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Investigation:

LC-04 (Foley / Costa)

LBA Dataset ID:

LC04_THMB-HYDRA_MODEL

Originator(s):

1. COE, M.T.
2. COSTA, M.H.
      3. BOTTA, A.
4. BIRKETT, C.

Point(s) of Contact:

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

Dataset Abstract:

THMB 1.2 (Terrestrial Hydrology Model with Biogeochemistry) model (formerly HYDRA) simulates the flow of water through groundwater systems, rivers, lakes and wetlands. THMB is one of the few hydrological models that simulate the complete freshwater system. THMB output includes 3 zipped data files that expand to: sflux.v2.nc, height.v2.nc, warea.v2.nc. These files are gridded files at 5-minute latitude by longitude grid (~9 km at the equator) resolution for the entire Amazon/Tocantins River basins (21S-6N; 45W-80W). They represent the mean monthly, simulated river discharge (sflux), water height (height) and inundated area (warea) for the period 1939-1998. The THMB model is thoroughly described by Coe (2000) and Coe et al., (2002). The model requires as boundary conditions: topography (from digital elevation models), evaporation from water surfaces (estimated from climate data, using a simple Penman energy balance model), surface runoff (supplied by the IBIS ecosystem model), base flow (drainage from the soil column, supplied by the IBIS ecosystem model), and precipitation (from climate data).

Beginning Date:

1939-01-01

Ending Date:

1998-12-31

Metadata Last Updated on:

2012-12-14

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-04 THMB Model Simulations for the Amazon and Tocantins Basins: 1939-1998:  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1138

Documentation/Other Supporting Documents:

LBA-ECO LC-04 THMB Model Simulations for the Amazon and Tocantins Basins: 1939-1998:  http://daac.ornl.gov/LBA/guides/LC04_THMB-HYDRA_Model.html

Citation Information - Other Details:

Coe, M.T., M.H. Costa, A. Botta, and C. Birkett. 2012. LBA-ECO LC-04 THMB Model Simulations for the Amazon and Tocantins Basins: 1939-1998. 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/1138

Keywords - Theme:

Parameter Topic Term Source Sensor
DISCHARGE/FLOW HYDROSPHERE SURFACE WATER COMPUTER MODEL MODEL ANALYSIS
INUNDATION HYDROSPHERE SURFACE WATER COMPUTER MODEL MODEL ANALYSIS
STAGE HEIGHT HYDROSPHERE SURFACE WATER COMPUTER MODEL MODEL ANALYSIS

Uncontrolled Theme Keyword(s):  AMAZON BASIN, COMPUTER MODELS, HYDROGRAPHY

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

Related Publication(s):

Coe, M.T. 2000. Modeling terrestrial hydrological systems at the continental scale: Testing the accuracy of an atmospheric GCM. Journal of Climate 13(4):686-704.

Coe, M.T., M.H. Costa, A. Botta, and C. Birkett. 2002. Long-term simulations of discharge and floods in the Amazon Basin. Journal of Geophysical Research-Atmospheres 107(D20):Article-8044.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

The data files are provided both as netCDF (.nc) and as ASCII (.asc).

The netCDF file names are:


sflux.v2.nc


height.v2.nc


warea.v2.nc





and the three corresponding ASCII file names are:





sflux.v2.asc


height.v2.asc


warea.v2.asc





These files are gridded at 5-minute latitude by longitude grid (~9 km at the equator) resolution for the entire Amazon and Tocantins River basins (21S-6N; 45W-80W). The upper left corner of the data is 21S-80W.





The files contain the mean monthly, simulated river discharge (sflux), water height (height) and inundated area (warea) for the period 1939-1998. The files contain 720 months of data (60 years, 12 months) in consecutive order from January 1939 to December 1998.

Data Application and Derivation:

The dataset was created by linked simulations using the IBIS ecosystem model (Kucharik, C.J., J.A. Foley, C. Delire, V.A. Fisher, M.T. Coe, S.T. Gower, J. Lenters, C. Molling, J.M. Norman and N. Ramankutty, 2000. Testing the performance of a dynamic global ecosystem model: Water balance, carbon balance, and vegetation structure. Global Biogeochemical Cycles 14, 795-825) and the HYDRA water transport model.





IBIS was first run on a 0.5 deg by 0.5 deg latitude/longitude grid, extending over the entire Amazon River basin (21S-6N; 45W-80W). for the period 1935-1998 to generate runoff estimates. Then the IBIS results extending from 1939 to 1998 were used in the THMB simulations along with the climate data (precipitation and estimated lake surface evaporation) to generate hourly output from THMB. This output was then averaged to monthly mean values.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Because these data files were generated by numerical models, their accuracy is dependent on the assumptions applied in these models.

Process Description:

Data Acquisition Materials and Methods:

The files are generated by THMB, a model that simulates the time-varying flow and storage of water in terrestrial hydrological systems, including rivers, wetlands, lakes, and human-made reservoirs.





THMB is described in:


- Coe, M.T. 2000. Modeling terrestrial hydrologic systems at the continental scale: Testing the accuracy of an atmospheric GCM. Journal of Climate 13, 686-704 and


- Coe, M.T., M.H. Costa, A. Botta, and C. Birkett. 2002. Long-term simulations of discharge and floods in the Amazon basin. Journal of Geophysical Research 10.1029/2001JD000740, 23 August 2002.





THMB operates at a 5-minute latitude by longitude grid (~9 km at the equator) with a 1-hour time step and requires as boundary conditions: topography (from digital elevation models), evaporation from water surfaces (estimated from climate data, using a simple Penman energy balance model), surface runoff (supplied by IBIS), base flow (drainage from the soil column, supplied by IBIS), and precipitation (from climate data).

References:

None.

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