中文摘要：

城市化影响局地气温观测记录,是气候变化领域关注的问题之一。曾有研究认为,近几十年中国气温观测中城市化增温达0.1°C/10年甚至更高。然而,近年基于均一化观测而得到的结果要小得多。其中的不确定性主要源于数据质量和评估方法。典型例子如‘观测减再分析（OMR）’方法。由于再分析资料中的多年代际变率相对于实际气温观测存在系统性偏差,该方法通常会高估城市化效应。近年发展的高分辨率气候模拟及动态陆面演变信息将有助于理解和量化城市化效应。

英文摘要：

There have long been arguments about the impact of urbanization on local meteorological observations. This letter reviews up-to-date studies of the urbanization-related warming in the observed land surface air temperature series in China. Many previous studies have suggested that, over the past few decades, the local warming due to urbanization could have been about 0.1 °C/10 yr, or even larger. However, based on recently developed homogenized temperature records, the estimated urban bias is smaller. Major uncertainties arise from either the data quality or the techniques used to estimate the urbanization effect. A key example is the ‘observationminus-reanalysis＇ method, which tends to overestimate the urban signal in this region, partly due to systematic bias in the multi-decadal variability of surface air temperature in the reanalysis data. It is expected that improved numerical modeling with high-resolution information regarding the changing land surface in the region will help to further understand and quantify the effect of urbanization in local temperature records.