NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder Extended (APP-X) Cryosphere, Version 1 (Version Superseded)

Extended AVHRR Polar Pathfinder (APP-x)

APP-x broadband surface albedo

*Note: This dataset version has been superseded by a newer version.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.* NOAA Climate Data Record (CDR) of the extended AVHRR Polar Pathfinder (APP-x) cryosphere contains 19 geophysical variables over the Arctic and Antarctic for the period 1982 - present. All of them have undergone various degrees of validation, though not all are considered CDR quality. The variables are (those considered by the developers to be CDR-quality are identified with an asterisk): Surface temperature, all-sky, snow, ice, and land* Surface albedo, all-sky* Sea ice thickness* Surface type Cloud mask* Cloud particle thermodynamic phase Cloud optical depth Cloud particle effective radius Cloud temperature Cloud pressure Cloud type Downwelling shortwave radiation at the surface* Downwelling longwave radiation at the surface* Upwelling shortwave radiation at the surface* Upwelling longwave radiation at the surface* Upwelling shortwave radiation at the TOA* Upwelling longwave radiation at the TOA* Shortwave cloud radiative forcing at the surface Longwave cloud radiative forcing at the surface APP-x data products are mapped to a 25 km EASE grid at two local solar times: 04:00 and 14:00 for the Arctic, and 02:00 and 14:00 for the Antarctica. Using local solar time rather than standard UTC times provides better information on diurnal differences at all locations.

Dataset Citation

Cite as: Key, Jeffrey; Wang, Xuanji; Liu, Yinghui; and NOAA CDR Program (2014). NOAA Climate Data Record of AVHRR Polar Pathfinder Extended (APP-X), Version 1. [indicate subset used]. NOAA National Centers for Environmental Information. doi:10.7289/V5MK69W6 [access date].

Dataset Identifiers

doi:10.7289/V5MK69W6
NCEI DSI 3710_01
gov.noaa.ncdc:C00941

ISO 19115-2 Metadata

C00941

XML


Distribution Formats	XML 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).
Ordering Instructions	Contact NCEI for other distribution options and instructions.
Distributor	NOAA National Centers for Environmental Information ncei.info@noaa.gov
Dataset Point of Contact	NOAA Climate Data Record Program Office DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce +1 (828) 271-4800 app_contacts@noaa.gov


Coverage Description
Time Period	1982 to 2019 (time interval: 12-hour)
Spatial Bounding Box Coordinates	N: 90.0 S: -90.0 E: 180.0 W: -180.0
Spatial Coverage Map


General Documentation	NCEI Dataset Landing Page Landing page for the dataset.
Processing Documents	APPX Source Code 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. APP-X Processing Overview CDR Data Flow Diagram Data processing flowchart for the CDR product. Climate Algorithm Theoretical Basis Document (C-ATBD) Extended AVHRR Polar Pathfinder (APP-x) CDR Algorithm Description Algorithm Theoretical Basis Document for the CDR product.
Associated Resources	NCEI Dataset Landing Page for the Current Version NCEI Dataset Landing Page for the Current Version Landing page for the Current Version. Data Stewardship Maturity Report for NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder Extended (APP-X) Cryosphere DSMR Publication at the NOAA Institutional Repository Report documenting the Scientific Data Stewardship Maturity for this dataset. Data Stewardship Maturity Report for NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder Extended (APP-X) Cryosphere DSMR Publication at the NOAA Institutional Repository Report documenting the Scientific Data Stewardship Maturity for this dataset. Arctic Surface, Cloud, and Radiation Properties Based on the AVHRR Polar Pathfinder Dataset. Part I: Spatial and Temporal Characteristics Journal of Climate Article Article landing page. High-latitude surface temperature estimates from thermal satellite data Remote Sensing of Environment Article Article landing page. Cloud cover analysis with Arctic AVHRR, part 1: cloud detection Journal of Geophysical Research Article Article landing page. Cloud particle phase determination with the AVHRR Journal of Applied Meteorology and Climatology Article Article landing page. A thermodynamic model for estimating sea and lake ice thickness with optical satellite data Journal of Geophysical Research Article Article landing page. NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder (APP) Cryosphere, Version 1 NCEI landing page for the APP CDR Related dataset landing page.


Publication Dates	publication: 2016-02-05
Edition	Version 1.0
Data Presentation Form	Digital image
Dataset Progress Status	Complete - production of the data has been completed Historical archive - data has been stored in an offline storage facility Superseded - replaced by new
Data Update Frequency	Not planned
Purpose	This dataset provides a high quality Climate Data Record (CDR) for use in polar climate studies, climate monitoring, and model verification.
Use Limitations	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. Uncertainties in most of the retrieve parameters (e.g., surface temperature, cloud optical depth, etc.) are smallest in the presence of sunlight ("polar day") and largest during the polar winter. Cloud detection in the polar regions at night is notoriously difficult. All other retrieved parameters are in one way or another dependent upon cloud detection. See the Algorithm Theoretical Basis Document for a description of use limitations.


Dataset Citation	Cite as: Key, Jeffrey; Wang, Xuanji; Liu, Yinghui; and NOAA CDR Program (2014). NOAA Climate Data Record of AVHRR Polar Pathfinder Extended (APP-X), Version 1. [indicate subset used]. NOAA National Centers for Environmental Information. doi:10.7289/V5MK69W6 [access date].
Cited Authors	Key, Jeffery DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce Wang, Xuanji UWI-MAD/SSEC/CIMSS > Cooperative Institute for Meteorological Satellite Studies, Space Science and Engineering Center, University of Wisconsin, Madison Lui, Yinghui UWI-MAD/SSEC/CIMSS > Cooperative Institute for Meteorological Satellite Studies, Space Science and Engineering Center, University of Wisconsin, Madison NOAA CDR Program NOAA CDR Program
Originators	Key, Jeffery DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce
Collaborators	Wang, Xuanji UWI-MAD/SSEC/CIMSS > Cooperative Institute for Meteorological Satellite Studies, Space Science and Engineering Center, University of Wisconsin, Madison Lui, Yinghui UWI-MAD/SSEC/CIMSS > Cooperative Institute for Meteorological Satellite Studies, Space Science and Engineering Center, University of Wisconsin, Madison NOAA CDR Program NOAA CDR Program
Publishers	DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce


Theme keywords	Global Change Master Directory (GCMD) Science Keywords Earth Science > Cryosphere Global Climate Observing System (GCOS) Essential Climate Variables (ECVs) Oceanic - Surface - Sea Ice Atmospheric - Upper-air - Cloud Properties Terrestrial - Albedo Atmospheric - Surface - Surface Radiation Budget (including Solar Irradiance) Atmospheric - Surface - Air Temperature Oceanic - Surface - Sea-surface 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/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce
Platform keywords	Global Change Master Directory (GCMD) Platform Keywords NOAA POES > NOAA Polar Orbiting Environmental Satellites
Instrument keywords	Global Change Master Directory (GCMD) Instrument Keywords AVHRR > Advanced Very High Resolution Radiometer
Place keywords	Global Change Master Directory (GCMD) Location Keywords Geographic Region > Arctic Continent > Antarctica
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
Stratum keywords	Global Change Master Directory (GCMD) Location Keywords Vertical Location > Land Surface Vertical Location > Sea Surface


Use Constraints	Cite as: Key, Jeffrey; Wang, Xuanji; Liu, Yinghui; and NOAA CDR Program (2014). NOAA Climate Data Record of AVHRR Polar Pathfinder Extended (APP-X), Version 1. [indicate subset used]. NOAA National Centers for Environmental Information. doi:10.7289/V5MK69W6 [access date]. 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 custom orders, data certifications, copies of analog materials, and data distribution on physical media.

Use Constraints

Cite as: Key, Jeffrey; Wang, Xuanji; Liu, Yinghui; and NOAA CDR Program (2014). NOAA Climate Data Record of AVHRR Polar Pathfinder Extended (APP-X), Version 1. [indicate subset used]. NOAA National Centers for Environmental Information. doi:10.7289/V5MK69W6 [access date].

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 custom orders, data certifications, copies of analog materials, and data distribution on physical media.

Lineage information for: dataset
Lineage Statement	This Climate Data Record (CDR) were produced by NOAA Center for Satellite Applications and Research (STAR) and University of Wisconsin and are archived at the NOAA National Climatic Data Center (NCDC).
Processor	DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce
Processing Steps	For a complete description of the processing steps, see the Algorithm Theoretical Basis Document and Data Flow Diagram.
Processing Documents	APPX Source Code 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. APP-X Processing Overview CDR Data Flow Diagram Data processing flowchart for the CDR product. Climate Algorithm Theoretical Basis Document (C-ATBD) Extended AVHRR Polar Pathfinder (APP-x) CDR Algorithm Description Algorithm Theoretical Basis Document for the CDR product.
Source Datasets	NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder (APP) Climate Data Record (CDR) NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder (APP) Climate Data Record (CDR) Landing page for APP CDR input Description of Source: AVHRR Polar Pathfinder (APP) Temporal extent used: 1982 to 2019 Spatial extent used: N:90 S:-90 E:180 W: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: 2023-09-19

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