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Investigation:

LC-07 (Melack / Novo / Forsberg)

LBA Dataset ID:

LC07_CURUAI_CHL

Originator(s):

1. BARBOSA, C.C.F.
2. NOVO, E.M.L.M.
      3. MELACK, J.M.
4. RUDORFF, C.M.

Point(s) of Contact:

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

Dataset Abstract:

Spatially distributed measurements were made and samples for subsequent analysis were collected from Lago Curuai during four phases of the hydrological cycle. The resulting data were incorporated into three publications (see below: Barbosa et al. 2010, Novo et al. 2006 and Rudorff et al. 2011). Data from approximately 70 stations include pH, dissolved inorganic carbon, turbidty, chlorophyll, temperature, conductivity, and total and inorganic suspended matter.

Beginning Date:

2003-09-25

Ending Date:

2004-06-30

Metadata Last Updated on:

2012-10-30

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 LC-07 Water Quality, CO2, Chlorophyll, Lago Curuai, Para, Brazil: 2003-2004:  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1134

Documentation/Other Supporting Documents:

LBA-ECO LC-07 Water Quality, CO2, Chlorophyll, Lago Curuai, Para, Brazil: 2003-2004:  http://daac.ornl.gov/LBA/guides/LC07_Curuai_chl.html

Citation Information - Other Details:

Barbosa, C.C.F., E.M.L.M. Novo, J.M. Melack and C.M. Rudorff. 2012. LBA-ECO LC-07 Water Quality, CO2, Chlorophyll, Lago Curuai, Para, Brazil: 2003-2004. 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/1134

Keywords - Theme:

Parameter Topic Term Source Sensor
CARBON DIOXIDE BIOSPHERE TERRESTRIAL HYDROSPHERE LABORATORY ANALYSIS
CHLOROPHYLL BIOSPHERE VEGETATION LABORATORY SPECTROPHOTOMETER
CONDUCTIVITY BIOSPHERE TERRESTRIAL HYDROSPHERE FIELD INVESTIGATION CONDUCTIVITY METERS
DISSOLVED SOLIDS BIOSPHERE TERRESTRIAL HYDROSPHERE LABORATORY WEIGHING BALANCE
PH BIOSPHERE TERRESTRIAL HYDROSPHERE FIELD INVESTIGATION PH METER
SUSPENDED SOLIDS BIOSPHERE TERRESTRIAL HYDROSPHERE LABORATORY WEIGHING BALANCE
TURBIDITY BIOSPHERE TERRESTRIAL HYDROSPHERE FIELD INVESTIGATION TURBIDITY METERS

Uncontrolled Theme Keyword(s):  CHLOROPHYLL, DOC, TOTAL SUSPENDED SOLIDS

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
  PARA WESTERN (SANTAREM) -1.82060 -2.33890 -50.02080 -55.83470

Related Publication(s):

Barbosa, C.C.F.,E.M.L.M. Novo, J.M. Melack, M. Gastil-Buhl, W. Pereira Filho. 2010. Seasonal changes in chlorophyll distributions in Amazon floodplain lakes derived from MODIS images. Limnology 11:155-166. DOI 10.1007/s10201-009-0305-5

Novo, E.M.L.M., C.C.F Barbosa, R.M. de Freitas, Y.E. Shimabukuro, J.M. Melack and W.P Filho. 2006. Seasonal changes in chlorophyll distributions in Amazon floodplain lakes derived from MODIS images. Limnology 7: 153-161.

Rudorff, C.M., J.M. Melack, S. MacIntyre, C.C.F. Barbosa, and E.M.L.M. Novo (2011), Seasonal and spatial variability of CO2 emission from a large floodplain lake in the lower Amazon, J. Geophys. Res., 116, G04007, doi:10.1029/2011JG001699.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

Data are available in one ASCII comma separated file titled Field_measurements_Lago_Curuai.csv.



Data are organized as follows:



File name: Field_measurements_Lago_Curuai.csv,,,,,,,,,,,,,,,

File date:,2-Aug-12,,,,,,,,,,,,,,

Associated LBA Data Set Inventory ID: ,LC07_Curuai_Chl,,,,,,,,,,,,,,

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

Column Number,Column_heading,Units/format,Explanation,,,,,,,,,,,,

1,Date,YYYYMMDD,Sampling date,,,,,,,,,,,,

2,Time,HH:MM,Sampling time in local time (local time is UTC-3),,,,,,,,,,,,

3,Longitude,degree,Longitude of sampling location,,,,,,,,,,,,

4,Latitude,degree,Latitude of sampling location,,,,,,,,,,,,

5,TSS,mg per L,Total suspended solids determined in samples filtered using Whatman GF/C 47mm circles,,,,,,,,,,,,

6,ISS,mg per L,Inorganic suspended solids determined by ignition of volatile suspended solids at 480 deg. Celsius,,,,,,,,,,,,

7,OSS,mg per L,Organic suspended solids concentration was calculated as the difference between measured total suspended solids and inorganic suspended solids.,,,,,,,,,,,,

8,Chlorophyll_a,microg per L,Chlorophyll-a determined spectrophotometrically; samples filtered using Whatman GF/F 47mm circles,,,,,,,,,,,,

9,DIC,mg per L,Dissolved inorganic carbon determined using a Shimadzu TOC 5000A carbon analyzer calibrated with potassium biphthalate,,,,,,,,,,,,

10,DOC,mg per L,Dissolved organic carbon determined using a Shimadzu TOC 5000A carbon analyzer calibrated with potassium biphthalate,,,,,,,,,,,,

11,Transparency,m,Transparency measured using a 20 cm diameter Secchi disk,,,,,,,,,,,,

12,Turbidity,NTU,Turbidity measured using Horiba U-10,,,,,,,,,,,,

13,Temperature,degrees C,Temperature measured using Horiba U-10,,,,,,,,,,,,

14,pH,,pH measured using Horiba U-10,,,,,,,,,,,,

15,Conductivity,mS per cm,Conductivity measured using Horiba U-10,,,,,,,,,,,,

16,CO2,micromoles pe L,Carbon dioxide concentration calculated from pH and DIC as described in Rudorff et al. (2011).,,,,,,,,,,,,

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

,In September 2003 water was collected with a cylindrical sampler which integrated the water column from surface to the Secchi depth.

,In November 2003 and February 2004, samples were collected at subsurface (approximately 0.4 m below the surface). ,,,,,,,,,,,,,,

,In June 2004 samples were taken at 0.5 m below the surface.,,,,,,,,,,,,,,

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

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

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

Date,Time,Longitude,Latitude,TSS,ISS,OSS,Chlorophyll_a,DIC,DOC,Transparency,Turbidity,Temperature,pH,Conductivity,CO2

20030925,10:25,-55.789501,-2.20678,35.343,28.25,7.093,24.4064,17.45,18.82,0.3,123,32.5,6.45,21,607.95

20030925,12:07,-55.852402,-2.19675,94.62,59.347,35.273,205.797,4.764,9.242,0.12,205,34.7,8.37,25,3.29

20030925,12:30,-55.823399,-2.17569,49.888,40.14,9.748,47.7484,11.37,8.796,0.2,161,34.5,8.27,33,9.89

20030925,12:50,-55.8368,-2.16275,55.792,41.196,14.596,54.1705,10.35,7.447,0.2,210,35.4,8.39,33,6.77

20030925,13:40,-55.780701,-2.14625,48.01,32.818,15.192,79.5686,7.092,7.863,0.2,177,35.3,8.8,34,1.77

20030925,14:22,-55.7584,-2.16606,52.5,41.893,10.608,19.4477,10.14,8.719,0.2,131,33.4,7.51,31,49.18

20030925,15:15,-55.773602,-2.10931,68.86,50.123,18.737,65.0191,8.77,13.05,0.12,229,38,8.74,34,2.49

20030925,15:35,-55.7537,-2.09094,79.063,64.077,14.987,26.4624,12.54,7.444,0.1,260,36,6.63,35,329.18

20030926,10:05,-55.736599,-2.15489,311.37,63.63,247.74,1951.88,10.28,28.65,-9999,180,34.1,8.64,37,3.79

20030926,10:45,-55.695099,-2.14875,65.55,29.933,35.617,186.495,8.705,8.408,0.13,130,36.3,9.19,43,0.83

20030926,11:19,-55.652199,-2.14206,58.57,20.473,38.097,188.478,10.61,6.579,0.18,153,36.8,9.22,46,0.94

20030926,11:31,-55.637798,-2.11842,40.574,27.982,12.592,50.1286,14.4,-9999,0.3,140,34.7,8.6,40,5.79

20030926,12:12,-55.672798,-2.06036,58.235,44.55,13.685,60.1572,14.48,31.52,0.22,116,34.3,8.56,41,6.42

20030926,12:35,-55.665699,-2.07428,42.42,26.07,16.35,84.2056,14.2,11.86,0.28,105,34,7.32,40,102.7



Data are organized as follows:

Data Application and Derivation:

These field measured values can be used to validate remote sensing methods of measuring chlorophyll concentrations (a proxy for productivity).

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Accuracy for chlorophyll-a lab analysis was 0.1 ug/L.

Accuracy for determination of total suspended solids and inorganic suspended solids was 0.005 mg/L. Organic suspended solids concentration was calculated as the difference between total suspended solids and inorganic suspended solids.

Field and lab manipulations may change DIC concentration of water samples slightly.



Specifications of parameters measured with a routinely calibrated Horiba U-10 water quality meter:



pH: Glass electrode, resolution: 0.01 pH units, repeatability: 0.05 pH units, temperature compensation: 0-50 degrees C.



Conductivity: Alternating four-electrode, resolution: for the range of 0 to 1 uS per cm 0.01 uS per cm, for the range of 1 to 10 uS per cm 0.1 uS per cm and for the range of 10 to 100 uS per cm 1.0 uS per cm, repeatability: plus or minus 1 percent of full scale, temperature compensation: 0-50 degrees C.



Turbidity: Scattering/transmitting light, resolution: 1 NTU, repeatability: plus or minus 3 percent of full scale, temperature compensation: N/A.



Temperature: Thermister, resolution: 0.1 degree C, repeatability: plus or minus 0.3 degrees C, temperature compensation: N/A.

Process Description:

Data Acquisition Materials and Methods:

Study site:

Lago Grande de Curuai lies in the floodplain of the Amazon River to the south of Obidos, Para, Brazil. It is composed of several interconnected lakes temporarily or permanently connected to the Amazon R. by channels and overbank flow. The stage of the Amazon R. varies ca. 6 m annually in the nearby reach with a peak in June and minimum in November. The lake\'s flooded area ranges from about 850 to 2274 km2; at flood peak open-water covers about 65 percent of flooded area with flooded vegetation covering the remaining area. Water movements and mixing in L. Curuai are complex, and the effects of physical forces (e.g., wind, solar radiation, river inflows) are modified by the lake\'s surface area and depth, varying seasonally and spatially. During low water the lake becomes sufficiently shallow for sediments to be resuspended by wind-induced turbulence.



Field methods:

Four campaigns were conducted to sample limnological parameters during the four phases of inundation: receding (September 2003), low (November 2003), rising (February 2004), and high water (June 2004). Sampling stations were distributed in a dispersed spatial pattern (P < 0.01; based on the average nearest neighbor Euclidean distance test) over the main open-water region with average nearest neighbor distance of 3 km. Samples were collected between 9:00 and 15:00 (local time) over periods of 10 to 16 days.



In September 2003, water was collected with a cylindrical sampler which integrated the water column from surface to the Secchi depth measured at the sampling location. In November 2003 and February 2004, lake depth and Secchi depth were low and samples were collected at about 0.4 m below the surface. In June 2004 samples were collected at 0.5 m below the surface.



Transparency was measured using a 20 cm diameter Secchi disk. Temperature (accuracy of plus or minus 0.3 degrees C), conductivity (accuracy of plus or minus 1 percent), and pH (accuracy of plus or minus 0.05) were measured with routinely calibrated Horiba water quality sensors.



For chlorophyll determination, water samples were filtered through Whatman GF/F filters wrapped in aluminium foil and stored frozen (-20 degrees C) until the analysis was completed (up to 2 weeks later). Chlorophyll determination was performed according to Nush (1980). Filters were extracted with 80 percent ethanol at 75 degrees C for 5 min followed by submerging the tubes in water near freezing. The extracts were kept for 6 to 24 h in the refrigerator before spectrophotometric determination. Suspended inorganic particle determination

was based on Wetzel and Likens (1991). A known volume of lake water was filtered through a GF/C filter pre-ashed at 480 degrees C and preweighed. Filters were stored in desiccators over silica gel. In the laboratory, the filter was dried at 60 degrees C for 24 h and weighed to determine total suspended matter. The same filter was ashed at 480 degrees C for 1h and reweighed to determine inorganic particle concentration. For total dissolved

carbon and dissolved inorganic carbon (DIC) determination, lake water was passed through a pre-ashed Whatman GFC filter, and the filtrate was collected in 15 ml flasks and preserved with HCl. Samples were run in a combustion/nondispersive infrared gas analyzer (Shimadzu TOC 5000A) calibrated with potassium biphthalate according to APHA (1998). Dissolved organic carbon (DOC) was determined by difference between total carbon and DIC.

References:

APHA (1998) Standard methods for the examination of water and wastewater, 20th edn. American Public Health Association, Washington,DC.



Kirk JTO (1994) Light and photosynthesis in aquatic ecosystems, 2nd edn. Cambridge University Press, Cambridge



Nush EA (1980) Comparison of different methods for chlorophyll and

phaeopigment determination. Arch Hydrobiol 4:14â�â�œ36



Sippel SJ, Hamilton SK, Melack JM (1992) Inundation area and morphometry

of lakes on the Amazon River floodplain, Brazil. Arch Hydrobiol 123:385â�â�œ400



Wetzel RG, Likens GE (1991) Limnological analyses, 2nd edn. Springer, New York

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