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Investigation:

CD-01 (Denning / Dias)

LBA Dataset ID:

CD01_CIRSAN_METEOROLOGY

Originator(s):

1. DIAS, M.A.
2. DIAS, P.L.S.
3. LONGO, M.
      4. FITZJARRALD, D.R.
5. DENNING, A.S.

Point(s) of Contact:

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

Dataset Abstract:

The CIRSAN/LBA field campaign was conducted close to two major rivers of the Amazon Basin, the Tapajos and the Amazon. Data were collected from four sites using sonic radar (sodar), pilot balloon and radiosonde at various frequencies in July and August 2001. The observations indicate that during weak trade wind episodes the Tapajos River breeze actually induces a westerly flow at the eastern margin with an associated line of shallow cumulus. The atmospheric circulation induced by the river has been interpreted with the help of a high resolution numerical simulation

Beginning Date:

2001-06-01

Ending Date:

2001-08-16

Metadata Last Updated on:

2012-09-05

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-01 Meteorological Data, Tapajos and Amazon Rivers, Santarem, Brazil: 2001 :  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1114

Documentation/Other Supporting Documents:

LBA-ECO CD-01 Meteorological Data, Tapajos and Amazon Rivers, Santarem, Brazil: 2001 :  http://daac.ornl.gov/LBA/guides/CD01_CIRSAN_Meteorology_2001.html

Citation Information - Other Details:

Dias, M.A., P.L.S. Dias, M. Longo, D.R. Fitzjarrald, and A.S. Denning. 2012. LBA-ECO CD-01 Meteorological Data, Tapajos and Amazon Rivers, Santarem, Brazil: 2001. Data set. Available on-line [http://daac.ornl.gov ] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. http://dx.doi.org/10.3334/ORNLDAAC/1114

Keywords - Theme:

Parameter Topic Term Source Sensor
AIR TEMPERATURE ATMOSPHERE TERRESTRIAL ECOSYSTEMS WEATHER BALLOON RADIOSONDE
ATMOSPHERIC PRESSURE ATMOSPHERE TERRESTRIAL ECOSYSTEMS WEATHER BALLOON RADIOSONDE
ATMOSPHERIC STABILITY ATMOSPHERE TERRESTRIAL ECOSYSTEMS WEATHER STATIONS SODAR (SOUND DETECTION AND RANGING)
HUMIDITY ATMOSPHERE TERRESTRIAL ECOSYSTEMS WEATHER BALLOON RADIOSONDE
INVERSION HEIGHT ATMOSPHERE TERRESTRIAL ECOSYSTEMS WEATHER STATIONS SODAR (SOUND DETECTION AND RANGING)
RADIANCE ATMOSPHERE TERRESTRIAL ECOSYSTEMS GOES-8 (GEOSTATIONARY OPERATIONAL ENVIRONMENTAL SATELLITE-8) GOES-8 IMAGER
UPPERLEVEL WINDS ATMOSPHERE TERRESTRIAL ECOSYSTEMS WEATHER STATIONS SODAR (SOUND DETECTION AND RANGING)
UPPERLEVEL WINDS ATMOSPHERE TERRESTRIAL ECOSYSTEMS WEATHER STATIONS WIND SENSOR
UPPERLEVEL WINDS ATMOSPHERE TERRESTRIAL ECOSYSTEMS WEATHER BALLOON RADIOSONDE

Uncontrolled Theme Keyword(s):  AMAZON, METEOROLOGY, SATELLITE IMAGES, WEATHER

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
    -2.43000 -2.78000 -54.72000 -55.17000

Related Publication(s):

Dias, M.A.F.S., P.L.S. Dias, M. Longo, D.R. Fitzjarrald, and A.S. Denning. (2004) River breeze circulation in eastern Amazonia: observations and modelling results. Theoretical and Applied Climatology 78(1-3):111-121.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

Measurements from pilot balloons, radiosonde and sonic radar were collected in July and August of 2001 from multiple locations and at varying frequencies. Those data are presented in comma-delimited ASCII files. Weather forecasts for the region were collected during the study period and are available as a text (.txt)file. These measurements were used to run a global analysis for the Pacific and South American regions. The CPTEC/GPSA analyses for the CIRSAN period are available on-line in GRIB format. The dataset also contains CTL files, so the data can be accessed by GrADS. Finally a large number of visible and infrared satellite images for the study region are available.



Radiosonde Data

File #1: CIRSAN_radiosonde_Belterra_July_2001.csv

File #2: CIRSAN_radiosonde_Belterra_August_2001.csv



File Format



Column,Column_heading,Units/format,Description,,,,,,,,,,,

1,Date,mm/dd/yyyy,Sample date,,,,,,,,,,,

2,Year,yyyy,Year sampled. All samples were collected in 2001.,,,,,,,,,,,

3,Month,mm,Month sampled. All samples included in this file were collected in July.,,,,,,,,,,,

4,Day,dd,Day sampled (day of the month),,,,,,,,,,,

5,T_launch,UTC,Time balloon was launched given in UTC. Local time is GMT-4.,,,,,,,,,,,

6,Asc_rate,m/s,Balloon ascension rate reported in meters per second (m/s),,,,,,,,,,,

7,Ht_geosp,m,Geopotential height in meters (m) at time measurements were recorded ,,,,,,,,,,,

8,Air_press,hPa,Barometric pressure recorded in hectopascals (hPa),,,,,,,,,,,

9,Air_T,degrees C,Air temperature reported in degrees Celsius,,,,,,,,,,,

10,U_rel,%,Relative humidity reported in percent,,,,,,,,,,,

11,T_dewpoint,degrees C,Dewpoint temperature reported in degrees Celsius,,,,,,,,,,,

12,Wind_dir,degrees,Wind direction,,,,,,,,,,,

13,Windspeed,m/s,Windspeed in meters per second,,,,,,,,,,,

14,T_pot,degrees K,Potential temperature reported in degrees Kelvin,,,,,,,,,,,

15,R_mix,g/kg,Water vapour mixing ratio,,,,,,,,,,,

,,,,,,,,,,,,,,

,Missing data is represented by -9999.9,,,,,,,,,,,,,

,,,,,,,,,,,,,,



Example data for the Radiosonde data files



Date,Year,Month,Day,T_launch,Asc_rate,Ht_geosp,Air_press,Air_T,U_rel,T_dewpoint,Wind_dir,Windspeed,T_pot,R_mix

7/18/2001,2001,7,18,22:40,3.1,191,989.3,27.9,89,26,0,0,302,21.8

7/18/2001,2001,7,18,22:40,3.1,207,987.6,25.7,87,23.4,141,2.7,300,18.5

7/18/2001,2001,7,18,22:40,3.2,223,985.8,25.8,87,23.5,141,2.7,300.2,18.8

7/18/2001,2001,7,18,22:40,3.2,239,984,25.9,86,23.4,130,3.7,300.5,18.6

7/18/2001,2001,7,18,22:40,3.3,256,982.1,26,86,23.5,130,3.7,300.7,18.9

7/18/2001,2001,7,18,22:40,3.3,274,980.1,26,86,23.5,120,4.7,300.9,18.8

7/18/2001,2001,7,18,22:40,3.6,294,977.9,25.9,86,23.4,120,4.7,301,18.9

7/18/2001,2001,7,18,22:40,3.6,315,975.6,25.8,86,23.3,110,5.6,301.1,18.6

7/18/2001,2001,7,18,22:40,4,336,973.2,25.6,86,23.1,110,5.6,301.1,18.6

7/18/2001,2001,7,18,22:40,4,358,970.9,25.4,86,22.9,101,6.5,301.1,18.3

7/18/2001,2001,7,18,22:40,4.3,380,968.4,25.3,86,22.8,101,6.5,301.3,18.4

7/18/2001,2001,7,18,22:40,4.3,403,965.9,25.1,86,22.6,94,7.4,301.3,18

7/18/2001,2001,7,18,22:40,4.4,425,963.4,25,86,22.5,94,7.4,301.4,18.1



Pilot Balloon Data

File #3: CIRSAN_pilot_balloon_Belterra_August_2001.csv

File #4: CIRSAN_pilot_balloon_Boim_July_2001.csv

File #5: CIRSAN_pilot_balloon_Pindobal_July_2001.csv



File format for the Pilot Balloon data files



Column,Heading,Units/format,Description,,,,,,,,,,,

1,Date,mm/dd/yyyy,Sample date,,,,,,,,,,,

2,Year,yyyy,Year sampled. All samples were collected in 2001.,,,,,,,,,,,

3,Month,mm,Month sampled. All samples included in this file were collected in August.,,,,,,,,,,,

4,Day,dd,Day sampled (day of the month),,,,,,,,,,,

5,Hour,UTC,Time at start of the sampling period in 24 hour clock. Time reported is UTC.,,,,,,,,,,,

6,Time,s,Elapsed time since the start of measurements,,,,,,,,,,,

7,Dist_EW,m,Balloon distance in meters (m) on WEST-EAST axis from launching point (negative values indicate west) at sampling point,,,,,,,,,,,

8,Dist_NS,m,Balloon distance in meters(m) on SOUTH-NORTH axis from launching point ( negative values indicate south) at sampling point,,,,,,,,,,,

9,Height,m,Balloon height in meters above ground level ( m) at sampling point,,,,,,,,,,,

10,U_windspeed,m per s,Zonal windspeed in meters per second,,,,,,,,,,,

11,V_windspeed,m per s,Meridional windspeed In meter per second,,,,,,,,,,,

12,Mag_windspeed,m per s,Wind magnitude in meters per second,,,,,,,,,,,

13,Direct_wind,degrees,Wind direction in degrees with north represented by 0 and south by 180,,,,,,,,,,,



Example data for the Pilot Balloon data files

Date,Year,Month,Day,Hour,Time,Dist_EW,Dist_NS,Height,U_windspeed,V_windspeed,Mag_windspeed,Direct_wind,,

8/3/2001,2001,8,3,14,0,-17.4,17.2,1.1,0,0,0,0,,

8/3/2001,2001,8,3,14,20,-88.2,-9.6,51.1,-4.2,-1.3,4.4,72.9,,

8/3/2001,2001,8,3,14,40,-185,-34.5,101.1,-4.7,-1.2,4.9,76,,

8/3/2001,2001,8,3,14,60,-277,-56.5,151.1,-4.6,-1,4.7,77.9,,

8/3/2001,2001,8,3,14,80,-370.5,-74.3,201.1,-4.4,-0.7,4.5,80.3,,

8/3/2001,2001,8,3,14,100,-452.9,-86.4,251.1,-3.6,-0.4,3.6,83.7,,

8/3/2001,2001,8,3,14,120,-514.5,-90.2,301.1,-2.8,-0.1,2.8,87.9,,

8/3/2001,2001,8,3,14,140,-564,-90.5,351.1,-2.2,0,2.2,89.6,,

8/3/2001,2001,8,3,14,160,-603.1,-90.9,401.1,-2,-0.1,2,86.4,,

8/3/2001,2001,8,3,14,180,-645.2,-95.6,451.1,-2.3,-0.3,2.3,82.7,,

8/3/2001,2001,8,3,14,200,-693.9,-102.4,501.1,-2.9,-0.5,2.9,81,,

8/3/2001,2001,8,3,14,220,-760,-113.7,551.1,-3.5,-0.5,3.6,81.2,,

8/3/2001,2001,8,3,14,240,-834.6,-124.1,601.1,-4,-0.4,4,84.1,,

8/3/2001,2001,8,3,14,260,-918.8,-130.1,651.1,-4.2,-0.2,4.3,87.2,,

8/3/2001,2001,8,3,14,280,-1004.4,-132.4,701.1,-4.4,0.1,4.4,91.8,,

8/3/2001,2001,8,3,14,300,-1093.9,-124.6,751.1,-4.5,0.4,4.5,94.9,,

8/3/2001,2001,8,3,15,0,-17.5,17.1,0.9,0,0,0,0,,



Sonic radar (sodar) data files:

The 35 files are named as follows: YYYYMMDD_Santarem_sodar.csv

where each file contains data for one day and

yyyy = year

mm = month

dd = day

and includes days 20010713 - 20010816.



File format for sonic radar data

Column,Heading,Units/format,Description,,,,,,,,,,,,

1,Year,,Year in which measurements were collected,,,,,,,,,,,,

2,Month,,Month in which measurements were collected,,,,,,,,,,,,

3,Day,,Day on which measurements were collected,,,,,,,,,,,,

4,Hour,,Hour at which measurement series started on a 24 hour clock. Time reported is UTC and local time is GMT -4,,,,,,,,,,,,

5,Minute,,Minute at which measurement series started on a 24 hour clock. Time reported is UTC and local time is GMT -4,,,

6,Inv_layer,m ,Inversion layer depth ,,,,,,,,,,,,

7,Alt,m ,Height above ground level,,,,,,,,,,,,

8,C_tempsquared,,Temperature structure function,,,,,,,,,,,,

9,Vel,m per s,Wind speed in meters per second,,,,,,,,,,,,

10,Dir,degrees,Wind direction ,,,,,,,,,,,,

11,Sd_dir,degrees,Wind direction standard deviation ,,,,,,,,,,,,

12,Vert_vel,m per s,Vertical velocity ,,,,,,,,,,,,

13,Sd_vert_vel,m per s,Vertical velocity standard deviation ,,,,,,,,,,,,

14,Sd_Zonal_vel,m per s,Zonal wind standard deviation ,,,,,,,,,,,,

15,Sd_meridional_vel,m per s,Meridional wind standard deviation ,,,,,,,,,,,,

16,Stability_index,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,

,missing data is represented by -9999,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,



Example data for the sonic radar data files:



Year,Month,Day,Hour,Minute,Inv_layer,Alt,C_tempsquared,Vel,Dir,Sd_dir,Vert_vel,Sd_vert_vel,Sd_Zonal_vel,Sd_meridional_vel,Stability_index

2001,7,23,0,0,1060,1200,210,17.17,73,9,-1.55,1.26,3.19,2.28,3

2001,7,23,0,0,1060,1160,206,17.51,74,11,-1.44,1.18,2.78,2,3

2001,7,23,0,0,1060,1120,204,17.5,78,14,-1.33,1.08,2.24,1.83,3

2001,7,23,0,0,1060,1080,202,15.63,83,18,-1.24,0.99,1.79,1.77,4

2001,7,23,0,0,1060,1040,198,12.11,91,21,-1.2,0.93,1.59,1.76,4

2001,7,23,0,0,1060,1000,192,7.93,104,22,-1.21,0.91,1.67,1.82,4

2001,7,23,0,0,1060,960,186,5,130,23,-1.26,0.93,1.91,1.88,5

2001,7,23,0,0,1060,920,180,4.11,157,23,-1.31,0.92,2.13,1.87,5

2001,7,23,0,0,1060,880,174,3.92,160,24,-1.34,0.89,2.26,1.85,5

2001,7,23,0,0,1060,840,168,3.89,150,25,-1.37,0.88,2.35,1.91,5



Santarem Weather Forecasts



File #41: Weather_forecasts_Santarem.txt

A txt file with all the daily observed and forecast weather descriptions for the study period.



CPTEC Analyses:

LBA-CIRSAN CPTEC/GPSA Atmospheric Analysis Data in Grib Format: 2001



Files naming conventions are as follows:

Stratospheric analyses: GPSAST</b>SYYYYMMDDHHYYYYMMDDHHP.grb

Tropospheric analyses: GPSATR</b>SYYYYMMDDHHYYYYMMDDHHP.grb



Where YYYYMMDDHH represents the date and time period included in the analysis for each file. Data are in Grib format. For the stratospheric analyses each time period has a grb file and an associated ctl file. For the tropospheric analyses each time period is represented by three files (grb, ctl and gmp). CTL files allow the grib data can be accessed by GrADS.



= Start Date: 2001-06-01

End Date: 2001-08-16



Temporal Resolution: 6-hour



If you have any questions, please contact:

saplba@master.iag.usp.br





LBA-CIRSAN Satellite Imagery, Santarem, Brazil: 2001

The satellite images are organized as the following:



claire: North/Northeastern Brazil satellite images (visible and infrared)

ir -> infrared

The files have the name in the following format:

IR-CLAIRE-yymmddhhnn.gif, where:

yy -> 2-digit year

mm -> 2-digit month

dd -> 2-digit day

hh -> 2-digit hour (GMT)

nn -> 2-digit minute

vis -> visible

The files have the name in the following format:

VIS-CLAIRE-yymmddhhnn.gif, where:

yy -> 2-digit year

mm -> 2-digit month

dd -> 2-digit day

hh -> 2-digit hour (GMT)

nn -> 2-digit minute



inpe: South American infrared satellite images, from INPE

The files have the name in the following format:

yyyymmddhhnn.gif, where:

yyyy -> 4-digit year

mm -> 2-digit month

dd -> 2-digit day

hh -> 2-digit hour (GMT)

nn -> 2-digit minute



santarem: Santarem region satellite images (visible and infrared)

ir -> infrared

The files have the name in the following format:

IR-SANTA-yymmddhhnn.gif, where:

yy -> 2-digit year

mm -> 2-digit month

dd -> 2-digit day

hh -> 2-digit hour (GMT)

nn -> 2-digit minute

vis -> visible

The files have the name in the following format:

VIS-SANTA-yymmddhhnn.gif, where:

yy -> 2-digit year

mm -> 2-digit month

dd -> 2-digit day

hh -> 2-digit hour (GMT)

nn -> 2-digit minute





master: South American infrared satellite images, from MASTER Lab. (USP)

The files have the name in the following format:

yymmddhhnn.jpg, where:

yyyy -> 4-digit year

mm -> 2-digit month

dd -> 2-digit day

hh -> 2-digit hour (GMT)

nn -> 2-digit minute

Temporal Resolution: 30 minutes (some 3 hours)



Please, contact (http://www.master.iag.usp.br/lba/) for appropriate citation before using these satellite images in publication.







Data Application and Derivation:

Upper air data such as those gathered here contribute to the understanding of the local circulation and thus to the interpretation of the tower measurements.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Radiosonde data: The data goes through three steps of quality control whereby it is screened for large errors when compared to climatology, for continuity errors in the vertical structure, superadiabatic layers and temporal continuity at each level. Flagged data are subject to further investigation and either maintained or removed according to the presence of phenomena such as cloudiness or rainfall.



Pilot Balloon Data: The vertical velocity of the balloon was previously calibrated with the use of two theodolites located at the ends of a 300m baseline and synchronous observations of elevation and azimuth angles. The payload for filling the balloon was determined as an average of several launches to give a vertical velocity of 250 meters per minute. The balloon position, obtained at 20 seconds interval from the elevation and azimuth angles, was smoothed out by a 5 point running average and then the horizontal vector components were calculated. The quality control was performed by examining the vertical continuity of zonal and meridional components. Strong

level to level variations were flagged and re-examined for indications of operational problems, such as when the lens is changed from large to small field of view or when the trajectory goes over the theodolite. When the problems encountered where defined as errors, the corresponding azimuth, elevation angles were removed and positions were calculated with the remaining

points. Finally the zonal and meridional components were interpolated to a regular 50m resolution vertical coordinate above the local surface.

Process Description:

Data Acquisition Materials and Methods:

Radiosonde:

Data were collected with a Vaisala RS-80 radiosonde. Soundings were normally launched each 6 hours (00, 06, 12, 18 UTC), or each 3 hours whenever favorable conditions to development of Tapajos river breeze or squall line approaching were observed.



Pilot balloon (Pilbal):

These data were collected during the CIRSAN experiment, in July and August 2001. Pibal sounding were performed each hour during the morning and afternoon. During the end of July, two sites in both sides of Tapajos river were operated.



Sonic Radar: Data were collected with a Remtech Acoustic Sounder-Sodar at the Santarem Airport between July 15 and August 15. Data was processed by the manufacturer\'s software(REMTECH,Inc) to produce wind profiles, acoustic echo intensity and an estimate of the lowest inversion height every 30 minutes.



Automatic Stability Classification Routine

This is a real time direct determination of stable/neutral/unstable categories as a function of height and time. Pattern recognition algorithms using echo profiles,wind, wind shear (pseudo Bulk Richardson approach).

References:

None cited

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