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Open AccessArticle

Intra-Urban Microclimate Effects on Phenology

1
Department of Social and Behavioral Sciences, Colorado Mesa University, 1100 North Ave, Grand Junction, CO 81501, USA
2
Department of Geography, College of Natural Resources and Environment, Virginia Tech, Blacksburg, VA 24061, USA
*
Author to whom correspondence should be addressed.
Urban Sci. 2018, 2(1), 26; https://doi.org/10.3390/urbansci2010026
Received: 1 January 2018 / Revised: 6 March 2018 / Accepted: 12 March 2018 / Published: 16 March 2018
(This article belongs to the Special Issue Urban Landscape Degradation and Restoration)
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Abstract

The urban heat island effect is commonly defined as the thermal differences between cooler rural and warmer urban areas, but it also refers to microclimatic differences within an urban area that arises from varied combinations of land cover related to different land uses. Microclimatic variations should also produce intra-urban differences in vegetation phenophases, although few studies have investigated urban phenology. Most phenological studies are usually regional to continental in scale, predominantly tracking changes in start of season related to climate change. This study reports results of an exploratory analysis using TIMESAT (Lund University, Lund, Sweden) software and MODIS NDVI 250-m resolution data (Goddard Space Flight Center, Greenbelt, MD, USA) to identify intra-urban differences in start of season for the City of Roanoke, Virginia. We compare these results to our in-situ temperature collection campaign. Additionally, we completed an in-situ start of season data collection by observing select tree species. Our results demonstrate that MODIS, processed by TIMESAT software, identified intra-urban start of season variations, and these variations are consistent with differing intra-urban microclimates and our in-situ start of season observations. Furthermore, results from such analyses can aid plans for increasing the urban tree canopy or in cultivating locations for urban agriculture—i.e., warmer areas with a longer growing season could accommodate warmer weather trees and crops. View Full-Text
Keywords: urban heat island; urban phenology; TIMESAT; MODIS; urban agriculture urban heat island; urban phenology; TIMESAT; MODIS; urban agriculture
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Parece, T.E.; Campbell, J.B. Intra-Urban Microclimate Effects on Phenology. Urban Sci. 2018, 2, 26.

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