Global Change Master Directory (GCMD)

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TOVS GLA 5 DAY GRIDS from NOAA-11 V01 (TOVSA5NH) at GES DISC

Entry ID: TOVSA5NH_01

Summary

Abstract: This dataset (TOVSA5NH) contains the TIROS Operational Vertical Sounder (TOVS) level 3 geophysical parameters derived using data from NOAA-11 and the physical retrieval method of Susskind et al. (1984) and processed by the Satellite Data Utilization Office of the Goddard Laboratory for Atmospheres at NASA/GSFC. This method, which is hydrodynamic model- and a priori data-dependent, is designated as ... the so-called Path A scheme by the TOVS Pathfinder Science Working Group. The 20 channel High resolution Infrared Radiation Sounder 2 (HIRS2) and the 4 channel Microwave Sounding Unit (MSU) aboard the NOAA-xx series of Polar Orbiting Satellites are used to produce global fields of the 3-dimensional temperature-moisture structure of the atmosphere. In addition to profiles of temperature and moisture, the HIRS2/MSU data are used to derive important quantities such as land and sea surface temperature, outgoing longwave radiation, cloud fraction, cloudtop height, total ozone overburden and precipitation estimates.

The Path A system steps through an interactive forecast-retrieval-analysis cycle. In each 6 hour synoptic period, a 2nd order General Circulation Model (Takacs et al., 1994) is used to generate the 6 hour forecast fields of temperature and humidity. These global fields are used as the first guess for all soundings occuring within a 6 hour time window centered upon the forecast time. These retrievals are then assimilated with all available insitu measurements (such as radiosonde and ship reports) in the 6 hour interval using an Optimal Interpolation (OI) analysis scheme developed by the Data Assimilation Office of the Goddard Laboratory for Atmospheres. This analysis is then used to specify the initial conditions for the next 6 hour forecast, thus completing the cycle.

The retrieval algorithm itself is a physical method based on the iterative relaxation technique originally proposed by Chahine (1968). The basic approach consists of modifying the temperature profile from the previous iteration by an amount proportional to the difference between the observed brightness temperatures and the brightness temperatures computed from the trial parameters using the full radiative transfer equation applied at the observed satellite zenith angle. For the case of the temperature profile, the updated layer mean temperatures are given as a linear combination of multichannel brightness temperature differences with the coefficients given by the channel weighting functions. Constraints are imposed upon the solution in order to ensure stability and convergence of the iterative process. For more details see Susskind et al (1984).

There are level 3 data product files for five TOVS satellites, each of which is in the HDF format and each representative of a different averaging time period. All files contain the same number of geophysical parameter arrays stored as HDF Scientific Data Sets (SDSs). The time periods include daily, 5 day (pentad) and monthly, with the AM and PM portions of the orbits treated separately. All data are mapped to a 1 degree longitude by 1 degree latitude global grid. This collection contain 5-day averages.

Related URL

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Description: TOVSA5NH image

Geographic Coverage

Spatial coordinates

N: 90.0

S: -90.0

E: 180.0

W: -180.0

Data Set Citation

Dataset Originator/Creator: Goddard Laboratory for Atmospheres at NASA/GSFC

Dataset Title: TOVS GLA 5 DAY GRIDS from NOAA-11 V01

Dataset Series Name: TOVSA5NH

Dataset Release Date: 1995-01-01T00:00:00.000Z

Dataset Release Place: Greenbelt, MD, USA

Dataset Publisher: Goddard Earth Sciences Data and Information Services Center (GES DISC)

Version: 01

Data Presentation Form: Digital Science Data

Online Resource: https://disc.gsfc.nasa.gov/datacollection/TOVSA5NH_01.html

Temporal Coverage

Start Date: 1988-10-12

Stop Date: 1994-06-30

Location Keywords

GEOGRAPHIC REGION > GLOBAL

Science Keywords

ATMOSPHERE > ATMOSPHERIC CHEMISTRY > OXYGEN COMPOUNDS > OZONE

ATMOSPHERE > ATMOSPHERIC PRESSURE > ATMOSPHERIC PRESSURE MEASUREMENTS

Platform

NOAA-11 > National Oceanic & Atmospheric Administration-11

Instrument

HIRS/2 > High Resolution Infrared Radiation Sounder/2

MSU > Microwave Sounding Unit

TOVS > TIROS Operational Vertical Sounder

Project

TOVS Pathfinder > TOVS Path A

CWIC > CEOS WGISS Integrated Catalog

Ancillary Keywords

5-DAY

CLIMATE CHANGE

Data Set Progress

COMPLETE

Data Center

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

Data Center URL: https://disc.gsfc.nasa.gov/

Data Center Personnel
Name: GES DISC HELP DESK SUPPORT GROUP Phone: 301-614-5224 Fax: 301-614-5268 Email: gsfc-help-disc at lists.nasa.gov Contact Address: Goddard Earth Sciences Data and Information Services Center Code 610.2 NASA Goddard Space Flight Center City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA

Distribution

Distribution Media: Online Archive

Distribution Size: 21.0 MB

Distribution Format: HDF

Personnel

JOEL SUSSKIND

Role: TECHNICAL CONTACT

Phone: 301-286-7210

Fax: 301-286-2323

Email: joel.susskind-1 at nasa.gov

Contact Address:

Goddard Space Flight Center

Mailstop 613.0

City: Greenbelt

Province or State: MD

Postal Code: 20771

Country: USA

THOMAS HEARTY

Role: METADATA AUTHOR

Phone: 301-614-6513

Email: Thomas.J.Hearty at nasa.gov

Contact Address:

Distributed Active Archive Center Global Change Data Center

Code 610.2

NASA Goddard Space Flight Center

City: Greenbelt

Province or State: MD

Postal Code: 20771

Country: USA

Publications/References

Chahine, M. T. (1968-01-01T00:00:00.000Z), Determination of the Temperature Profile in an atmosphere from its Outgoing Radiances, J. Opt. Soc. Am., 58, 1634-1637

Extended Metadata Properties

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Creation and Review Dates

DIF Creation Date: 2009-03-13

Last DIF Revision Date: 2019-01-25

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