NOTICE -- The LBA-ECO Project website is no longer being supported.  This archive is a snapshot, as it existed in 2013, of the LBA-ECO website, maintained by NASA Goddard Space Flight Center, and now archived at the ORNL DAAC.  Links to external websites may be inactive. Final data products from the LBA project can be found at the ORNL DAAC.
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Investigation:

CD-07 (Smith / Cooper / Dias)

LBA Dataset ID:

LBAGOES8_L3SRB

Originator(s):

1. GU, J.J.
2. SMITH, E.A.
      3. COOPER, H.J.

Point(s) of Contact:

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (ornldaac@ornl.gov)

Dataset Abstract:

High resolution downwelling solar, PAR, infrared radiation and rain rates retrieved from GOES-8 imager. The data set covers primarily Amazon watershed area. It has 8km and half hourly resolution. Data covers two periods in 1999: March 1 - April 30 and September 1 - October 31. Files are available in compressed binary format. The naming convention for the tar files is as follows. The first two digits of each
tar file name 99 is the year of the data. The last three digits of the name is
the day of the year. After untarring each file, you should see 48 compressed binary
files, such as A990600000.sat.gz. The 99 and 060 are again the year and the day of the year. The next 2 digits is the hour, followed with a 2-digit minute. The time is in UTC.

Beginning Date:

1999-03-01

Ending Date:

2005-06-29

Metadata Last Updated on:

2006-05-01

Data Status:

Archived

Access Constraints:

PUBLIC

Data Center URL:

http://daac.ornl.gov/

Distribution Contact(s):

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (ornldaac@ornl.gov)

Access Instructions:

PUBLIC

Data Access:

IMPORTANT: The LBA-ECO Project website is no longer being supported. Links to external websites may be inactive. Final data products from the LBA project can be found at the ORNL DAAC. Please follow the fair use guidelines found in the dataset documentation when using or citing LBA data.
Datafile(s):

LBA-ECO CD-07 GOES-8 L3 Gridded Surface Radiation and Rain Rate for Amazonia: 1999:  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=831

Documentation/Other Supporting Documents:

LBA-ECO CD-07 GOES-8 L3 Gridded Surface Radiation and Rain Rate for Amazonia: 1999:  http://daac.ornl.gov/LBA/guides/CD07_GOES_L3_Gridded_SRB.html

Citation Information - Other Details:

Gu J. J., E. A. Smith, and H. J. Cooper. 2005. LBA-ECO CD-07 GOES-8 L3 Gridded Surface Radiation and Rain Rate for Amazonia: 1999. Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/831

Keywords - Theme:

Parameter Topic Term Source Sensor
INCOMING SOLAR RADIATION ATMOSPHERE ATMOSPHERIC RADIATION GOES-8 GOES-8 IMAGER
LONGWAVE RADIATION ATMOSPHERE ATMOSPHERIC RADIATION GOES-8 GOES-8 IMAGER
PHOTOSYNTHETICALLY ACTIVE RADIATION BIOSPHERE VEGETATION GOES-8 GOES-8 IMAGER
PRECIPITATION RATE ATMOSPHERE PRECIPITATION GOES-8 GOES-8 IMAGER

Uncontrolled Theme Keyword(s):  SRB: SURFACE RADIATION BUDGET

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
Para Western (Santarem) Altamira 5.00000 -15.00000 -40.00000 -75.00000

Related Publication(s):

Gu, J.J., E.A. Smith, H.J. Cooper, A. Grose, G.S. Liu, J.D. Merritt, M.J. Waterloo, A.C. de Araujo, A.D. Nobre, A.O. Manzi, J. Marengo, P.J. de Oliveira, C. von Randow, J. Norman, and P.S. Dias. 2004. Modeling carbon sequestration over the large-scale Amazon basin, aided by satellite observations. Part I: Wet- and dry-season surface radiation budget flux and precipitation variability based on GOES retrievals. Journal of Applied Meteorology 43(6):870-886.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

Thirty-minute averages of surface radiation and precipitation parameters have been interpolated onto equal area grid at 8 km resolution. The parameters include:



- Down-welling solar radiation at surface

- Down-welling PAR at surface

- Down-welling Infrared radiation at surface

- Precipitation rate at surface

Data Application and Derivation:

The GOES mission is to provide the nearly continuous, repetitive observations

that are needed to predict, detect, and track severe weather. GOES spacecraft

are equipped to observe and measure cloud cover, surface conditions, snow and

ice cover, surface temperatures, and the vertical distributions of atmospheric

temperature and humidity. They are also instrumented to measure solar X-rays

and other energetics, collect and relay environmental data from platforms, and

broadcast instrument data and environmental information products to ground

stations. The GOES system includes the satellite (with the GOES instrumentation

and direct downlink data transmission capability); the National Environmental

Satellite, Data and Information Service (NESDIS) facility at Wallops Island, VA;

and the ground systems at NESDIS.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Quality Assessment



Data Validation by Source



The retrieved radiation and precipitation were validated using data collected at EUSTACH and TRMM-LBA sites near Rondonia and Belem. See Gu et al.(2002) for details.



Confidence Level/Accuracy Judgment



In comparison to the in situ measurements collected at the EUSTACH sites during

the wet and dry season 1999 on the half hourly and 8 km scales, the bias errors for solar, PAR and infrared radiation are under 4, 6, and 3% of the mean values. Precision errors are on the order of 20, 20, and 5%. The bias of rain rate is on the order of 25%. (see Gu et al. 2002 for details)

Process Description:

Data Acquisition Materials and Methods:

The data were acquired using the FSU Direct Readout Ground System located in

Tallahassee, FL, starting on 01-Mat-1998 and continuing through 28-Feb-2001. The GOES-8 satellite orbits Earth in a geostationary orbit at an altitude of 36,000 km.



The SRB and precipitation data were created from raw GOES-8 imager data.

Equipment </b>




GOES-8, launched on April 13 of 1994, is the first of NOAA\'s next generation of geostationary satellites. It is stationed at 36,000km above the equator at 75W longitude. The new series of GOES introduces improved capabilities to observe weather-related phenomena.



Sensor/Instrument Description </b>




The GOES-8 imager is an imaging radiometer designed to sense radiant and solar reflected energy from sampled areas of the earth. It has a five-band multi-spectral capability with high space/time resolution and 10-bit precision. The five spectral bands are (1) 0.52-0.72 ?m (visible), (2) 3.78-4.03 ?m (shortwave infrared window), (3) 6.47-7.02 ?m (upper-level water vapor), (4) 10.2-11.2 ?m, and (5) 11.5-12.5 ?m (thermal infrared windows). The special resolutions of the imager data are 1, 4, 8, 4, and 4 km, respectively.



The Imager consists of electronics, power supply, and sensor modules. The

sensor module containing the telescope, scan assembly, and detectors is mounted

on a base plate external to the spacecraft, together with the shields and

louvers for thermal control. The electronics module provides redundant

circuitry and performs command, control, and signal processing functions; it

also serves as a structure for mounting and interconnecting the electronic

boards for proper heat dissipation. The power supply module contains the

converters, fuses, and power control for interfacing with the spacecraft

electrical power subsystem. The electronics and power supply modules are

mounted on the spacecraft internal equipment panel.



--------------------------------------------------------------------------------

Imager Instrument Characteristics Spectral Bands (micrometers)



VIS IR2 IR3 IR4 IR5

--------------------------------------------------------------------------------

Wavelength (micrometers) 0.55 3.80 6.50 10.20 11.50

to to to to to

0.75 4.00 7.00 11.20 12.50

--------------------------------------------------------------------------------

Clouds X X X X X

--------------------------------------------------------------------------------

Water Vapor X X X

--------------------------------------------------------------------------------

Surface Temp 0 X 0

--------------------------------------------------------------------------------

Winds X X X

--------------------------------------------------------------------------------

Albedo & IR Flux X 0 X 0

--------------------------------------------------------------------------------

Fires & Smoke X X 0 0

--------------------------------------------------------------------------------

X: Primary Spectral Channel

0: Secondary (supplementary) Spectral Channel

--------------------------------------------------------------------------------

Field of View Defining Element: Detector

--------------------------------------------------------------------------------

Optical Field of View: Square

--------------------------------------------------------------------------------

5-channel Imaging: Simultaneously

--------------------------------------------------------------------------------

Scan Capability: Full Earth/Sector/Area

--------------------------------------------------------------------------------

Channel/Detector Instantaneous Field of View (IFOV)

Visible/Silicon : 1 km

Short-wave/InSb : 4 km

Moisture/HgCdTe : 8 km

Long-wave 1/HgCdTe : 4 km

Long-wave 2/HgCdTe : 4 km

--------------------------------------------------------------------------------

Radiometric Calibration: Space and 290 Kelvin IR internal blackbody

--------------------------------------------------------------------------------

Signal Quantizing (NE\'delta\'T) : 10 bits all channels

S/N : Minimum 3X better than specifications

--------------------------------------------------------------------------------

Frequency of Calibration Space : 2.2 sec for full disk;

: 9.2 or 36.6 sec for sector/area

Infrared : 30 minutes typical

--------------------------------------------------------------------------------

System Absolute Accuracy : IR channel less than 0.1 K

--------------------------------------------------------------------------------

Transmit Frequency : 1676.00 MHz



Collection Environment </b>




The data were acquired using the FSU Direct Readout Ground System located in

Tallahassee, FL, starting on 01-Mat-1998 and continuing through 28-Feb-2001. The GOES-8 satellite orbites Earth in a geostationary orbit at an altitude of 36,000 km.



Source/Platform</b>




GOES-8



Source/Platform Mission Objectives</b>




The mission of the GOES satellite series is to provide the nearly continuous

observations that are needed to predict, detect, and track severe weather. GOES

spacecraft are equipped to observe and measure cloud cover, surface conditions,

snow and ice cover, surface temperatures, and the vertical distributions of

atmospheric temperature and humidity. They are also instrumented to measure

solar X-rays and other energetics, collect and relay environmental data from

platforms, and broadcast instrument data and environmental information products

to ground stations.



For LBA GOES-8 imagery, along with the other remotely sensed images, was collected in order to provide spatially extensive information over the primary study areas at varying spatial scales. The primary objective for the GOES-8 images was to collect visible, IR, and water-vapor channel data covering the LBA region at a sufficiently high temporal frequency for subsequent use in analyzing weather events and deriving temporal surface radiation parameters and patterns.

References:

References</b>



Platform/Sensor/Instrument/Data Processing Documentation</b>



Menzel, W. P., and J. F. W. Purdom, 1994: Introducing GOES-I: The first of a new generation of geostationary operational environmental satellite. Bull. Amer. Meteor. Soc., 75, 757-781.



Kelly, K.A. 1989: GOES I-M image navigation and registration and user Earth

location. GOES I-M Operational Satellite Conf., Arlington, VA, US. Department of

Commerce, NOAA, 154-167.



Rossow, W.B., C.L. Brest, and M. Roiter, 1996: International Satellite Cloud

Climatology Project (ISCCP) New Radiance Calibrations. WMO/TD-No. 736. World

Meteorological Organization.



Rossow, W.B., C.L. Brest, and M.D. Roiter, 1995: International Satellite Cloud

Climatology Project (ISCCP): Update of radiance calibration report. Technical

Document, World Climate Research Programme (ICSU and WMO), Geneva, Switzerland,

76 pp.



Weinreb, M., M. Jamieson, N. Fulton, Y. Chen, J.X. Johnson, C. Smith, J. Bremer, and J. Baucom, 1997: Operational Calibration of the Imagers and Sounders on the GOES-8 and -9 Satellites. NOAA Technical Memorandum NESDIS 44.



Journal Articles and Study Reports</b>



Gu, J. and E.A. Smith. 1997. High-resolution estimates of total solar and PAR

surface fluxes over large-scale BOREAS study area from GOES measurements.

Journal of Geophysical Research 102(D24):29,685-29,705.



Gu, J., E.A. Smith, G. Hodges, and H.J. Cooper, 1997: Retrieval of Daytime

Surface Net Longwave Flux over BOREAS from GOES Estimates of Surface Solar Flux

and Surface Temperature. Submitted to Canadian Journal of Remote Sensing.



Gu, J., E.A. Smith, H.J. Cooper, A. Grose, G. Liu, J.D. Merritt, M.J. Waterloo, A.C. Araujo, A,D. Nobre, A. O. Manzi, J. Marengo, P. J. Oliveira, C. Randow, J. Norman, P. S. Dias, 2002: Modeling carbon sequestration over large scale Amazon basin aided by satellite observations. Part 1: Wet and dry season SRB flux & Precipitation variability based on GOES retrievals. J. Appl. Meteoro.

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