Entry_ID: NSIDC-0027
Entry_Title: TOVS Pathfinder Path-P Daily and Monthly Polar Gridded Atmospheric Parameters
Group: Data_Set_Citation
   Dataset_Creator: Francis, J. A. and A. J. Schweiger. 
   Dataset_Title: TOVS Pathfinder Path-P Daily and Monthly Polar Gridded Atmospheric Parameters
   Dataset_Release_Date: 1999-09-01updated 2008
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC DAAC: NASA DAAC at the National Snow and Ice Data Center
   Online_Resource: http://nsidc.org/data/nsidc-0027.html
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Jennifer
   Middle_Name: A.
   Last_Name: Francis
   Email: francis@apl.washington.edu
   Phone: 1 206 543-1254 
   Fax: 1 206  543-3521 
   Group: Contact_Address
      Address: Institute of Marine and Coastal Sciences
      Address: Rutgers University
      Address: New Brunswick, New Jersey
      Address: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Jennifer
   Middle_Name: A.
   Last_Name: Francis
   Email: francis@apl.washington.edu
   Phone: 1 206 543-1254 
   Fax: 1 206  543-3521 
   Group: Contact_Address
      Address: Institute of Marine and Coastal Sciences
      Address: Rutgers University
      Address: New Brunswick, New Jersey
      Address: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Axel
   Middle_Name: J.
   Last_Name: Schweiger
   Email: axel@apl.washington.edu
   Phone: 1 206 543-1312 
   Fax: 1 206  543-3521 
   Group: Contact_Address
      Address: Applied Physics Laboratory
      Address: University of Washington
      Address: 1013 NE 40th Street
      City: Seattle
      Province_or_State: WA
      Postal_Code: 98105-6698
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Axel
   Middle_Name: J.
   Last_Name: Schweiger
   Email: axel@apl.washington.edu
   Phone: 1 206 543-1312 
   Fax: 1 206  543-3521 
   Group: Contact_Address
      Address: Applied Physics Laboratory
      Address: University of Washington
      Address: 1013 NE 40th Street
      City: Seattle
      Province_or_State: WA
      Postal_Code: 98105-6698
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Technical Contact
   First_Name: NSIDC
   Last_Name: User Services
   Email: nsidc@nsidc.org
   Phone: 1 303 492-6199 x
   Fax: 1 303  492-2468 x
   Group: Contact_Address
      Address: National Snow and Ice Data Center
      Address: CIRES, 449 UCB
      Address: University of Colorado
      City: Boulder
      Province_or_State: CO
      Postal_Code: 80309-0449
      Country: USA
   End_Group
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Atmospheric Radiation
   Variable_Level_1: Emissivity
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Atmospheric Radiation
   Variable_Level_1: Emissivity
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Atmospheric Temperature
   Variable_Level_1: Air Temperature
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Atmospheric Temperature
   Variable_Level_1: Air Temperature
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Atmospheric Temperature
   Variable_Level_1: Skin Temperature
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Atmospheric Temperature
   Variable_Level_1: Skin Temperature
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Atmospheric Temperature
   Variable_Level_1: Surface Air Temperature
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Atmospheric Temperature
   Variable_Level_1: Surface Air Temperature
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Atmospheric Water Vapor
   Variable_Level_1: Precipitable Water
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Atmospheric Water Vapor
   Variable_Level_1: Precipitable Water
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Atmospheric Winds
   Variable_Level_1: Wind Stress
   Detailed_Variable: Geostrophic Drag Coefficient
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Atmospheric Winds
   Variable_Level_1: Wind Stress
   Detailed_Variable: Geostrophic Drag Coefficient
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Clouds
   Variable_Level_1: Cloud Amount/Frequency
   Detailed_Variable: Effective Cloud Fraction
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Clouds
   Variable_Level_1: Cloud Amount/Frequency
   Detailed_Variable: Effective Cloud Fraction
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Clouds
   Variable_Level_1: Cloud Top Pressure
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Clouds
   Variable_Level_1: Cloud Top Pressure
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Clouds
   Variable_Level_1: Cloud Top Temperature
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Clouds
   Variable_Level_1: Cloud Top Temperature
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Ocean Winds
   Variable_Level_1: Wind Stress
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Ocean Winds
   Variable_Level_1: Wind Stress
End_Group
ISO_Topic_Category: Climatology/Meteorology/Atmosphere
Keyword: Atmospheric Stratification
Keyword: Boundary Layer
Keyword: Boundary Layer Stratification
Keyword: Cloud Fraction
Keyword: Cloud Properties
Keyword: Cloud Top Pressure
Keyword: Cloud Tops
Keyword: Cloud Top Temperature
Keyword: DAAC
Keyword: EOSDIS
Keyword: Geostrophic Drag Coefficient
Keyword: Geostrophic Wind
Keyword: Humidity Profiles
Keyword: Ice
Keyword: ICE SURFACE SKIN TEMPERATURE
Keyword: INITIALIZATION INVERSION ALGTHM
Keyword: NOAA/NASA Pathfinder
Keyword: North Polar Basin
Keyword: NSIDC DAAC
Keyword: Ocean Surface Skin Temperature
Keyword: Path P
Keyword: Polar Exchange At Sea Surface
Keyword: Poles
Keyword: SNOW ICE
Keyword: Temperature Profiles
Keyword: TOVS
Keyword: Turning Angle
Sensor_Name: HIRS > High Resolution Infrared Radiation Sounder
Sensor_Name: MSU > Microwave Sounding Unit
Sensor_Name: SOUNDERS
Sensor_Name: TOVS > TIROS Operational Vertical Sounder
Source_Name: NOAA-10 > National Oceanic & Atmospheric Administration-10
Source_Name: NOAA-11 > National Oceanic & Atmospheric Administration-11
Source_Name: NOAA-12 > National Oceanic & Atmospheric Administration-12
Source_Name: NOAA-13 > National Oceanic & Atmospheric Administration-13
Source_Name: NOAA-14 > National Oceanic & Atmospheric Administration-14
Source_Name: NOAA-6 > National Oceanic & Atmospheric Administration-6
Source_Name: NOAA-7 > National Oceanic & Atmospheric Administration-7
Source_Name: NOAA-8 > National Oceanic & Atmospheric Administration-8
Source_Name: NOAA-9 > National Oceanic & Atmospheric Administration-9
Group: Temporal_Coverage
   Start_Date: 1979-07-12
End_Group
Group: Temporal_Coverage
   Start_Date: 1979-01-01
End_Group
Data_Set_Progress: in work
Group: Spatial_Coverage
   Southernmost_Latitude: -90
   Northernmost_Latitude: -60
   Westernmost_Longitude: -180
   Easternmost_Longitude: 180
End_Group
Group: Spatial_Coverage
   Southernmost_Latitude: 60
   Northernmost_Latitude: 90
   Westernmost_Longitude: -180
   Easternmost_Longitude: 180
End_Group
Group: Location
   Location_Category: GEOGRAPHIC REGION
   Location_Type: NORTHERN HEMISPHERE
End_Group
Group: Location
   Location_Category: GEOGRAPHIC REGION
   Location_Type: SOUTHERN HEMISPHERE
End_Group
Group: Data_Resolution
   Latitude_Resolution: 100 km
   Longitude_Resolution: 100 km
End_Group
Project: CEAREX > Coordinated Eastern Arctic Experiment
Project: EOSDIS > Earth Observing System Data Information System
Project: ESIP > Earth Science Information Partners Program
Project: NOAA/NASA PATHFINDER > NOAA/NASA Pathfinder Program
Group: Quality

   The algorithm used to generate these grids has been validated directly through 
   comparisons with surface observations from the CEAREX experiment and with 
   radiosonde data from Soviet ice stations. Comparisons with other TOVS 
   retrieval algorithms provided further validation. Additionally, Schweiger et 
   al. (1999) found a strong correlation between the TOVS Path-P data and surface 
   cloud observations obtained from the North Polar drifting meteorological 
   stations, which indicates that the TOVS data effectively represent annual 
   cloud cover.

End_Group
Group: Access_Constraints

   Users are strongly encouraged to register before accessing data. Registered 
   users automatically receive release notes via e-mail containing notification 
   of data manipulation or formatting modifications.

End_Group
Data_Set_Language: English
Group: Data_Center
   Data_Center_Name: NASA DAAC > NASA DAAC at the National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org/daac/index.html
   Group: Personnel
      Role: Data Center Contact
      First_Name: NSIDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 
      Fax: 1 303  492-2468 
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Data_Center
   Data_Center_Name: NSIDC > National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org
   Group: Personnel
      Role: Data Center Contact
      First_Name: NSIDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 
      Fax: 1 303  492-2468 
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Distribution
   Distribution_Media: FTP
   Distribution_Size: 494.5 - 760.6 MB
   Distribution_Format: HDF
End_Group
Group: Reference

   Armstrong, R. L. and M. J. Brodzik. 1995. An Earth-gridded SSM/I Data Set for 
   Cryospheric Studies and Global Change Monitoring. Advances in Space Research 
   16:155-63.

   Brodzik, M. J. 1998. The EASE-Grid, A Versatile Set of Equal-Area Projections 
   and Grids. Special report to the National Snow and Ice Data Center, Boulder, 
   Colorado USA.

   Brodzik, M. J. 1998. Summary of NOAA/NASA Polar Pathfinder Grid Relationships. 
   Special report to the National Snow and Ice Data Center, Boulder, Colorado USA.

   Chedin, A., N. A. Scott, C. Wahiche, P. Moulineier. 1985. The Improved 
   Initialization Inversion Method: A high Resolution Physical Method for 
   Temperature Retrievals from Satellites of the TIROS-N Series. Journal of 
   Climate and Applied Meteorology pp. 62-65.  

   Chiaachio, M., J. Francis, and P. W. Stackhouse, Jr. 1998. Evaluation and 
   Development of Nighttime Arctic Cloud Base Algorithms for CERES. American 
   Meteorological Society 5th Conference on Polar Meteorology and Oceans. pp. 
   300-05.

   Francis, J., A. Munchow, and R. Cermak. 1998. Analyses of Long-term 10-meter 
   Winds over the Arctic Basin. American Meteorological Society 5th Conference on 
   Polar Meteorology and Oceans. pp. 66-68.

   Francis, J. and A. Schweiger. 1999. A New Window to the Arctic. Journal of 
   Climate 12(8) (August): 2189-2213, Part I.

   Francis, J. A. 1994. Improvements to TOVS Retrievals over Sea Ice and 
   Applications to Estimating Arctic Energy Fluxes. Journal of Geophysical 
   Research 99(D5):10,395-408.

   Francis, J. and A. Schweiger. 1998. The NASA/NOAA TOVS Polar Pathfinder: 18 
   Years of Arctic data. American Meteorological Society 5th Conference on Polar 
   Meteorology and Oceans. 24:128-43.

   Francis, J. A. 1994. Improvements to TOVS Retrievals over Sea Ice and 
   Applications to Estimating Arctic Energy Fluxes. Journal of Geophysical 
   Research 99(D5):10,395-408.

   Goddard Space Flight Center. 1994. EOSDIS Version 0 Data Product 
   Implementation Guidelines. Draft Version 1.0 (March 1, 1994). GSFC 50-003-04. 
   GSFC. Greenbelt, MD.

   Groves, D. G. 1998. A New Moisture Budget of the Arctic Atmosphere Derived 
   from 19 Years of Daily TOVS Satellite Moisture Retrievals and NCEP Reanalysis 
   Winds. American Meteorological Society 5th Conference on Polar Meteorology and 
   Oceans. pp. 107-12.

   Groves, D. G. 1998. Temporal Variability of Arctic Atmospheric Moisture Budget 
   Quantities Derived from Daily TOVS Satellite Moisture Retrievals and NCEP 
   Reanalysis Winds. American Meteorological Society 5th Conference on Polar 
   Meteorology and Oceans. pp. 380-82.

   Key, J., D. Slayback, C. Xu, and A. Schweiger. 1998. New Climatologies of 
   Polar Clouds and Radiation Based on the ISCCP 'D' Products. American 
   Meteorological Society 5th Conference on Polar Meteorology and Oceans. pp. 
   227-32.

   National Center for Supercomputing Applications. 1994. HDF Reference Manual. 
   Version 3.3. University of Illinois at Urbana-Champaign.  

   National Oceanic and Atmospheric Administration. 1991. NOAA Polar Orbiter Data 
   Users Guide. Washington, D.C.: National Environmental Satellite, Data and 
   Information Service, National Climatic Data Center Satellite Data Services 
   Division.

   Overland, J. E., and R. L. Colony. 1994. Geostrophic Drag Coefficients over 
   the Central Arctic Derived from Soviet Drifting Station Data. Tellus. 
   46(A):75-85.

   Overland, J. E., and K. L. Davidson. 1992. Geostrophic Drag Coefficients over 
   Sea Ice. Tellus. 44(A):54-66.

   Schweiger, A. J., R. W. Lindsay, J. R. Key, and J. A. Francis. 1999. Arctic 
   Clouds in Multiyear Satellite Data Sets. Geophysical Research Letters 
   26(13):1,845-48. Document is also available online at 
   http://www.agu.org/GRL/articles/1999GL900479/GL841W01.pdf .

   Schweiger A., C. Fowler, J. Key, J. Maslanik, J. Francis, R. Armstrong, M. J. 
   Brodzik, T. Scambos, T. Haran, M. Ortmeyer, S. Khalsa, D. Rothrock, R. Weaver. 
   1998. P-Cube: A Multi-sensor Data Set for Polar Climate Research. American 
   Meteorological Society 5th Conference on Polar Meteorology and Oceans. pp. 
   136-141.

   Schweiger, A., Francis, J. 1994. TOVS Pathfinder Path-P Gridded Daily and 
   Monthly Arctic Atmospheric Data from TOVS User's Guide. Draft version 0.1. 
   University of Washington, Seattle.

   Schweiger, A. J., R. W. Lindsay, J. A. Francis, J. R. Key, J. Intrieri, M. 
   Shupe. Validation of TOVS Path-P Data During SHEBA. Submitted to Journal of 
   Geophysical Research, May 2000. 
   (http://psc.apl.washington.edu/pathp/html/publications/papers_list.html#S2000)  

   Stubenrauch, C. J, W. B. Rossow, F. Cheruy, A. Chedin and N. A. Scott. 1999. 
   Clouds as Seen by Satellite Sounders (3) and Imagers (ISCCP), Part I. 
   Evaluation of Cloud Parameters. Journal of Climate 12 (8) (August): 2189-2213.

End_Group
Group: Summary

   The TIROS-N Operational Vertical Sounder (TOVS) Polar Pathfinder (Path-P) data 
   set consists of gridded daily and monthly Arctic and Antarctic atmospheric 
   data derived from various NOAA satellites. TOVS Path-P daily files are 
   available for the Northern and Southern Hemispheres from 60 degrees poleward 
   at 100 km gridded spatial resolution in an Equal-Area Scalable Earth Grid 
   (EASE-Grid). TOVS Path-P monthly files are available for the Northern 
   Hemisphere only from 60 degrees poleward at 100 km gridded spatial resolution 
   in EASE-Grid. Daily and monthly Northern Hemisphere data are available from 
   January 1979 through current processing, and daily Southern Hemisphere data 
   are available from July 1979 through current processing. Data were created 
   from a modified version of the Improved Initialization Inversion Algorithm 
   (3I) (Chedin et al. 1985), a physical-statistical retrieval method improved 
   for use in identifying geophysical variables in snow- and ice-covered areas 
   (Francis 1994).

   Variables retrieved from satellite-observed radiances for this product include 
   atmospheric temperature, water vapor, skin surface temperature, total 
   effective cloud fraction, cloud top pressure and temperature, solar zenith 
   elevation, surface pressure, turning angle between geostrophic wind and 
   surface stress over ice, emissivity, boundary layer stratification, and 
   geostrophic drag coefficient. The algorithm used to generate these grids has 
   been validated through comparisons with surface observations from the North 
   Pole drifting meteorological stations (Schweiger et al. 1999).

   The complete TOVS data set is available via FTP in Hierarchical Data Format 
   (HDF). Users may also order subsets of the data for any of the parameters 
   listed above or for specific spatial or temporal coverage. 

   Data users are encouraged to register before accessing the TOVS data. 
   Registered users automatically receive release notes via e-mail containing 
   notification of data manipulation or formatting modifications.

End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://nsidc.org/daac/pathfinder/index.html
   Description: DAAC Data: The NOAA/NASA Polar Pathfinder Program
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW RELATED INFORMATION
   End_Group
   URL: http://nsidc.org/data/ease/
   Description: EASE-Grid Data
End_Group
IDN_Node: USA/NASA
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 1999-09-01
Last_DIF_Revision_Date: 2014-03-11
DIF_Revision_History: Removed two broken links from the See Also section.