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mass human migration and the Urban Heat Island during the Chinese New Year Holiday: A Case Study in Harbin City, Northeast China

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Atmospheric and Oceanic Science Letters 2015年第2期8卷 63-66页

作者： WU Ling-Yun ZHANG Jing-Yong SHI Chun-Xiang State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Center for Monsoon System Research Institute of Atmospheric Physics Chinese Academy of Sciences National Meteorological Information Center China Meteorological Administration

Many Chinese people leave big cities for family reunions during the Chinese New Year （CNY）, which is the most important public holiday in China. However, how modem mass human migration during the CNY holiday affects the urban heat island （UHI） is still un- known. Here, the authors investigate the role of modem human migration for the UHI effects during the CNY holiday for the period of 1992-2006 in Harbin City, Northeast China. The results show that during the CNY week, the UHI effects expressed as daily mean, maxi- mum, and minimum temperature differences between urban and rural stations averaged over the period of 1992-2006 are 0.65℃ （43%）, 0.31℃ （48%）, and 1.14℃ （71%） lower than during the background period （four weeks before and four weeks after the CNY week）, re- spectively. Our findings identify previously unknown impacts of modem mass human migration on the UHI effects based on a case study in Harbin City.

关键词： urban heat island Chinese New Year holiday mass human migration surface air temperature Harbin City

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mass human migration and Beijing's urban heat island during the Chinese New Year holiday

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Science Bulletin 2015年第11期60卷 1038-1041,I0008页

作者：张井勇吴凌云远芳窦晶晶苗世光 Center for Monsoon System Research Institute of Atmospheric Physics Chinese Academy of Sciences State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences National Meteorological Information Center China Meteorological Administration Institute of Urban Meteorology China Meteorological Administration Chinese Academy of Meteorological Sciences

Population movements around the Chinese New Year （CNY）, which are much larger in recent years than before, are the largest annual human migration in the world. However, it is still largely unknown how or to what extent such mass human migration affects urban climate. Here, we investigate the role of mass human migration in influencing Beijing＇s urban heat island （UHI） during the CNY holiday for the period of 2004-2013. We find that the UHI effects expressed as daily mean （ATmean）, maximum （ATmax）, and minimum （ATmin） temperature differences between urban and rural areas show a weakening trend during the CNY week relative to the background period （4 weeks including 2-3 weeks before and 2-3 weeks after the CNY week）. In particular, large reductions occurred during the CNY week for the period of 2009-2013, when nearly half of population left the city before the CNY holiday. △Tmean, △Tmax, and △Tmin averaged over the period of 2009-2013 during the CNY week were 0.64, 0.45, and 0.83 ℃ lower than during the background period, representing relative reductions of 35 %, 66 %, and 27 %, respectively. Our findings highlight the important role of modem mass human migration for urban climate based on a case study in Beijing.

关键词： Urban heat island Chinese New Year holiday mass human migration Surface air temperature Beijing City

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