Interdecadal variations of the western Pacific subtropical high and surface heat flux over East Asia and their relationship

2011 ◽  
Vol 25 (2) ◽  
pp. 156-165 ◽  
Author(s):  
Mi Yan ◽  
Yongfu Qian ◽  
Jian Liu
Keyword(s):  
Heat Flux ◽  
East Asia ◽  
Surface Heat Flux ◽  
Western Pacific Subtropical High ◽  
Surface Heat ◽  
Western Pacific ◽  
Subtropical High ◽  
The Western Pacific

scholarly journals Catastrophe and Mechanism Analyses of Multiple Equilibria in the Western Pacific Subtropical High System Based on Objective Fitting of Spatial Basis Functions

2016 ◽  
Vol 144 (3) ◽  
pp. 997-1015 ◽  
Author(s):  
Mei Hong ◽  
Ren Zhang ◽  
Yijia Hu ◽  
Yu Dandan ◽  
Guorong Jiang
Keyword(s):  
Heat Flux ◽  
Latent Heat ◽  
Latent Heat Flux ◽  
Western Pacific Subtropical High ◽  
Basis Functions ◽  
Western Pacific ◽  
Subtropical High ◽  
Dynamical Mechanism ◽  
Function Decomposition ◽  
The Western Pacific

Abstract Scholars have been showing great interest in revealing the mechanisms that govern the activities of the western Pacific subtropical high (WPSH). However, the problem currently remains unresolved. In this paper, a new model is developed to reveal the dynamical mechanism of the WPSH abnormal activities. Variables in the partial differential vorticity equations based on latent heat flux are separated in space and time using Galerkin methods. To overcome three deficiencies of the traditional highly truncated spectral method, spatial basis functions are reconstructed from observation field time series based on a combination of empirical orthogonal function decomposition and genetic algorithm. Based on the atmospheric vorticity equation, nonlinear ordinary differential equations of the WPSH can be obtained using an objective spatial basis function. Moreover, dynamical characteristics and actions, such as bifurcation and catastrophe induced by latent heat flux factors, are analyzed. Results show that the latent heat flux field in the Indian Ocean and the Bay of Bengal region determines the formation and rupture of the WPSH (such as the “double ridge” phenomenon). The enhancements of land–sea heating contrast and latent heat flux field in the South China Sea lead to WPSH abnormal activities and WPSH circulation anomalies, such as subtropical high northward jump and rapid westward extension. Linked with the real weather phenomena and the diagnostic analysis of the previous studies, the credibility of the bifurcation and catastrophe analysis is confirmed. This work documents new areas of research on the evolution mechanism of the WPSH under the action of latent heat flux from the view of chaotic dynamics.

scholarly journals A Dynamic Index for the Westward Ridge Point Variability of the Western Pacific Subtropical High during Summer

2017 ◽  
Vol 30 (9) ◽  
pp. 3325-3341 ◽  
Author(s):  
Ruowen Yang ◽  
Zhiang Xie ◽  
Jie Cao
Keyword(s):  
East Asia ◽  
Atmospheric Circulation ◽  
Outgoing Longwave Radiation ◽  
Longwave Radiation ◽  
Western Pacific Subtropical High ◽  
Western Pacific ◽  
Subtropical High ◽  
Dynamic Index ◽  
The Impact ◽  
The Western Pacific

Based on the ridge line of the western Pacific subtropical high (WPSH) and the theory of gradient wind approximation, a dynamic index for the westward ridge point (WRPI) of the WPSH is defined. Owing to its definition, the new dynamic index can be used to analyze the evolution of the WPSH at various time scales over most isobaric surfaces. The WRPI comprises two dimensions labeled ZWRPI and MWRPI, which depict the zonal and meridional movement, respectively, of the westward ridge point of the WPSH. The rationality and reliability of the dynamic index were validated using reanalysis atmospheric circulation, outgoing longwave radiation, surface air temperature, and rainfall data. The WRPI series revealed that the westward ridge point of the WPSH generally advances poleward while withdrawing eastward. Furthermore, there were close relationships between the WRPI, atmospheric circulation, outgoing longwave radiation, and precipitation over East Asia and the western Pacific in summer. The significant correlation coefficients indicated that the ZWRPI and the MWRPI can reflect the impact of the zonal and meridional movement of the WPSH on the climate over East Asia and the western Pacific. The ZWRPI has no significant linear trend at the interdecadal time scale, indicating that the WPSH did not significantly extend westward in summer. The slight decrease of the MWRPI suggests that the WPSH moves southward but with an insignificant trend. Compared with indices proposed in previous studies, the WRPI showed advantages in objectivity, reliability, predictability, practicability, and therefore extensive potential for application.

scholarly journals Relationship Analysis between Runoff of Dadu River Basin and El Niño

2018 ◽  
Vol 246 ◽  
pp. 01074
Author(s):  
Zujian Zou ◽  
Yubin He
Keyword(s):  
River Basin ◽  
El Niño ◽  
El Nino ◽  
Western Pacific Subtropical High ◽  
Western Pacific ◽  
Subtropical High ◽  
Tibet Plateau ◽  
Rainfall Runoff ◽  
Dadu River ◽  
The Western Pacific

The Dadu River Basin is located in the transitional zone between the Qinghai-Tibet Plateau and the Sichuan Basin. It is alternately affected by various weather systems such as the western Pacific subtropical high, the Qinghai-Tibet high (anti-cyclone), the southwest warm and humid air current, and the southeast monsoon. The western Pacific subtropical high is one of the main influencing factors of rainfall runoff in the basin. During the El Niño period, the western Pacific subtropical high moved eastward and the position was southward. The warm and humid airflow and the southeast monsoon northward changed, and the rainfall runoff in the Dadu River Basin changed.By analyzing the development of the El Niño phenomenon, Divide an El Niño process into different stages of occurrence, development, and end. Combining the characteristics of the Dadu River runoff in each stage, Studying the runoff situation of the Dadu River Basin under different strengths and weaknesses of the El Niño phenomenon. Using the correlation method to establish a model of the relationship between the abundance of the Dadu River Basin and the El Niño strength and weakness. Providing new ideas and new methods for the accurate prediction of the incoming water of the Dadu River under the abnormal climatic conditions of El Niño. It provides technical support for reservoir dispatching, flood control dispatching and economic dispatching of cascade hydropower stations, and provides experience for other river basins to cope with complex climate situations and improve water regime forecasting levels.

scholarly journals The Changing Impact Mechanisms of a Diverse El Niño on the Western Pacific Subtropical High

2019 ◽  
Vol 46 (2) ◽  
pp. 953-962 ◽  
Author(s):  
Mengyan Chen ◽  
Jin‐Yi Yu ◽  
Xin Wang ◽  
Wenping Jiang
Keyword(s):  
El Niño ◽  
El Nino ◽  
Western Pacific Subtropical High ◽  
Western Pacific ◽  
Subtropical High ◽  
The Western Pacific

Reconstructing the western boundary variability of the Western Pacific Subtropical High over the past 200 years via Chinese cave oxygen isotope records

2018 ◽  
Vol 52 (5-6) ◽  
pp. 3741-3757 ◽  
Author(s):  
Jingyao Zhao ◽  
Hai Cheng ◽  
Yan Yang ◽  
Liangcheng Tan ◽  
Christoph Spötl ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
Western Pacific Subtropical High ◽  
Western Pacific ◽  
Subtropical High ◽  
Western Boundary ◽  
The Past ◽  
The Western Pacific
Sign in / Sign up

Export Citation Format

Share Document