Influences of Oceanic Processes Between the Indian and Pacific Basins on the Eastward Propagation of MJO Events Crossing the Maritime Continent

Hu, Haibo; Li, Yiran; Yang, Xiu‐Qun; Wang, Rongrong; Mao, Kefeng; Yu, Peilong

doi:10.1029/2022jd038239

Cited by 4 publications

(1 citation statement)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hu et al, 2021;Wen et al, 2020), subseasonal oscillation (H. B. Hu et al, 2022aHu et al, , 2023a and subsurface ocean temperature (H. B. Hu et al, 2022b).…”

Section: Observed Datamentioning

confidence: 99%

Synergistic Effects of Upstream Disturbances and Oceanic Fronts on the Subseasonal Evolution of Western Pacific Jet Stream in Winter

Qian,

Hu,

Ren

et al. 2023

JGR Atmospheres

View full text Add to dashboard Cite

The Western Pacific jet stream (WPJS) is an essential part of atmospheric circulation in winter, which significantly influences the weather and climate of the North Pacific and North America. In this paper, the characteristics and mechanism of WPJS subseasonal variation in winter are investigated. The upstream atmospheric disturbances in the East Asian polar‐front jet (EAPJ) and subtropical jet (EASJ) merge over the Northwestern Pacific to form the subseasonal variability in WPJS, which has a significant period of 40‐60 days. During the positive phase events of subseasonal WPJS, the convergence position of the upstream atmospheric disturbances shifts southwardly accompanied with the local enhancement and eastward extension of subseasonal WPJS. On the other hand, the subseasonal WPJS divides into the southern and northern westerly branches during the negative phase events. By the horizontal propagation of local Eliassen‐Palm (E‐P) fluxes in the upper atmosphere, the northward drift of the upstream atmospheric disturbances convergence dominates the delayed acceleration of the northern upper westerly branch. However, the intensification of atmospheric baroclinicity and upward baroclinic energy caused by the leading strong subtropical frontal zone (STFZ) determine the acceleration of the southern upper westerly branch.

show abstract

“…Hu et al, 2021;Wen et al, 2020), subseasonal oscillation (H. B. Hu et al, 2022aHu et al, , 2023a and subsurface ocean temperature (H. B. Hu et al, 2022b).…”

Section: Observed Datamentioning

confidence: 99%

Synergistic Effects of Upstream Disturbances and Oceanic Fronts on the Subseasonal Evolution of Western Pacific Jet Stream in Winter

Qian,

Hu,

Ren

et al. 2023

JGR Atmospheres

View full text Add to dashboard Cite

show abstract

Impact of Arctic sea ice on the boreal summer intraseasonal oscillation

Xie,

Ha,

Zhu

et al. 2024

Clim Dyn

View full text Add to dashboard Cite

This study investigates the relationship between sea ice concentration (SIC) in the Arctic Ocean and the Boreal Summer Intraseasonal Oscillation (BSISO) from 1991 to 2020 and its underlying mechanism. A significantly positive (negative) correlation was found between the frequency of phase 7 (3) of BSISO1 (30–60 d) and the preceding winter SIC, which is located the north of the East Siberian-Beaufort Sea (ESBS). Compared with low-SIC years, the conditions including northeasterly vertical wind shear, an enhanced ascending branch of the anomalous Walker circulation, an eastward water vapour transport channel, and an increased humidity gradient induce active convection over the Philippine Sea in high-SIC years, which benefits (hinders) to phase 7 (3) of BSISO1. The positive SIC anomaly during the transition from winter to spring influences local temperature and pressure through anomalous local sensible heat flux. This anomaly induces wave activity flux from the ESBS, which converges over the Bering Sea, enhancing the Aleutian Low (AL). Subsequently, the AL triggers an anomalous subtropical anticyclone through wave-mean flow interaction in the North Pacific. Due to southerly wind stress and increased sea surface heat flux, positive sea surface temperature anomalies near Japan persist in the summer, heating the lower troposphere and increasing baroclinicity. Significant positive geopotential heights and anticyclone anomalies occur over Japan, accompanied by a negative vorticity anomaly. The enhanced ascending motion over the Philippine Sea, facilitated by Ekman pumping, favours convection and influences the frequency of phases 7 and 3.

show abstract

Classical and local similarity in problems of turbulent convection: Extension of Prandtl semi-empirical theory for horizontal layers of water and air mediums

Vulfson,

Nikolaev

2024

Physics of Fluids

View full text Add to dashboard Cite

A variant of the local similarity theory is considered, assuming a priori specification of two basic dimensional parameters: the second moment of vertical velocity and the “spectral” Prandtl mixing length. Such selection of basic parameters lets us interpret the algebraic formulas of Prandtl's semiempirical turbulence theory for the coefficients of turbulent heat transfer and kinetic energy dissipation as relationships of the local similarity theory. A priori approximations of the basic parameters are based on known relationships and consider the upper boundary of the convective layer as a solid wall. Within the framework of local similarity theory, approximations for the turbulent moments of buoyancy and vertical velocity of arbitrary order are also proposed. The correspondence of these approximations to experimental data has been established in both air and water mediums, as well as in the results of numerical modeling. Such correspondence allows us to conclude that a wide class of vertical profiles of turbulent moments in a windless convective layer depends only on two basic parameters: the second moment of vertical velocity and the “spectral” Prandtl mixing length. The obtained result indicates the universal nature of the theory of local similarity and is a significant addition to the semiempirical Prandtl theory.

show abstract

Influences of Oceanic Processes Between the Indian and Pacific Basins on the Eastward Propagation of MJO Events Crossing the Maritime Continent

Cited by 4 publications

References 53 publications

Synergistic Effects of Upstream Disturbances and Oceanic Fronts on the Subseasonal Evolution of Western Pacific Jet Stream in Winter

Synergistic Effects of Upstream Disturbances and Oceanic Fronts on the Subseasonal Evolution of Western Pacific Jet Stream in Winter

Impact of Arctic sea ice on the boreal summer intraseasonal oscillation

Classical and local similarity in problems of turbulent convection: Extension of Prandtl semi-empirical theory for horizontal layers of water and air mediums

Contact Info

Product

Resources

About