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J. Knepil (1983)
Water balance.Nursing mirror, 157 5
Karl Karl (1986)
The Sensitivity of the Palmer Drought Severity Index and Palmer's Z‐Index to Their Calibration Coefficients Including Potential EvapotranspirationJ. Clim. Appl. Meteor., 25
T. Karl (1986)
The Sensitivity of the Palmer Drought Severity Index and Palmer's Z-Index to their Calibration Coefficients Including Potential EvapotranspirationJournal of Applied Meteorology, 25
W. Alley (1984)
The Palmer Drought Severity Index: Limitations and AssumptionsJournal of Applied Meteorology and Climatology, 23
T. Karl (1983)
Some Spatial Characteristics of Drought Duration in the United States, 22
B. Eder, Jerry Davis, J. Monahan (1987)
Spatial and temporal analysis of the palmer drought severity index over the south-eastern United StatesInternational Journal of Climatology, 7
Alley Alley (1984)
The Palmer Drought Severity Index: Limitations and AssumptionsJ. Clim. Appl. Meteor., 23
ABSTRACT: The sensitivity of the Palmer Hydrologic Drought Index to departures from average temperature and precipitation conditions is examined. A time series of zero index values was calculated and then one monthly temperature or precipitation value was perturbed. The resulting time series shows the effects on the index of one anomalous value. Independent series were calculated for temperature anomalies of plus and minus 1, 3, 5, and 10F and for precipitation anomalies of 25, 50, 75, 125, 150, and 200 percent of normal for each calendar month for Colorado, Indiana, Nevada, New York, Oklahoma, South Carolina, South Dakota, Washington, and Wisconsin. Analysis of the time series showed that the period of time required for the index to reflect actual rather than artificial initial conditions could be more than four years. It was also found that the effects of temperature anomalies are insignificant compared to the effects of precipitation anomalies. In some cases, one anomalous precipitation value could result in established wet or dry spells that last for up to two years. Although not examined in detail, the time series suggest that distributions of index values may be asymmetrical and possibly bimodal.
Journal of the American Water Resources Association – Wiley
Published: Oct 1, 1991
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