| Characteristics and Numerical Simulation of the Tropical Intraseasonal Oscillations under Global Warming |
| |
| 作者姓名： | LIU Yunyun YU Yongqiang HE Jinhai ZHANG Zhenguo |
| |
| 作者单位： | Department of Atmospheric Sciences NUIST，LASG，Institute of Atmospheic Physics，Chinese Academy of Sciences，Department of Atmospheric Sciences，NUIST，Xinghua Meteorological Bureau of Jiangsu Province，Nanjing 210044 LASG，Institute of Atmospheic Physics，Chinese Academy of Sciences，Beijing 100029，Beijing 100029，Nanjing 210044，Xinghua 225700 |
| |
| 基金项目： | 国家自然科学基金;国家科技攻关计划 |
| |
| 摘 要： | Using the ECMWF reanalysis daily 200-hPa wind data during the two 20-yr periods from 1958 to 1977 and from 1980 to 1999,the characteristics and changes of Intraseasonal Oscillations (ISO) in the two periods associated with global warming are analyzed and compared in this study.It is found that during the last 20 years,the ISO has weakened in the central equatorial Pacific Ocean,but becomes more active in the central Indian Ocean and the Bay of Bengal;under the background of the global warming,increase in the amplitude of ISO intensity suggests that the ISO has become more active than before,with an obvious seasonal cycle,i.e.,strong during winter and spring,but weak during summer and autumn;the energy of the upper tropospheric zonal winds has more concentrated in wave numbers 1-3,and the frequency of ISO tended to increase. Comparison between the results of control experiment and CO_2 increase (1% per year) experiment of FGOALS-1.0g (developed at LASG) with the first and second 20-yr observations,is also performed. respectively.The comparative results show that the spatial structure of the ISO was well reproduced,but the strength of ISO was underestimated.On the basis of space-time spectral analysis,it is found that the simulated ISO contains too much high frequency waves,leading to the underestimation of ISO intensity due to the dispersion of ISO energy.However,FGOALS-1.0g captured the salient features of ISO under the global warming background by two contrast experiments,such as the vitality and frequency-increasing of ISO in the central Indian Ocean and the Bay of Bengal.
|
| 关 键 词： | 全球变暖 热带气候 耦合大气环流模型 气候变化 |
| 收稿时间： | 2007/5/23 0:00:00 |
Characteristics and Numerical Simulation of the Tropical Intraseasonal Oscillations under Global Warming |
| |
| LIU Yunyun,YU Yongqiang,HE Jinhai,ZHANG Zhenguo.Characteristics and Numerical Simulation of the Tropical Intraseasonal Oscillations under Global Warming[J].Acta Meteorologica Sinica,2007,21(4):438-499. |
| |
| Authors: | LIU Yunyun YU Yongqiang HE Jinhai ZHANG Zhenguo |
| |
| Institution: | [1]Department of Atmospheric Sciences, NUIST, Nanjing 210044 [2]LASG, Institute of Atmospheic Physics, Chinese Academy of Sciences, Beijing 100029 [3]Xinghua Meteorological Bureau of Jiangsu Province, Xinghua 225700 |
| |
| Abstract: | Using the ECMWF reanalysis daily 200-hPa wind data during the two 20-yr periods from 1958 to 1977 and from 1980 to 1999,the characteristics and changes of Intraseasonal Oscillations (ISO) in the two periods associated with global warming are analyzed and compared in this study.It is found that during the last 20 years,the ISO has weakened in the central equatorial Pacific Ocean,but becomes more active in the central Indian Ocean and the Bay of Bengal;under the background of the global warming,increase in the amplitude of ISO intensity suggests that the ISO has become more active than before,with an obvious seasonal cycle,i.e.,strong during winter and spring,but weak during summer and autumn;the energy of the upper tropospheric zonal winds has more concentrated in wave numbers 1-3,and the frequency of ISO tended to increase. Comparison between the results of control experiment and CO_2 increase (1% per year) experiment of FGOALS-1.0g (developed at LASG) with the first and second 20-yr observations,is also performed. respectively.The comparative results show that the spatial structure of the ISO was well reproduced,but the strength of ISO was underestimated.On the basis of space-time spectral analysis,it is found that the simulated ISO contains too much high frequency waves,leading to the underestimation of ISO intensity due to the dispersion of ISO energy.However,FGOALS-1.0g captured the salient features of ISO under the global warming background by two contrast experiments,such as the vitality and frequency-increasing of ISO in the central Indian Ocean and the Bay of Bengal. |
| |
| Keywords: | global warming tropical intraseasonal oscillation (ISO) coupled general circulation model (CGCM) |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《Acta Meteorologica Sinica》浏览原始摘要信息 |
| 点击此处可从《Acta Meteorologica Sinica》下载免费的PDF全文 |
|
