Desert heat island study in winter by mobile transect and remote sensing techniques
Desert heat island study in winter by mobile transect and remote sensing techniques
复制标题
利用移动样线和遥感技术研究冬季沙漠热岛
DOI：
10.1007/s00704-009-0120-2
复制
发表时间：
2009
影响因子：
3.4
通讯作者：
L. Prashad
中科院分区：
文献类型：
--
作者：
Chenghu Sun;A. Brazel;W. Chow;B. Hedquist;L. Prashad
城市环境中一个常见的问题是城市热岛（UHI），它可能会增加空调需求，提高污染水平，并可能改变降水模式。城市热岛效应的大小和模式一直是许多城市环境研究关注的主要问题。通常，干旱地区（如美国亚利桑那州凤凰城）的热岛震级研究主要集中在夏季。凤凰城（人口超过300万）的热岛震级超过5°C。本研究调查了初冬时期，即夏季潜在蒸散量从250 mm减少到<90 mm的时期。对凤凰城冬季热岛强度的分析研究很少，因此，借助汽车样带、固定站和遥感技术，我们调查了凤凰城大都市区被称为东谷的一部分。大都市区的东部边缘围绕着斜坡地形的断裂。观测到的最高热岛强度为bb0 8.0°C，与夏季热岛条件相当。通过对Oke（1998）天气因子ΦW的分析，确定了热诱导的夜间冷排水风可以解释冬季热岛震级的膨胀。
A familiar problem in urban environments is the urban heat island (UHI), which potentially increases air conditioning demands, raise pollution levels, and could modify precipitation patterns. The magnitude and pattern of UHI effects have been major concerns of a lot of urban environment studies. Typically, research on UHI magnitudes in arid regions (such as Phoenix, AZ, USA) focuses on summer. UHI magnitudes in Phoenix (more than three million population) attain values in excess of 5°C. This study investigated the early winter period—a time when summer potential evapotranspiration >250 mm has diminished to <90 mm. An analysis of the winter magnitude of the heat island in Phoenix has been studied very little, and therefore with the aid of automobile transects, fixed stations, and remote sensing techniques, we investigated a portion of the large Phoenix metropolitan area known as the East Valley. The eastern fringes of the metropolitan area abut against breaks in sloping terrain. The highest UHI intensity observed was >8.0°C, comparable to summertime UHI conditions. Through analysis of the Oke (1998) weather factor ΦW, it was determined thermally induced nighttime cool drainage winds could account for inflating the UHI magnitude in winter.