Urbanization-induced regional warming in Yangtze RiverDelta: potential role of anthropogenic heat release
Urbanization-induced regional warming in Yangtze RiverDelta: potential role of anthropogenic heat release
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城市化引起的长江三角洲区域变暖：人为放热的潜在作用
DOI：
10.1002/joc.4296
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Xiuqun Yang
中科院分区：
文献类型：
--
作者：
Xiaomei Wang;Xuguang Sun;Jianping Tang;Xiuqun Yang
随着长江三角洲地区城市化进程的加快，大量的人类活动产生的热量被释放到大气中，对当地的气候造成了越来越严重的影响。为了解人为热释放在城市化引起的区域变暖中的作用，利用高分辨率（3 km）WRF模式，在不同城市土地利用和人为热释放配置下进行了7年（2001-2007）的试验。结果表明，AHR对长江中下游地区的增暖作用并不局限于局部城市，在相同的AHR作用下，冬季的增暖作用比夏季更为显著，尤其是在冬季夜间。此外，它还可以降低（略有增加）冬（夏）季的温度日较差。相反，城市冠层效应（由农村向ULU的转变）在夏季产生的增温作用强于冬季，且在冬、夏两季都能降低DTR。AHR对城市感热通量的贡献在冬季和冬夜较大，而在夏季和夏夜较小，是AHR引起的增温和DTR特征的主要原因。在没有环境风影响的情况下，AHR引起的变暖集中在城市，并均匀传播。在盛行风作用下，其强度较小，并向下风向城市边缘移动，形成沿着风向的增温带，有利于将相邻的AHR增温联系起来。另一方面，AHR引起的变暖取决于与AHR排放总量成比例的城市规模。
Accompanying with the rapid urbanization in Yangtze River Delta (YRD), large amounts of anthropogenic heat are released into the atmosphere, which is becoming a more and more severe issue for the local climate. To understand what role anthropogenic heat release (AHR) plays in the urbanization-induced regional warming, high-resolution (3 km) Weather Research and Forecast WRF model experiments are carried out for 7 years (2001-2007) with different configurations of urban land use (ULU) and AHR. The results show that AHR can cause notable warming in almost the whole YRD rather than confining to the local cities where it releases, which is more significant in winter than in summer if the same amounts of AHR apply, especially at winter night. And furthermore, it can decrease (somewhat increase) the diurnal temperature range (DTR) in winter (summer). On the contrary, urban canopy effect due to the change from rural to ULU can produce a stronger warming in summer than in winter, and always reduce DTR in both winter and summer. Contribution of AHR to the sensible heat flux in urban regions is responsible for those AHR-caused warming and DTR features, because it is larger in winter and at winter night but much smaller in summer and at summer night. Without ambient wind effect, AHR-caused warming centres in cities and spreads around homogeneously. However, under the prevailing wind, it has less magnitude, shifts to the downwind city edges and forms a warming belt along the wind direction, which may favour linking the adjacent AHR-caused warming together. On the other hand, AHR-caused warming depends on the city sizes that are proportional to the total amount of AHR emitted.