双月刊

ISSN 1006-9895

CN 11-1768/O4

昆明城市热岛效应的数值模拟研究
作者:
作者单位:

1.玉溪市气象局;2.南京信息工程大学大气物理学院;3.云南省气象局

作者简介:

通讯作者:

基金项目:

第二次青藏高原综合科学考察研究项目2019QZKK0105


A Numerical Simulation of Urban Heat Island Effect in Kunming
Author:
Affiliation:

1.College of Atmospheric Physics,Nanjing University of Information Science and Technology;2.Yunnan Meteorological Bureau,Kunming

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    摘要:

    本文利用WRF(V3.9.1)模式中耦合Noah/SLUCM方案作为Control案例,研究土地利用类型(Md04案例)、陆面过程(NoUCM案例)和湖泊(Nolake案例)对城市热岛强度及昆明城市气象要素水平、垂直的时空分布特征的影响。主要结论如下:(1)四种案例城市热岛强度的平均日变化基本一致。白天城市热岛强度较弱、夜间较强,在20:00时左右达到最大值。城市冠层(湖泊)对城市热岛有较明显的减(增)温,Control-NoUCM(Nolake)案例中,平均日最大差值为-0.79oC(+1.07oC)。(2)从能量平衡方程分析Control-Md04案例,感热(潜热)通量的差值为+46.18(-79.71)W/m2,潜热通量释放大于感热通量的绝对值。Control-NoUCM案例中,感热(潜热)通量的差值为-40.88(+29.60)W/m2,NoUCM案例未考虑几何建筑物储热与遮挡,大部分被地表所吸收,导致感热通量较大。(3)四种案例中,15:00(07:00)时边界层高度达到最大(小)值。NoUCM(Nolake)案例中城市边界层高度分别降低103m(32m)左右,而Md04案例中城市边界层高度增加102m左右。(4)湖泊对城市热岛环流影响的试验表明,湖泊上空垂直运动较弱,而水平方向湖陆风较大,有利于向城市输送水汽,增加干空气湿度,使水汽含量较高;从而增加潜热能量释放,降低感热通量,温度梯度减小。

    Abstract:

    In this paper, the coupling Noah/Single Layer Urban Canopy scheme coupled with WRF (V3.9.1) model is used as a control case to study the effects of land use type (Md04 scheme), land surface process (NoUCM scheme) and lake (Nolake scheme) on the intensity of urban heat island and the horizontal and vertical spatial distribution characteristics of urban meteorological elements in Kunming. The main conclusions are as follows: (1) The average daily variation of urban heat island intensity in four cases is basically the same. The UHI intensity is weak in the daytime and strong at night, and reaches the maximum at about 2000 BT. In the case of Control-NoUCM (Nolake), the average daily maximum difference is -0.79oc (+1.07oc). (2) From the energy balance equation analysis of Control-Md04 case, the difference of sensible heat (latent heat) energy is +46.18 (-79.71) w/m2,and the release of latent energy is greater than the absolute value of sensible energy. In the case of Control-NoUCM,the difference of sensible heat (latent heat) energy is -40.88 (+29.60) w/m2. NoUCM scheme does not consider the heat storage and shielding of geometric buildings, and most of them are absorbed by the surface, resulting in a large absolute value of sensible heat flux. (3) In the four cases, the boundary layer height reaches the maximum (minimum) value at 1500(0700) BT. The height of urban boundary layer in NoUCM (Nolake) decreased by about 103m (32m), while that in Md04 case increased by about 102m. (4) The experimental results of the influence of lakes on the circulation of urban heat island show that the vertical movement over the lake is weak, while the horizontal lake land wind is strong, which is conducive to the transportation of water vapor to the city, increasing the humidity of dry air and making the water vapor content higher, thus increasing the release of latent heat energy, reducing the sensible heat flux and reducing the temperature gradient.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2021-04-13
  • 最后修改日期:2021-05-26
  • 录用日期:2021-06-23
  • 在线发布日期:
  • 出版日期: