Mechanism for asymmetric atmospheric responses in the western North Pacific to El Nino and La Nina

被引:11
作者
Wang, Xiaohui [1 ]
Li, Tim [1 ,2 ]
Chen, Mingcheng [1 ]
机构
[1] Nanjing Univ Informat Sci & Technol, Joint Int Res Lab Climate & Environm Change ILCEC, Key Lab Meteorol Disaster, Minist Educ KLME,CIC FEMD, Nanjing, Jiangsu, Peoples R China
[2] Univ Hawaii Manoa, Sch Ocean & Earth Sci & Technol, Dept Atmospher Sci, Int Pacific Res Ctr, Honolulu, HI 96822 USA
关键词
Asymmetry; El Nino; La Nina; Moist enthalpy; Moist static energy; ASIAN SUMMER MONSOON; THERMODYNAMIC PROCESSES; ANOMALOUS ANTICYCLONE; INTERDECADAL VARIATIONS; CIRCULATION ANOMALIES; PART II; OSCILLATION; ROLES; SSTS;
D O I
10.1007/s00382-019-04767-4
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The cause of asymmetric atmospheric circulation responses over the tropical western North Pacific (WNP) to El Nino and La Nina was investigated through observational analyses and idealized modeling experiments. Firstly, column integrated moisture and moist static energy budget analyses were carried out to reveal the cause of asymmetric precipitation anomalies over the WNP. The result indicates that negative nonlinear moist enthalpy advection anomalies occur in both El Nino and La Nina, and they tend to induce a negative precipitation anomaly in the key WNP region and thus an anomalous anticyclone during both El Nino and La Nina winters. This, together with linear moist enthalpy advection, results in an asymmetric atmospheric circulation response. Secondly, the relative roles of the nonlinear moist enthalpy advection and the zonal shift of longitudinal location of anomalous heating over the central-eastern Pacific between El Nino and La Nina were investigated through an anomaly general circulation model. It is found that both the nonlinear advection and the zonally asymmetric heating contribute equally to the observed zonal shift of the anomalous WNP anticyclonic and cyclonic circulation centers between El Nino and La Nina.
引用
收藏
页码:3957 / 3969
页数:13
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