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科技日报北京8月9日电 (记者付丽丽)8日21时19分,四川阿坝藏族羌族自治州九寨沟县发生7.0级地震。记者9日从国家气候中心了解到,九寨沟震区(九寨沟、松潘、若尔盖)8月至9月气候特点为温度差异大,降水分布不均等。今年夏季以来,九寨沟降水量达251.1毫米,较常年同期偏多36%。
九寨沟震区地处川西北高原,地形复杂,最高海拔超过3000米,垂直气候明显,各地温度差异大,降水时空分布不均,全年降水量的80%集中于5月至10月。今年夏季以来,九寨沟降水量达251.1毫米,较常年同期偏多36%,其中7月28日降水量53.6毫米,突破历史极值。8月以来,九寨沟仍多雨,降水量60.4毫米,较常年同期偏多1.6倍。
国家气候中心统计了地震区域8月至9月的多年气候数据,结果显示,九寨沟8月上旬的降水量为25毫米左右,8月上中旬最大日降水量可达50毫米,8月下旬和9月中旬最大日降水量为35毫米左右,9月上旬的最大日降水量为45.4毫米。松潘8月上旬的降水量为23.5毫米,最大日降水出现在9月上旬为45.6毫米。若尔盖8月上旬的降水量为30毫米左右,8月下旬最大为58.9毫米。
气温方面,常年8月上旬至9月上旬,震区极端最高气温为25℃至30℃,九寨沟极端最高气温可超过35℃。进入9月以后气温下降较快,平均气温为10℃左右,最低气温会下降至-10℃(若尔盖),气温日变化也逐渐加大。
另外,震区常年大风日数8.1天,极大风速达21.9米/秒,冰雹日数4.9天,雷暴天数42.1天,其中九寨沟8月、9月和10月雷暴日数分别有3.9天、2.6天和1.6天。
专家提醒,灾后救援应密切关注天气预报,需加强防范滑坡、泥石流以及余震可能诱发的崩塌等次生灾害,减少降雨及次生灾害对交通运输和救灾工作的不利影响。
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