Introduction
Absorbed
Photosynthetically Active Radiation (FAPAR),
sometimes also called fAPAR or fPAR, is a radiation measure
which indicates the presence of vegetation and reflects
its photosynthetic activity. Spatially-detailed descriptions
of FAPAR provide information about the relative strength
and location of terrestrial carbon pools and fluxes. It
is one of the surface parameters that may be used in quantifying
the CO2 assimilation by plants and
the release of water through evapotranspiration.
ECV
fAPAR standards report
As requested
by UNFCCC SBSTA/COP for its 23rd Session in Montreal, November
2005, GTOS is undertaking the assessment of the status of
the development of standards for each of the essential climate
variables in the terrestrial domain. The following report,
documentation and other material have been compiled for
fAPAR. We very much welcome your comments and inputs in
improving and completing the analysis for fAPAR. Please
send any material and comments to the GTOS
Secretariat.
References
Listed
below are the major references that have been identified
in regards to methodology and standards for fAPAR. Please
inform us if you are aware of any other documentation or
material which could be considered.
Chen,
J. M., and J. Cihlar. 1999. BOREAS RSS-07 Regional LAI and
FPAR Images From Ten-Day AVHRR-LAC Composites. Data set.
Available on-line [http://www.daac.ornl.gov] from Oak Ridge
National Laboratory Distributed Active Archive Center, Oak
Ridge, Tennessee, U.S.A.
Fensholt,
R., Sandholt, I., and Rasmussen, M.S. 2004. Evaluation of
MODIS LAI, fAPAR and the relation between fAPAR and NDVI
in a semi-arid environment using in situ measurements. Remote
Sensing of Environment 91: 490-507.
Garrigues, S., Morisette, J., Nickeson, J., Lacaze, R.,
Fernandes, R., Yang, W., Myneni, R., Baret, F., Weiss, M.,
and Plummer, S. 2006. Leaf Area Index inter-comparison and
validation as a prototype activity for WGCV/LPV. Presented
at the WGCV Plenary, 9-12 May, Budapest, Hungary. See
document
Gobron,
N., Pinty, B., Aussedat, O., Chen, J., Cohen, W. B., Fensholt,
R., Gond, V., Hummerich, K. F., Lavergne, T., Melin, F.,
Privette, J. L., Sandholt, I., Taberner, M., Turner, D.
P., Verstraete, M. M. and Widlowski, J.-L. 2006. Evaluation
of FAPAR products for different canopy radiation transfer
regimes: Methodology and results using JRC products derived
from SeaWiFS against ground-based estimations. Journal of
Geophysical Research 111 (D13110), doi: 10.1029/2005JD006511.
Leblanc,
S.G., Chen, J.M., Fernandes, R., Deering, D.W., and Conley,
A. 2005. Methodology comparison for canopy structure parameters
extraction from digital hemispherical photography in boreal
forests. Agricultural and Forest Meteorology 129: 187–207.
Margolis,
H. 1997. Relationship between FPAR and leaf nitrogen for
black spruce, jack pine and aspen stands at the BOREAS Northern
Study Area. See
document
Myneni,
R. B., Nemani, R. R., and Running, S. W. 1997. Algorithm
for the estimation of global land cover, LAI and FPAR based
on radiative transfer models. IEEE Transactions on Geoscience
and Remote Sensing 35: 1380– 1393.
Rahman,
H., Verstraete, M., and Pinty, B. 1993. Coupled surface-atmosphere
reflectance (CSAR) model. 1: Model description and inversion
on synthetic data . Journal of Geophysical Research 98,
(D11): 20,779-20,789.
Tian,
Y., Dickinson, R. E., Zhou, L., Zeng, X., Dai, Y., Myneni,
R. B., Knyazikhin, Y., Zhang, X., Friedl, M., Yu, H., Wu,
W., and Shaikh, M. 2004. Comparison of seasonal and spatial
variations of leaf area index and fraction of absorbed photosynthetically
active radiation from Moderate Resolution Imaging Spectroradiometer
(MODIS) and Common Land. Journal of Geophysical Research
109 (D01103), doi:10.1029/2003JD003777.
Morisette, J. 2006. CEOS Land Product Subgroup Report. Presented
at the WGCV Plenary, 9-12 May, Budapest, Hungary. See
document
TOPC.
2004. Terrestrial Observation Panel for Climate Report to
WGCV 22. 22nd Meeting of the Working Group on Calibration
and Validation, 15th June, Sioux Falls, SD. See
document.
Yang,
W., Huang, D., Tan, B., Stroeve, J. C., Shabanov, N. V.,
Knyazikhin, Y., Nemani, R. R., and Myneni, R. B.. 2006.
Analysis of leaf area index and fraction vegetation absorbed
PAR products from the Terra MODIS sensor: 2000–2004.
IEEE Transactions for Geoscience and Remote Sensing 44:
1829–1842.
WMO.
2006. Guide to Meteorological Instruments and Methods of
Observation. Preliminary seventh edition. Report WMO-No.
8, Geneva, Switzerland.
Relevant
Web links
Relevant
fAPAP Web sites will be listed here. Your contributions
are welcome.
