摘要
利用西北四省(区)249个气象站1960至2016年3~6月的日降水资料,研究比较了以日降水量≥10毫米、15毫米作为标准,西北四省(区)春季第一场有效降水的气候特征差异。结果发现,以两种标准分析,西北四省(区)春季第一场符合条件降水出现的最早时间从区域上都是从东南自西北逐步推进,陕南南部出现最早,其次是关中、陕南北部,青海西部是出现最晚的区域,基本上出现在6月,甘肃河东大部、宁夏大部、青海东部大部是出现的次晚区域。从年代变化上看,甘肃河东是出现时间最稳定的区域,宁夏、陕西出现日期变化最大,青海西部与甘肃河西较一致,变化介于二者之间;同时,甘肃河西、关中陕南变晚趋势明显,其余区域变化趋势不明显。由于以上规定都未考虑干旱缓解情况,因此,后续还需要结合春季干旱缓解状况来研究制定西北区域春季第一场透雨的标准。
Based on the daily precipitation data of 249 meteorological stations in four provinces(regions)of northwest China from 1960 to march to June 2016,the climate characteristics of the first effective precipitation in spring in the four provinces(regions)of northwest China were studied and compared with the daily precipitation≥10 mm and 15 mm as the standard.The results show that the earliest time of the first qualified precipitation in spring in the four northwest provinces(regions)is gradually advancing from the southeast to the northwest in the region.The south of Shanxi appears the earliest,followed by Guanzhong and northern Shanxi.The western Qinghai is the latest region,which basically appears in June.Most of Gansu Hedong,Ningxia and Eastern Qinghai are out The present sub late region.From the perspective of chronological change,Hedong of Gansu Province is the most stable region,Ningxia and Shanxi province have the largest changes in the date,the western Qinghai and Gansu Hexi are more consistent,the change is between the two;at the same time,Gansu Hexi,Guanzhong and southern Shanxi tend to be late,and the other regions have no obvious change trend.Since the above provisions do not consider the drought mitigation,therefore,it is necessary to study and formulate the standard of the first soaking rain in spring in northwest China in combination with the situation of drought relief in spring.
出处
《大众科技》
2020年第12期21-25,44,共6页
Popular Science & Technology
基金
2020年度甘肃省高等学校产业支撑计划项目“‘一带一路’太阳能高辐射区光能开发潜力与利用效率评估研究及应用”。
关键词
西北四省(区)
春季第一场有效降水
气候特征
four provinces(regions)in northwest China
the first effective precipitation in spring
climate characteristics
