高原气象

高原气象 >

2016 , Vol. 35 >Issue 2: 385 - 396

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00153

论文

干旱半干旱区边界层变化特征及其影响因子分析

  • 李岩瑛 ,
  • 张强 ,
  • 张爱萍 ,
  • 陈英 ,
  • 杨梅
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  • 中国气象局兰州干旱气象研究所, 甘肃省干旱气候变化与减灾重点实验室/中国气象局干旱气候变化与减灾重点开放实验室, 兰州 730020;2. 甘肃省武威市气象局, 武威 733000;3. 民勤县气象站, 民勤 733300

收稿日期: 2014-07-10

  网络出版日期: 2016-04-28

基金资助

干旱气象科学研究基金项目(IAM201307)

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Analysis on Atmosphere Boundary Layer Variation Characteristics and Their Impact Factors in Arid Region and Semi-Arid Region over Northwest China

  • LI Yanying ,
  • ZHANG Qiang ,
  • ZHANG Aiping ,
  • CHEN Ying ,
  • YANG Mei
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  • Key laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/Key Open Laboratory of Arid Climatic Change and Disaster Reduction of China Meteorological Administration/Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;2. Wuwei Meteorological Bureau in Gansu Province, Wuwei 733000, China;3. Minqin Meteorological Station, Minqin 733300, China

Received date: 2014-07-10

  Online published: 2016-04-28

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摘要

利用中国西北干旱区民勤、半干旱区榆中和半干旱半湿润区平凉三站2006-2012年逐日08:00和20:00(北京时)探空资料,及1961-2012年地面要素资料,应用位温廓线法计算和对比分析了对流边界层厚度、稳定边界层厚度的时间变化特征及其影响因子。结果表明,对流边界层厚度中民勤的较深厚,最厚出现在5-6月,达3300 m以上;平凉的较浅薄,最厚出现在4-6月,平凉最厚达2700 m,榆中达2300 m;稳定边界层厚度中干旱区民勤较低约在500 m,而半干旱区的榆中较厚在1200~1400 m。边界层厚度与最高地温差关系较为密切,呈显著正相关,干旱区民勤较密切,其相关系数接近0.9,而平凉还与风速密切相关,榆中对流边界层厚度与极大风速的相关系数高达0.8以上。近50年来边界层厚度在民勤和平凉呈减少趋势,而在榆中呈增加趋势,其原因是尽管近50年来最高地温差均在线性增加,但风速仅榆中增加,平凉白天降水量减小较为显著。影响边界层厚度的主要因子是最高地温差和风速,平凉还与白天降水量有关。

关键词： 对流边界层厚度; 稳定边界层厚度; 影响因子; 西北干旱区和半干旱区

本文引用格式

李岩瑛 , 张强 , 张爱萍 , 陈英 , 杨梅 . 干旱半干旱区边界层变化特征及其影响因子分析[J]. 高原气象, 2016 , 35(2) : 385 -396 . DOI: 10.7522/j.issn.1000-0534.2014.00153

Abstract

Using daily sounding data of three stations over northwest China which were Minqin in arid area, Yuzhong in semi-arid region and Pingliang in semi-arid and semi-humid region at 08:00 (Beijing Time, the same as after) and 20:00 from 2006 to 2012, and the ground elements data from 1961 to 2012, the time variation characteristics and influencing factors of troposphere boundary thickness, stable boundary thickness were calculated and comparatively analyzed by potential temperature profile method. The results showed that in the troposphere boundary thickness, Minqin of arid regions was deeper, the thicker layer was above 3300 m appeared from May to June; semi-arid region was more shallow, whose most thick appears from April to June, thickness of Pingliang was above 2700 m, that of Yuzhong was above 2300 m. In the stable boundary layer thickness, Minqin of arid regions was about 500 m, but Yuzhong of semi-arid region was thicker between 1200 m and 1400 m. The boundary layer thickness was most closely to maximum Ts-Ta, showed a significant positive correlation, there was most closely related in Minqin of arid whose coefficient was up to 0.9, and Pingliang of semi-arid area was also closely related to wind speed, the correlation coefficient of troposphere boundary thickness and maximum wind speed in Yuzhong was bigger than 0.8. In recent 50 years, the boundary layer thicknesses of Minqin and Pingliang showed decreasing trends, but that of Yuzhong showed an increasing trend, the reason was although maximum differences between soil temperature and air temperature (Ts-Ta) were all increased linearly in three stations, only wind speed of Yuzhong was increased, and daytime precipitation of Pingliang was decreased obviously. The main factors of affecting boundary layer thickness were maximum Ts-Ta and wind speed, further that of Pingliang was also related to daytime precipitation.

Key words： Troposphere boundary; Stable boundary laye; Impact factors; Northwest arid regio

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