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Investigation:

LC-31 (Foley / Costa)

LBA Dataset ID:

LC31_SITE

Originator(s):

1. SANTOS, S.N.M.
      2. COSTA, M.H.

Point(s) of Contact:

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

Dataset Abstract:

SITE is a simple point model that uses an integration interval (dt) of one hour, based mostly on previously developed, but more complex, models, especially LSX, LSM and IBIS. The model is structured with a canopy layer and two soil layers, where the first layer is close to the soil surface and the second reaches 3.5 m depth. SITE is a dynamic model that incorporates nine processes: infrared radiation balance in the canopy, balance of solar radiation, aerodynamic processes, plant physiology, transpiration, balance of water intercepted by the canopy, transport of mass and energy fluxes, soil heat flux, soil moisture and carbon balance. The SITE model is used to estimate the fluxes of CO2, water and energy, is forced with hourly weather observed data (air temperature, radiation balance, precipitation, humidity, and wind speed).

Beginning Date:

2002-06-19

Ending Date:

2003-08-28

Metadata Last Updated on:

2013-07-15

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-31 Simple Tropical Ecosystem Model:  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1173

Documentation/Other Supporting Documents:

LBA-ECO LC-31 Simple Tropical Ecosystem Model:  http://daac.ornl.gov/LBA/guides/LC31_SITE.html

Citation Information - Other Details:

Santos, S.N.M., and M.H. Costa. 2013. LBA-ECO LC31 Simple Tropical Ecosystem Model. Model product. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, USA http://dx.doi.org/10.3334/ORNLDAAC/1173

Keywords - Theme:

Parameter Topic Term Source Sensor
ECOSYSTEM FUNCTIONS BIOSPHERE ECOLOGICAL DYNAMICS COMPUTER MODEL MODEL ANALYSIS
FORESTS BIOSPHERE VEGETATION COMPUTER MODEL MODEL ANALYSIS

Uncontrolled Theme Keyword(s):  CARBON FLUX, ECOSYSTEM MODEL, TROPICAL FOREST, WATER VAPOR FLUX

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
  TROPICAL AMAZONIA -2.85500 -2.85500 -54.95900 -55.03640

Related Publication(s):

Santos S.N.M and M.H. Costa. 2004. A simple tropical ecosystem model of carbon,water and energy fluxes. Ecological Modelling 176: 291-312.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

The model code is available as 1200-line FORTRAN code in the file named site.f which has two associated header files: initsite.h and vegetation_02.h. In addition the input data from the km 67 Floresta Nacional Tapajos site are available in the file named KM67.input

Data Application and Derivation:

SITE is based on previously developed models, mainly LSX (Pollard and Thompson, 1995), LSM (Bonan, 1996), IBIS (Foley et al., 1996), and SiB2 (Sellers et al., 1996), being much simpler, though.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

The data used for the initial calibration and validation of SITE are part of the research conducted by the large-scale biosphere atmosphere experiment in Amazonia (LBA), which were collected at 30-min intervals between April and September 1999, in the experimental area of the primary tropical evergreen forest in the Caxiuana Forest Reserve. The reserve has an area of approximately 33,000 ha and is located about 400 km west of Belem, Para, Brazil. A series of 28 days of data, collected during the dry season, from August 29 to September 25, 1999 (241 through 268 Julian day), was used to calibrate the model and data collected from April 16 to May 27, 1999 (106 through 147 Julian day), a total of 41 days during the wet season, were used to validate it. The measured data used for calibration and validation of the model were latent heat, sensible heat, and CO2 fluxes.



SITE is a dynamical point model that uses an integration time step (dt) of one hour, representing a point of land totally covered by an evergreen broadleaf forest. Small modifications may be necessary for the representation of other tropical ecosystems.

Process Description:

Data Acquisition Materials and Methods:

SITE is a dynamic model that incorporates several processes: canopy infrared radiation balance, solar radiation balance, aerodynamic processes, canopy physiology and transpiration, balance of water intercepted by the canopy, transport of mass and energy in the atmosphere, soil heat flux, soil water flux and carbon balance. It is structured with one canopy layer and two soil layers, and is forced by hourly data of temperature, radiation balance, precipitation, humidity and wind, and simulates the fluxes of CO2, water and energy, as well as the dynamics of carbon in the ecosystem.

References:

Bonan, G.B., 1996. A Land surface model (LSM version 1.0) for ecological, hydrological, and atmospheric studies: technical description and user\'s guide. NCAR Technical Note TN-417+STR, 150 pp



Foley, J.A., Prentice, I.C., Ramankutty, N., Levis, S., Pollard, D., Sitch, S., Haxeltine, A., 1996. An integrated biosphere model of land surface processes. Global Biogeochem. Cycles 10, 603-628.



Pollard, D., Thompson, S.L., 1995. The effect of doubling stomatal resistance in a global climate model. Global Planet. Change 10, 129-161.



Sellers, P.J., Mintz, Y., Sud, Y., Dalcher, A., 1986. A simple biosphere model (SiB) for use within general circulation models. J. Atm. Sci. 43, 505-531.

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