AIRS2RET_NRT_006

AIRS/Aqua L2 Near Real Time (NRT) Standard Physical Retrieval (AIRS-only) V006 (AIRS2RET_NRT) at GES DISC

Version 006 eng NRT
  • Abstract
    The Atmospheric Infrared Sounder (AIRS) Level 2 Near Real Time (NRT) Standard Physical Retrieval (AIRS-only) product (AIRS2RET_NRT_006) differs from the routine product (AIRS2RET_006) in four ways to meet the three hour latency requirements of the Land Atmosphere NRT Capability Earth Observing System (LANCE): (1) The NRT granules are produced without previous or subsequent granules if those granules are not available within 5 minutes, (2) the predictive ephemeris/attitude data are used rather than the definitive ephemeris/attitude, (3) if the forecast surface pressure is unavailable, a surface climatology is used, and (4) no ice cloud properties retrievals are performed. The consequences of these differences are described in the AIRS Near Real Time (NRT) data products document. The Atmospheric Infrared Sounder (AIRS) is a grating spectrometer (R = 1200) aboard the second Earth Observing System (EOS) polar-orbiting platform, EOS Aqua. In combination with the Advanced Microwave Sounding Unit (AMSU) and the Humidity Sounder for Brazil (HSB), AIRS constitutes an innovative atmospheric sounding group of visible, infrared, and microwave sensors. This product is produced using AIRS IR only because the radiometric noise in AMSU channel 4 started to increase significantly (since June 2007). The AIRS Standard Retrieval Product consists of retrieved estimates of cloud and surface properties, plus profiles of retrieved temperature, water vapor, ozone, carbon monoxide and methane. Estimates of the errors associated with these quantities is also part of the Standard Product. The temperature profile vertical resolution is 28 levels total between 1100 mb and 0.1 mb, while moisture profile is reported at 14 atmospheric layers between 1100 mb and 50 mb. The horizontal resolution is 50 km. An AIRS granule has been set as 6 minutes of data, 30 footprints cross track by 45 lines along track.
  • Purpose
    The Near Real Time (NRT) product is for users whose primary interest is the low latency for data availability. While standard data products are available within 3 days of observation, NRT data are usually available within 3 hours of observation.

Data Identification Fields:

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    Data Dates
    Creation
    Last Revision
    Processing Level

    2

    Quality
    The product is similar to AIRX2RET except the processing uses only the AIRS channels. No AMSU information was used in the generation of this product. As a Near Real Time (NRT) product this differs from AIRS2RET.006 AIRS-only in four ways to meet the three hour latency requirement of the Land Atmosphere NRT Capability Earth Observing System (LANCE). For additional information about NRT processing see either the Related URL section or the Publication References section for the V6 NRT memo. The quality of data products, described in the associated references, provide information about numerous validation studies conducted and papers written documenting the excellence of the products using radiosondes, ground truth, other satellites, and model analysis products. There are however several limitation of the AIRS-only Version-6 retrieval products. The AIRS-only surface classification determination is not optimal in polar regions. In addition, the Version-6 retrievals contain a spurious dry daytime moisture bias. Another is the thickness of the AIRS atmospheric temperature layer structure near the surface is not sensitive enough for the determination of a consistently accurate boundary layer. For trace gases, the total column CO and total column methane (CH4) are dominated by the initial guess and should not be used for research purposes. In addition, the AIRS retrieval is not sensitive to either constituent near the surface. Also, the total column ozone is good, but the shape of the profile can be incorrect in regions of temperature inversion. Occasionally in the tropical ocean the algorithm confuses silicates from dust storms blowing off the African continent toward the Americas for high levels of ozone. Each variable contains a flag indicating the quality of the value. The three options for this quality flag are: 0 for best quality, 1 for good quality, 2 for do not use.
    Collection Progress

    Active

    Access Constraints

    You must register using the EOSDIS User Registration System in order to access LANCE NRT AIRS data. You can register at https://urs.eosdis.nasa.gov/users/new

    Publication References
    • The Atmospheric Infrared Sounder version 6 cloud products
      2014-01-01

      Author(s) B. H. Kahn et al.

      Pages: 399-426

      DOI: 10.5194/acp-14-399-2014

    • Improved methodology for surface and atmospheric soundings, error estimates, and quality control procedures: the atmospheric infrared sounder science team version-6 retrieval algorithm
      2014-03-31

      Author(s) Joel Susskind, John, M. Blaisdell, and Lena Iredell

      Edition: 8

      Vol: 1

      Pages: 34

      DOI: 10.1117/1.JRS.8.084994

    • Validation of AIRS version 6 temperature profiles and surface-based inversions over Antarctica using Concordiasi dropsonde data
      2015-02-10

      Author(s) Patrick Boylan, Junhong Wang, Stephen A. Cohn, Erik Fetzer, Eric S. Maddy, and Sung Wong

      Journal of Geophysical Research: Atmospheres

      Vol: 120

      Iss: 3

      Pages: 992-1007

      DOI: 10.1002/2014JD022551

    • Verificaton of air/surface humidity differences from AIRS and ERA-Interim in support of turbulent flux estimation in the Arctic
      2015-01-15

      Author(s) L.N. Boisvert, D.L. Wu, T. Vihma, J.Susskind

      Journal of Geophysical Research, Atmospheres

      Vol: 120

      Iss: 3

      Pages: 945-963

      DOI: 10.1002/2014JD02166

    • A global assessment of NASA AIRS v6 and EUMETSAT IASI v6 precipitable water vapor using ground‐based GPS SuomiNet stations
      2016-07-21

      Author(s) Jacola Roman, Robert Knuteson, Thomas August, Tim Hultberg, Steve Ackerman, and Hank Revercomb

      Journal of Geophysical Research, Atmospheres

      Vol: 121

      Iss: 15

      Pages: 8925-8948

      DOI: 10.1002/2016JD024806

    • Neural network temperature and moisture retrieval algorithm validation for AIRS/AMSU and CrIS/ATMS
      2015-12-20

      Author(s) Adam B. Milstein, William J. Blackwell

      Journal of Geophysical Research, Atmospheres

      Vol: 121

      Iss: 4

      Pages: 1414-1430

      DOI: 10.1002/2015JD024008

    • Validation of Atmospheric Infrared Sounder Observations

      Author(s) Journal Editors

      J. Geophys, Res. Atmospheres

      Vol: 111

      Iss: 9

      DOI: 10.1029/2005/JD007020

    • Retrieval of Atmospheric and Surface Parameters From AIRS/AMSU/HSB Data in the Presence of Clouds
      2003-04-29

      Author(s) Joel Susskind, Christopher D. Barnet, and John M. Blaisdell

      EEE Transactions on Geoscience and Remote Sensing,

      Vol: 41

      Iss: 2

      Pages: 390-409

      DOI: 10.1109/TGRS.2002.808236

    • AIRS Near Real Time (NRT) data products

      Author(s) Thomas Hearty, Feng Ding, Ed Esfandiari, Andrey Savtchenko, Michael Theobald, Bruce Vollmer, Xin-Min Hua, Evan Manning, and Edward Olsen

Related URLs
    Science Keywords
    • EARTH SCIENCE
    • ATMOSPHERE
    • AIR QUALITY
    • CARBON MONOXIDE
    • EARTH SCIENCE
    • ATMOSPHERE
    • AIR QUALITY
    • TROPOSPHERIC OZONE
    • EARTH SCIENCE
    • ATMOSPHERE
    • ALTITUDE
    • GEOPOTENTIAL HEIGHT
    • EARTH SCIENCE
    • ATMOSPHERE
    • ALTITUDE
    • TROPOPAUSE
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC CHEMISTRY
    • CARBON AND HYDROCARBON COMPOUNDS
    • METHANE
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC CHEMISTRY
    • OXYGEN COMPOUNDS
    • OZONE
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC CHEMISTRY
    • SULFUR COMPOUNDS
    • SULFUR DIOXIDE
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC PRESSURE
    • SURFACE PRESSURE
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC RADIATION
    • OUTGOING LONGWAVE RADIATION
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC TEMPERATURE
    • SURFACE TEMPERATURE
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC TEMPERATURE
    • SURFACE TEMPERATURE
    • AIR TEMPERATURE
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC TEMPERATURE
    • UPPER AIR TEMPERATURE
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC WATER VAPOR
    • WATER VAPOR INDICATORS
    • HUMIDITY
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC WATER VAPOR
    • WATER VAPOR INDICATORS
    • LAYERED PRECIPITABLE WATER
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC WATER VAPOR
    • WATER VAPOR INDICATORS
    • TOTAL PRECIPITABLE WATER
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC WATER VAPOR
    • WATER VAPOR PROFILES
    • EARTH SCIENCE
    • ATMOSPHERE
    • CLOUDS
    • CLOUD MICROPHYSICS
    • CLOUD LIQUID WATER/ICE
    • EARTH SCIENCE
    • ATMOSPHERE
    • CLOUDS
    • CLOUD PROPERTIES
    • CLOUD FRACTION
    • EARTH SCIENCE
    • ATMOSPHERE
    • CLOUDS
    • CLOUD PROPERTIES
    • CLOUD HEIGHT
    • EARTH SCIENCE
    • ATMOSPHERE
    • CLOUDS
    • CLOUD PROPERTIES
    • CLOUD TOP PRESSURE
    • EARTH SCIENCE
    • ATMOSPHERE
    • CLOUDS
    • CLOUD PROPERTIES
    • CLOUD TOP TEMPERATURE
    • EARTH SCIENCE
    • ATMOSPHERE
    • CLOUDS
    • CLOUD PROPERTIES
    • CLOUD VERTICAL DISTRIBUTION
    • EARTH SCIENCE
    • LAND SURFACE
    • SURFACE RADIATIVE PROPERTIES
    • EMISSIVITY
    • EARTH SCIENCE
    • LAND SURFACE
    • SURFACE THERMAL PROPERTIES
    • SKIN TEMPERATURE
    • EARTH SCIENCE
    • OCEANS
    • OCEAN TEMPERATURE
    • SEA SURFACE TEMPERATURE
Other Descriptive Keywords
Toggle Other Descriptive Keywords Fields
Ancillary Keywords
  • ATMOSPHERE
  • CALIBRATED
  • GEOLOCATED
  • TEMPERATURE
  • CLOUD
  • EOSDIS
  • Carbon Monoxide
  • Cloud Liquid Water
  • Methane
  • Ozone
  • Spectral IR Surface Emissivities
  • TEMPERATURE
  • WATER VAPOR
  • Water Vapor Saturation Mass Mixing Ratio
  • Water Vapor Mass Mixing Ratio
  • LANCE
  • NRT
  • RELATIVE_START_DATE: -7
ISO Topic Categories
  • IMAGERY/BASE MAPS/EARTH COVER
  • CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
  • ENVIRONMENT
  • GEOSCIENTIFIC INFORMATION

Acquisition Information Fields:

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Platforms
  • Earth Observation Satellites
    Aqua
    Instruments
    • AIRS
Projects
Project Short Name Campaigns Project Dates
Aqua No campaigns listed. No dates provided.
LANCE No campaigns listed. No dates provided.

Temporal Information Fields:

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Spatial Information Fields:

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Location Keywords
    • GEOGRAPHIC REGION
    • GLOBAL

Data Centers

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  • NASA/GSFC/SED/ESD/GCDC/GESDISC
    ARCHIVER
    Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA

    This data center does not have any addresses listed.

    This data center does not have any contact mechanisms listed.

    https://disc.gsfc.nasa.gov/
    • Home Page

Data Contacts

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  • ED ESFANDIARI
    Metadata Author
    ED ESFANDIARI

    Goddard Earth Sciences Data and Information Services Center
    Code 610.2
    NASA Goddard Space Flight Center
    Greenbelt, MD 20771

    • Email
    • 301-614-5960
    • 301-614-5268
  • GES DISC HELP DESK SUPPORT GROUP
    Data Center Contact
    GES DISC HELP DESK SUPPORT GROUP

    NASA/GSFC/SED/ESD/GCDC/GESDISC

    Goddard Earth Sciences Data and Information Services Center
    Code 610.2
    NASA Goddard Space Flight Center
    Greenbelt, MD 20771

    • Email
    • 301-614-5224
    • 301-614-5268

Collection Citations Fields:

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Metadata Dates
Creation
Last Revision

Archive And Distribution Information Fields:

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    File Distribution Information
    • HDF-EOS

      Format Type: Native

      Media: Online Archive

      Average File Size: 3.9 MB

      Fees: None