降水过程对断层CO_2气体异常排放响应的个例分析
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摘要
为了从观测事实的角度揭示岩石圈的热异常对大气圈的影响,本文利用怀来后郝窑测点的断层气CO_2排放观测数据和中国752站降水的逐日观测资料,分析了断层气CO_2异常排放与降水事件的时空演变联系.个例分析结果表明,断层气CO_2的异常排放会导致局地降水的增多.以1991年为例,伴随着断层气CO_2排放的异常增加,在大范围降水负异常的背景下,CO_2排放点周边区域出现显著的降水正异常(降水距平百分率大于零)区.同时,CO_2异常幅度较大的时段,相应的降水正异常区的中心值也较大.此外,分析降水响应断层气CO_2排放异常的时间还发现,断层气CO_2异常排放对其后10天内的降水过程影响最为显著.
In order to investigate the potential influence of thermal anomaly from the lithosphere on the aerosphere from the viewpoint of observational facts,the temporal and spatial relationship between abnormal fault CO_2 discharge and precipitation events is analysed,based on the data of CO_2 in fault product gas at Houhaoyao site in Hebei province and precipitation data from 752 meteorological stations in China.The results show that the anomaly of fault CO_2 emission is able to lead to local precipitation anomaly.During the period of CO_2 anomalies,there is always positive anomaly of precipitaion in the surrounding region of the epicenter under the background of large scale negative anomalies of precipitation.Meanwhile,it is found that a relatively larger magnitude of precipitation anomaly usually corresponds to a larger amplitude of CO_2 abnormal emission.In addtion,the analyses of the precipitation time series indicate that the fault CO_2 discharge has evident effects on the rainfall events within the following 10 days.
引文
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