CHEN Jian-wen,HU Lin,WANG Juan-min,et al.Distribution Characteristics of the Mixed Layer Height in Shaanxi Province[J].Research of Soil and Water Conservation,2014,21(05):322-326,331.
陕西省混合层高度变化规律研究
- Title:
- Distribution Characteristics of the Mixed Layer Height in Shaanxi Province
- Keywords:
- Shaanxi Province; atmospheric stability; the mixed layer height; distribution characteristics
- 分类号:
- X16
- 摘要:
- 根据陕西省99个气象台站2006—2011年逐时气象观测资料，统计计算了各站四季及年平均混合层高度，并利用GIS系统绘制等值线分布图，分析了混合层高度的区域分布特征、四季和全年日变化特征。分析表明：（1）全年和四季平均混合层高度均以关中最高、陕北其次、陕南最低，其中陕北区域北部高、中部低，关中和陕南均为东北部高、西南部低；（2）各区域混合层高度均以春季最高，夏季其次，冬季最低，大致以冬季12月或1月最低，随后快速升高，4—5月达到最高，以后逐渐降低；（3）日变化均呈单峰型，日出后开始迅速升高，13：00前后达到最高，16：00开始迅速降低，日落后至次日日出前持续较低，春、夏季峰值持续时间较长，秋、冬季较短；（4）四季陕北和关中全天平均混合层高度差异不大，大部分时间关中略高于陕北；陕南春、夏季白天、秋季9：00—16：00、冬季10：00—15：00明显低于陕北和关中，而秋季18：00至次日7：00、冬季17：00至次日7：00大多高于陕北和关中。
- Abstract:
- This paper calculated the mixed layer height according to hourly observation data of the 99 meteorological stations in Shaanxi Province from 2006 to 2011, analyzed the characteristics of regional distribution, the four seasons and the daily variation of the mixed layer height by using GIS system. The results show that: ① for area distribution of annual and seasonal, the highest mixed layer height is in Guanzhong, followed by the northern Shaanxi, it is the lowest in southern Shaanxi. Among them, it is lower in northern Shaanxi area and higher in the middle area, it is higher in the northeast and lower in southwest in the other areas; ② regional mixing layer height is the highest in spring, followed the summer, minimum is in the winter. It is the lowest in December or January, then increased rapidly, it reached the highest in April or May, then gradually decreased; ③ daily variation presented unimodal, began to rise rapidly after sunrise, reached the highest at 13:00 PM, began to decrease rapidly at 16:00 PM, continued to be low after sunset until the next sunrise, the peak duration is longer in spring and summer peak duration, is shorter in autumn and winter; ④ the difference of average mixing layer height is not big, most of the time in the Guanzhong is slightly higher than that of northern Shaanxi; the daytime in spring and summer, 9:00 AM to 16:00 PM in autumn, 10:00 AM to 15:00 PM in winter of southern Shaanxi is significantly lower than that of northern Shaanxi and the Guanzhong, but 18:00 PM to 7:00 AM next day in autumn, 17:00 PM to 7:00 AM next day in winter of southern Shaanxi is mostly higher than that of northern Shaanxi and the Guanzhong.
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备注/Memo
收稿日期:2013-05-22;改回日期:2013-11-08。
基金项目:陕西省自然科学基础研究计划资助项目“基于相似理论的渭河致洪秋雨短期气候预测方法研究”（2012JM5012）；陕西省科技厅社发攻关项目（2012K12-01-03）；干旱气象科学研究基金项目（IAM201106）
作者简介:陈建文(1967-),男,陕西省南郑县人,高级工程师,主要从事环境影响评价、气候分析与应用、环境气象研究等工作。E-mail:chenjianween@126.com