The western Pacific subtropical high and tropical cyclone landfall: Seasonal forecasts using the Met Office GloSea5 system

2019 ◽  
Vol 145 (718) ◽  
pp. 105-116 ◽  
Author(s):  
Joanne Camp ◽  
Malcolm J. Roberts ◽  
Ruth E. Comer ◽  
Peili Wu ◽  
Craig MacLachlan ◽  
...  
Keyword(s):  
Tropical Cyclone ◽  
Western Pacific Subtropical High ◽  
Western Pacific ◽  
Subtropical High ◽  
Seasonal Forecasts ◽  
The Western Pacific ◽  
Tropical Cyclone Landfall

Sensitivity of Tropical Cyclone Feedback on the Intensity of the Western Pacific Subtropical High to Microphysics Schemes

2015 ◽  
Vol 72 (4) ◽  
pp. 1346-1368 ◽  
Author(s):  
Yuan Sun ◽  
Zhong Zhong ◽  
Wei Lu
Keyword(s):  
Tropical Cyclone ◽  
Critical Role ◽  
Western Pacific Subtropical High ◽  
Melting Process ◽  
Western Pacific ◽  
Subtropical High ◽  
Freezing Level ◽  
Arw Model ◽  
Microphysical Parameterization ◽  
The Western Pacific

Abstract The Advanced Research version of Weather Research and Forecasting (WRF-ARW) Model is used to examine the sensitivity of a simulated tropical cyclone (TC) track and the associated intensity of the western Pacific subtropical high (WPSH) to microphysical parameterization (MP) schemes. It is found that the simulated WPSH is sensitive to MP schemes only when TCs are active over the western North Pacific. WRF fails to capture TC tracks because of errors in the simulation of the WPSH intensity. The failed simulation of WPSH intensity and TC track can be attributed to the overestimated convection in the TC eyewall region, which is caused by inappropriate MP schemes. In other words, the MP affects the simulation of the TC activity, which influences the simulation of WPSH intensity and, thus, TC track. The feedback of the TC to WPSH plays a critical role in the model behavior of the simulation. Further analysis suggests that the overestimated convection in the TC eyewall results in excessive anvil clouds and showers in the middle and upper troposphere. As the simulated TC approaches the WPSH, the excessive anvil clouds extend far away from the TC center and reach the area of the WPSH. Because of the condensation of the anvil clouds’ outflows and showers, a huge amount of latent heat is released into the atmosphere and warms the air above the freezing level at about 500 hPa. Meanwhile, the evaporative (melting) process of hydrometers in the descending flow takes place below the freezing level and cools the air in the lower and middle troposphere. As a result, the simulated WPSH intensity is weakened, and the TC turns northward earlier than in observations.

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
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