Search Results 1-20 of 120

  • Modulation of the Diurnal Cycle of Precipitation near the Southwestern Coast of Sumatra by Mixed Rossby-Gravity Waves

    GENG Biao , KATSUMATA Masaki , TANIGUCHI Kyoko

    … Wind oscillations were attributed to several westward-propagating MRGWs traversing the study site. … However, diurnal precipitation displayed a similar well-defined phase and propagation pattern over the land and ocean, coherent with the regular evolution of sea- and land-breeze circulations, regardless of wind perturbations induced by MRGWs. …

    Journal of the Meteorological Society of Japan. Ser. II, 2020

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  • Resolution Dependencies of Tropical Convection in a Global Cloud/Cloud-System Resolving Model

    MIYAKAWA Tomoki , MIURA Hiroaki

    … The reproduced MJOs, which accounted for a large portion of the tropical convections, were similar in the 3.5-km and 14-km simulations in terms of eastward propagation speeds and structures, including the characteristic westward tilt of the moisture anomaly with height. …

    Journal of the Meteorological Society of Japan. Ser. II 97(3), 745-756, 2019

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  • Substorm-Associated Ionospheric Flow Fluctuations During the 27 March 2017 Magnetic Storm: SuperDARN-Arase Conjunction

    Hori T. , Nishitani N. , Shepherd S. G. , Ruohoniemi J. M. , Connors M. , Teramoto M. , Nakano S. , Seki K. , Takahashi N. , Kasahara S. , Yokota S. , Mitani T. , Takashima T. , Higashio N. , Matsuoka A. , Asamura K. , Kazama Y. , Wang S.-Y. , Tam S. W. Y. , Chang T.-F. , Wang B.-J. , Miyoshi Y. , Shinohara I.

    … A set of the radars have provided the first ever observations that the fluctuations propagate azimuthally both westward and eastward simultaneously, showing bifurcated phase propagation associated with substorm expansion. …

    Geophysical Research Letters 45(18), 9441-9449, 2018-09-28

    IR 

  • EDDY ANALYSIS IN THE NORTH PACIFIC USING AN EDDY-TRACKING ALGORITHM  [in Japanese]

    UCHIYAMA Yusuke , OKADA Nobue , KUROSAWA Kenta

    … Mesoscale eddies generally propagate westward as non-dispersive, first-mode baroclinic Rossby waves in the SZB and U.S. West Coast, according to a frequenc-ywavenumber spectral analysis. … In contrast, the eddies in the KE are rather multi-directional with notable eastward propagation due to eastward eddy shedding from the eastward-drifting Kuroshio. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 73(2), I_1429-I_1434, 2017

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  • Theoretical and analytical study for western boundary currents and their extensions  [in Japanese]

    佐々木 克徳 , Yoshi N. Sasaki , 北海道大学大学院理学研究院 , Graduate School of Science Hokkaido University

    … It has been known that decadal variability of the KE exhibits a lagged response to atmospheric fluctuations by several years, suggesting an importance of Rossby wave propagation. … To overcome this problem, I proposed a new mechanism in which Rossby waves propagate westward along the jet, referred to as jet-trapped Rossby waves. … The jet-trapped Rossby waves can account for the speed and spatial structures of westward propagating signals on decadal timescales. …

    海の研究 25(1), 1-16, 2016-01

  • Structure of Tropical Convective Systems in Aqua-Planet Experiments: Radiative-Convective Equilibrium Versus the Earth-Like Experiment

    Satoh Masaki , Aramaki Kento , Sawada Masahiro

    … CTL-exp shows a well-known multi-scale convective structure where a smaller convective system propagates westward along the equator whereas a larger convective system propagates eastward. … We speculate that the difference in CTL-exp and RCE-exp structures comes from the propagation speed of the convective systems.</p> …

    SOLA 12(0), 220-224, 2016

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  • A New Gravity Wave Parameterization Including Three-Dimensional Propagation

    AMEMIYA Arata , SATO Kaoru

    …  Recent studies suggest that the horizontal propagation of gravity waves (GWs) is important in the spatial distribution of gravity wave forcing (GWF), especially during winter in the high latitudes of the Southern Hemisphere (SH). … However, most standard gravity wave parameterizations (GWPs) treat GW propagation simply in the vertical. … In this study, a new orographic GWP that includes three-dimensional (3D) GW propagation is developed and its impact on large-scale dynamical fields is examined. …

    Journal of the Meteorological Society of Japan. Ser. II 94(3), 237-256, 2016

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  • Seasonal Onset of the Madden-Julian Oscillation and its Relation to the Southeastern Indian Ocean Cooling

    SEIKI Ayako , NAGURA Motoki , HASEGAWA Takuya , YONEYAMA Kunio

    … A westward propagation of the annual downwelling Rossby waves occurs in the south Indian Ocean for most of the years. … Zonal advection, in turn, is connected with the strength of westward currents associated with the Rossby waves. …

    Journal of the Meteorological Society of Japan. Ser. II 93A(0), 139-156, 2015

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  • Interaction between Rossby and Gravity Waves in a Simple Analytical Model

    ODA Mayuko , KANEHISA Hirotada

    … Because of the gradients, there exist westward-propagating upper Rossby and westward- and eastward-propagating lower gravity waves, where the propagation is relative to the fluid. …

    Journal of the Meteorological Society of Japan. Ser. II 93(4), 425-442, 2015

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  • The contribution of standing Rossby waves to the development of the Tsushima Warm Current-meandering  [in Japanese]

    Morie Ryosuke , Isoda Yutaka , Fujiwara Shohei , Fang Xiaorong , Ryosuke Morie , Yutaka Isoda , Shohei Fujiwara , Xiaorong Fang , 北海道大学大学院環境科学院 , 北海道大学大学院水産科学研究院 , 北海道大学大学院水産科学研究院 , 北海道大学大学院水産科学研究院 , Graduate School of Enviromental Science Hokkaido University , Graduate School of Fisheries Science Hokkaido University , Graduate School of Fisheries Science Hokkaido University , Graduate School of Fisheries Science Hokkaido University

    … The model is rep resented by the standing Rossby waves under the state of the balance between a westward propagation speed of Rossby waves and an eastward flow speed. …

    Oceanography in Japan 24(1), 29-47, 2015

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  • Numerical modeling of tidal dynamics in the Java Sea

    YUSUF Mustaid , YANAGI Tetsuo

    … In the present study we focus on the tidal wave propagation, tidal energy propagation, tide-induced residual current and the tidal front critical value in the Java Sea. … Based on our model results, we have found that tidal wave and tidal energy fluxes propagate westward in the Java Sea and also clearly shown the bifurcation of M2 tidal wave in the Makassar Strait. …

    Coastal marine science 36・37(1), 1-12, 2014

    IR  DOI 

  • Velocity Measurement of Internal Waves in the South China Sea by Multi-Temporal and Multi-Sensor Satellite Images (Space, Aeronautical and Navigational Electronics)

    HONG Dan-Bee , YANG Chan-Su , OUCHI Kazuo

    … In this study, MODIS/Terra and ENVISAT/ASAR were used to obtain sequential images of internal waves in the South China Sea for estimating the propagation properties of internal waves. … Most of internal waves in the South China Sea were propagating westward due to strong currents of the Kuroshio. …

    Technical report of IEICE. SANE 113(335), 81-86, 2013-12-02

  • The Aqua-Planet Experiment (APE): CONTROL SST Simulation

    BLACKBURN Michael , BORTH Hartmut , WIRTH Volkmar , FRANK Helmut , BECHTOLD Peter , WEDI Nils P. , TOMITA Hirofumi , SATOH Masaki , ZHAO Ming , HELD Isaac M. , SUAREZ Max J. , WILLIAMSON David L. , LEE Myong-In , WATANABE Masahiro , KIMOTO Masahide , LIU Yimin , WANG Zaizhi , MOLOD Andrea , RAJENDRAN Kavirajan , KITOH Akio , STRATTON Rachel , NAKAJIMA Kensuke , OHFUCHI Wataru , TAKAHASHI Yoshiyuki O. , HAYASHI Yoshi-Yuki , NAKAMURA Hisashi , ISHIWATARI Masaki , McGREGOR John L.

    … The equatorial wave spectrum shows a wide range of precipitation intensity and propagation characteristics. … Kelvin mode-like eastward propagation with remarkably constant phase speed dominates in most models. … Westward propagation, less dispersive than the equatorial Rossby modes, dominates in a few models or occurs within an eastward propagating envelope in others. …

    Journal of the Meteorological Society of Japan. Ser. II 91A(0), 17-56, 2013

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  • ENSO Regime Change since the Late 1970s as Manifested by Two Types of ENSO

    REN Hong-Li , JIN Fei-Fei , F. STUECKER Malte , XIE Ruihuang

    …  During the late 1970s, the El Niño-Southern Oscillation (ENSO) experienced a notable regime change, manifested by a change in amplitude, dominant ENSO period, and sea surface temperature anomaly (SSTA) propagation characteristics. …

    Journal of the Meteorological Society of Japan. Ser. II 91(6), 835-842, 2013

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  • The Impact of Intraseasonal Oscillations in the Tropical Atmosphere on the Formation of Extreme Central Vietnam Precipitation

    Wu Peiming , Fukutomi Yoshiki , Matsumoto Jun

    … Results from an analysis of data from the Japan Meteorological Agency Climate Data Assimilation System (JCDAS) showed that the combined effects of a westward-propagating synoptic-scale tropical disturbance from the western Pacific and the eastward propagation of a strong active phase of the Madden Julian Oscillation (MJO) from the Indian Ocean were the primary causes. …

    SOLA 8(0), 57-60, 2012

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  • Effect of the Anisotropic Ionosphere on the Sferic Propagation and Improved Single-Site Lightning Location Technique  [in Japanese]

    OZAKI Mitsunori , YAGITANI Satoshi , MIYAZAKI Kazuhisa , NAGANO Isamu

    … Difference in the eastward and westward propagation characteristics in the Earth-ionosphere waveguide is one of the well-known effects of the anisotropic ionosphere. … In this study, in order to clarify the effect of the anisotropic ionosphere on VLF sferic propagation, the single-site lightning location technique is theoretically analyzed. …

    IEICE technical report 111(131), 55-58, 2011-07-07

    References (7)

  • The Comparison of Source Models of Repeating Subduction-zone Earthquakes Estimated Using Broadband Strong Motion Records : 1982 and 2008 Ibaraki-ken-oki M7 Earthquakes  [in Japanese]

    TAKIGUCHI Masaharu , ASANO Kimiyuki , IWATA Tomotaka

    … We compared the observed waveforms of the 1982MS and the 2008MS at the same stations and identi.ed the initial rupture phase for the 1982MS. We assumed a single rectangular SMGA away from the hypocenter of the 1982MS. The SMGA was located about 33 km westward from the hypocenter and ruptured about 11s after the origin time; …

    Zisin (Journal of the Seismological Society of Japan. 2nd ser.) 63(4), 223-242, 2011-03-25

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  • Analytical Solutions of Initial Value Problem of Diabatic Rossby Waves

    ODA Mayuko , KANEHISA Hirotada

    … The PV disturbance propagates eastward (westward) on the lower (upper) level relative to the fluid, while the prescribed basic zonal flow advects the PV disturbance toward the opposite direction. … On the other hand, for a zonal wavelength longer than a marginal one, the propagation effect is dominant, and consequently, the lower and upper PV disturbances tend to move upstream and away from each other. …

    Journal of the Meteorological Society of Japan. Ser. II 89(2), 161-169, 2011

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  • A Study on the Satellite Diversity and Time Delayed Diversity Techniques in Ku-band Satellite Communications Links

    MAEKAWA Yasuyuki , HATSUDA Takeshi

    … The effects of satellite and time delayed diversity techniques on Ku-band rain attenuation were investigated in three propagation paths with azimuth angle separations of 30 to 60deg, using the radio waves continuously received from several kinds of Ku-band satellites at Osaka Electro-Communication University (OECU) during 2003-2008. … This improvement is shown to be more effective when the time delay is applied to the satellite with its orbital position westward to the other one. …

    IEICE technical report 109(254), 169-174, 2009-10-22

    References (4)

  • A Study on the Satellite Diversity and Time Delayed Diversity Techniques in Ku and Ka Band Satellite Communications Links  [in Japanese]

    MAEKAWA Yasuyuki , HATSUDA Takeshi

    … The effects of satellite and time delayed diversity techniques on Ku- and Ka-band rain attenuation were investigated in six propagation paths with azimuth angle separations of 30 to 60deg, using the radio waves continuously received from several kinds of Ku and Ka band satellites at Osaka Electro-Communication University (OECU) during 1995-1998 and 2003-2008. … The improvement is shown to be more effective when the time delay is applied to the satellite with its orbital position westward to the other one. …

    IEICE technical report 109(117), 147-152, 2009-07-01

    References (7)

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