SACRAMENTO RIVER FLOW RECONSTRUCTED TO A.D. 869 FROM TREE RINGS 1

ABSTRACT: A time series of annual flow of the Sacramento River, California, is reconstructed to A.D. 869 from tree rings for a long-term perspective on hydrologic drought. Reconstructions derived by principal components regression of flow on time-varying subsets of tree-ring chronologies account for 64 to 81 percent of the flow variance in the 1906 to 1977 calibration period. A Monte Carlo analysis of reconstructed n-year running means indicates that the gaged record contains examples of drought extremes for averaging periods of perhaps = 6 to 10 years, but not for longer and shorter averaging periods. For example, the estimated probability approaches 1.0 that the flow in A.D. 1580 was lower than the lowest single-year gaged flow. The tree-ring record also suggests that persistently high or low flows over 50-year periods characterize some parts of the long-term flow history. The results should contribute to sensible water resources planning for the Sacramento Basin and to the methodology of incorporating tree-ring data in the assessment of the probability of hydrologic drought.

[1]  Richard F. Gunst,et al.  Applied Regression Analysis , 1999, Technometrics.

[2]  Mike Hulme,et al.  Calculating regional climatic time series for temperature and precipitation: Methods and illustrations , 1996 .

[3]  E. Cook,et al.  Potomac River Streamflow Since 1730 as Reconstructed by Tree Rings , 1983 .

[4]  D. Meko,et al.  TREE-RING RECONSTRUCTION OF UPPER GILA RWER DISCHARGE1 , 1995 .

[5]  David W. Stahle,et al.  Tree ring analysis of surplus and deficit runoff in the White River, Arkansas , 1989 .

[6]  M. Hughes,et al.  A 396‐YEAR RECONSTRUCTION OF PRECIPITATION IN SOUTHERN JORDAN 1 , 1999 .

[7]  Lisa J. Graumlich,et al.  A 1000-Year Record of Temperature and Precipitation in the Sierra Nevada , 1993, Quaternary Research.

[8]  R. Holmes,et al.  Tree-Ring Chronologies of Western North America: California, Eastern Oregon and Northern Great Basin with Procedures Used in the Chronology Development Work Including Users Manuals for Computer Programs COFECHA and ARSTAN , 1986 .

[9]  Charles W. Stockton,et al.  Reconstructed Stream Flow for the Salt and Verde Rivers From Tree‐Ring Data , 1981 .

[10]  M. Hughes,et al.  Extremes of moisture availability reconstructed from tree rings for recent millennia in the great basin of western north America , 1998 .

[11]  M. Hughes,et al.  Drought frequency in central California since 101 B.C. recorded in giant sequoia tree rings , 1992 .

[12]  Michael D. Dettinger,et al.  North–South Precipitation Patterns in Western North America on Interannual-to-Decadal Timescales , 1998 .

[13]  S. Stine,et al.  Extreme and persistent drought in California and Patagonia during mediaeval time , 1994, Nature.

[14]  Edward R. Cook,et al.  SPATIAL REGRESSION METHODS IN DENDROCLIMATOLOGY: A REVIEW AND COMPARISON OF TWO TECHNIQUES , 1994 .

[15]  J. Michaelsen.  Cross-Validation in Statistical Climate Forecast Models , 1987 .

[16]  A. C. Rencher,et al.  Inflation of R2 in Best Subset Regression , 1980 .

[17]  M. Hughes,et al.  Multimillennial dendroclimatic studies from the western United States , 1996 .