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Pre-LBA Rondonia Boundary Layer Experiment (RBLE) Data
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Revision Date: January 14, 2009

Summary

This data set contains information about the atmospheric boundary layer conducted during three campaigns conducted over forested and deforested areas in Ji-Parana, Rondonia. Observations were made with radiosondes and tethered balloons. These three Rondonia boundary Layer Experiment (RBLE) campaigns were part of the Anglo-Brazilian Amazonizn Climate Observation study ( ABRACOS).

The data were used to characterize differences in the atmospheric boundary layer that develops over forested and cleared areas. In addition the data were used to initialize models that investigate the sensitivity of climate to land-surface parameters and to examine the local effects on climate of deforested areas.

Pre-LBA Data Set Collection Initiative

The Pre-LBA data set collection was dedicated to providing information to the LBA research community about existing data that have been collected in Amazonia during the 20 years prior to 1998. The main goal of this activity was to compile and document existing data sets in a consistent manner and make them available prior to the beginning of the LBA experiment.

The data set compilation efforts included satellite imagery, micrometeorological observations, near surface and upper-air atmospheric conditions, surface biophysical and hydrological measurements obtained from 1970s-1990s in a number of field experiments.  Data were collected for several intensive field campaigns, during the rainy and dry seasons, and other periods that vary from short intensive field campaigns to several years worth of observations, measured sometimes with a time resolution of 5 minutes and 1 hour.

 

Citation:

Cite this data set as follows:

Fisch, G., E. Rocha, S.S. Souza, A.D. Culf, C.A. Nobre, H R. Rocha, R.F. Lyra, A.C.L. Costa, V.N. Ubarana, J.C. Calvet, and I.R. Wright. 2009. Pre-LBA Rondonia Boundary Layer Experiment (RBLE) Data. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/917.

The original CD-ROM citation is as follows:

Marengo, J.A., and R.L. Victoria. 1998. Pre-LBA Data Sets Initiative, 3 vols. [Pre-Large-Scale Biosphere-Atmosphere Experiment in Amazonia Data Sets Initiative, 3 vols.]. CD-ROM. Centro de Previsao de Tempo e Estudios Climaticos, Instituto Nacional de Pesquisas Espaciais (CPTEC/INPE) [Center for Weather Forecasting and Climate Study, National Institute for Space Research], Sao Paulo, Brazil.

 

Pre-LBA Data Set Collection Metadata

Campaign: RBLE > Rondonia Boundary Layer Experiment

Keywords
RONDONIA
RADIOSONDE
RAWINSONDE
TETHERED BALOON
FORES
GRASSLAND
PROFILES

Investigator
Last_name: Fisch
First_name: Gilberto
Email: gfisch@aca.iae.cta.br
Phone: 55 12 3474565
FAX: 55 12 3412522

Address: IAE/CTA/ACA
Praca Marechal Eduardo Gomes, 5
Vila das Acacias
City: Sao Jose dos Campos
State_or_Province: Sao Paulo 12228-901
Country: Brazil
 

Last_name: Rocha
First_name: Edson
Middle_name: J. P.
Email: edson@cptec.inpe.br
Phone: +55-12-560.8413
FAX: +55-12-560.8413

Address: INPE/CPTEC
Rodovia Presidente Dutra, Km 40
C. P.01 - Zip code:12630-000
City: Cachoeira Paulista
State_or_Province: Sao Paulo
Country: Brazil
 

Last_name: Souza
First_name: Solange
Middle_name: Silva
Phone: 55-12-560-8413
FAX: 55-12-561-2835

Address: INPE
Rodvia Presidente Dutra KM 39
City: Cachoeira Paulista 12630-000
State_or_Province: SP
Country: Brazil
 

Last_name: Culf
First_name: Alistair
Middle_name: D.

Address: Institute of Hidrology
Crowmarsh Gifford OX108BB
City: Wallingford
Country: UK
 

Last_name: Nobre
First_name: Carlos
Middle_name: A.
Email: nobre@cptec.inpe.br
Phone: +55 12 561 2822
FAX: +55 12 561 2835

Address: CPTEC-INPE
Rodovia Presidente Dutra, Km 40
Caixa Postal 01
City: Choeira Paulista - 12630-000
State_or_Province: SP
Country: Brazil
 

Last_name: Rocha
First_name: Humberto
Middle_name: Ribeiro
Email: humberto@helicon.iag.usp.br
Phone: 55 11 8184705
FAX: 55 11 8184714

Address: Departamento de Ciências Atmosfericas
Universidade de Sao Paulo
R. Matao 1226 - Cidade Universitaria
City: Sao Paulo
State_or_Province: Sao Paulo 05508-900
Country: Brazil
 

Last_name: Lyra
First_name: Roberto
Middle_name: F. da F.

Address: Universidade Federal de Alagoas
City: Maceio
State_or_Province: Alagoas 57072-970
Country: Brazil
 

Last_name: Costa
First_name: Antonio
Middle_name: Carlos Lola

Address: Universidade Federal do Para
Last_name: Ubarana
First_name: Vinicios
Middle_name: N.
Address: The Weather Channel
Cumberland Parkway
City: Atlanta 30339
State_or_Province: Georgia
Country: USA

Last_name: Calvet
First_name: Jean
Middle_name: Christophe
Email: calvet@meteo.fr
Phone: 33-61079341
FAX: 33-61079626

Address: CNRM
Meteo-France
42 Avenue G Coriolis
City: Toulouse 31057
State_or_Province: Cedex
Country: France
 

Last_name: Wright
First_name: Ivan
Middle_name: R.

Address: Institute of Hydrology
Crowmarsh Gifford
City: Wallingford OX108BB
Country: UK
 

Technical_Contact
Last_name: Fisch
First_name: Gilberto
Email: gfisch@aca.iae.cta.br
Phone: 55 12 3474565
FAX: 55 12 3412522

Address: IAE/CTA/ACA
Praca Marechal Eduardo Gomes, 5
Vila das Acacias
City: Sao Jose dos Campos
State_or_Province: Sao Paulo 12228-901
Country: Brazil
 

Start_Date:1992-09-10
Stop_Date: 1994-08-25

Coverage
Southernmost_latitude: 11S
Northernmost_latitude: 10S
Westernmost_longitude: 62W
Easternmost_longitude: 61W
Minimum_altitude:120m
Maximum_altitude: 20m
 

Location: South America

Author
Last_name: Fisch
First_name: Gilberto
Email: gfisch@aca.iae.cta.br
Phone: 55 12 3474565
FAX: 55 12 3412522
Address: IAE/CTA/ACA

Praca Marechal Eduardo Gomes, 5
Vila das Acacias
City: Sao Jose dos Campos
State_or_Province: Sao Paulo 12228-901
Country: Brazil
 

Data_Center
Data_Center_Name: CPTEC/INPE,CTA,UFAL,UFPA,IH-UK
Data_Center_URL: http://www.cptec.inpe.br/lba/prelba/prelba.html
Dataset_ID: RBLE
 

Data_Center_Contact
Last_name: Fisch
First_name: Gilberto
Email: gfisch@aca.iae.cta.br
Phone: 55 12 3474565
FAX: 55 12 3412522

Address: IAE/CTA/ACA
Praca Marechal Eduardo Gomes, 5
Vila das Acacias
City: Sao Jose dos Campos
State_or_Province: Sao Paulo 12228-901
Country: Brazil
 

Constraints

Access: Data may not be used for commercial applications.
Use: Data may not be used for commercial applications.

Data Description

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 atmospheric boundary layer (ABL).

The data collected in each of the three campaigns has been compiled and compressed into separate .zip files:  RBLE1.zip, RBLE2.zip, and RBLE3.zip.

Descriptions of the campaigns, data file formats, and examples of data files are provided below.

RBLE1:  First Mission of the RBLE Project, Reserva Jaru, near Ji-Parana, Rondonia 

These files are from the First Mission of the RBLE Project, at the city of Ji-Parana/RO.
This mission took place at the "Reserva" site, in forest area. The data was compiled for the period September 11-October 3 1992.

Initially, 120 radiosonde launchings were scheduled but due to problem with the equipment, 2 were lost.

The soundings with tethered balloon were used to follow the diurnal development of the moisture layer and depended on weather conditions, since the launchings were made in good weather and no rain.
70 launchings were actually made.

1) Files bcddmmhh.lim; the files were checked for consistency (elimination of unusual values and bugs);
2) Files "B(S or D)ddmmhhhh.COR

These were implemented from the files (*.lim). In this case the vertical oscillations of the balloon were eliminated using some software. The ascending and descending were separated in two different files (s=ascending, d=descending). All these information are referred to tethered balloon.

RBLE1:  Reserva Jaru, near Ji-Parana, Rondonia, Example Data Records

BC130917.LIM

   173655     123.    993.7    23.55    22.70    17.37   297.23      0.8      31.
   173706     123.    993.7    23.53    22.63    17.27   297.22      0.6      40.
   173716     127.    993.3    23.52    22.63    17.29   297.25      0.9      27.
   173726     131.    992.9    23.53    22.60    17.24   297.29      0.6      28.
   173737     131.    992.8    23.60    22.56    17.15   297.36      0.5      87.
   173747     130.    993.0    23.62    22.54    17.11   297.36      0.5     107.
   173758     136.    992.3    23.70    22.51    17.04   297.51      0.6     115.
 

 BD130917.COR

  175325   137   978.7   25.78   20.71   13.69   300.78   1.0   139
  175335   136   978.9   25.78   20.70   13.67   300.76   1.0   140
  175346   134   979.0   25.76   20.68   13.65   300.72   1.2   145
  175407   131   979.3   25.72   20.64   13.60   300.66   1.1   148
  175427   128   979.7   25.70   20.57   13.50   300.61   1.2   150
  175448   125   980.1   25.63   20.53   13.47   300.50   1.1   149
  175519   122   980.3   25.35   20.62   13.72   300.20   1.5   150
  175530   120   980.6   25.24   20.63   13.77   300.07   1.6   152
  175540   119   980.7   25.23   20.63   13.77   300.04   1.6   148
  175632   117   980.9   25.17   20.63   13.81   299.97   1.6   145

 

RBLE2: FARM (farm = fazenda)

README for the FAZENDA data files

Each file, with radiosonde data, shows the following structure: ddmmhh.aed,
where hh is the time of launching, mm is the month, and dd is the date.

The files with tethered balloon were organized in up (ascending) and dow (descending)
with the following structure:

bcddhh.up (des): bc is tethered balloon, dd date, and hh is the time of ascending.

The format of the files *.aed is as follows:
- 1o. column -> minutes
- 2o. column -> seconds
- 3o. column -> altitude from the station level (m)
- 4o. column -> pressure (mb)
- 5o. column -> dry bulb temperature (C)
- 6o. column -> Humidity (%)
- 7o. column -> wet bulb temperature (C)
- 8o. column -> wind direction (degrees)
- 9o. column -> wind speed (m/s)

The format of the *.up and *.dow is as follows:

- 1o. column -> hour
- 2o. column -> height (m)
- 3o. column -> pressure (mb)
- 4o. column -> dry bulb temperature (C)
- 5o. column -> wet bulb temperature (C)
- 6o. column -> potential temperature (C)
- 7o. column -> wind speed (m/s)
- 8o. column -> wind direction (degrees)

The radiosondes were launched with weather balloons of 350 gr, radiosonde Vaisala RS80-15 and equipment MARWIN MW-12.

The soundings of tethered balloon were made with balloon type Zepellin and equipment ATMOSPHERIC DATA ACQUISITION SYSTEM - ADAS.

RBLE2: FARM, Example for FAZENDA

170721.AED

   0  0   220  983.0  29.9  63   22.1   180    2.0
   0 10   274  977.0  28.0  49   16.3  195    2.4
   0 20   333  970.6  27.5  50   16.2  206    3.1
   0 30   387  964.7  27.0  51   16.0  213    3.8
   0 40   436  959.3  26.5  51   15.6  218    4.6
   0 50   480  954.6  26.1  52   15.5  222    5.4
   1  0   523  950.0   25.8  52   15.2  224    6.2
   1 10   570  944.9  25.3  54   15.4  226    6.9
   1 20   632  938.2  24.7  55   15.1  227    7.6
   1 30   686  932.5  24.2  56   14.9  228    8.1
   1 40   737  927.1  23.7  57   14.7  229    8.5
 

BC1821.UP

  214340       2.    982.2    28.16    21.96   302.86      0.3     138.   40050F
  214350       2.    982.2    28.03    21.75   302.73      0.6     150.   40050F
  214401       2.    982.3    28.02    21.59   302.72      0.8     157.   40050E
  214411       6.    981.8    28.09    21.54   302.83      0.7     160.   40050F
  214421       2.    982.3    28.04    21.53   302.73      0.7     158.   40050F
  214432       3.    982.2    28.01    21.55   302.71      0.7     156.   40050E
  214442       7.    981.7    28.12    21.55   302.86      1.0     152.   40050F
  214452      16.    980.7    28.39    21.55   303.23      1.2     146.   40050E
  214503      22.    980.0    28.45    21.56   303.35      1.4     152.   40050E
  214513      22.    980.0    28.57    21.55   303.47      1.3     155.   40050F
  214524      29.    979.3    28.55    21.58   303.52      1.3     162.   40050E
  214534      33.    978.8    28.54    21.52   303.54      1.4     160.   40050F
 

BC1821.DOW

  220208 88888888 88888888 88888888    19.43 88888888 88888888 88888888   40050F
  220218 88888888 88888888 88888888 88888888 88888888      1.9 88888888   40050D
  220229     443.    934.4    25.06    19.45   304.05 88888888 88888888   40050E
  220239     460.    932.6    24.99 88888888   304.15      1.4     116.   40050F
  220249 88888888 88888888    24.99    19.36 88888888 88888888     127.   40050F
  220300 88888888 88888888 88888888    19.44 88888888      1.6     135.   40050F
  220310 88888888 88888888 88888888 88888888 88888888      1.7     135.   40050E
  220320 88888888    936.0 88888888 88888888 88888888 88888888     125.   40050F
  220331     566.    921.4    25.07 88888888   305.28      1.8 88888888   40050E
  220341 88888888 88888888    25.26    20.51 88888888      1.8     109.   40050E
 

 

RBLE2: FLORESTA (floresta = forest)

README for the FLORESTA data files:


These are files about the launching of radiosondes (arquivos *.aed) and tethered balloon (*.dow e *.up ).
Each file, with radiosonde data follows this structure: dmmhh.aed,
where hh is the launching time, mm is the month and dd the date.
The tethered balloon data was grouped in sub (ascending) and des (descending) with the following structure: bcddhh.up (des),
where bc is the tethered balloon, dd date, hh is the launching time.
The format of the files *.aed is as follows:
- 1o. column -> minutes
- 2o. column -> seconds
- 3o. column -> altitude from the station level (m)
- 4o. column -> pressure (mb)
- 5o. column -> dry bulb temperature (C)
- 6o. column -> Humidity (%)
- 7o. column -> wet bulb temperature (C)
- 8o. column -> wind direction (degrees)
- 9o. column -> wind speed (m/s)

The format of the *.up and *.dow is as follows:
- 1o. column -> hour
- 2o. column -> height (m)
- 3o. column -> pressure (mb)
- 4o. column -> dry bulb temperature (C)
- 5o. column -> wet bulb temperature (C)
- 6o. column -> potential temperature (C)
- 7o. column -> wind speed (m/s)
- 8o. column -> wind direction (degrees)
The radiosondes were launched with weather balloons of 350 gr, radiosonde Vaisala RS80-15 and equipment MARWIN MW-12.
The soundings of tethered balloon were made with balloon type Zepellin and equipment ATMOSPHERIC DATA ACQUISITION SYSTEM - ADAS.

RBLE2: FLORESTA, Example for FLORESTA


030700.AED

   0  0   120  995.8  27.0  85   24.3   45    0.1
   0 10   168  990.5  27.4  86   24.9    9    0.5
   0 20   218  984.9  27.8  73   22.5    5    0.9
   0 30   266  979.7  28.2  66   21.3    3    1.3
   0 40   316  974.2  28.0  64   20.6    2    1.8
   0 50   366  968.7  27.8  64   20.4    2    2.2
   1  0    413  963.5  27.3  65   20.2    2    2.7
   1 10   470  957.4  27.0  67   20.4    1    3.1
   1 20   522  951.8  26.5  67   19.9    1    3.4
   1 30   574  946.3  26.1  68   19.8    1    3.7
 

BC0415.UP

  145633       0.    999.8    29.04    24.82   302.21      1.1     243.   40050D
  145704       5.    999.2    29.58    24.97   302.79      1.6     266.   40050E
  145735      19.    997.7    29.20    24.44   302.55     2.0     256.   40050D
  145806      31.    996.4    28.96    24.23   302.42     2.5     252.   40050D
  145837      49.    994.3    29.04    23.99   302.69     2.0     249.   40050D
  145908      62.    992.9    29.00    23.78   302.76     2.7     260.   40050D
  145939      76.    991.3    28.81    23.66   302.71     2.4     253.   40050D
  150011      93.    989.4    28.60    23.61   302.66     2.5     276.   40050D
  150042     103.    988.3    28.51    23.69   302.68    2.7     274.   40050D
  150113     118.    986.6    28.32    23.53   302.63    3.1     270.   40050D
  150144     129.    985.5    28.13    23.48   302.54    2.9     269.   40050D
  150215     144.    983.8    28.06    23.52   302.63    2.6     271.   40050D
 

BC0415.DOW

  153828    1231.    869.3    19.13    18.05   304.23      3.2      39.   40050E
  153859    1226.    869.8    20.03    17.28   305.12      0.0      39.   40050E
  153930    1221.    870.3    20.76    16.35   305.83     -0.0      39.   40050E
  154001    1204.    872.0    21.67    16.54   306.60      0.0      16.   40050E
  154032    1183.    874.1    22.15    16.75   306.89      0.0      37.   40050E
  154103    1176.    874.8    21.78    16.69   306.43      0.0      47.   40050F
  154134    1167.    875.7    22.13    16.84   306.71      0.0      38.   40050F
  154205    1161.    876.3    21.70    16.90   306.20      0.0      44.   40050F
  154236    1150.    877.4    21.85    17.47   306.24      0.0      35.   40050E
  154307    1141.    878.4    22.05    17.92   306.36      0.1      39.   40050E
  154339    1130.    879.4    22.08    18.08   306.28      0.0      39.   40050F
  154410    1122.    880.3    21.59    17.60   305.69      0.0      41.   40050F
  154441    1111.    881.4    21.53    17.96   305.52      0.0      34.   40050F

 

RBLE3:  Fazenda (farm) Nossa Senhora de Aparecida

Documentation on data from RBL3 provided by Dr. Alistair Culf (Institute of Hydrology, UK):


README for filenames: *.dat
COLUMN 1= Date month, location: Fazenda Nossa Senhora de Aparecida
COLUMN 2= year
COLUMN 3= Local time
COLUMN 4= (C) air temperature
COLUMN 5= (C) variance of air temperature
COLUMN 6= (G/KG) specific humidity
COLUMN 7= (G/KG) variance of specific humidity
COLUMN 8= (M/S) vertical velocity
COLUMN 9= (M/S) variance of vertical velocity
COLUMN 10=(M/S) wind speed
COLUMN 11=(M/S) variance of wind speed
COLUMN 12= (V/S) friction velocity
COLUMN 13= (W/M2) - H - sensible heat flux
COLUMN 14= (W/M2) - LE - latent heat flux
COLUMN 15= (W/2) Net radiation (nor measured by HYDRA, data comes from the AWS)
COLUMN 16= Recovery factor (discard RN since it was not measured)
COLUMN 17= Atmospheric stability (Z/L) (L=Monin-Obhukov parameter)
COLUMN 18= Ratio entre sigma/ W/sigma U*
COLUMN 19= QV parameter (if QV4 or QV<-4, then WV are dubious)
COLUMN 20= (S/M) Calculated atmospheric conductance
COLUMN 21= status (correct data= 0000, wrong data=3333)
VALORES -9999 indicates lack of data and values marked as -xxxx in fluxes
indicate that they should be subtracted by -9000 (estimated following Monin-Obhukov theory)

README for filenames: *.pvz
Example Format:
Started at 13 August 94 21:2 GMT1:2 Station : 313 Location : 10.10 S 61.90 W 120 120 m Sounding type : PTU Omega RS-number : 072649446 Sounding
processor serial number: 644189er: Ground check : Ref RS Corr Corr Pressure : 1000.4 998.3 2.1 2.1 Temperature : 29.7 29.8 -0.1-0.1 Humidity : 0 -1 1 1
Clouds : ///// Special 1 : ///// Special 2 : ///// Telemetry noise level : 100 % P T U Accepted (%) : 99.6 99.8 99.499.4 Replaced (%) : 0.4 0.2 0.6 0.6 Rejected (%) : 0.0 0.0 0.0 0.0
Omega stations in wind calculations (%)tion Norway : 46.6 Liberia : 20.7 Hawaii : 100.0 North Dakota : 100.0 La Reunion : 87.1 Argentina : 100.0 Australia : 99.4
Japan : 0.0 Krasnodar : 0.0 Komsomolskamur : 0.0 Novosibirsk : 0.0 Reason for termination : Increasing pressure Time Pressure Height Temperature RH Speed Direction
min s hPa gpm deg C % m/s deg. 0 0 1000.5 120 32.0 80 0.5 330 0 10 992.7 190 29.1 56 0.7 348 0 20 987.1 240 28.7 57 0.8 5 0 30 981.3 293 28.2 58 0.9 22 0 40 975.8 343 27.8 59 1.0 38 ...

RBLE3:  Fazenda (farm) Nossa Senhora de Aparecida, Example Data Records


FNSRBLE3.DAT


H2-11AUG 94 11-12  20.8  0.54  11.1  1.90  0.16  0.62   5.2  0.36  0.48   128    76    -1-327.4 -0.06   1.3  -1.3    23 2100
H2-11AUG 94 12-13  21.2  0.75  11.0  0.63  0.18  0.66   5.2  0.36  0.50   216   152    -1-604.4 -0.10   1.3  -1.7    21 0000
H2-11AUG 94 13-14  21.8  0.74  10.9  0.52  0.19  0.71   5.5  0.35  0.58   238   155    -1-630.5 -0.09   1.2  -1.8    16 0000

H2-11AUG 94 14-15  21.6  0.42  11.0  0.77  0.17  0.53   5.1 -9999  0.39    73    70    -1-237.0 -0.04   1.4  -1.2    32 0000

H2-11AUG 94 15-16  21.2  0.33  11.2  0.46  0.14  0.53   4.5  0.27  0.39    65    78    -1-228.0 -0.05   1.4  -1.3    29 0000
H2-11AUG 94 16-17  20.7  0.19  11.7 -9999  0.14  0.40   4.0 -9999  0.29    28    38    -1 -98.7 -0.03   1.4  -1.1    46 0000

H2-11AUG 94 17-18  19.7 -9999  12.0 -9999  0.09  0.30   3.1  0.12  0.22     3    19    -1 -63.4 -0.02   1.3  -0.8    61 0000

H2-11AUG 94 18-19  18.6 -9999  12.3 -9999  0.00  0.12   2.1 -9999  0.06    -4     5    -1 -13.1  0.01   2.1  -0.3   593 0000

FO081321.PVZ

Complete listing of Fine Structure

File: C:\RBLE3\94081321.02E

Started at 13 August 94 21:2  GMT1:2
Station :  313
Location : 10.10 S  61.90 W   120 120 m
Sounding type : PTU Omega
RS-number : 072649446
Sounding processor serial number: 644189er:

Ground check  Ref     RS   Corr  Corr

Pressure    : 1000.4  998.3    2.1 2.1

Temperature :   29.7   29.8   -0.1-0.1

Humidity    :      0     -1      1   1

 

Clouds    : /////

Special 1 : /////

Special 2 : /////

 

Telemetry noise level  : 100 %

 

P      T      U

Accepted (%) :  99.6   99.8   99.499.4

Replaced (%) :   0.4    0.2    0.6 0.6

Rejected (%) :   0.0    0.0    0.0 0.0

 

Omega stations in wind calculations (%)tion

Norway          :  46.6

Liberia         :  20.7

Hawaii          : 100.0

North Dakota    : 100.0

La Reunion      :  87.1

Argentina       : 100.0

Australia       :  99.4
Japan           :   0.0
Krasnodar       :   0.0

Komsomolskamur  :   0.0

Novosibirsk     :   0.0

Reason for termination : Increasing pressure

Time Pressure   Height  Temperature  RH     Speed Direction

min  s      hPa      gpm     deg C      %    m/s   deg.

  0   0    1000.5    120     32.0     80    0.5  330

  0  10     992.7    190     29.1     56    0.7  348

  0  20     987.1    240     28.7     57    0.8    5

  0  30     981.3    293     28.2     58    0.9   22

  0  40     975.8    343     27.8     59    1.0   38

  0  50     970.4    392     27.3     60    1.1   52

  1   0     964.7    444     26.8     61    1.1   66

  1  10     959.1    496     26.3     63    1.1   78

  1  20     953.2    550     25.9     63    1.1   88

  1  30     947.4    604     25.3     64    0.9   95

BC1317F.SCOc
174238     1  1000.40  26.55  24.48  18.76  299.67   0.00  242

174249     3  1000.20  26.55  24.41  18.64  299.68   0.00  266

174259     4  1000.10  26.57  24.38  18.59  299.72   0.00  293

174309     8   999.60  26.67  24.47  18.70  299.86   0.00  284

174320    15   998.80  26.92  24.57  18.78  300.18   0.00  248

174330    25   997.70  27.10  24.74  19.00  300.44   0.10  162

174341    34   996.70  27.61  24.25  17.98  301.05   0.80  132

174351    42   995.80  27.94  23.80  17.12  301.45   1.00  128

174401    51   994.70  28.19  23.45  16.47  301.80   1.30  115

174412    60   993.70  28.23  23.29  16.22  301.93   1.30  111

174422    71   992.60  28.27  23.16  16.02  302.06   1.40   97

174432    81   991.50  28.32  23.05  15.85  302.21   1.40   99

174443    88   990.60  28.29  23.02  15.83  302.25   1.30  105

174453    97   989.70  28.24  23.00  15.84  302.29   1.30   97

174503   107   988.60  28.16  22.96  15.83  302.30   1.30  100

174514   117   987.40  28.12  22.92  15.81  302.36   1.20   98

174524   126   986.40  28.03  22.90  15.84  302.37   1.30  105

Rondonia Boundary Layer Experiment: Background Information

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 the Anglo-Brazilian Amazonian Climate Observation Study (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 data collected in each of the campaigns and the data file formats are described in the Data Description section. 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 RBLE 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. 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.

References

Culf, A.D.; Fisch, G.; Malhi, Y.; Nobre, C.A. The influence of the atmospheric boundary layer of carbon dioxide concentrations over a tropical forest. Agricultural and Forest Meteorology,85 (1-2:149-187,1997).

Dolman, A.J.; Silva Dias, M.A.F.; Calvet, J.C.; Ashby, M.; Tahara, A.S.; Delire, C.; Kabat, P.; Fisch, G.; Nobre, C.A. Meso- scale effects of tropical deforestation in Amazonia: preparatory LBA modelling studies, Annales geophysicae, 17(8): 1095-1110. 

Fisch, G.; Nobre, C.A. The atmospheric boundary layer in the Amazon region. Proceedings of the Special Symposium on Boundary Layer and Turbulence (77 Annual Meeting of AMS), Long Beach, 2-7/2/97, p. 72-75, 1997.

Rocha, H.R.; Nobre, C.A.; Bonatti, J.P.; Wright, I.R.; Sellers, P.J. A vegetation-atmosphere interaction study for Amazonia deforestation using field data and a "single column"model. Quarterly Journal of the Royal Meteorological Society, 122(531): 567-594.

Academic Thesis and Dissertations:

da Silva, J.T.Estimativa regional de fluxos de calor sensivel e latente em areas de floresta e pastagem na Amazonia,111p.

Carmo, A.M.C. do. Estudo da Estrutura Termodinamica da Atmosfera sobre a Amazonia. Tese de Mestrado, INPE, Sao Jose dos Campos, Brasil, 111 p, 1996.

Fisch, G. Camada Limite Amazonica: aspectos observacionais e de modelagem. Tese de Doutorado (INPE 6123 - TDI/584), INPE, Sao Jose dos Campos, Brasil, 171p, 1996.

Souza, S. S., A Substituicao da Floresta Amazonica por Pastagem e sua Repercussao ao Nivel da Termodinamica da Camada Limite Atmosferica: Projeto RBLE. Tese de Mestrado, UFPB, Campina Grande, 103p, 1997.

Silva, M.A.V. Modelagem Estatistico-Dinamica de Media Zonal Incluindo Parametrizacao explicita da Vegetacao. Tese de Doutorado, INPE, Sao Jose dos Campos, Brasil, 156 p, 1996.

Books

Fisch, G.; Culf, A.D.; Nobre, C.A. Modelling convective boundary layer growth in Rondonia. In: Gash, J.H.C.; Nobre, C.A.; Roberts, J.M. e Victoria, R.L. (eds). Amazonia deforestation and climate. John Wiley & Sons, Chichester (UK), p. 425-435, 1996.

Nobre, C.A.; Fisch, G.; Rocha, H.R.; Lyra, R.F.F.; Rocha, E.J.P.; Costa, A.C.L. da; Ubarana, V.N. Observations of the atmospheric boundary layer in Rondonia. In: Gash, J.H.C.; Nobre, C.A.; Roberts, J.M. e Victoria, R.L. (eds.). Amazonia deforestation and climate. John Wiley & Sons, Chichester (UK), p.425-435, 1996.

Silva Dias, M.A.F.; Regnier, P. Simulations of mesoscale circulations in a deforested area in Rondonia in the dry season. In: Gash, J.H.C.; Nobre, C.A.; Roberts, J.M.; Victoria, R.L., ed. Amazonia deforestation and climate. John Wiley & Sons, Chichester (UK), p. 425-435, 1996.

Data Access:

This data is available through the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC)  [http://daac.ornl.gov].

Data Archive Center:

Contact for Data Center Access Information:

E-mail: uso@daac.ornl.gov
Telephone: +1 (865) 241-3952