51101
DESCRIPTION
Station 51101 NDBC Location: 24.321N 162.058W. Station 51201 Pacific Islands Ocean Observing System Location: 21.669N 158.12W. 51101. 51201. Image and data source http://www.ndbc.noaa.gov/obs.shtml. Station 51101 NDBC Location: 24.321N 162.058W. - PowerPoint PPT PresentationTRANSCRIPT
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51101
51201
Image and data source http://www.ndbc.noaa.gov/obs.shtml
Station 51201 Pacific Islands Ocean Observing System Location: 21.669N 158.12WStation 51101 NDBC Location: 24.321N 162.058W
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Station 51201 Pacific Islands Ocean Observing System Location: 21.669N 158.12WStation 51101 NDBC Location: 24.321N 162.058W
Right- skewed distributionWith long tail towards highwaves
~hourly data reporting Significant wave heightsDecember 2013-Feburary 2014
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Station 51201 Pacific Islands Ocean Observing System Location: 21.669N 158.12WStation 51101 NDBC Location: 24.321N 162.058W
Less skewed distribution than wave heights.
~hourly data reporting Dominant Period in the SwellDecember 2013-Feburary 2014
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Image and data source http://www.ndbc.noaa.gov/obs.shtml
Station 51201 Pacific Islands Ocean Observing System Location: 21.669N 158.12WStation 51101 NDBC Location: 24.321N 162.058W
5120151101
30ft open ocean swell on Jan 22nd, 2014
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Image: http://www.petethomasoutdoors.com/2014/01/giant-swell-slams-hawaii-up-next-is-california-and-mavericks-big-wave-surf-contest.html
http://petethomas.typepad.com/.a/6a0120a77b966b970b01a73d5e76e3970d-pi
“The National Weather Service said around 9 a.m. Buoy [51]101, […],reported an ocean swell of 31 feet at 17 seconds. That translates to 50+ feet on the north shore[Buoy 51201] around 7 p.m.”
(http://www.hawaiinewsnow.com/story/24509382/forecasters-issue-high-surf-warning-predict-40-50-foot-waves)
40-50ft waves at reefs
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(http://www.hawaiinewsnow.com/story/24509382/forecasters-issue-high-surf-warning-predict-40-50-foot-waves)
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(http://www.hawaiinewsnow.com/story/24509382/forecasters-issue-high-surf-warning-predict-40-50-foot-waves)
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(http://www.hawaiinewsnow.com/story/24509382/forecasters-issue-high-surf-warning-predict-40-50-foot-waves)
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Image and data source http://www.ndbc.noaa.gov/obs.shtml
Station 51201Pacific Islands Ocean Observing System Location: 21.669N 158.12WStation 51101NDBCLocation: 24.321N 162.058W
5120151101
30ft open ocean swell on Jan 22nd, 2014!
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Exploring relationships between two (or more) variables
At a location two variables form a pair of coordinates (each sample point in the time seriesbecomes a point in the 2-dimensional space).
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Exploring relationships between two(or more) variables
At a location two variables form a pair of coordinates (each sample point in the time seriesbecomes a point in the 2-dimensional space).
Scatter plots can help to detect outliers, or different cluster groups in data samples
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Exploring relationships between two (or more) variables
Here the same variable (significant wave heights, left; dominant wave periods, right) from two different observing stations are plotted in a scatter-plot
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Exploring relationships between two (or more) variables
Here the same variable (significant wave heights, left, dominant wave periods) from two different observing stations are plotted in a scatter-plot
Buoy NW of Hawaii haslarge waves when waves in Hawaii are (still) small
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Exploring relationships between two(or more) variables
The buoy data are shifted by 12 hours(+12h lag in the buoy data from Hawaii)
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500 km
51101
51201
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Swell direction
Swell direction
12h shift: Correlation Is maximum when we shiftthe time series by two 12h
500 km
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Swell direction
Swell direction
12h shift: Correlation Is maximum when we shiftthe time series by two 12h
500 km
Ocean Wave Theory:
t=4 *pi *X/(gT)
Distance X= 500kmPeriod: T=17sg=9.81m/s^2=> Travel time t approx 11h