The impact of E1 Nino on the precipitation in China for different seasons are investigateddiagnostically. It is found that E1 Nino can influence the precipitation in China significantly duringits mature phase. In the ...The impact of E1 Nino on the precipitation in China for different seasons are investigateddiagnostically. It is found that E1 Nino can influence the precipitation in China significantly duringits mature phase. In the Northern winter, spring and autumn, the positive precipitation anomaliesare found in the southern part of China during the E1 Nino mature phase. In the Northernsummer, the patterns of the precipitation anomalies in the E1 Nifio mature phase are different fromthose in the other seasons. The negative precipitation anomalies appear in both southern andnorthern parts of China, while in between around the lower reaches of the Yangtze River and theHuaihe River valleys the precipitation anomalies tend to be positive.In the Northern winter, spring and autumn, the physical process by which E1 Nino affects theprecipitation in the southern part of China can be explained by the features of the circulationanomalies over East Asia during the E1 Nino mature phase (Zhang et al. 1996). The appearance ofan anticyclonic anomaly to the north of the maritime continent in the lower troposphere during theE1 Nino mature phase intensifies the subtropical high in the western Pacific and makes it shiftwestward. The associated southwesterly flow is responsible for the positive precipitation anomaliesin the southern part of China. In the Northern summer, the intensified western Pacific subtropicalhigh covers the southeastern periphery of China so that the precipitation there becomes less. In addition, the weakening of the indian monsoon provides less moisture inflow to the northern part ofChina.展开更多
用研究灾变规律的关键时方法分析了El Nio、La Nia事件和太阳活动对河南省东亚飞蝗 (Locus ta migratoria manilensis Meyen) 的影响。结果发现, El No和La Nia事件不会促使河南省沿黄地区东亚飞蝗的大发生, 并得出El Ni no和L...用研究灾变规律的关键时方法分析了El Nio、La Nia事件和太阳活动对河南省东亚飞蝗 (Locus ta migratoria manilensis Meyen) 的影响。结果发现, El No和La Nia事件不会促使河南省沿黄地区东亚飞蝗的大发生, 并得出El Ni no和La Ni na事件对飞蝗大发生的影响主要通过影响其发生地的天气、气候 (主要是降水), 从而影响飞蝗的大发生。在太阳黑子相对数高年的后一年, 河南省东亚飞蝗大发生的可能性超过90%。展开更多
基于1979—2021年的ERA5再分析资料,研究了副极地海洋锋区(Subarctic Frontal Zone,SAFZ)海温(Sea Surface Temperature,SST)异常相关的冬季海气相互作用过程及其影响次年冬季厄尔尼诺(El Ni o)的机制。研究表明,冬季SAFZ的特征海气异...基于1979—2021年的ERA5再分析资料,研究了副极地海洋锋区(Subarctic Frontal Zone,SAFZ)海温(Sea Surface Temperature,SST)异常相关的冬季海气相互作用过程及其影响次年冬季厄尔尼诺(El Ni o)的机制。研究表明,冬季SAFZ的特征海气异常表现为大尺度的SST暖异常与偶极型的大气环流异常。在SAFZ海气相互作用过程中,海洋首先通过直接的非绝热加热影响低层大气斜压性,随后通过间接的瞬变涡旋反馈使相当正压的位势高度异常在整个冬季内维持。其中,南部的气旋式环流异常通过减弱副热带的平均信风激发太平洋经向模态(Pacific Meridional Mode,PMM)与风—蒸发—SST(Wind-Evaporation-SST,WES)反馈,从而使中纬度SST暖异常南传至热带太平洋中部,随后导致El Ni o发生。然而,并非所有的SAFZ暖异常事件都能激发次年冬季的El Ni o,中纬度海气耦合异常的初始配置及同期热带太平洋的表现情况将对中纬度信号南传至热带的过程产生较大的影响。展开更多
文摘The impact of E1 Nino on the precipitation in China for different seasons are investigateddiagnostically. It is found that E1 Nino can influence the precipitation in China significantly duringits mature phase. In the Northern winter, spring and autumn, the positive precipitation anomaliesare found in the southern part of China during the E1 Nino mature phase. In the Northernsummer, the patterns of the precipitation anomalies in the E1 Nifio mature phase are different fromthose in the other seasons. The negative precipitation anomalies appear in both southern andnorthern parts of China, while in between around the lower reaches of the Yangtze River and theHuaihe River valleys the precipitation anomalies tend to be positive.In the Northern winter, spring and autumn, the physical process by which E1 Nino affects theprecipitation in the southern part of China can be explained by the features of the circulationanomalies over East Asia during the E1 Nino mature phase (Zhang et al. 1996). The appearance ofan anticyclonic anomaly to the north of the maritime continent in the lower troposphere during theE1 Nino mature phase intensifies the subtropical high in the western Pacific and makes it shiftwestward. The associated southwesterly flow is responsible for the positive precipitation anomaliesin the southern part of China. In the Northern summer, the intensified western Pacific subtropicalhigh covers the southeastern periphery of China so that the precipitation there becomes less. In addition, the weakening of the indian monsoon provides less moisture inflow to the northern part ofChina.
文摘用研究灾变规律的关键时方法分析了El Nio、La Nia事件和太阳活动对河南省东亚飞蝗 (Locus ta migratoria manilensis Meyen) 的影响。结果发现, El No和La Nia事件不会促使河南省沿黄地区东亚飞蝗的大发生, 并得出El Ni no和La Ni na事件对飞蝗大发生的影响主要通过影响其发生地的天气、气候 (主要是降水), 从而影响飞蝗的大发生。在太阳黑子相对数高年的后一年, 河南省东亚飞蝗大发生的可能性超过90%。
文摘基于1979—2021年的ERA5再分析资料,研究了副极地海洋锋区(Subarctic Frontal Zone,SAFZ)海温(Sea Surface Temperature,SST)异常相关的冬季海气相互作用过程及其影响次年冬季厄尔尼诺(El Ni o)的机制。研究表明,冬季SAFZ的特征海气异常表现为大尺度的SST暖异常与偶极型的大气环流异常。在SAFZ海气相互作用过程中,海洋首先通过直接的非绝热加热影响低层大气斜压性,随后通过间接的瞬变涡旋反馈使相当正压的位势高度异常在整个冬季内维持。其中,南部的气旋式环流异常通过减弱副热带的平均信风激发太平洋经向模态(Pacific Meridional Mode,PMM)与风—蒸发—SST(Wind-Evaporation-SST,WES)反馈,从而使中纬度SST暖异常南传至热带太平洋中部,随后导致El Ni o发生。然而,并非所有的SAFZ暖异常事件都能激发次年冬季的El Ni o,中纬度海气耦合异常的初始配置及同期热带太平洋的表现情况将对中纬度信号南传至热带的过程产生较大的影响。
