Minyang Wang

China Agricultural University

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Yan Du

South China Sea Institute Of Oceanology

Shang‐Ping Xie

University of California, San Diego

Yuhong Zhang

Chinese Academy of Sciences

Tianyu Wang

Peking University

Wei Wu

China Meteorological Administration

Zhiyou Jing

South China Sea Institute Of Oceanology

Shilin Tang

University of South China

Xiaolong Dong

Dalian Polytechnic University

Bo Qiu

University of Hawaiʻi at Mānoa

Xingwei Jiang

Shanghai Jiao Tong University

Cooperative Institutions

South China Sea Institute Of Oceanology

Institute of Oceanology

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)

China Agricultural University

Ocean University of China

Qingdao National Laboratory for Marine Science and Technology

Nanjing University of Information Science and Technology

Scripps Institution of Oceanography

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Merging Process of the Great Whirl and the Socotra Gyre in 2019

Journal of Geophysical Research Oceans (2023)

Lingxing Dai Xingwei Jiang Yifan Xia Minyang Wang Shilin Tang

Abstract The Great Whirl (GW) and the Socotra Gyre (SoG), two prominent anticyclonic eddies in the western Arabian Sea, exhibit strong dynamic interactions. This study reports a case of the merging of the GW and the SoG recorded by Argo floats in September 2019. Combined with satellite observations and a state‐of‐the‐art ocean reanalysis, we show that the merging process was first detected at the subsurface layer (∼150 m depth) rather than the surface. As the original water inside the GW is cooler than the SoG, the merging created a baroclinic structure between the eddies. The density gradients associated with the baroclinic structure drive strong subsurface geostrophic currents following the thermal wind relationship, leading to the fast merging at 100–200 m depth. Energy analysis shows that the predominant energy source for the merged eddy was the barotropic and baroclinic instability. The dissipative processes caused the rapid decay of the merged eddy. The merging process induced submesoscale activities and promoted ocean vertical exchanges south of Socotra Island.

Barotropic fluid

Eddy

Anticyclone

Argo

Geostrophic current

10.1029/2023jc020145

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Citations (0)

Mechanism of seasonal eddy kinetic energy variability in the eastern equatorial Pacific Ocean

Journal of Geophysical Research Oceans (2017)

Minyang Wang Yan Du Bo Qiu Xuhua Cheng Yiyong Luo

Abstract Enhanced mesoscale eddy activities or tropical instability waves (TIWs) exist along the northern front of the cold tongue in the eastern equatorial Pacific Ocean. In this study, we investigate seasonal variability of eddy kinetic energy (EKE) over this region and its associated dynamic mechanism using a global, eddy‐resolving ocean general circulation model (OGCM) simulation, the equatorial mooring data, and satellite altimeter observations. The seasonal‐varying enhanced EKE signals are found to expand westward from 100°W in June to 180°W in December between 0°N and 6°N. This westward expansion in EKE is closely connected to the barotropically‐baroclinically unstable zonal flows that are in thermal‐wind balance with the seasonal‐varying thermocline trough along 4°N. By adopting an 1½‐layer reduced‐gravity model, we confirm that the seasonal perturbation of the thermocline trough is dominated by the anticyclonic wind stress curl forcing, which develops due to southerly winds along 4°N from June to December.

Ekman transport

Anticyclone

Mooring

Trough (economics)

10.1002/2017jc012711

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Citations (16)

Pacific TIW intensity from observations and model simulation

Zenodo (CERN European Organization for Nuclear Research) (2023)

Minyang Wang

The repository includes three files. One is the Matlab code (.m) for the shallow water diagnostic model for the TIW (tropical instability waves) surface velocity from altimeter SSH (sea surface heigh). One is the input data (.mat) for the diagnostic model. Last is the estimated TIW intensity from four datasets (.mat), including altimeter-derived EKE (eddy kinetic energy) (1993-2021), in situ mooring-observed EKE (1980s-2020), high-resolution ocean model simulated EKE (1958-2021), and satellite-observed variance of SST (sea surface temperature) meridional gradient (1982-2021). The TIW-associated variability is defined as 60-day and 3000-km high-pass filterred with only westward wavenumbers retained. The EKE and variance of SST meridional gradient are averaged annually from June to February.

Intensity

10.5281/zenodo.7996702

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Circulation structure and dynamic characteristics of Western Tropical Indian Ocean associated with monsoon transitions

Deep Sea Research Part I Oceanographic Research Papers (2022)

Zhangzhe Zhao Wei Wu Minyang Wang Yan Du

Ekman transport

Boundary current

East Asian Monsoon

10.1016/j.dsr.2022.103943

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Citations (1)

A Common Base Mode of Asian Summer Monsoon Variability across Timescales

Journal of Climate (2021)

Xudong Wang Shang‐Ping Xie Zhaoyong Guan Minyang Wang

Abstract The summer intraseasonal oscillation (ISO) is characterized by a northward-moving rainband in the Indo–western Pacific warm pool region. The physical origin of the ISO is not fully understood, as it is masked by strong interaction of convection and circulation. This study examines intraseasonal to interannual variability during June–August over the Indo–western Pacific warm pool region. The results show that the tropical northwest Pacific anomalous anticyclone (NWP-AAC) is a fundamental mode on both intraseasonal and interannual time scales, destabilized by the monsoon mean state, specifically through barotropic energy conversion and convective feedback in the low-level confluence between the monsoon westerlies and easterly trade winds. On the interannual time scale, the NWP-AAC shows a biennial tendency, reversing phase from the summer of El Niño to the summer that follows; the AAC in post–El Niño summer is excited indirectly through sea surface temperature anomalies in the Indo–NWP. On the intraseasonal time scale, the column-integrated moisture advection causes the NWP-AAC-related convection to propagate northward. Our results provide a unifying view of multiscale Asian summer monsoon variability, with important implications for subseasonal to seasonal prediction.

Anticyclone

Madden–Julian oscillation

Westerlies

Rainband

Barotropic fluid

10.1175/jcli-d-20-0856.1

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Citations (13)

Redox cascade reaction for kinetic resolution of racemic α-methylbenzylamine and biosynthesis of α-phenylethanol

Applied Microbiology and Biotechnology (2022)

Jinbin Liu Minyang Wang Liang Chen Huaxiang Deng Xiaohong Yu

Biocatalysis

Kinetic resolution

Acetophenone

Transaminase

Biotransformation

10.1007/s00253-022-12299-x

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Citations (3)

The Impact of the Eastern Pacific Fresh and Warm Pools on the Bimodal Seasonality of Barrier Layers

Journal of Geophysical Research Oceans (2023)

Jianwei Chi Yan Du Jifeng Qi Minyang Wang Ruyan Chen

Abstract Observations of Argo profiles and TAO/TRITON array confirm the significant seasonality of the barrier layer (BL) and temperature inversion (TI) in the northeastern tropical Pacific (NETP). Statistical result of the occurrence based on the Argo profiles reveals a bimodal variability of the BL, with two peaks in July and October. This bimodal seasonality of BL is attributed to the out‐of‐phase variations of the eastern Pacific fresh and warm pools. The fresh and warm pools both expand westward from May to July, when the Inter‐Tropical Convergence Zone (ITCZ) becomes intense and broad. Heavy rainfall is the dominant contributor to the extension of the fresh and warm pools, leading to a high frequency of thick BL (40%). This frequent thick BL provides a precondition for its another development after August. The fresh pool is stable from August to November, while the warm pool contracts sharply. The cold tongue becomes active due to a prevailing trade wind and horizontal advection transports surface cold water to the northeastern warm pool. This cold advection deepens the isothermal layer and contributes to a frequent TI (30%) and thick BL (46%). The results suggest that the ITCZ rainfall and northward cold advection from equator dominate the upper layer stratification of NETP in summer and autumn, respectively.

Argo

Seasonality

Intertropical Convergence Zone

Stratification (seeds)

10.1029/2022jc018876

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Citations (1)

Dynamics on Seasonal Variability of EKE Associated with TIWs in the Eastern Equatorial Pacific Ocean

Journal of Physical Oceanography (2019)

Minyang Wang Yan Du Bo Qiu Shang‐Ping Xie Ming Feng

Abstract Energetic mesoscale eddies (vortices) associated with tropical instability waves (TIWs) exist in the eastern equatorial Pacific Ocean between 0° and 8°N. This study examines the seasonal variations in eddy kinetic energy (EKE) of TIWs using in situ and satellite observations and elucidates the underlying dynamical mechanisms. The results reveal that the cross-equatorial southerly winds are key to sustaining the high-level EKE (up to ~600 cm 2 s −2 ) from boreal summer to winter in 0°–6°N and 155°–110°W. Because of the β effect and the surface wind divergence, the southerly winds generate anticyclonic wind curls north of the equator that intensify the sea surface temperature (SST) fronts and force the downwelling annual Rossby waves. The resultant sea surface height ridge induces strong horizontal current shears between 0° and 5°N. The intensified current shears and SST fronts generate EKE via barotropic and baroclinic instabilities, respectively. To the extent that the seasonal migration of a northward-displaced intertropical convergence zone intensifies the southerly winds north of, but not south of, the equator, our study suggests that the climatic asymmetry is important for the oceanic eddy generations in the eastern equatorial Pacific Ocean—a result with important implications for coupled climate simulation/prediction.

Barotropic fluid

Sea-surface height

Anticyclone

Geostrophic current

Eddy

Kelvin wave

Downwelling

10.1175/jpo-d-18-0163.1

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Citations (20)

Ocean surface current multiscale observation mission (OSCOM): Simultaneous measurement of ocean surface current, vector wind, and temperature

Progress In Oceanography (2021)

Yan Du Xiaolong Dong Xingwei Jiang Yuhong Zhang Di Zhu

Ocean observations

Ocean surface topography

Sea-surface height

Physical oceanography

Boundary current

10.1016/j.pocean.2021.102531

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Citations (50)

Sea Surface Salinity Change since 1950: Internal Variability versus Anthropogenic Forcing

Journal of Climate (2020)

Qiwei Sun Yan Du Shang‐Ping Xie Yuhong Zhang Minyang Wang

Abstract Using an eastern tropical Pacific pacemaker experiment called the Pacific Ocean–Global Atmosphere (POGA) run, this study investigated the internal variability in sea surface salinity (SSS) and its impacts on the assessment of long-term trends. By constraining the eastern tropical Pacific sea surface temperature variability with observations, the POGA experiment successfully simulated the observed variability of SSS. The long-term trend in POGA SSS shows a general pattern of salty regions becoming saltier (e.g., the northern Atlantic) and fresh regions becoming fresher, which agrees with previous studies. The 1950–2012 long-term trend in SSS is modulated by the internal variability associated with the interdecadal Pacific oscillation (IPO). Due to this variability, there are some regional discrepancies in the SSS 1950–2012 long-term change between POGA and the free-running simulation forced with historical radiative forcing, especially for the western tropical Pacific and southeastern Indian Ocean. Our analysis shows that the tropical Pacific cooling and intensified Walker circulation caused the SSS to increase in the western tropical Pacific and decrease in the southeastern Indian Ocean during the 20-yr period of 1993–2012. This decadal variability has led to large uncertainties in the estimation of radiative-forced trends on a regional scale. For the 63-yr period of 1950–2012, the IPO caused an offset of ~40% in the radiative-forced SSS trend in the western tropical Pacific and ~170% enhancement in the trend in the southeastern Indian Ocean. Understanding and quantifying the contribution of internal variability to SSS trends helps improve the skill for estimates and prediction of salinity/water cycle changes.

Forcing (mathematics)

SSS*

10.1175/jcli-d-20-0331.1

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Citations (15)