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PRE-LBA RONDONIA BOUNDARY LAYER EXPERIMENT (RBLE) DATA

Entry ID: PRE-LBA_RBLE

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Summary

Abstract: The atmospheric boundary layer (ABL) is the layer of air closest to the ground which is directly influenced on a daily basis by the heating and cooling of the earth's surface. The exact depth of the ABL varies according synoptic weather conditions and the time of day. During the daytime it is usually between 1 and 3 km; during the night it is much shallower. The ABL is important because it links ... the fluxes of heat and water vapor observed at the surface to the general circulation of the atmosphere. To model climate correctly, it is necessary for the ABL to be well understood and represented in the model. Because the air in the ABL is turbulent, small scale variations (about 1 km or less) in evaporation and heat flux at the surface are smoothed, with the temperature, humidity and depth of the ABL being uniform over the entire area. Larger scale variations (on the scale of 10 km or more) may lead to differences in ABL properties between the different surface types. Such differences may cause local atmospheric circulations to develop which may be important for the local climate of an area. During ABRACOS, three ABL measurement campaigns were carried out. These campaigns were called the Rondonia Boundary Layer Experiment (RBLE) 1, 2 and 3 and were held at Ji-Parana where the scale of the forested and deforested areas is large enough for each surface type to develop its own ABL. Refer to the related data set, Pre-LBA Anglo-Brazilian Amazonian Climate Observation Study (ABRACOS) Data, for additional information. The processed, quality controlled and integrated data in the documented Pre-LBA Data sets were originally published as a set of three CD_ROMs (Marengo and Victoria, 1998) but are now archived individually. The campaigns were held during the dry season when the difference in evaporation between the two surfaces types, forest and pasture, is at its greatest. Measurements were made with both free-flying radiosondes which measure temperature, humidity, and wind up to about 12 km and with a tethered balloon which makes more detailed measurements in the lowest 1 km of the atmosphere. Measurements were made at both the forest and clearing sites. Profiles of potential temperature measured during RBLE2 show that the daytime ABL was deeper over the clearing than the forest. The data have been used to test several models of ABL development. It appears that the ABL over pastures or over clearings grows more rapidly than predicted by the models, possibly because of the increased turbulence generated by the strips of forest typical of this area. The data have also been used to initialize one-dimensional climate models used in experiments to investigate the sensitivity of climate to land surface parameters, and to initialize a mesoscale model which can predict local effects on climate caused by the pattern of deforestation in this area.

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Description: PRE-LBA RONDONIA BOUNDARY LAYER EXPERIMENT (RBLE) DATA

Geographic Coverage

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Spatial coordinates

N: -10.0

S: -11.0

E: -61.0

W: -62.0

Data Set Citation

Dataset Originator/Creator: CALVET, J.C.COSTA, A.C.L.CULF, A.D.DA ROCHA, H.R.FISCH, G.LYRA, R.F.NOBRE, C.A.ROCHA, E.SOUZA, S.S.UBARANA, V.N.WRIGHT, I.R.

Dataset Title: PRE-LBA RONDONIA BOUNDARY LAYER EXPERIMENT (RBLE) DATA

Dataset Release Date: 2009

Dataset Release Place: Oak Ridge, Tennessee, U.S.A.

Dataset Publisher: Oak Ridge National Laboratory Distributed Active Archive Center

Data Presentation Form: Online Files

Dataset DOI: doi:10.3334/ORNLDAAC/917

Online Resource: http://mercury.ornl.gov/ornldaac/send/query?term2=917&term2attribut...

Temporal Coverage

Start Date: 1992-09-10

Stop Date: 1994-08-25

Location Keywords

CONTINENT > SOUTH AMERICA > BRAZIL

Science Keywords

ATMOSPHERE > ATMOSPHERIC TEMPERATURE > AIR TEMPERATURE

ATMOSPHERE > ATMOSPHERIC PRESSURE

ATMOSPHERE > ATMOSPHERIC WINDS > UPPER LEVEL WINDS

ATMOSPHERE > ATMOSPHERIC WATER VAPOR > WATER VAPOR

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Platform

RADIOSONDES

Instrument

Thermometers

BAROMETERS

ANEMOMETERS

HYGROMETERS

Project

ESIP > Earth Science Information Partners Program

EOSDIS > Earth Observing System Data Information System

LBA > Large Scale Biosphere-Atmosphere Experiment in Amazonia

Ancillary Keywords

FOREST

PROFILES

Data Set Progress

COMPLETE

Data Center

THE OAK RIDGE NATIONAL LABORATORY (ORNL) DISTRIBUTED ACTIVE ARCHIVE CENTER (DAAC)

Data Center URL: http://daac.ornl.gov/
Dataset ID: 917

Data Center Personnel
Name: ORNL DAAC USER SERVICES OFFICE Phone: (865) 574-7447 Email: uso at daac.ornl.gov Contact Address: ORNL DAAC User Services Office Oak Ridge National Laboratory City: Oak Ridge Province or State: TN Postal Code: 37831-6407 Country: USA

Personnel

JEAN CHRISTOPHE CALVET

Role: TECHNICAL CONTACT

Phone: 33-610-79341

Fax: 33-610-79626

Email: calvet at meteo.fr

Contact Address:

CNRM

Meteo-France

42 Avenue G Coriolis

City: Toulouse

Province or State: Cedex

Postal Code: 31057

Country: France

ORNL DAAC USER SERVICES OFFICE

Role: DIF AUTHOR

Phone: (865) 574-7447

Email: uso at daac.ornl.gov

Contact Address:

ORNL DAAC User Services Office

Oak Ridge National Laboratory

City: Oak Ridge

Province or State: TN

Postal Code: 37831-6407

Country: USA

Creation and Review Dates

DIF Creation Date: 2009-02-05

Last DIF Revision Date: 2012-08-14

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