A statistical study of the monsoon trough and associated tropical cyclogenesis over the western North Pacific

被引:0
作者
Feng, Tao [1 ,2 ,3 ]
Zheng, Tao [3 ]
机构
[1] Hohai Univ, Key Lab Marine Hazards Forecasting, Minist Nat Resources, Nanjing, Peoples R China
[2] Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai, Peoples R China
[3] Hohai Univ, Coll Oceanog, Nanjing, Peoples R China
来源
TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES | 2021年 / 32卷 / 06期
基金
中国国家自然科学基金;
关键词
Tropical cyclogenesis; Monsoon trough; Daily genesis rate; UPPER-TROPOSPHERIC TROUGH; SYNOPTIC-SCALE WAVES; SOUTH CHINA SEA; CYCLONE ACTIVITY; INTERANNUAL VARIATION; DISTURBANCES; OSCILLATION; VARIABILITY; GENESIS; IMPACT;
D O I
10.3319/TAO.2021.12.15.02
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Previous studies have suggested that a strong monsoon trough is favorable for tropical cyclogenesis over the western North Pacific. This study reexamined the relationship between the monsoon trough and tropical cyclogenesis using a recently developed daily monsoon trough index that captures the seasonal generation of tropical cyclones (TCs). The connection between the value of the index and the morphology of the monsoon trough is established for further categorization and composition. During 1979 - 2020, a total of 734 (57.3%) TC formations were associated with an active monsoon trough, while 42.7% TCs formed when the monsoon trough was categorized as inactive. With a climatological genesis rate of 8.4%, the daily genesis rate ranged from 13.9 to 24.6% with an active monsoon trough, which was significantly higher than that without an active monsoon trough. The genesis rate gradually increased with the intensification of a monsoon trough with a peak of 24.6% when an extraordinarily strong monsoon trough existed, with approximately one TC formation every four days. The intensity of the monsoon trough affected the favored TC genesis latitude and longitude, and a stronger monsoon trough favored northeastward generation, exhibiting different track types due to different steering flows.
引用
收藏
页码:1215 / 1226
页数:12
相关论文
共 61 条
[1]  
Briegel LM, 1997, MON WEATHER REV, V125, P1397, DOI 10.1175/1520-0493(1997)125<1397:LSIOTC>2.0.CO
[2]  
2
[3]   Effects of Monsoon Trough Intraseasonal Oscillation on Tropical Cyclogenesis over the Western North Pacific [J].
Cao, Xi ;
Li, Tim ;
Peng, Melinda ;
Chen, Wen ;
Chen, Guanghua .
JOURNAL OF THE ATMOSPHERIC SCIENCES, 2014, 71 (12) :245-266
[4]   Effects of monsoon trough interannual variation on tropical cyclogenesis over the western North Pacific [J].
Cao, Xi ;
Li, Tim ;
Peng, Melinda ;
Chen, Wen ;
Chen, Guanghua .
GEOPHYSICAL RESEARCH LETTERS, 2014, 41 (12) :4332-4339
[5]   Tropical cyclogenesis induced by ITCZ breakdown in association with synoptic wave train over the western North Pacific [J].
Cao, Xi ;
Chen, Guanghua ;
Chen, Wen .
ATMOSPHERIC SCIENCE LETTERS, 2013, 14 (04) :294-300
[6]  
Dickinson M, 2002, J ATMOS SCI, V59, P2183, DOI 10.1175/1520-0469(2002)059<2183:MRGWAW>2.0.CO
[7]  
2
[8]  
Emanuel KA, 2004, B AM METEOROL SOC, V85, P666
[9]   Reexamination of the Climatology and Variability of the Northwest Pacific Monsoon Trough Using a Daily Index [J].
Feng, Tao ;
Yang, Xiu-Qun ;
Sun, Xuguang ;
Yang, Dejian ;
Chu, Cuijiao .
JOURNAL OF CLIMATE, 2020, 33 (14) :5919-5938
[10]   Convective Coupling in Tropical-Depression-Type Waves. Part II: Moisture and Moist Static Energy Budgets [J].
Feng, Tao ;
Yu, Jia-Yuh ;
Yang, Xiu-Qun ;
Huang, Ronghui .
JOURNAL OF THE ATMOSPHERIC SCIENCES, 2020, 77 (10) :3423-3440