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Open AccessArticle

Diurnal Variations of Surface and Air Temperatures on the Urban Streets in Seoul, Korea: An Observational Analysis during BBMEX Campaign

1
High Impact Weather Research Center, National Institute of Meteorological Sciences, Gangneung 25457, Korea
2
Research Center for Atmospheric Environment, Hankuk University of Foreign Studies, Yongin 17035, Korea
*
Author to whom correspondence should be addressed.
Atmosphere 2020, 11(1), 60; https://doi.org/10.3390/atmos11010060
Received: 29 November 2019 / Revised: 24 December 2019 / Accepted: 26 December 2019 / Published: 2 January 2020
(This article belongs to the Special Issue Urban Meteorology)
In this study, we used an intensive observation dataset of a mobile observation vehicle (MOVE) to investigate the characteristics of thermal environments and diurnal variations of road surface temperature (RST) and air temperature, particularly at the urban street level, during the 2019 Building Block 3-dimensional urban Meteorological Experiment (BBMEX) campaign in Seoul. For the purpose of comparing characteristics of RST and air temperature with different surrounding thermal environments, we divided the road into four sections (S1: Open Section, S2: High-Rise Buildings, S3: Low-Rise Buildings, S4: Street Trees). This study demonstrates that the greater sky view factors (SVFs) are generally coincident with the greater RSTs, with a significance at the 5% level. The diurnal variations indicated that the time lag between observed maximum air temperature and RST has about one hour, which is attributable to an increase air temperatures above artificial pavement through heat convection with some latency. The diurnal temperature ranges (DTRs) of RST in S2 and S4 were relatively smaller than those of S1 and S3, with differences ranging from 2.9 °C to 4.5 °C. The current results will assist planners and decision makers in determining policy priorities with regard to urban street design and planning. View Full-Text
Keywords: mobile observation vehicle; road surface temperature; sky view factor; diurnal temperature range mobile observation vehicle; road surface temperature; sky view factor; diurnal temperature range
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MDPI and ACS Style

Kim, Y.-J.; Jee, J.-B.; Kim, G.-T.; Nam, H.-G.; Lee, J.-S.; Kim, B.-J. Diurnal Variations of Surface and Air Temperatures on the Urban Streets in Seoul, Korea: An Observational Analysis during BBMEX Campaign. Atmosphere 2020, 11, 60.

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