The probability distribution function (PDF) of the upper (0-50 m) tropical Pacific current speeds (w), constructed from hourly ADCP data (1990-2007) at six stations for the Tropical Atmosphere Ocean project, satisfies the two-parameter Weibull distribution reasonably well with different characteristics between El Nino and La Nina events: In the western Pacific, the PDF of w has a larger peakedness during the La Nina events than during the El Nino events; and vice versa in the eastern Pacific. However, the PDF of w for the lower layer (100-200 m) does not fit the Weibull distribution so well as the upper layer. This is due to the different stochastic differential equations between upper and lower layers in the tropical Pacific. For the upper layer, the stochastic differential equations, established on the base of the Ekman dynamics, have analytical solution, i. e., the Rayleigh distribution (simplest form of the Weibull distribution), for constant eddy viscosity K. Knowledge on PDF of w during the El Nino and La Nina events will improve the ensemble horizontal flux calculation, which contributes to the climate studies.
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Univ Tokyo, Grad Sch Frontier Sci, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, JapanUniv Tokyo, Grad Sch Frontier Sci, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, Japan
Onda, Hiroaki
Miller, Michael J.
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Nihon Univ, Coll Bioresource Sci, Dept Marine Sci & Resources, 1866 Kameino, Fujisawa, Kanagawa 2520880, JapanUniv Tokyo, Grad Sch Frontier Sci, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, Japan
Miller, Michael J.
Takeshige, Aigo
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Univ Tokyo, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, JapanUniv Tokyo, Grad Sch Frontier Sci, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, Japan
Takeshige, Aigo
Miyake, Yoichi
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Univ Tokyo, Grad Sch Frontier Sci, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, JapanUniv Tokyo, Grad Sch Frontier Sci, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, Japan
Miyake, Yoichi
Kuroki, Mari
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Univ Tokyo, Grad Sch Agr & Life Sci, Dept Aquat Biosci, Bunkyo Ku, 1-1-1 Yayoi, Tokyo 1138657, JapanUniv Tokyo, Grad Sch Frontier Sci, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, Japan
Kuroki, Mari
Aoyama, Jun
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Univ Tokyo, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, JapanUniv Tokyo, Grad Sch Frontier Sci, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, Japan
Aoyama, Jun
Kimura, Shingo
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Univ Tokyo, Grad Sch Frontier Sci, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, JapanUniv Tokyo, Grad Sch Frontier Sci, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, Japan
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Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R China
Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R ChinaChinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R China
Lin Pengfei
Liu Hailong
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Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R ChinaChinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R China
Liu Hailong
Zhang Xuehong
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Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R ChinaChinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R China