Faculty Profiles - AIKI Hidenori

Papers - AIKI Hidenori

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A global eddying hindcast ocean simulation with OFES2 Reviewed

Hideharu Sasaki, Shinichiro Kida, Ryo Furue, Hidenori Aiki, Nobumasa Komori, Yukio Masumoto, Toru Miyama, Masami Nonaka, Yoshikazu Sasai, Bunmei Taguchi

GEOSCIENTIFIC MODEL DEVELOPMENT Vol. 13 ( 7 ) page： 3319 - 3336 2020.7

Language：English Publishing type：Research paper (scientific journal) Publisher：COPERNICUS GESELLSCHAFT MBH

A quasi-global eddying ocean hindcast simulation using a new version of our model, called OFES2 (Ocean General Circulation Model for the Earth Simulator version 2), was conducted to overcome several issues with unrealistic properties in its previous version, OFES. This paper describes the model and the simulated oceanic fields in OFES2 compared with OFES and also observed data. OFES2 includes a sea-ice model and a tidal mixing scheme, is forced by a newly created surface atmospheric dataset called JRA55-do, and simulated the oceanic fields from 1958 to 2016. We found several improvements in OFES2 over OFES: smaller biases in the global sea surface temperature and sea surface salinity as well as the water mass properties in the Indonesian and Arabian seas. The time series of the Nino3.4 and Indian Ocean Dipole (IOD) indexes are somewhat better in OFES2 than in OFES. Unlike the previous version, OFES2 reproduces more realistic anomalously low sea surface temperatures during a positive IOD event. One possible cause of these improvements in El Nino and IOD events is the replacement of the atmospheric dataset. On the other hand, several issues remained unrealistic, such as the pathways of the Kuroshio and Gulf Stream and the unrealistic spreading of salty Mediterranean overflow. Given the worldwide use of the previous version and the improvements presented here, the output from OFES2 will be useful in studying various oceanic phenomena with broad spatiotemporal scales.

DOI： 10.5194/gmd-13-3319-2020

Web of Science

The Climatological Horizontal Pattern of Energy Flux in the Tropical Atlantic as Identified by a Unified Diagnosis for Rossby and Kelvin Waves Reviewed

Qingyang Song, Hidenori Aiki

JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Vol. 125 ( 2 ) 2020.2

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER GEOPHYSICAL UNION

This study investigates the horizontal distribution of wave energy flux in the tropical Atlantic Ocean using shallow-water model experiments for three gravest baroclinic modes forced by climatological winds. This is the first attempt to apply a unified diagnostic scheme to the analysis of energy fluxes associated with both Rossby waves (RWs) and Kelvin waves (KWs) in the tropical Atlantic Ocean. Those analyses were difficult in previous studies owing to the difference of equatorial and quasigeostrophic dynamics. The scheme yields the transfer route (i.e., trajectories by group velocity vector) of wave energy originating from both local wind forcing and boundary reflection. The meridional flux of wave energy crossing two zonal sections (at 3 degrees N and at 2 degrees S) is examined for understanding where the equatorial and off-equatorial regions interconnect. Equatorward energy fluxes into the basin interior are found mainly on the zonal section in the Northern Hemisphere (at 3 degrees N), indicating the radiation of RWs from the Guinea coast. At the equator, seasonal transition in May from eastward wind anomaly to westward anomaly yields a significant energy input at the central basin that radiates both RWs and KWs. The energy flux of these RWs arrives at the western boundary in September, followed by reflection of KWs to yield eastward transbasin energy fluxes in October-December. The analysis also identifies an unexpected wind input in May at 4 degrees S which induces both RWs and inertial gravity waves.Plain Language Summary Propagation, diffraction, and reflection of large-scale waves play an important role in tropical climate variations. Horizontal energy fluxes associated with Rossby and Kelvin wave interaction have been little investigated owing to the lack of an appropriate diagnostic scheme in previous studies. A recent study has developed a diagnostic scheme which can reveal the trajectory of the group velocity of both Rossby and Kelvin waves with satisfying coastal boundary conditions. This scheme has been used in the present study to investigate energetics in the output of climatological model experiments. At the equator, seasonal transition in May from eastward wind anomaly to westward anomaly yields a significant energy input at the central basin that radiates both Rossby and Kelvin waves. The energy flux of these Rossby waves arrives at the western boundary in September, followed by reflection of Kelvin waves to yield eastward transbasin energy fluxes in October-December. The unified scheme may be used to understand the impact of tropical climate variations to off-equatorial regions and vice versa in a future study.

DOI： 10.1029/2019JC015407

Web of Science

The Life Cycle of Annual Waves in the Indian Ocean as Identified by Seamless Diagnosis of the Energy Flux Reviewed

Zimeng Li, Hidenori Aiki

GEOPHYSICAL RESEARCH LETTERS Vol. 47 ( 2 ) 2020.1

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER GEOPHYSICAL UNION

In previous studies, the role of large-scale waves in tropical-extratropical interactions has been little investigated in terms of wave energy transfer owing to the lack of appropriate diagnostic techniques. Using a new seamless scheme, the present study identifies a series of well-defined horizontal circulation routes of wave energy in the Indian Ocean on an annual basis. One of these features represents a localized cyclonic circulation close to the western boundary in each hemisphere while the other manifests as a basin-scale cyclonic circulation in the eastern Indian Ocean. For the second baroclinic mode, eastward energy fluxes associated with equatorial Kelvin waves appear when zonal velocity anomaly exhibits eastward and westward peaks (four times per year) in response to the monsoon-wind cycle. Identification of these key pathways of wave energy circulation enables us to better understand how waves in the tropical and subtropical regions interconnect at the zonal boundaries of the Indian Ocean.

DOI： 10.1029/2019GL085670

Web of Science

The Pathway of Intraseasonal Wave Energy in the Tropical Indian Ocean as Identified by a Seamless Diagnostic Scheme Reviewed

Tomomichi Ogata, Hidenori Aiki

SOLA Vol. 15 page： 262 - 267 2019.12

Language：English Publishing type：Research paper (scientific journal) Publisher：METEOROLOGICAL SOC JAPAN

This study makes a first attempt to apply the diagnostic scheme of Aiki et al. (2017) to the output of an ocean general circulation model (OGCM), in order to investigate the basin-wide pathway of equatorial and mid-latitude wave energy associated with intraseasonal variability in the Indian Ocean. The vertical mode decomposition shows that 90-day variability of the second baroclinic mode is dominant in a realistic OGCM experiment. For 90-day equatorial Kelvin wave (KW) and Rossby wave (RW), energy input by wind stress appears in the eastern equatorial Indian Ocean that is then transferred eastward by KWs along the eastern equatorial waveguide (while westward as RW off equator). For 30-day Mixed-Rossby Gravity waves (MRG), wave energy is transferred eastward while wave phase propagates westward that is consistent with the dispersion relationship of low-frequency MRG. The new diagnostic scheme is able to show, particularly for 30-day MRG, eastward energy fluxes along the equatorial waveguide, while the other schemes in previous studies (e.g. pressure flux, quasi-geostrophic flux) cannot show the direction of the group velocity of equatorial waves.

DOI： 10.2151/sola.2019-047

Web of Science

Future Changes in Typhoon-Related Precipitation in Eastern Hokkaido Reviewed

Sachie Kanada, Hidenori Aiki, Kazuhisa Tsuboki, Izuru Takayabu

SOLA Vol. 15 page： 244 - 249 2019.11

Language：English Publishing type：Research paper (scientific journal) Publisher：METEOROLOGICAL SOC JAPAN

From 16 to 23 August 2016, typhoons T1607, T1609, and T1611 hit eastern Hokkaido in northern Japan and caused heavy rainfall that resulted in severe disasters. To understand future changes in typhoon-related precipitation (TRP) in midlatitude regions, climate change experiments on these three typhoons were conducted using a high-resolution three-dimensional atmosphere-ocean coupled regional model in current and pseudo-global warming (PGW) climates. All PGW simulations projected decreases in precipitation frequency with an increased frequency of strong TRP and decreased frequency of weak TRP in eastern Hokkaido. In the current climate, snow-dominant precipitation systems start to cause precipitation in eastern Hokkaido about 24 hours before landfall. In the PGW climate, increases in convective available potential energy (CAPE) developed tall and intense updrafts and the snow-dominant precipitation systems turned to have more convective property with less snow mixing ratio (QS). Decreased QS reduced precipitation area, although strong precipitation increased or remained almost the same. Only TRP of T1607 increased the amounts before landfall. In contrast, all typhoons projected to increase TRP amount associated with landfall, because in addition to increased CAPE, the PGW typhoon and thereby its circulations intensified, and a large amount of rain was produced in the core region.

DOI： 10.2151/sola.2019-044

Web of Science

Salinity frontogenesis/frontolysis in the northeastern subtropical Pacific region Reviewed

Shun Ohishi, Shota Katsura, Hidenori Aiki

CLIMATE DYNAMICS Vol. 53 ( 9-10 ) page： 5927 - 5943 2019.11

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER

Detailed mechanisms of reinforcement/relaxation of a sea surface salinity front, i.e. frontogenesis/frontolysis, in the northeastern subtropical Pacific region are investigated using observational datasets. Throughout the year, meridional shears of zonal wind induce meridional ageostrophic convergence around the front. Saltier water is advected on the southern side than the northern side, and thus the convergence contributes to frontogenesis. The evaporation and precipitation gradients also strengthen the front, because higher sea surface temperatures on the southern side induce stronger evaporation through the formation of higher surface saturated specific humidity, and because the precipitation rate is low in the southern region in association with the subtropical high of the atmosphere. However, in summer-autumn when the mixed layer is seasonally thin and evaporation exceeds precipitation, the frontogenesis by the freshwater flux gradient is damped by the mixed layer depth (MLD) gradient. This is attributed to the thicker mixed layer south of the front being less sensitive to freshwater fluxes. During the mixed-layer deepening phase, the mixed layer on the southern side entrains lower salinity water from the lower layer, and thus the entrainment relaxes the front. Therefore, it is shown that the gradients of ageostrophic advection, evaporation, and precipitation result in frontogenesis, while those of MLD and entrainment cause frontolysis. Furthermore, a metric that quantifies the relative importance of the horizontal gradients of freshwater fluxes and MLD for salinity frontogenesis/frontolysis is proposed. Over the large domain, contribution from the horizontal gradient of freshwater fluxes dominates over that of MLD.

DOI： 10.1007/s00382-019-04907-w

Web of Science

Flood Simulations in Mid-Latitude Agricultural Land Using Regional Current and Future Extreme Weathers Reviewed

Nobuaki Kimura, Hirohide Kiri, Sachie Kanada, Iwao Kitagawa, Ikuo Yoshinaga, Hidenori Aiki

WATER Vol. 11 ( 11 ) 2019.11

Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI

Recent extreme weather events like the August 2016 flood disaster have significantly affected farmland in mid-latitude regions like the Tokachi River (TR) watershed, the most productive farmland in Japan. The August 2016 flood disaster was caused by multiple typhoons that occurred in the span of two weeks and dealt catastrophic damage to agricultural land. This disaster was the focus of our flood model simulations. For the hydrological model input, the rainfall data with 0.04 degrees grid space and an hourly interval were provided by a regional climate model (RCM) during the period of multiple typhoon occurrences. The high-resolution data can take account of the geographic effects, hardly reproduced by ordinary RCMs. The rainfall data drove a conceptual, distributed rainfall-runoff model, embedded in the integrated flood analysis system. The rainfall-runoff model provided discharges along rivers over the TR watershed. The RCM also provided future rainfall data with pseudo-global warming climate, assuming that the August 2016 disaster could reoccur again in the late 21st century. The future rainfall data were used to conduct a future flood simulation. With bias corrections, current and future flood simulations showed the potential inundated areas along riverbanks based on flood risk levels. The crop field-based agricultural losses in both simulations were estimated. The future cost may be two to three times higher as indicated by slightly higher simulated future discharge peaks in tributaries.

DOI： 10.3390/w11112421

Web of Science

Frontolysis by surface heat flux in the eastern Japan Sea: importance of mixed layer depth Reviewed

Shun Ohishi, Hidenori Aiki, Tomoki Tozuka, Meghan F. Cronin

JOURNAL OF OCEANOGRAPHY Vol. 75 ( 3 ) page： 283 - 297 2019.6

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER

Frontolysis mechanisms by which surface heat flux relaxes the sea surface temperature (SST) front in the eastern Japan Sea (JS) are investigated in detail using observational datasets. On the warm southern side of the front, larger air-sea specific humidity and temperature differences induce stronger turbulent heat release compared to the cool northern side. As a result, stronger wintertime cooling and weaker summertime warming occur south of the front, and the meridional gradient in the surface net heat flux (NHF) tends to relax the SST front throughout the year. In the mixed-layer deepening phase (September-January), a higher entrainment velocity occurs on the warm southern side because of weaker stratification. Since the resulting thicker mixed layer on the southern side is less sensitive to surface cooling, the mixed layer depth (MLD) gradient damps the frontolysis by the NHF gradient. In the shoaling phase (April-June), a deeper mixed layer south of the front is caused by the weaker warming and reduced sensitivity of the thicker mixed layer to a shoaling effect by shortwave radiation. Owing to weaker sensitivity of the thicker mixed layer on the southern side to surface warming, the MLD gradient enhances the frontolysis by the NHF gradient. Therefore, it is shown that the mixed layer processes cause seasonality of weaker (stronger) frontolysisby surface heat fluxes, damping (enhancing) the frontolysis by the NHF gradient in winter (summer). This study reveals unique features of the frontolysis in the eastern JS compared with the Agulhas Return Current and Kuroshio Extension regions.

DOI： 10.1007/s10872-018-0502-0

Web of Science

One-Dimensional Turbulence-Ecosystem Model Reveals the Triggers of the Spring Bloom in Mesoscale Eddies

E. R. Maúre, J. Ishizaka, H. Aiki, Y. Mino, N. Yoshie, J. I. Goes, J. I. Goes, H. R. Gomes, H. R. Gomes, H. Tomita

Journal of Geophysical Research: Oceans Vol. 123 ( 9 ) page： 6841 - 6860 2018.9

Language：English Publishing type：Research paper (scientific journal)

©2018. American Geophysical Union. All Rights Reserved. A lower trophic ecosystem model coupled with a one-dimensional physical turbulence closure model was applied to study phytoplankton dynamics and spring bloom initiation in mesoscale anticyclonic eddies (AEs) and cyclonic eddies (CEs). The model simulated ecosystem dynamics between nutrient-phytoplankton-zooplankton-detritus in AEs and CEs, while the physical model provided the seasonal cycle of convective turbulent mixing. The study was motivated by earlier work based on satellite and ship observations, which showed earlier initiation of the spring blooms in CEs with shallow mixed-layer depths than in AEs with deeper mixed-layer depths. The model results supported the hypothesis that mixed-layer depths in eddies play an important role in the dynamics of the spring bloom initiation. Model results revealed that in AEs convective mixing causes light limitation for phytoplankton growth due to deep winter mixing, and the bloom initiation is delayed until relaxation of turbulent convective mixing. Conversely, in the shallow mixed-layer CEs, blooms initiate before the end of convective mixing due to early improvement in light conditions following the increase in solar radiation. Furthermore, the model showed that the relaxation in zooplankton grazing for the deep mixing contributed to weak winter phytoplankton accumulation in AE, while winter phytoplankton accumulation was faster in the shallow mixed-layer CE. Overall, the initiation mechanism and the dynamics of the spring phytoplankton blooms are different for AEs and CEs. Therefore, we suggest that, in many parts of the global ocean, eddies play an important role regulating the dynamics of phytoplankton blooms.

DOI： 10.1029/2018JC014089

Web of Science

Scopus

Impact of cyclonic eddies and typhoons on biogeochemistry in the oligotrophic ocean based on biogeochemical/physical/meteorological time-series at station KEO Reviewed

Makio C. Honda, Yoshikazu Sasai, Eko Siswanto, Akira Kuwano-Yoshida, Hidenori Aiki, Meghan F. Cronin

PROGRESS IN EARTH AND PLANETARY SCIENCE Vol. 5 2018.8

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGEROPEN

In 2014, a sediment trap mooring was deployed adjacent to station Kuroshio Extension Observatory (KEO)'s National Ocean and Atmosphere Administration (NOAA) surface mooring. These data, from July 2014 to July 2016, are used here to investigate nutrient supply mechanisms that support ocean productivity in this oligotrophic region of the subtropical western North Pacific. Both years of sediment trap data show that biogenic material fluxes at similar to 5000 m increased between late winter (March) and late spring (June). Based on sea surface temperature and upper ocean water temperature profiles, from the NOAA surface buoy, and satellite-based surface chlorophyll-alpha, this increase was likely due to an increase of ocean productivity in early spring (March) that was supported by nutrients supplied by winter mixing. On the other hand, biogenic material fluxes also increased in October 2014, and between late December 2014 and January 2015 when concentrations of nutrients near the surface typically are low. Sea surface height anomalies and vertical profiles of water temperature in the upper 500 m showed cyclonic eddies passing station KEO and causing upwelling in late July-early August 2014 and November 2014. It appears that these events supplied nutrients to the upper layer, which then caused ocean productivity in the subsurface layer to temporally increase, resulting in increased deep biogenic material fluxes in autumn and winter. This interpretation of the data is consistent with a simple 3D physical- biological model simulation that shows meso-scale cyclonic eddies can supply nutrient to support new production at KEO. During the 2-year-long sediment trap deployments, several typhoons also passed near station KEO and near-inertial internal waves were observed near the nitracline depth after the typhoons passed. Although turbulent mixing caused by near-inertial internal wave could have possibly supplied nutrient to upper oligotrophic euphotic layer, numerical simulations of the turbulent nutrient supply indicate that enhanced turbulent diffusion across the nutrient concentration gradient did not supply enough nitrate to support the increase in biogenic material flux in autumn.

DOI： 10.1186/s40645-018-0196-3

Web of Science

Impacts of SST Patterns on Rapid Intensification of Typhoon Megi (2010) Reviewed

Sachie Kanada, Satoki Tsujino, Hidenori Aiki, Mayumi K. Yoshioka, Yasumasa Miyazawa, Kazuhisa Tsuboki, Izuru Takayabu

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 122 ( 24 ) page： 13245 - 13262 2017.12

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER GEOPHYSICAL UNION

Typhoon Megi (2010), a very intense tropical cyclone with a minimum central pressure of 885 hPa, was characterized by especially rapid intensification. We investigated this intensification process by a simulation experiment using a high-resolution (0.02 degrees x0.02 degrees) three-dimensional atmosphere-ocean coupled regional model. We also performed a sensitivity experiment with a time-fixed sea surface temperature (SST). The coupled model successfully simulated the minimum central pressure of Typhoon Megi, whereas the fixed SST experiment simulated an excessively low minimum central pressure of 839 hPa. The simulation results also showed a close relationship between the radial SST profiles and the rapid intensification process. Because the warm sea increased near-surface water vapor and hence the convective available potential energy, the high SST in the eye region facilitated tall and intense updrafts inside the radius of maximum wind speed and led to the start of rapid intensification. In contrast, high SST outside this radius induced local secondary updrafts that inhibited rapid intensification even if the mean SST in the core region exceeded 29.0 degrees C. These secondary updrafts moved inward and eventually merged with the primary eyewall updrafts. Then the storm intensified rapidly when the high SST appeared in the eye region. Thus, the changes in the local SST pattern around the storm center strongly affected the rapid intensification process by modulating the radial structure of core convection. Our results also show that the use of a high-resolution three-dimensional atmosphere-ocean coupled model offers promise for improving intensity forecasts of tropical cyclones.

DOI： 10.1002/2017JD027252

Web of Science

Scopus

Mesoscale Eddies Control the Timing of Spring Phytoplankton Blooms: A Case Study in the Japan Sea Reviewed

E. R. Maure, J. Ishizaka, C. Sukigara, Y. Mino, H. Aiki, T. Matsuno, H. Tomita, J. I. Goes, H. R. Gomes

GEOPHYSICAL RESEARCH LETTERS Vol. 44 ( 21 ) page： 11115 - 11124 2017.11

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER GEOPHYSICAL UNION

Satellite Chlorophyll a (CHL) data were used to investigate the influence of mesoscale anticyclonic eddies (AEs) and cyclonic eddies (CEs) on the timing of spring phytoplankton bloom initiation around the Yamato Basin (133-139 degrees E and 35-39.5 degrees N) in the Japan Sea, for the period 2002-2011. The results showed significant differences between AEs and CEs in the timing and initiation mechanism of the spring phytoplankton bloom. Blooms were initiated earlier in CEs which were characterized by shallow mixed-layer depths (< 100 m). The early blooming preceded the end of winter cooling (i.e., while net heat flux (Q(0)) is still negative) and is initiated by the increased average light within the shallow mixed-layer depth. Conversely, blooms appeared in the AEs despite deeper mixed-layer depth (> 100 m) but close to the commencement of positive Q(0). This suggests that the relaxation of turbulent mixing is crucial for the bloom initiation in AEs.

DOI： 10.1002/2017GL074359

Web of Science

Scopus

Comments on "A Combined Derivation of the Integrated and Vertically Resolved, Coupled Wave-Current Equations" Reviewed

Fabrice Ardhuin, Nobuhiro Suzuki, James C. McWilliams, Hidenori Aiki

JOURNAL OF PHYSICAL OCEANOGRAPHY Vol. 47 ( 9 ) page： 2377 - 2385 2017.9

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER METEOROLOGICAL SOC

Several equivalent equations for the evolution of the wave-averaged current momentum have been proposed, implemented, and used. In contrast, the equation for the total momentum, which is the sum of the current and wave momenta, has not been widely used because it requires a less practical wave forcing. In an update on previous derivations, Mellor proposed a new formulation of the wave forcing for the total momentum equation. Here, the authors show that this derivation misses a leading-order term that has a zero depth-integrated value. Corrected for this omission, the wave forcing is equivalent to that in the first paper by Mellor. When this wave forcing effect on the currents is approximated it leads to an inconsistency. This study finally repeats and clarifies that the vertical integration of several various forms of the current-only momentum equations are consistent with the known depth-integrated equations for the mean flow momentum obtained by subtracting the wave momentum equation from the total momentum equation. Several other claims in prior Mellor manuscripts are discussed.

DOI： 10.1175/JPO-D-17-0065.1

Web of Science

Future Enhancement of Heavy Rainfall Events Associated with a Typhoon in the Midlatitude Regions Reviewed

Sachie Kanada, Kazuhisa Tsuboki, Hidenori Aiki, Satoki Tsujino, Izuru Takayabu

SOLA Vol. 13 page： 246 - 251 2017

Language：English Publishing type：Research paper (scientific journal) Publisher：METEOROLOGICAL SOC JAPAN

In August 2016, eastern Hokkaido in northern Japan had unusual typhoon landfalls and experienced heavy rainfall events that caused severe disasters. To understand the impact of global warming on typhoon-related rainfall in such midlatitude regions, numerical experiments on one of the typhoons in August 2016, Typhoon Chanthu, were conducted by using a high-resolution three-dimensional atmosphere-ocean coupled regional model in current and pseudo-global warming (PGW) climates. The amount, intensity, and duration of rainfall in eastern Hokkaido associated with the typhoon increased in the warming climate. The PGW typhoon traveled northward with relatively slower translation speed and resulted in a delay in the landfalls for 6 h. Furthermore, large amounts of near-surface water vapor > 22 g kg(-1) from the southern sea increased the convective instability around eastern Hokkaido and caused tall and intense updrafts. As a result, significant predecessor rainfall events with intense rainfall developed about 24 h before the typhoon landfall. Increased near-surface water vapor in the warming climate also enhanced rainfall associated with the typhoon passage over a widespread area. These results suggest that attention should be paid to future enhancement of heavy rainfall events in the midlatitude regions under global warming.

DOI： 10.2151/sola.2017-045

Web of Science

A Divergence-Form Wave-Induced Pressure Inherent in the Extension of the Eliassen-Palm Theory to a Three-Dimensional Framework for All Waves at All Latitudes Reviewed

Aiki Hidenori, Takaya Koutarou, Greatbatch Richard J.

JOURNAL OF THE ATMOSPHERIC SCIENCES Vol. 72 ( 7 ) page： 2822-2849 2015.7

A New Expression for the Form Stress Term in the Vertically Lagrangian Mean Framework for the Effect of Surface Waves on the Upper- Ocean Circulation Reviewed

Aiki Hidenori, Greatbatch Richard J.

JOURNAL OF PHYSICAL OCEANOGRAPHY Vol. 44 ( 1 ) page： 3-23 2014.1

Editorial-the 4th International Workshop on Modeling the Ocean (IWMO 2012) Reviewed

Oey Lie-Yauw, Miyazawa Yasumasa, Aiki Hidenori, Masumoto Yukio, Ezer Tal, Waseda Takuji

OCEAN DYNAMICS Vol. 63 ( 11-12 ) page： 1345-1347 2013.12

Layering and turbulence surrounding an anticyclonic oceanic vortex: in situ observations and quasi-geostrophic numerical simulations Reviewed

Hua Bach Lien, Menesguen Claire, Le Gentil Sylvie, Schopp Richard, Marsset Bruno, Aiki Hidenori

JOURNAL OF FLUID MECHANICS Vol. 731 2013.9

The Vertical Structure of the Surface Wave Radiation Stress for Circulation over a Sloping Bottom as Given by Thickness-Weighted-Mean Theory Reviewed

Aiki Hidenori, Greatbatch Richard J.

JOURNAL OF PHYSICAL OCEANOGRAPHY Vol. 43 ( 1 ) page： 149-164 2013.1

Thickness-Weighted Mean Theory for the Effect of Surface Gravity Waves on Mean Flows in the Upper Ocean Reviewed

Aiki Hidenori, Greatbatch Richard J.

JOURNAL OF PHYSICAL OCEANOGRAPHY Vol. 42 ( 5 ) page： 725-747 2012.5

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Papers - AIKI Hidenori