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地球科学进展  2010, Vol. 25 Issue (10): 1070-1081    DOI: 10.11867/j.issn.1001-8166.2010.10.1070
研究论文     
陇中黄土高原夏季陆面辐射和热量特征研究
李宏宇1,2,张强1,2,3,王胜1,2
1.兰州大学大气科学学院,半干旱气候变化教育部重点实验室 ,甘肃兰州 730000;
2. 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,甘肃兰州730020;
3.甘肃省气象局,甘肃兰州 730020
Research on Characteristics of Land-surface Radiation and Heat Budget over the Loess Plateau of Central Gansu in Summer
Li Hongyu1,2,Zhang Qiang1,2,3,Wang Sheng1,2
1.College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China;
2. Institute of Arid Meteorology,CMA;Key laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province;Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA,Lanzhou 730020,China;
3. Gansu Provincial Meteorological Bureau, Lanzhou 730020, China
 全文: PDF(15968 KB)  
摘要:

利用兰州大学半干旱气候与环境观测站(SACOL)的观测资料,分析了陇中黄土高原夏季陆面辐射和热量收支的特征。通过研究不同典型天气条件对陆面过程微气象特征的影响,发现地表反射率在晴天会出现早晨偏大的不对称结构;晴天与多云天气相比不平衡量较大,而阴天时的阵性降水会使局地能量收支出现不平衡。利用最小二乘法(OLS)线性回归得到的夏季平均不闭合度是19.6%。在半干旱区云和降水对辐射和能量收支的影响不容忽视,达到约25%的削弱程度,比极端干旱的敦煌荒漠区要大,又进一步证明了半干旱区夏季的平均气候特征与云量较多的多云天气(5≤Mean total cloud amount<8)接近。另外,7月日平均波恩比最大是4.1,平均是1.95,比极端干旱区的敦煌波恩比小1个数量级,说明榆中所处的黄土高原半干旱区比敦煌所处的极端干旱区在气候上要湿润很多。

关键词: 陇中黄土高原不同天气条件辐射收支地表能量平衡平均气候特征    
Abstract:

 Utilizing the data observed at the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL), characteristics of land surface radiation and energy budget over the Loess Plateau of  central  Gansu in summer are analyzed in this paper. By studying the impacts of different weather conditions on micrometeorological characteristics, the asymmetric structure of diurnal variation of surface albedo appears in the morning of sunny days with larger albedo values. The surface energy budget on a sunny day has a larger amount of imbalance, compared with that on a cloudy day. Besides ,the shower on an obscure day can also lead to large energy imbalance. The unclosure of energy balance obtained by using OLS(Ordinary Least Squares) linear regression method is 19.6%.In the semi-arid area,the clouds and the precipitation cause about 25% disturbances to each component of energy balance. Weakening impact of clouds and precipitation on surface energy budget is apparent and much stronger than Dunhuang Gobi. Furthermore, it shows that the mean climatic characteristics in summer relatively close to those of cloudy days with more clouds(5≤Mean total cloud amount <8). Moreover, the maximum daily average Bowen ratio in July reaches 4.1 and the monthly mean value is 1.95. The Bowen ratio in Yuzhong is much smaller than that in Dunhuang Gobi, which  indicates  the semiarid area is more humid than the extreme arid area.

Key words: Loess Plateau in the     central     part of Gansu    Different synoptic conditions    Radiation budget    Surface energy balance    Mean climatic characteristics.
收稿日期: 2010-04-06 出版日期: 2010-10-10
:  P404  
基金资助:

国家自然科学基金重点项目“黄土高原陆面过程观测与试验研究”(编号:40830957)资助.

通讯作者: 李宏宇     E-mail: aridlhy@qq.com
作者简介: 李宏宇(1987-),男,河北衡水人,硕士研究生,主要从事边界层气象和陆面过程的研究. E-mail:aridlhy@qq.com
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李宏宇,张强,王胜. 陇中黄土高原夏季陆面辐射和热量特征研究[J]. 地球科学进展, 2010, 25(10): 1070-1081.

Li Hongyu,Zhang Qiang,Wang Sheng. Research on Characteristics of Land-surface Radiation and Heat Budget over the Loess Plateau of Central Gansu in Summer. Advances in Earth Science, 2010, 25(10): 1070-1081.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2010.10.1070        http://www.adearth.ac.cn/CN/Y2010/V25/I10/1070

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