Simulations of the East Asian Subtropical     Westerly Jet by LASG/IAP AGCMs

GUO Lanli; ZHANG Yaocun; WANG Bin; LI Lijuan; ZHOU Tianjun; BAO Qing

doi:10.1007/s00376-008-0447-0

Volume 25 Issue 3

May 2008

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 2008 > 25(3): 447-457

Simulations of the East Asian Subtropical Westerly Jet by LASG/IAP AGCMs

1.
Department of Atmospheric Sciences, Nanjing University, Nanjing 210093;Department of Atmospheric Sciences, Nanjing University, Nanjing 210093;National Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;National Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;National Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;National Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029

doi: 10.1007/s00376-008-0447-0

Abstract
References
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Abstract:
Performances of two LASG/IAP (State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics/Institute of Atmospheric Physics) Atmospheric General Circulation Models (AGCMs), namely GAMIL and SAMIL, in simulating the major characteristics of the East Asian subtropical westerly jet (EASWJ) in the upper troposphere are examined in this paper. The mean vertical and horizontal structures and the correspondence of the EASWJ location to the meridional temperature gradient in the upper troposphere are well simulated by two models. However, both models underestimate the EASWJ intensity in winter and summer, and are unable to simulate the bimodal distribution of the major EASWJ centers in mid-summer, relative to the observation, especially for the SAMIL model. The biases in the simulated EASWJ intensity are found to be associated with the biases of the meridional temperature gradients in the troposphere, and furthermore with the surface sensible heat flux and condensation latent heating. The models capture the major characteristics of the seasonal evolution of the diabatic heating rate averaged between 30--45N, and its association with the westerly jet. However, the simulated maximum diabatic heating rate in summer is located westward in comparison with the observed position, with a relatively strong diabatic heating intensity, especially in GAMIL. The biases in simulating the diabatic heating fields lead to the biases in simulating the temperature distribution in the upper troposphere, which may further affect the EASWJ simulations. Therefore, it is necessary to improve the simulation of the meridional temperature gradient as well as the diabatic heating field in the troposphere for the improvement of the EASWJ simulation by GAMIL and SAMIL models.
- East Asian subtropical westerly jet,
- GAMIL,
- SAMIL,
- Diabatic heating
References

[1]	KUANG Xueyuan, ZHANG Yaocun, 2005: Seasonal Variation of the East Asian Subtropical Westerly Jet and Its Association with the Heating Field over East Asia, ADVANCES IN ATMOSPHERIC SCIENCES, 22, 831-840. doi: 10.1007/BF02918683
[2]	WU Zhiwei, LI Jianping, 2008: Prediction of the Asian-Australian Monsoon Interannual Variations with the Grid-Point Atmospheric Model of IAP LASG (GAMIL), ADVANCES IN ATMOSPHERIC SCIENCES, 25, 387-394. doi: 0.1007/s00376-008-0387-8
[3]	ZHOU Baiquan, NIU Ruoyun, ZHAI Panmao, 2015: An Assessment of the Predictability of the East Asian Subtropical Westerly Jet Based on TIGGE Data, ADVANCES IN ATMOSPHERIC SCIENCES, 32, 401-412. doi: 10.1007/s00376-014-4026-2
[4]	YANG Junli, WANG Bin, GUO Yufu, WAN Hui, JI Zhongzhen, 2007: Comparison Between GAMIL, and CAM2 on Interannual Variability Simulation, ADVANCES IN ATMOSPHERIC SCIENCES, 24, 82-88. doi: 10.1007/s00376-007-0082-1
[5]	Yu ZHAO, Anmin DUAN, Guoxiong WU, 2018: Interannual Variability of Late-spring Circulation and Diabatic Heating over the Tibetan Plateau Associated with Indian Ocean Forcing, ADVANCES IN ATMOSPHERIC SCIENCES, 35, 927-941. doi: 10.1007/s00376-018-7217-4
[6]	Yuanchang DONG, Guoping LI, Xiaolin XIE, Long YANG, Peiwen ZHANG, Bo ZENG, 2024: Mechanism of Diabatic Heating on Precipitation and the Track of a Tibetan Plateau Vortex over the Eastern Slope of the Tibetan Plateau, ADVANCES IN ATMOSPHERIC SCIENCES, 41, 155-172. doi: 10.1007/s00376-023-2275-7
[7]	LI Lijuan, WANG Bin, Yuqing WANG, Hui WAN, 2007: Improvements in Climate Simulation with Modifications to the Tiedtke Convective Parameterization in the Grid-Point Atmospheric Model of IAP LASG (GAMIL), ADVANCES IN ATMOSPHERIC SCIENCES, 24, 323-335. doi: 10.1007/s00376-007-0323-3
[8]	ZHANG Xu, Hai LIN, JIANG Jing, 2012: Global Response to Tropical Diabatic Heating Variability in Boreal Winter, ADVANCES IN ATMOSPHERIC SCIENCES, 29, 369-380. doi: 10.1007/s00376-011-1049-9
[9]	LI Lijuan, Yuqing WANG, WANG Bin, ZHOU Tianjun, 2008: Sensitivity of the Grid-point Atmospheric Model of IAP LASG (GAMIL1.1.0) Climate Simulations to Cloud Droplet Effective Radius and Liquid Water Path, ADVANCES IN ATMOSPHERIC SCIENCES, 25, 529-540. doi: 10.1007/s00376-008-0529-z
[10]	ZUO Jinqing, LI Weijing, SUN Chenghu, XU Li, and REN Hong-Li, 2013: Impact of the North Atlantic sea surface temperature tripole on the East Asian summer monsoon, ADVANCES IN ATMOSPHERIC SCIENCES, 30, 1173-1186. doi: 10.1007/s00376-012-2125-5
[11]	Lijuan WANG, Aiguo DAI, Shuaihong GUO, Jing GE, 2017: Establishment of the South Asian High over the Indo-China Peninsula During Late Spring to Summer, ADVANCES IN ATMOSPHERIC SCIENCES, 34, 169-180. doi: 10.1007/s00376-016-6061-7
[12]	WU Chunqiang, ZHOU Tianjun, SUN De-Zheng, BAO Qing, 2011: Water Vapor and Cloud Radiative Forcings over the Pacific Ocean Simulated by the LASG/IAP AGCM: Sensitivity to Convection Schemes, ADVANCES IN ATMOSPHERIC SCIENCES, 28, 80-98. doi: 10.1007/s00376-010-9205-1
[13]	WANG Zaizhi, MAO Jiangyu, WU Guoxiong, 2008: The Wavenumber-Frequency Characteristics of the Tropical Waves in an Aqua-Planet GCM, ADVANCES IN ATMOSPHERIC SCIENCES, 25, 541-554. doi: 10.1007/s00376-008-0541-3
[14]	Yu Rucong, Li Wei, Zhang Xuehong, LiuYimin, Yu Yongqiang, Liu Hailong, Zhou Tianjun, 2000: Climatic Features Related to Eastern China Summer Rainfalls in the NCAR CCM3, ADVANCES IN ATMOSPHERIC SCIENCES, 17, 503-518. doi: 10.1007/s00376-000-0014-9
[15]	Lingkun RAN, Changsheng CHEN, 2016: Diagnosis of the Forcing of Inertial-gravity Waves in a Severe Convection System, ADVANCES IN ATMOSPHERIC SCIENCES, 33, 1271-1284. doi: 10.1007/s00376-016-5292-y
[16]	Chanh Q. KIEU, Da-Lin ZHANG, 2012: Is the Isentropic Surface Always Impermeable to the Potential Vorticity Substance?, ADVANCES IN ATMOSPHERIC SCIENCES, 29, 29-35. doi: 10.1007/s00376-011-0227-0
[17]	Xinyu LI, Riyu LU, Gen LI, 2021: Different Configurations of Interannual Variability of the Western North Pacific Subtropical High and East Asian Westerly Jet in Summer, ADVANCES IN ATMOSPHERIC SCIENCES, 38, 931-942. doi: 10.1007/s00376-021-0339-0
[18]	YANG Jing, Bin WANG, WANG Bin, LI Lijuan, 2009: The East Asia-Western North Pacific Boreal Summer Intraseasonal Oscillation Simulated in GAMIL 1.1.1, ADVANCES IN ATMOSPHERIC SCIENCES, 26, 480-492. doi: 10.1007/s00376-009-0480-7
[19]	ZHANG Yaocun, HUANG Danqing, 2011: Has the East Asian Westerly Jet Experienced a Poleward Displacement in Recent Decades?, ADVANCES IN ATMOSPHERIC SCIENCES, 28, 1259-1265. doi: 10.1007/s00376-011-9185-9
[20]	Li Weiping, Theo Chidiezie Chineke, Liu Xin, Wu Guoxiong, 2001: Atmospheric Diabatic Heating and Summertime Circulation in Asia-Africa Area, ADVANCES IN ATMOSPHERIC SCIENCES, 18, 257-269. doi: 10.1007/s00376-001-0018-0