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Tree-ring carbon isotope data and drought maps
for the U.S. Southwest

Cook, E.R., Meko, D.M., Stahle, D.W. and Cleaveland, M.K., 1999.
Drought reconstructions for the continental United States.
Journal of Climate 12: 1145-1162.

Francey, R.J. and Farquhar, G.D., 1982.
An explanation of 13C/12C variations in tree rings.
Nature 297: 28-31.

Friedl, M., McIver, D.K., Hodges, J.C.F., Zhang, X.Y., Muchoney, D., Strahler, A.H., Woodcock, C.E., Gopal, S., Schneider, A., Cooper, A., Baccini, A., Gao, F. and Schaaf, C., 2002.
Global land cover mapping from MODIS: algorithms and early results.
Remote Sensing of Environment 83 (1): 287-302.

Dupouey, J.-L., Leavitt, S., Choisnel, E. and Jourdain, S., 1993.
Modelling carbon isotope fractionation in tree rings based on effective evapotranspiration and soil water status.
Plant, Cell and Environ. 16: 939-947.

Hansen, M.C., DeFries, R.S., Townshend, J.R.G., Dimiceli, C., Carroll, M. and Sohlberg, R., 2003.
Global eprcent tree cover at a spatial resolution of 500 meters: First results of the MODIS vegetation continuous fields algorithm.
Earth Interactions 7 (10): 1-15.

Hemming, D.L., Switsur, V.R., Waterhouse, J.S., Heaton, T.H.E. and Carter, A.H.C., 1998.
Climate variation and the stable carbon isotope composition of tree ring cellulose:
an intercomparison of Quercus robur, Fagus sylvatica and Pinus silvestris.
Tellus 50B: 25-33.

Lawrence, P.J. and Chase, T.N., 2006.
Representing a MODIS consistent land surface in the community land model (CLM 3.0).
Journal of Geophysical Research, Biogeosciences In Press.

Leavitt, S. W., 1993.
Seasonal 13C/12C changes in tree rings: species and site coherence, and a possible drought influence.
Can. J. For. Res. 23: 210-218.

Leavitt, S.W. and Long, A., 1985.
The global biosphere as net CO2 source or sink: evidence from carbon isotopes in tree rings.
In Planetary Ecology, Caldwell, D.E., Brierly, J.A. and Brierly, C.L., eds.
Van Nostrand Reinhold Company, New York, p. 89-99.

Leavitt, S.W. and Long, A., 1986.
Trends of 13C/12C ratios in pinyon pine tree rings of the American southwest and the global carbon cycle.
Radiocarbon 28: 376-382.

Leavitt, S.W. and Long, A. 1988.
Stable carbon isotope chronologies from trees in the southwestern United States.
Global Biogeochemical Cycles 2: 189-198.

Leavitt, S.W. and Long, A. 1989a.
Drought indicated in carbon-13/carbon-12 ratios of southwestern tree rings.
Water Resources Bulletin 25: 341-347.

Leavitt, S.W. and Long, A., 1989b.
The atmospheric d13C record as derived from 56 pinyon trees at 14 sites in the southwestern U.S.
Radiocarbon 31: 469-474.

Leavitt, S. W., W. E. Wright, and Long, A., 2002.
Spatial expression of ENSO, drought and summer monsoon in seasonal d13C of ponderosa pine tree rings in southern Arizona and New Mexico.
J. Geophys. Res. 107(D18), 4349, doi:10.1029/2001JD001312.

Ramankutty, N. and Foley, J.A., 1999.
Estimating Historical Changes in Global Land Cover: Croplands from 1700 to 1992.
Global Biogeochemical Cycles 13 (4): 997-1027.

Saurer, M. and Siegenthaler, U. 1989.
13C/12C ratios in tree are sensitive to relative humidity.
Dendrochronologia 7: 9-13.

Saurer, M., Siegenthaler, U. and Schweingruber, F., 1995.
The climate-carbon isotope relationship in tree rings and the significance of site conditions.
Tellus 47B: 320-330.

Siebert, S., Doll, P., Feick, S., and Hoogeveen, 2006.
Global map of irrigated areas version 4.0,
Johann Wolfgang Goethe University, Frankfurt am Main, Germany
Food and Agriculture Organization of the United Nations, Rome, Italy.
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