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Investigation:

PC-06 (Betts / Maria Silva Dias / Pedro Silva Dias)

LBA Dataset ID:

PC06_ABRACOS_MicroClimate

Originator(s):

Betts, Alan K.

Point(s) of Contact:

Fuentes, Dr. Jose D. (jf6s@virginia.edu)
Betts, Alan K. (akbetts@aol.com)

Dataset Abstract:

This data set includes corrected micromet data collected at the ABRACOS pasture site (at Ouro Preto d'Oeste, Rondonia, Brazil; 10o 45' S, 62o 22'W) during the LBA/TRMM/WETAMC campaign, January-February, 1999. The correction of the data based on intercomparison with a gas analyzer, is discussed in the overview document [MCDataDoc.pdf]. Merged datasets for the surface micromet and gas analyzer, for the surface micromet and tethered balloon and for the Rawinsonde and tethered balloon (interpolated) have been produced. Several papers have used these data in preliminary form (Betts et al., 2002a,b; Betts and Jakob, 2002a,b; Silva Dias et al., 2002; Williams et al., 2002).
The main accomplishment is to reduce the relative mean biases between different humidity measurements [Microclimate, gas analyzer and dew point hygrometer, abbreviated MC, GA and DPH] to about 1%. There remain some uncertainties in the absolute calibration of both GA and DPH instruments against a dew point generator reference standard. Consequently, we believe that the absolute calibration accuracy of the humidity data may only be 1-2% in RH. This is however far superior to the accuracy of conventional RH sensors. An error of 1% in RH near noon, corresponds to 3 hPa in cloud-base, and to slightly less than 1K in θE. This is sufficient to give a corrected dataset, that is extremely valuable for the study of boundary layer and convective processes over Rondônia in the rainy season. The comparison between the radiosonde and tethered balloon is less satisfactory, as the absolute temperature standard is uncertain. The radiosondes are in the mean colder than the tethered balloon corrected to the tower data. However the comparison shows that the VIZ sonde has a wet bias, and the Vaisala sonde (for which we have 17 flights in parallel at this site) has a dry bias. This data set includes:
MC_1min.txt</b> (a corrected version of the original set of 1-minute field data: MCDataDoc.pdf )
MC_10min.txt</b> (10-minute average of MC_1min.txt)
Overview document LBABettsDatadoc.pdf Associated data sets: TB_MC_1min.txt (merged tethersonde & micromet data: TB_MCDataDoc.pdf)
GA_MC_10min.txt (merged gas analyzer & micromet data: GA_MCDataDoc.pdf)
Please cite these data as follows: We acknowledge use of the LBA/TRMM Abracos Pasture site merged dataset (Betts et al., 2002). Reference:
, 2002: Calibration and Correction of LBA/TRMM Abracos pasture site merged dataset. Available from LBA Beija-Flor Archives at CPTEC, Brasil, and ORNL DAAC, or on CD-ROM from Atmospheric Research, 58 Hendee Lane, Pittsford, VT 05763, USA.

Beginning Date:

1999-01-04

Ending Date:

1999-03-01

Metadata Last Updated on:

2011-09-25

Data Status:

In Preparation for Archive

Access Constraints:

Public

Data Center URL:

http://daac.ornl.gov

Distribution Contact(s):

ORNL DAAC User Services (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):

ABRACOS Pasture Site Micromet 1-min data :  ftp://daac.ornl.gov/data/lba/physical_climate/Betts/ABRACOS_Pasture/microclimate/data/MC_1MIN.zip
ABRACOS Pasture Site Micromet 10-min data :  ftp://daac.ornl.gov/data/lba/physical_climate/Betts/ABRACOS_Pasture/microclimate/data/MC_10MIN.zip

Documentation/Other Supporting Documents:

Micromet data set documentation (mcdatadoc.pdf):  ftp://daac.ornl.gov/data/lba/physical_climate/Betts/ABRACOS_Pasture/microclimate/comp/mcdatadoc.pdf
ABRACOS pasture site overview document (lbabettsdatadoc.pdf):  ftp://daac.ornl.gov/data/lba/physical_climate/Betts/ABRACOS_Pasture/lbabettsdatadoc.pdf

Citation Information - Other Details:

Betts, A. K., J. H. Ball and J.D.Fuentes. 2009. LBA-HMET PC-06 Corrected Microclimate Data, ABRACOS Pasture Site: January-March 1999. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.

Keywords - Theme:

Parameter Topic Term Source Sensor
DEW POINT ATMOSPHERE ATMOSPHERIC WATER VAPOR METEOROLOGICAL STATION DEWPOINT HYDROMETER
SURFACE FLUX ATMOSPHERE ATMOSPHERIC FLUX METEOROLOGICAL STATION  
PRECIPITATION AMOUNT ATMOSPHERE PRECIPITATION METEOROLOGICAL STATION RAIN GAUGE
WIND DIRECTION ATMOSPHERE ATMOSPHERIC WINDS METEOROLOGICAL STATION ANEMOMETER
SOIL TEMPERATURE LAND SURFACE SOILS FIELD INVESTIGATION SOIL TEMPERATURE PROBE
WIND SPEED ATMOSPHERE ATMOSPHERIC WINDS METEOROLOGICAL STATION ANEMOMETER
SOLAR RADIATION ATMOSPHERE RADIATION BUDGET METEOROLOGICAL STATION PYRANOMETER
LONGWAVE RADIATION ATMOSPHERE RADIATION BUDGET METEOROLOGICAL STATION PYRGEOMETER
AIR TEMPERATURE ATMOSPHERE ATMOSPHERIC WATER VAPOR METEOROLOGICAL STATION GAS ANALYZER
PHOTOSYNTHETICALLY ACTIVE RADIATION ATMOSPHERE ATMOSPHERIC CHEMISTRY METEOROLOGICAL STATION QUANTUM SENSOR

Uncontrolled Theme Keyword(s):  Anglo-Brazilian Amazonian Climate Observation Study (ABRACOS)

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
Rondonia Ouro Preto do Oeste -10.71278 -62.37222

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