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Title: WRRCTMR No.77 Spectral Analysis of Hawai'i Rainfall 
Author: Chiang, Shan-hsin; Chang, Jen-hu; Fok, Yu-Si
Date: 1985-08
Publisher: Water Resources Research Center, University of Hawaii at Manoa
Citation: Chiang SH, Chang JH, Fok YS. 1985. Spectral analysis of Hawai'i rainfall. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC technical memorandum report, 77.
Abstract: The empirical orthogonal function was applied to analyze 40-yr annual rainfall data for 80 stations in the state of Hawaii, which included 21 stations on Hawaii, 18 on Maui, 5 on Molokai, 5 on Lanai, 16 on Oahu, and 15 on
Kauai. The chi-square statistic was introduced to test the stabilities of
eigenvectors, E-1, E-2, and E-3, for the state and its six major islands.
The eigenvectors, especially E-1 and E-2, for the state and individual islands are quite stable within the 30-yr period. Eigenvectors within the 30-yr period with 5-yr data change are more stable than those within a 30-yr
period with 10-yr data change. The 40-yr eigenvectors are even more stable than those in the 30-yr period. Both the maximum and conventional power spectral analyses were used to analyze the time-dependent coefficients of E-l, E-2, and E-3. The quasi-biennial oscillation (2-yr cycle) is the predominant cycle for the state and for Maui and Oahu. The El Nino cycle (4- to 4.4-yr cycle) exists in the state and the islands of Hawaii and Kauai, and the 3- to 3.3-yr cycle on Kauai. No significant sunspot cycle (11- and 22-yr cycle) was found on Hawaii.
Series/Report No.: WRRC Technical Memorandum Report
Sponsorship: Hawaii State General Fund Project No. ASP-204
Pages/Duration: ix + 36 pages
Keywords: rainfall, spectral analysis, climatology, precipitation, empirical orthogonal function, eigenvectors, maximum entropy power spectrum, rainfall periodicities, Kauai, Oahu, Maui, Molokai, Lanai, Hawaii
LC Subject Headings: Rain and rainfall -- Hawaii.

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