HR: 17:45h
AN: H24B-08    [Abstracts]
TI: Hilbert-Empirical Mode Decomposition (EMD) analysis of the Pacific Decadal Oscillation (PDO) and western U.S streamflow
AU: Dracup, J A
EM: dracup@ce.berkeley.edu
AF: Department of Civil & Environmental Engineering, University of California, Berkeley, 760 Davis Hall, Dept. of Civil & Environmental Engineering, Univerity of California, Berkeley, CA 94720 United States
AU: * Leonardson, R
EM: rebeccal@ce.berkeley.edu
AF: Department of Civil & Environmental Engineering, University of California, Berkeley, 760 Davis Hall, Dept. of Civil & Environmental Engineering, Univerity of California, Berkeley, CA 94720 United States
AB: The Pacific Decadal Oscillation (PDO) Index and streamflow in the United States are studied to find temporal patterns on a range of scales. The Hilbert-EMD technique is used on monthly PDO data and on reconstructed uninhibited daily flow data. Hilbert-EMD analysis uses Empirical Mode Decomposition (EMD) to separate the data into sub-signals of various frequency ranges (such as weekly, inter-annual, and decadal), and a residue displaying a long-term trend. The modes are then analyzed using the Hilbert Transform, to determine power and time characteristics of the frequency sub-signals. Hilbert-EMD analysis has been used to study a wide variety of signals from within the geophysical record, including climate variability, earthquakes, and ocean waves. This project displays the temporal patterns of the PDO Index and streamflow at varying scales, and allows correlation analysis of individual frequency modes between the PDO and a number of major US rivers.
DE: 1833 Hydroclimatology
DE: 1860 Runoff and streamflow
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting