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Investigation:

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

LBA Dataset ID:

PC06_Poster_001

Originator(s):

1. Betts, Alan K.
2. Fuentes, Jose D.
      3. Garstang, Michael
4. Ball, John H.

Point(s) of Contact:

Betts, Alan K. (akbetts@aol.com)

Dataset Abstract:

The surface diurnal cycles of temperature, humidity, lifting condensation level, equivalent potential temperature, together with the surface fluxes of sensible and latent heat, ground heat flux and net radiation, are analyzed for easterly and westerly lower tropospheric wind regimes during the wet season experiment of the Large-scale Biosphere- Atmosphere Experiment in Amazonia during January and February of 1999, using data collected in support of the ground validation for the Tropical Rainfall Measuring Mission. Composites show the difference between the wind regimes and the progression towards a wetter and cooler sub-cloud layer as the rainy season progresses. Daytime surface Bowen ratio is about 0.4 and falls slightly as the rainy season progresses. During the easterly wind regimes, the diurnal evolution of mixing ratio shows that the flux of water vapor through cloud-base exceeds the large surface evaporation. Composites of the boundary layer transformation by the passage over the site of convective bands during the easterly and westerly regime periods are shown. The boundary layer fall of equivalent potential temperature is similar for both regimes, but the boundary layer cooling by convective events during the westerly regimes is reduced, because the sub-cloud layer is shallower on average. Tethersonde ascents through the edges of gust fronts show that sub-cloud air is first cooled and moistened by rainfall evaporation. Associated data sets (description and document): Overview document LBABettsDatadoc.pdf
MC_1min.txt (1-min micromet data: MCDataDoc.pdf)
MC_10min.txt (10-min micromet data: MCDataDoc.pdf)
GA_MC_1min.txt (merged gas analyzer & micromet data: GA_MCDataDoc.pdf) TB_MC_1min.txt (merged tethersonde & micromet data: TB_MCDataDoc.pdf) RA_FullRes.txt; RA_TB_5&2mb.txt (VIZ rawinsonde and merged rawinsonde and tethersonde data: RA_TBDataDoc.pdf)
VA_FullRes.txt; VA_5&2mb.txt (Vaisala intercomparison data: VADataDoc.pdf)
TB2SEC.zip (raw 2sec tethered balloon data, Tb2secReadme.txt)

Beginning Date:

1999-01-01

Ending Date:

1999-02-28

Metadata Last Updated on:

2004-11-09

Data Status:

Not Applicable

Access Constraints:

Distribution Contact(s):


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.
Poster(s):

Search at ORNL DAAC

Documentation/Other Supporting Documents:

Preprint (pdf): Surface diurnal cycle and Boundary Layer structure over Rondonia during the rainy season :  ftp://daac.ornl.gov/data/lba/physical_climate/Betts/BettsLBA1.pdf

Citation Information - Other Details:

Betts, A. K., J. Fuentes, M. Garstang, and J. H. Ball, 2002: Surface diurnal cycle and Boundary Layer structure over Rondonia during the rainy season, J. Geophys. Res., 107, 8065, doi:10.1029/2001JD000356, 2002.

Keywords - Theme:

Parameter Topic Term Source Sensor
BOUNDARY LAYER PROCESSES ATMOSPHERE ATMOSPHERIC FLUX FIELD INVESTIGATION TETHERSONDE
CONVECTION ATMOSPHERE ATMOSPHERIC WINDS FIELD INVESTIGATION TETHERSONDE
PRECIPITATION AMOUNT ATMOSPHERE PRECIPITATION TOWER  
SURFACE FLUX ATMOSPHERE ATMOSPHERIC FLUX FIELD INVESTIGATION TETHERSONDE
DIURNAL MOVEMENTS ATMOSPHERE ATMOSPHERIC FLUX TOWER  

Uncontrolled Theme Keyword(s):  Bowen ratio, Diurnal cycles, TRMM, Wet season campaign

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

Related Publication(s):

Betts, A. K., J. Fuentes, M. Garstang, and J. H. Ball. (2002) Surface diurnal cycle and Boundary Layer structure over Rondonia during the rainy season, Journal of Geophysical Research-Atmospheres, 107(D20):8065, doi:10.1029/2001JD000356, 2002.

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