Hydrometeorological Reconstructions for Northeastern Mongolia: Readme File
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              World Data Center for Paleoclimatology, Boulder
                                and 
                   NOAA Paleoclimatology Program
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NOTE: PLEASE CITE ORIGINAL REFERENCES WHEN USING THIS DATA!!!!!

CONTRIBUTORS: N. Pederson, G.C. Jacoby, R. D'Arrigo, B. Buckley,
Tree-Ring Laboratory, Lamont-Doherty Earth Observatory,
C. Dugarjav, Institute of Botany, Ulaanbaatar, Mongolia, and 
R. Mijiddorj, Hydrometeorological Research Institute, Ulaanbaatar, Mongolia


NAME OF DATA SET: Hydrometeorological Reconstructions for Northeastern Mongolia

IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2001-026

SUGGESTED DATA CITATION: Pederson, N., et al., 2001, 
Hydrometeorological Reconstructions for Northeastern Mongolia.  
International Tree-Ring Data Bank.  
IGBP PAGES/World Data Center for Paleoclimatology 
Data Contribution Series #2001-026.
NOAA/NGDC Paleoclimatology Program, Boulder CO, USA.

ORIGINAL REFERENCE: Pederson, N., G.C. Jacoby, R. D'Arrigo, B. Buckley,
C. Dugarjav, and R. Mijiddorj, 2001, Hydrometeorological Reconstructions 
for Northeastern Mongolia Derived from Tree Rings: AD 1651-1995. 
Journal of Climate, Volume 14, Number 5, pp. 872-881, March 2001. 

LAST UPDATE:  3/2001 (Original receipt by WDC-A Paleo)
GEOGRAPHIC REGION: Mongolia 
PERIOD OF RECORD:  1651-1995 AD

LIST OF FILES: Readme_Pederson2001.txt (this file), 
urgun_nars_precip.txt, kherlen_river_flow.txt.


DESCRIPTION:
Reconstructions of annual (prior August-current July) precipitation and streamflow, 
345 years in length (AD 1651-1995), are presented for northeastern Mongolia based 
on tree-ring width data. These precipitation and streamflow reconstructions account 
for 54% and 48% of the respective variance in instrumental data over the past 50 years. 
Variations in instrumental precipitation and streamflow are within the range of those 
reconstructed over the length of tree-ring record.  However, there appear to be more 
frequent extended wet periods during the 20th century. Multitaper spectral analysis 
revealed statistically significant peaks at 10.8 and 12.8 years for the precipitation 
reconstruction, and at 12.8 and 20.3-23.8 years for the streamflow reconstruction. 
Similarly, singular spectrum analysis identified spectral modes of variation at 
12 and 21 years for both series. These spectra resemble those found for tree-ring 
based precipitation reconstructions in central China as well as the western USA, 
and may reflect solar influences on the climate of Mongolia.