Estimation of Long-Term Variability of Wave Climate Around the Coastal Sea Areas of Japan

Hatada, Yoshio; Yamaguchi, Masataka

doi:10.1142/9789812791306_0006

Cited by 4 publications

(3 citation statements)

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“…In addition, understanding the changes in wave climate gives a better understanding on the future wave climate in the greenhouse‐gas‐induced global warming. Although there have been many studies on the changes in the wintertime wave climate in the North Atlantic [ WASA group , 1998; Wang and Swail , 2001] and the North Pacific [ Allan and Komar , 2000; Graham and Diaz , 2001; Wang and Swail , 2001; Hatada et al , 2001, 2002], the changes in the summertime wave climate have not been fully investigated. In the western North Pacific, the summertime wave climate is characterized by calm sea due to the moderate surface winds associated with the Pacific high and severe high waves caused by tropical cyclones (TCs).…”

Section: Introductionmentioning

confidence: 99%

Recent increase in summertime extreme wave heights in the western North Pacific

Sasaki

Iwasaki

Matsuura

et al. 2005

Geophysical Research Letters

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Recent increase in summertime extreme wave heights (H10, June–August average of the highest 10% of significant wave heights at each month) in the western North Pacific is found by applying an empirical orthogonal function analysis to H10 derived from 3rd–generation wave model forced by 6‐hourly sea surface wind fields of NCEP‐NCAR reanalysis over the period 1980–2004. The leading principal component of H10 demonstrates that the highest four years of H10 during 1980–2004 occurred in the last 10 years. It is found that the recent increase in H10 corresponds to the recent increase in total duration of intense tropical cyclones (ITC, with central pressure below 980 hPa) in the western North Pacific. Time series of the total duration of ITC reveals that the highest three years of the total duration of ITC during the last three decades occurred in the last 10 years.

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Section: Introductionmentioning

confidence: 99%

Recent increase in summertime extreme wave heights in the western North Pacific

Sasaki

Iwasaki

Matsuura

et al. 2005

Geophysical Research Letters

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“… Wang and Swail [2001], applying the empirical orthogonal functions on the global wave hindcast data, report an upward trend in the extreme significant wave heights for the winter mean over the North Atlantic and Pacific since 1960. There are several reports on the analyses of long‐term trends in observed significant wave heights around Japan [ Hatada et al , 2001, 2002].…”

Section: Introductionmentioning

confidence: 99%

Changes in wave climate off Hiratsuka, Japan, as affected by storm activity over the western North Pacific

et al. 2005

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[1] Changes in wave climate off Hiratsuka during 1980-2003 are investigated on the basis of hourly observed wave and atmospheric data obtained at a tower 1 km off Hiratsuka in Sagami Bay, Japan. First, the interannual variability of significant wave heights (H s ) for the summer mean (June-August, SH s ) is analyzed. A large difference between wave spectrum (E(f, t)) in high SH s years and that in low SH s years is found at the frequency of 0.09 Hz. It is revealed that the difference is related to the changes in enhanced tropical cyclone (with central air pressure below 980 hPa) activity in the western North Pacific. Second, the interannual variability of H s for the winter mean (December-February, WH s ) is investigated. It is found that there is a large difference between E(f, t) in high WH s years and that in low WH s years at the frequency of 0.11 Hz. It is revealed that the difference is related to the changes in southerly wind intensity (integral of southerly wind speed by hours) associated with extratropical cyclones. Third, the interdecadal variability of WH s is described. The time series of anomalies of WH s , smoothed by means of a 7-year moving average, is divided into three periods : 1980-1985, 1986-1996, and 1997-2003. The first empirical orthogonal function of 10-m meridional sea surface winds captures the interdecadal variability over the storm track. The smoothed WH s exhibits similar variation to that of the leading principal component of the winds.

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“…In addition, understanding coastal wave climate is effective for diagnosis of changes in the coastal ecosystem and coastal sediment transport. There have been many studies on the changes in the wintertime wave climate in the North Atlantic [ Wang and Swail , 2001, 2002; WASA Group , 1998] and the North Pacific [ Hatada et al , 2001, 2002; Graham and Diaz , 2001; Wang and Swail , 2001; Allan and Komar , 2000]. On the other hand, we investigated the changes in summertime (June–August) wave climate at a site off the coast of southern Japan and in the western North Pacific (WNP), with emphasis on the relation to tropical cyclone (TC) activity.…”

Section: Introductionmentioning

confidence: 99%

Quasi‐decadal variability of fall extreme wave heights in the western North Pacific

Sasaki

Iwasaki

Matsuura

et al. 2006

Geophysical Research Letters

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We present a prominent quasi–decadal variability of fall extreme wave heights (H90, September–November mean of the monthly 90th percentile of significant wave heights) in the western North Pacific (WNP), based on wave reanalysis of the ERA40. It is found by applying an Empirical Orthogonal Function (EOF) analysis to H90 for 1957–2001 that the first EOF mode captures a monopole structure with maximum amplitude in the south of Japan with quasi–decadal variability of approximately 15–year. The quasi–decadal variability is also found partially in H90 observed around southern coast of Japan. By comparing intense tropical cyclone (ITC, with central pressure below 980 hPa) tracks for the decennial periods, we may be able to attribute the quasi–decadal variability of H90 in the WNP to the changes in the ITC tracks around the south of Japan.

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Estimation of Long-Term Variability of Wave Climate Around the Coastal Sea Areas of Japan

Cited by 4 publications

References 0 publications

Recent increase in summertime extreme wave heights in the western North Pacific

Recent increase in summertime extreme wave heights in the western North Pacific

Changes in wave climate off Hiratsuka, Japan, as affected by storm activity over the western North Pacific

Quasi‐decadal variability of fall extreme wave heights in the western North Pacific

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