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Investigation:

LC-02 (Brown / Silveira / Esteves)

LBA Dataset ID:

LC02_WATER_TABLE_ACRE

Originator(s):

1. SELHORST, D.
      2. BROWN, I.F.

Point(s) of Contact:

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

Dataset Abstract:

Predicted climate scenarios for the Amazon region suggest an increase in the proportion of the area deforested and a shift in temperature regime due to the greenhouse effect. We know that Amazonian forests play a critical role in regulating the amount of rainfall in this and other regions. Deforestation in the area could result in diminished rainfall or an alteration in the pattern of rainfall distribution. To understand the effects of these potential changes it is important to have a clear understanding of seasonal patterns in various components of the the water cycle in Amazonian forests. Here we report monthly watertable levels for three wells located in a forest fragment on the Catuaba Experimental Farm which is the property of the Federal University of Acre. Data were collected between February 1999 and December 2004.

Beginning Date:

1999-02-12

Ending Date:

2004-12-22

Metadata Last Updated on:

2012-02-15

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-02 Groundwater Levels, Catuaba Experimental Farm, Acre, Brazil: 1999-2004:  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1062

Documentation/Other Supporting Documents:

LBA-ECO LC-02 Groundwater Levels, Catuaba Experimental Farm, Acre, Brazil: 1999-2004:  http://daac.ornl.gov/LBA/guides/LC02_Water_Table_Acre.html

Citation Information - Other Details:

Selhorst, D. and I.F. Brown. 2012. LBA-ECO LC-02 Groundwater Levels, Catuaba Experimental Farm, Acre, Brazil: 1999-2004. 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/1062

Keywords - Theme:

Parameter Topic Term Source Sensor
WATER DEPTH HYDROSPHERE SURFACE WATER FIELD INVESTIGATION WATER LEVEL GAUGE

Uncontrolled Theme Keyword(s):  ACRE, AMAZON, WATER CYCLE, WATER TABLE

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
Acre Catuaba Experimental Farm -10.07300 -10.07300 -67.62900 -67.62900

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

Data are presented in one comma-separated ASCII file:

LC02_Water_Table_Depth_Catauba.csv



Column Variable Units/format Variable description

Number Name

1 Date mm/dd/yyyy Sampling date

2 Year yyyy Year of sampling

3 Month mm Month of sampling

4 Day dd Sampling day of the month

5 North_depth cm Depth to water table in centimeters at the north well

(67 37 45 W, 10 03 51 S)

6 South_depth cm Depth to water table in centimeters at the south well

(67 37 25 W, 10 04 59 S)

7 Center_depth cm Depth to water table in centimeters at the center well

(67 37 37 W, 10 04 24 S)



Missing data is represented by -9999




Example data records:



Date,Year,Month,Day,North_depth ,South_depth ,Center_depth

2/12/1999,1999,2,12,1020,659,823

2/25/1999,1999,2,25,1017,373,491

3/12/1999,1999,3,12,611,518,370

3/25/1999,1999,3,25,591,341,523

4/15/1999,1999,4,15,585,327,506

5/4/1999,1999,5,1,617,350,535

5/19/1999,1999,5,19,641,365,546

6/2/1999,1999,6,2,657,397,558

6/18/1999,1999,6,18,702,442,588

7/1/1999,1999,7,1,685,420,563

7/16/1999,1999,7,16,807,517,658

7/29/1999,1999,7,29,825,549,686

8/3/1999,1999,8,3,843,567,700

8/5/1999,1999,8,5,849,575,708

Data Application and Derivation:

Seasonal patterns in water table depths provide insight into water availability in Amazonian forests and its potential role in limiting productivity. Forests play a key role in cycling water and regulating rainfall over the Amazon Basin and future scenarios for the region include reduced rainfall as a direct effect of deforestation as well as potentially increased evapotranspiration due to elevated temperatures. Our understanding of the role of soil water in regulating productivity and the relationship between soil water pools, productivity and rainfall patterns is hampered by limited data on water table fluctuations at the seasonal scale.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

The data have been reviewed and there are no known problems at this time.

Process Description:

Data Acquisition Materials and Methods:

Study area



The sampling wells were installed at the Catuaba Experimental Farm, a Federal University of Acre property in the east of Acre State. The farm is part of a forest fragment which covers approximately 1500 ha with open forest mixed with bamboo the dominant forest type. Soils are Oxisols ( latossolo vermelho amarelo distrofico in the Brazilian classification system).



Field methods

In a 10 hectare permanent plot 3 wells were installed. Each well was drilled until reaching the water table ( approximately 10 meters depth) and then fitted with a perforated PVC tube which permitted infiltration of water from the soil. Water level was measured biweekly between Feb 1999 and August 2000 and on a monthly basis between September 2000 and December 2004.

References:

No references cited.

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