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UHI Study Shows Temperature Variation Across City

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  UHI Study Shows Temperature Variation Across City Sam Wormley <swormley1@gmail.com> - 2015-11-22 20:01 -0600
    Re: UHI Study Shows Temperature Variation Across City jimp@specsol.spam.sux.com - 2015-11-23 02:18 +0000

#534674 — UHI Study Shows Temperature Variation Across City

UHI Study Shows Temperature Variation Across City
> http://www.reportingclimatescience.com/news-stories/article/uhi-study-shows-temperature-variation-across-city.html

> New urban heat island study shows surprising variation in air
> temperatures across the Twin Cities. Results provide valuable
> insights into efforts to reduce heat-related harm in metro areas
> globally

> Abstract
>
> Data from a dense urban meteorological network (UMN) are analyzed,
> revealing the spatial heterogeneity and temporal variability of the
> Twin Cities (Minneapolis–St. Paul, Minnesota) canopy-layer urban heat
> island (UHI). Data from individual sensors represent surface air
> temperature (SAT) across a variety of local climate zones within a
> 5000-km2 area and span the 3-yr period from 1 August 2011 to 1 August
> 2014. Irregularly spaced data are interpolated to a uniform 1 km × 1
> km grid using two statistical methods: 1) kriging and 2) cokriging
> with impervious surface area data. The cokriged SAT field exhibits
> lower bias and lower RMSE than does the kriged SAT field when
> evaluated against an independent set of observations. Maps, time
> series, and statistics that are based on the cokriged field are
> presented to describe the spatial structure and magnitude of the Twin
> Cities metropolitan area (TCMA) UHI on hourly, daily, and seasonal
> time scales. The average diurnal variation of the TCMA UHI exhibits
> distinct seasonal modulation wherein the daily maximum occurs by
> night during summer and by day during winter. Daily variations in the
> UHI magnitude are linked to changes in weather patterns. Seasonal
> variations in the UHI magnitude are discussed in terms of
> land–atmosphere interactions. To the extent that they more fully
> resolve the spatial structure of the UHI, dense UMNs are advantageous
> relative to limited collections of existing urban meteorological
> observations. Dense UMNs are thus capable of providing valuable
> information for UHI monitoring and for implementing and evaluating
> UHI mitigation efforts.
>
> Citation
>
> Dense Network Observations of the Twin Cities Canopy-Layer Urban Heat
> Island by Brian V. Smoliak, Peter K. Snyder, Tracy E. Twine, Phillip
> M. Mykle, and William F. Hertel published in Journal of Applied
> Meteorology and Climatolology, doi: 10.1175/JAMC-D-14-0239.s1.


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#534686

Sam Wormley <swormley1@gmail.com> wrote:
> UHI Study Shows Temperature Variation Across City
>> http://www.reportingclimatescience.com/news-stories/article/uhi-study-shows-temperature-variation-across-city.html
> 
>> New urban heat island study shows surprising variation in air
>> temperatures across the Twin Cities. Results provide valuable
>> insights into efforts to reduce heat-related harm in metro areas
>> globally
> 
>> Abstract
>>
>> Data from a dense urban meteorological network (UMN) are analyzed,
>> revealing the spatial heterogeneity and temporal variability of the
>> Twin Cities (Minneapolis?St. Paul, Minnesota) canopy-layer urban heat
>> island (UHI). Data from individual sensors represent surface air
>> temperature (SAT) across a variety of local climate zones within a
>> 5000-km2 area and span the 3-yr period from 1 August 2011 to 1 August
>> 2014. Irregularly spaced data are interpolated to a uniform 1 km ? 1
>> km grid using two statistical methods: 1) kriging and 2) cokriging
>> with impervious surface area data. The cokriged SAT field exhibits
>> lower bias and lower RMSE than does the kriged SAT field when
>> evaluated against an independent set of observations. Maps, time
>> series, and statistics that are based on the cokriged field are
>> presented to describe the spatial structure and magnitude of the Twin
>> Cities metropolitan area (TCMA) UHI on hourly, daily, and seasonal
>> time scales. The average diurnal variation of the TCMA UHI exhibits
>> distinct seasonal modulation wherein the daily maximum occurs by
>> night during summer and by day during winter. Daily variations in the
>> UHI magnitude are linked to changes in weather patterns. Seasonal
>> variations in the UHI magnitude are discussed in terms of
>> land?atmosphere interactions. To the extent that they more fully
>> resolve the spatial structure of the UHI, dense UMNs are advantageous
>> relative to limited collections of existing urban meteorological
>> observations. Dense UMNs are thus capable of providing valuable
>> information for UHI monitoring and for implementing and evaluating
>> UHI mitigation efforts.
>>
>> Citation
>>
>> Dense Network Observations of the Twin Cities Canopy-Layer Urban Heat
>> Island by Brian V. Smoliak, Peter K. Snyder, Tracy E. Twine, Phillip
>> M. Mykle, and William F. Hertel published in Journal of Applied
>> Meteorology and Climatolology, doi: 10.1175/JAMC-D-14-0239.s1.
 
Trivially observable by taking a short drive and well know by most
people.

 

-- 
Jim Pennino

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