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Investigation:

LC-04 (Foley / Costa)

LBA Dataset ID:

LC04_IBIS_MODEL

Originator(s):

1. BOTTA, A.
2. RAMANKUTTY, N.
      3. FOLEY, J.A.

Point(s) of Contact:

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

Dataset Abstract:

This data set was generated by the terrestrial ecosystem model IBIS (Foley et al. 1996, Kucharik et al. 2000) using the CRU05 climate record (News et al. 2000). It includes the annual net ecosystem exchange of the surface (neetot), the microbial respiration (co2mic), the root respiration (co2root), and the total soil respiration (co2soi=co2mic+co2root). These fluxes are in kilogram of carbon per meter square per year (kg-C/m2/yr). The spatial resolution is 0.5 degree longitude by latitude, and the data set covers the entire Amazon and Tocantins basins (80W/45.5W, 5.5N/21S).

Beginning Date:

1921-01-01

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 IBIS Model Simulations for the Amazon and Tocantins Basins: 1921-1998:  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1139

Documentation/Other Supporting Documents:

LBA-ECO LC-04 IBIS Model Simulations for the Amazon and Tocantins Basins: 1921-1998:  http://daac.ornl.gov/LBA/guides/LC04_IBIS_Model.html

Citation Information - Other Details:

Botta, A., N. Ramankutty, and J.A. Foley. 2012. LBA-ECO LC-04 IBIS Model Simulations for the Amazon and Tocantins Basins: 1921-1998. 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/1139

Keywords - Theme:

Parameter Topic Term Source Sensor
BIOGEOCHEMICAL CYCLES BIOSPHERE ECOLOGICAL DYNAMICS COMPUTER MODEL ANALYSIS
CARBON DIOXIDE BIOSPHERE ECOLOGICAL DYNAMICS COMPUTER MODEL ANALYSIS
FIRE OCCURRENCE BIOSPHERE ECOLOGICAL DYNAMICS COMPUTER MODEL ANALYSIS
PRIMARY PRODUCTION BIOSPHERE ECOLOGICAL DYNAMICS COMPUTER MODEL ANALYSIS

Uncontrolled Theme Keyword(s):  CO2 FLUXES, COMPUTER MODEL, FIRE DYNAMICS, NET ECOSYSTEM EXCHANGE, NET PRIMARY PRODUCTIVITY, RESPIRATION

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
  AMAZON BASIN 6.00000 -21.00000 -45.00000 -80.00000

Related Publication(s):

Botta, A. and J.A. Foley. 2002. Effects of climate variability and disturbances on the Amazonian terrestrial ecosystems dynamics. Global Biogeochemical Cycles 16(4).

Botta, A., N. Ramankutty, and J.A. Foley. 2002. Long-term variations of climate and carbon fluxes over the Amazon basin. Geophysical Research Letters 29(9):Article-1319.

Foley, J.A., I.C. Prentice, N. Ramankutty, S. Levis, D. Pollard, S. Sitch, and A. Haxeltine. 1996. An integrated biosphere model of land surface processes, terrestrial carbon balance, and vegetation dynamics. Global Biogeochemical Cycles 10(4):603-628.

Kucharik, C.J., J.A. Foley, C. Delire, V.A. Fisher, M.T. Coe, J.D. Lenters, C. Young-Molling, N. Ramankutty, J.M. Norman, and S.T. Gower. 2000. Testing the performance of a Dynamic Global Ecosystem Model: Water balance, carbon balance, and vegetation structure. Global Biogeochemical Cycles 14(3):795-825.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

Data files were generated from the IBIS model (Foley et al. 1996, Kucharik et al. 2000), which was run using CRU05 climate data (New et al. 2000).


- The spatial resolution is 0.5x0.5 degrees covering the domain 80W/45.5W, 5.5N/21S.


- This simulation covers the period January 1921-December 1998 (following a 320-year spin-up procedure with a surrogate variable climate).


- Because CRU climate records are not reliable prior to 1930, we would advise only using results from years 1935-1995 (allowing for a 5-year characteristic time-scale of the deep soil).


- The files consist of either annual or monthly means from 1921 to 1998 in consecutive order.


- The time column states whether the file is annual mean or monthly mean.


- The column labeled nb is the number of time layers in the file. Therefore, for an annual file nb=78 indicates 78 years of data from 1921-1998. For a monthly file nb=936 (75 years x 12 months) starting in 1921, ending in 1998.


- The outputs are stored in netcdf format (.nc) compressed using gzip.




Compressed file names are shown in parenthesis with the expanded file names beneath them.


(compressed),expanded file name,time,nb,variable,units,definition


(AETA.GZ),aet.nc,annual,78,aet,mm/yr,annual average evapo-transpiration


(BIOMASSA.GZ),biomass.nc,annual,78,biomass,kg-C/m2,annual biomass of carbon for each pft


(BIOMASSA.GZ),biomass.nc,annual,78,totbiou,kg-C/m2,annual biomass of carbon for upper canopy


(BIOMASSA.GZ),biomass.nc,annual,78,totbiol,kg-C/m2,annual biomass of carbon for lower canopy


(CSOIA.GZ),csoi.nc,annual,78,rootbio,kg-C/m2,annual total alive root biomass carbon


(CSOIA.GZ),csoi.nc,annual,78,totalit,kg-C/m2,annual total above ground litter carbon


(CSOIA.GZ),csoi.nc,annual,78,totrlit,kg-C/m2,annual total below ground litter carbon


(CSOIA.GZ),csoi.nc,annual,78,totcsoi,kg-C/m2,annual total soil carbon w/o litter


(CSOIA.GZ),csoi.nc,annual,78,totcmic,kg-C/m2,annual total microbial carbon


(CO2FA.GZ),co2fluxes.nc,annual,78,gpptot,kg-C/m2,annual total gross primary productivity of carbon


(CO2FA.GZ),co2fluxes.nc,annual,78,neetot,kg-C/m2,annual total net ecosystem exchange carbon


(CO2FA.GZ),co2fluxes.nc,annual,78,co2mic,kg-C/m2,annual total microbial respiration carbon


(CO2FA.GZ),co2fluxes.nc,annual,78,co2root,kg-C/m2,annual total root respiration carbon


(CO2FA.GZ),co2fluxes.nc,annual,78,co2soi,kg-C/m2,annual total soil respiration carbon


(FireA.GZ),disturbf.nc,annual,78,disturbf,fraction,annual burned fraction of the grid-cell


(FireA.GZ),disturbf.nc,annual,78,cdisturb,kg-C/m2/yr,annual total carbon lost from fire

Data Application and Derivation:

This data set can be used as input, development, and validation of similar models.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Because CRU climate records are not reliable prior to 1930, we would advise only using results from years 1935-1995 (allowing for a 5-year characteristic time-scale of the deep soil).



These data files are generated by numerical models, therefore their accuracy is dependent on the assumptions applied in these models.

Process Description:

Data Acquisition Materials and Methods:

These files were generated from the IBIS model (Foley et al. 1996, Kucharik et al. 2000), which was run using CRU05 climate data (New et al. 2000).

References:

Foley, J.A., I.C. Prentice, N. Ramankutty, S. Levis, D. Pollard, S. Sitch, and A. Haxeltine. 1996. An integrated biosphere model of land surface processes, terrestrial carbon balance, and vegetation dynamics. Global Biogeochemical Cycles 10(4):603-628.



Kucharik, C.J., J.A. Foley, C. Delire, V.A. Fisher, M.T. Coe, J.D. Lenters, C. Young-Molling, N. Ramankutty, J.M. Norman, and S.T. Gower. 2000. Testing the performance of a Dynamic Global Ecosystem Model: Water balance, carbon balance, and vegetation structure. Global Biogeochemical Cycles 14(3):795-825.



New, Mark, Mike Hulme, and Phil Jones. 2000. Representing Twentieth-Century Space-Time Climate Variability. Part II: Development of 1901-96 Monthly Grids of Terrestrial Surface Climate. Journal of Climate 13:2217-2238.

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