Digital image
Dataset Progress Status Ongoing - data is continually being updated
Data Update Frequency Monthly
Purpose This dataset provides advanced scientific researchers a high quality Climate Data Record (CDR) of Upper Atmospheric Layer Temperatures--a high quality Fundamental Climate Data Record of microwave brightness temperature for use in long-term climate analyses.
Use Limitations
  • See the Algorithm Theoretical Basis Document for a description of the use limitations for this dataset.
Dataset Citation
  • Cite dataset when used as a source: Zou, Cheng-Zhi; Wang, Wenhui; and NOAA CDR Program (2013): NOAA Fundamental Climate Data Record (FCDR) of AMSU-A Level 1c Brightness Temperature, Version 1.0. [indicate subset used]. NOAA National Climatic Data Center. doi:10.7289/V5X63JT2 [access date].
Cited Authors
  • Zou, Cheng-Zhi
    NOAA Center for Satellite Applications and Research (STAR)
  • Wang, Wenhui
    NOAA Center for Satellite Applications and Research (STAR)
  • NOAA CDR Program
    NOAA National Climatic Data Center (NCDC)
Principal Investigators
  • Zou, Cheng-Zhi
    NOAA Center for Satellite Applications and Research (STAR)
Collaborators
  • Wang, Wenhui
    NOAA Center for Satellite Applications and Research (STAR)
  • NOAA CDR Program
    NOAA National Climatic Data Center (NCDC)
Publishers
  • NOAA National Centers for Environmental Information
  • DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
Theme keywords Global Change Master Directory (GCMD) Science Keywords
  • Earth Science > Spectral/engineering > Microwave > Brightness Temperature
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
  • DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce
Platform keywords Global Change Master Directory (GCMD) Platform Keywords
  • NOAA-15 > National Oceanic & Atmospheric Administration-15
  • NOAA-16 > National Oceanic & Atmospheric Administration-16
  • NOAA-18 > National Oceanic & Atmospheric Administration-18
  • METOP-A > Meteorological Operational Satellite - A
  • AQUA > Earth Observing System, AQUA
Instrument keywords Global Change Master Directory (GCMD) Instrument Keywords
  • AMSU-A > Advanced Microwave Sounding Unit-A
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) 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
  • 50 km - < 100 km or approximately .5 degree - < 1 degree
Use Constraints
  • Cite dataset when used as a source: Zou, Cheng-Zhi; Wang, Wenhui; and NOAA CDR Program (2013): NOAA Fundamental Climate Data Record (FCDR) of AMSU-A Level 1c Brightness Temperature, Version 1.0. [indicate subset used]. NOAA National Climatic Data Center. doi:10.7289/V5X63JT2 [access date].
  • See the Use Agreement for this CDR available on the CDR page.
  • NCEI cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NCEI makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. 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 NOAA STAR and are archived at NOAA National Centers for Environmental Information (NCEI).
Processor
  • DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Processing Steps
  • The AMSU-A FCDR algorithm was implemented at the orbital-level, with one inter-calibrated Level 1c file corresponding to one AMSU-A Level 1b input file. In an orbit, Earth view raw counts data are converted to radiances scan-line by scan-line. Limb-corrected radiances are also generated to adjust off-nadir observations to nadir equivalent observations.
  • 2017-02-15T00:00:00 - Gridded version of dataset was released to the public
Processing Documents
    • Source Code Package for AMSU Brightness Temperature - NOAA CDR
      • CDR Source Code (download)
        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.
    • Climate Algorithm Theoretical Basis Document for AMSU Radiance Fundamental Climate Data Record Derived from Integrated Microwave Inter-Calibration Approach
Source Datasets
  • NOAA AMSU-A Level 1b dataset
    • NOAA TIROS Operational Vertical Sounder (TOVS) Level 1b Data
      NOAA Comprehensive Large Array-data Stewardship System (CLASS) Online Data Search and Order
    • Description of Source: NOAA Advanced Microwave Sounding Unit-A (AMSU-A) Level 1b orbital data.
    • Temporal extent used: 1998-10-26 to Present
    • Spatial extent used: N:90.0 S:-90.0 E:180.0 W:-180.0
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: 2018-05-04
For questions about the information on this page, please email: ncei.orders@noaa.gov