 Nawiliwili  Honolulu  Hilo

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Presentation transcript:

 Nawiliwili  Honolulu  Hilo Tide and Sea Level Trends for the State of Hawaii Source: www.tidesandcurrents.noaa.gov Tides: under “Products”  “Tides”  “Observed Data-Active Stations” Sea Level: under “Products”  “Sea Level Trends” “CO-OPS Stations” Hawaii Stations Considered: Hilo Honolulu Nawiliwili  Nawiliwili  Honolulu Group 1 Clint Conrad  Hilo

Hilo 1 Week of Data: Very similar trends for each station: Mostly Diurnal (1/day), Some semidiurnal (2/day) Amplitude of tidal variation: About 2-3 feet Amplitude of sea level anomaly: About 0.25 feet (a few inches) Honolulu Nawiliwili

Long-Term Sea Level Trends: State of Hawaii Nawiliwili: Sea Level Rise = 1.5 mm/yr (45 years)

Long-Term Sea Level Trends: State of Hawaii Honolulu: Sea Level Rise = 1.5 mm/yr (94 years)

Long-Term Sea Level Trends: State of Hawaii Hilo: Sea Level Rise = 3.4 mm/yr (72 years)

Summary: State of Hawaii Short-Term Tidal Variations:  Mostly diurnal, a few feet in amplitude  Tidal fluctuations are similar across Hawaii  Water level anomalies are small: only a few inches Long-Term Sea Level Change:  Honolulu and Nawiliwili show 1.5 mm/yr of sea level rise during the last century  Hilo is anomalous: 3.4 mm/yr of sea level rise  Hilo’s larger rise might be due to: Gap in tide gauge data? Something to do with big island volcanism?