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| 2006年夏季川渝地区伏旱与低频大气热源的关系 | |
| 引用本文： | 岑思弦,巩远发,秦宁生,赖欣,王霄,黄先伦.2006年夏季川渝地区伏旱与低频大气热源的关系[J].气象学报,2011,69(6):1009-1019. |
| 作者姓名： | 岑思弦 巩远发 秦宁生 赖欣 王霄 黄先伦 |
| 作者单位： | 1. 中国气象局成都高原气象研究所,成都,610072 2. 成都信息工程学院高原大气与环境研究中心,成都,610225 3. 河南省气象科技服务中心,郑州,450003 4. 阳江市气象局,广东阳江,529500 |
| 基金项目： | 国家自然科学基金，高原气象开放实验室基金课题，四川省气象局青年基金课题 |
| 摘 要： | 利用NCEP/NCAR再分析资料和中国地面观测站的逐日降水资料,研究了2006年夏季中国川渝地区的伏旱与亚洲地区大气低频振荡的联系.结果表明,2006年夏季中国川渝地区降水低频振荡的主要周期约为60 d；在川渝严重干旱期的7月下旬至8月上旬,经向上由于川渝地区上空低频热汇、广西和海南及其以西地区上空低频热源的影响,在1... |
| 关 键 词： | 低频振荡 大气热源(热汇) 川渝地区 伏旱 |
| 收稿时间： | 2009/12/1 0:00:00 |
| 修稿时间： | 2011/2/12 0:00:00 |
The relationship between the low-frequency oscillation atmospheric heating source/sink and the drought in the Sichuan-Chongqing region in summer of 2006 |
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| CEN Sixian,GONG Yuanf,QIN Ningsheng,LAI Xin,WANG Xiao and HUANG Xianlun.The relationship between the low-frequency oscillation atmospheric heating source/sink and the drought in the Sichuan-Chongqing region in summer of 2006[J].Acta Meteorologica Sinica,2011,69(6):1009-1019. | |
| Authors: | CEN Sixian GONG Yuanf QIN Ningsheng LAI Xin WANG Xiao and HUANG Xianlun |
| Institution: | Chengdu Institute of Plateau Meteorology, China Meteorology Administration, Chengdu 610072, China,Center for Plateau Atmospheric and Environmental Research, Chengdu University of Information Technology, Chengdu 610225, China,Chengdu Institute of Plateau Meteorology, China Meteorology Administration, Chengdu 610072, China,Center for Plateau Atmospheric and Environmental Research, Chengdu University of Information Technology, Chengdu 610225, China,Henan Service Center of Meteorological Sciences and Technology, Zhengzhou 450003, China and Yangjiang Meteorological Bureau, Yangjiang Guangdong 529500, China |
| Abstract: | In the summer of 2006, the severe drought occurred in the Sichuan-Chongqing region. In order to investigate the cause, using the NCEP/NCAR reanalysis data and the observed daily rainfall from the gauge stations, the relationship of the low frequency oscillation (LFO) atmospheric heating source/sink with the severe drought in the Sichuan-Chongqing region in the summer of 2006 has been studied. The results show that the summer rainfall in 2006 over the Sichuan-Chongqing region was dominated by the about 60 day oscillation; during the period of the severe drought in the Sichuan-Chongqing region from late July to early August, longitudinally, due to the influences of the LFO heat sink over the Sichuan Chongqing region and the LFO heat source over the Guangxi, Hainan and west of the region, there was a low frequency meridional circulation cell formed over the region between the 15°N and 40°N, whose downward branch of the circulation cell is just located over the Sichuan-Chongqing region; latitudinally, under the joint influences of the LFO heat sink over the Taiwan and its surrounding areas and the LFO heat source west of the Taiwan and its surrounding areas, the low-frequency zonal circulation cell was formed over the region between 105°E and 130°E and another secondary low-frequency zonal circulation cell emergenced over the region between 85°E and 105°E, which strengthened the low-frequency upward motion over the Guangxi and Hainan and west of the region, and thus further strengthened the low-frequency meridional circulation that was formed over the region between the 15°N and 40°N. As a result, on the one hand, it strengthened the low-frequency downward flow over the Sichuan-Chongqing region and, on the other hand, also strengthened the low-frequency divergence of the low-level flow over the Sichuan-Chongqing region. The difference of zonal distribution of the LFO further strengthened the downward flow over the Sichuan-Chongqing region, which might be the important cause why over the Sichuan Chongqing region the severe drought occurred in the summer of 2006 |
| Keywords: | Low-frequency oscillation (LFO) Atmospheric heating source/sink Sichuan Chongqing region Summer drought |
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