Natural ventilation effects on temperatures within Stevenson screens
Natural ventilation effects on temperatures within Stevenson screens
复制标题
自然通风对史蒂文森屏内温度的影响
DOI：
10.1002/qj.537
复制
发表时间：
2010
影响因子：
8.9
通讯作者：
Richard Harrison
中科院分区：
文献类型：
--
作者：
Richard Harrison
在低风速下，温度计屏的特性很差。将大温度计屏幕上的温度与自动遮蔽的露天细导线电阻温度计的温度进行了比较。对于2008年7月至2009年期间获得的大多数5分钟平均测量值，屏幕和细金属丝温度非常一致，中位数差异<0.05 °C。然而，在低风速下，会出现较大的温差。当无风时（风速为2米，u2，≤ 0.1 m s−1），屏幕温度和室外温度之间的差异在−0.25 °C到+0.87 °C之间变化。在u2 < 0.5 m s−1的夜晚，这一差值为−0.14 °C至0.39 °C，很少达到−0.68 °C至1.38 °C。在每日温度循环的最低点，阅读的半城市站点在1997-2008年的观测中有52%的u2 < 1 m s-1，34%的u2 < 0.5 m s-1，20%的平静条件。因此，最低温度测量的不确定性可能是由于通风不良造成的，这种不确定性可能通过计算传播到日平均温度。与日最低温度相比，0900 UTC天气温度测量具有低得多的平静条件丰度（5%）。皇家气象学会
Thermometer screen properties are poorly characterised at low wind speeds. Temperatures from a large thermometer screen have been compared with those from an automatically shaded open‐air fine‐wire resistance thermometer. For the majority of 5‐minute average measurements obtained between July 2008 and 2009, the screen and fine‐wire temperatures agreed closely, with a median difference <0.05 °C. At low wind speeds however, larger temperature differences occurred. When calm (wind speed at 2 metres, u2, ≤ 0.1 m s−1), the difference between screen and open‐air temperatures varied from −0.25 °C to +0.87 °C. At night with u2 < 0.5 m s−1, this difference was −0.14 °C to 0.39 °C, and, rarely, up to −0.68 °C to 1.38 °C. At the minimum in the daily temperature cycle, the semi‐urban site at Reading had u2 < 1 m s−1 for 52% of the observations 1997–2008, u2 < 0.5 m s−1 for 34% and calm conditions for 20%. Consequently uncertainties in the minimum temperature measurements may arise from poor ventilation, which can propagate through calculations to daily average temperatures. In comparison with the daily minimum temperature, the 0900 UTC synoptic temperature measurement has a much lower abundance (5%) of calm conditions. Copyright © 2010 Royal Meteorological Society