Abstract
Research into the health impacts of heat has proliferated since 2000. Temperature increases could exacerbate the increased heat already experienced by urban populations due to urbanization. Heat-related mortality studies have found that hot southern cities in North America have not experienced the summer increases in mortality found in their more northern counterparts. Heat-related morbidity studies have not assessed this possible regional difference. This comparison study uses data from emergency 911 dispatches [referred to as heat-related dispatches (HRD)] identified by responders as heat-related for two United States cities located in different regions with very different climates: Chicago, Illinois in the upper midwest and Phoenix, Arizona in the southwest. Phoenix’s climate is hot and arid. Chicago’s climate is more temperate, but can also experience days with unusually high temperatures combined with high humidity. This study examines the relationships between rising HRD and daily temperatures: maximum (Tmax); apparent (ATmax): minimum (Tmin) and two energy balance indices (PET and UTCI). Phoenix had more HRD cumulatively, over a longer warm weather season, but did not experience the large spikes in HRD that occurred in Chicago, even though it was routinely subjected to much hotter weather conditions. Statistical analyses showed the strongest relationships to daily ATmax for both cities. Phoenix’s lack of HRD spikes, similar to the summer mortality patterns for southern cities, suggests an avenue for future research to better understand the dynamics of possible physiological or behavioral adaption that seems to reduce residents’ vulnerability to heat.
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References
Anderson GB, Bell ML (2011) Heat Waves in the United States: mortality risk during heat waves and effect modification by Heat Wave characteristics in 43 US Communities. Environ Health Perspect 119(2):210–218
Bassil KL, Cole DC, Moineddin R, Craig AM, Lou WYW, Schwartz B, Rea E (2009) Temporal and spatial variation of heat-related illness using 911 medical dispatch data. Environ Res 109:600–606
Blunden J, Arndt DS, Baringer MO (2011) State of the Climate in 2010. Bull Am Meteorol Soc 92(6):S1–S266
Brazel A, Selover N, Vose R, Heisler G (2000) The tale of two climates—Baltimore and Phoenix urban LTER sites. Clim Res 15(2):123–135
Curriero FC, Heiner KS, Samet JM, Zeger SL, Strug L, Patz JA (2002) Temperature and mortality in 11 cities of the eastern United States. Am J Epidemiol 155(1):80–87
Dolney TJ, Sheridan SC (2006) The relationship between extreme heat and ambulance response calls for the city of Toronto, Ontario, Canada. Environ Res 101(1):94–103
Ebi KL (2007) Towards an early warning system for heat events. J Risk Res 10(5):729–744
Ebi K, Teisberg T, Kalkstein L, Robinson L, Weiher R (2003) Heat watch/warning systems save lives: estimated costs and benefits for Philadelphia 1995–1998: Isee-165. Epidemiology 14(5):S35
Golden JS, Hartz D, Brazel A, Luber G, Phelan P (2008) A biometeorology study of climate and heat-related morbidity in Phoenix from 2001 to 2006. Int J Biometeorol 52(6):471–480
Hartz D, Brazel A, Heisler G (2006) A case study in resort climatology of Phoenix, Arizona, USA. Int J Biometeorol 51:73–83
Hartz D, Golden J, Sister C, Chuang W-C, Brazel A (2012) Climate and heat-related emergencies in Chicago, Illinois (2003–2006). Int J Biometeorol 56:71–83
Kalkstein LS, Davis RE (1989) Weather and human mortality—an evaluation of demographic and interregional responses in the United-States. Ann Assoc Am Geogr 79(1):44–64
Kalkstein A, Sheridan S (2007) The social impacts of the heat-health watch/warning system in Phoenix, Arizona: assessing the perceived risk and response of the public. Int J Biometeorol 52(1):43–55
Kalkstein LS, Valimont KM (1986) An evaluation of summer discomfort in the united-states using a relative Climatological Index. Bull Am Meteorol Soc 67(7):842–848
Kalkstein LS, Sheridan SC, Kalkstein AJ (2009) Heat/health warning systems: development, implementation, and intervention activities. In: McGregor GR (ed) Biometeorology for adaptation to climate variability and change, vol 1. Biometeorology. Springer, Netherlands, pp 33–48
Knowlton K, Rotkin-Ellman M, King G, Margolis HG, Smith D, Solomon G, Trent R, Paul E (2009) The 2006 California Heat Wave: impacts on hospitalizations and emergency department visits. Environ Health Perspect 117(1):61–67
Kovats RS, Ebi KL (2006) Heatwaves and public health in Europe. Eur J Public Health 16(6):592
Kovats RS, Hajat S (2008) Heat stress and public health: a critical review. Annu Rev Public Health 29:41–55
Luber G, McGeehin M (2008) Climate change and extreme heat events. Am J Prev Med 35(5):429–435
Matzarakis A, Rutz F, Mayer H (2007) Modelling radiation fluxes in simple and complex environments—application of the RayMan model. Int J Biometeorol 51(4):323–334
Medina-Ramon M, Schwartz J (2007) Temperature, temperature extremes, and mortality: a study of acclimatisation and effect modification in 50 US cities. Occup Environ Med 64(12):827–833
NOAA (2011a) US Climate Normals 1981–2010. National Oceanic and Atmospheric Association. Available at: http://www.ncdc.noaa.gov/oa/climate/normals/usnormalsprods.html. Accessed May 2012
NOAA (2011b) Summer 2011 Recap: Across the U.S., Heat Broke Records. National Oceanic and Atmospheric Association . http://www.climatewatch.noaa.gov/image/2011/summer-2011-recap-across-the-u-s-heat-broke-records. Accessed 8 November 2011
Novikov I, Kalter-Leibovici O et al (2012) Weather conditions and visits to the medical wing of emergency rooms in a metropolitan area during the warm season in Israel: a predictive model. Int J Biometeorol 56(1):121–127
Parry ML, Canziani OF, Palutikof JP, van der Linden PJ, Hanson CE (2007) Inter-relationships between adaptation and mitigation. In: Parry ML, Canziani OF, Palutikof JP, van der Linden PJ, Hanson CE (eds) Climate change 2007: Impacts, adaptation and vulnerability. Contribution of Working Group II to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge
Sheridan S (2007) A survey of public perception and response to heat warnings across four North American cities: an evaluation of municipal effectiveness. Int J Biometeorol 52(1):3–15
Sheridan SC, Kalkstein LS (2004) Progress in heat watch-warning system technology. Bull Am Meteorol Soc 85(12):1931–1941
Sheridan S, Kalkstein A (2010) Seasonal variability in heat-related mortality across the United States. Nat Hazard 55(2):291–305
Sheridan S, Kalkstein A, Kalkstein L (2009) Trends in heat-related mortality in the United States, 1975–2004. Nat Hazard 50(1):145–160
Spatial Synoptic Classification (2011) http://sheridan.geog.kent.edu/ssc.html. Accessed 11 August 2011
Steadman RG (1979) Assessment of Sultriness.1. Temperature-humidity index based on human physiology and clothing science. J Appl Meteorol 18(7):861–873
United States Census Bureau (2009) Quick facts: Chicago. Available at http://egov.cityofchicago.org/webportal/COCWebPortal/COC_EDITORIAL/Demographics0607.pdf. Accessed May 2010
United States Census Bureau (2010) American fact finder: Maricopa County Arizona. Available at: http://factfinder.census.gov/home/saff/main.html. Accessed July 2011
United States Census Bureau (2012) American housing survey. Available at: http://www.census.gov/housing/ahs/data/metro.html. Accessed June 2012
US CDC (2011) Faststats—Body measurements. United States Centers for Disease and Control and Prevention. http://www.cdc.gov/nchs/fastats/bodymeas.htm. Accessed July 2011
US EPA (2008) Urban Heat Island Pilot Project (UHIPP). United States Environmental Protection Agency. Available at: http://www.epa.gov/hiri/pilot/index.htm. Accessed 21 September 2011
Weisskopf MG, Anderson HA, Foldy S, Hanrahan LP, Blair K, Torok TJ, Rumm PD (2002) Heat wave morbidity and mortality, Milwaukee, Wis, 1999 vs 1995: an improved response? Am J Public Health 92(5):830–833. doi:10.2105/ajph.92.5.830
WHO (2003) McMichael AJ, Campbell-Lendrum DH, Corvalán CF et al (eds) Climate change and human health: risks and responses World Health Organization, Geneva
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We would like to thank Nancy Selover, Arizona State Climatologist for climate data, the Phoenix Fire Department and City of Chicago Department of Environment for their technical assistance.
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Hartz, D.A., Brazel, A.J. & Golden, J.S. A comparative climate analysis of heat-related emergency 911 dispatches: Chicago, Illinois and Phoenix, Arizona USA 2003 to 2006. Int J Biometeorol 57, 669–678 (2013). https://doi.org/10.1007/s00484-012-0593-z
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DOI: https://doi.org/10.1007/s00484-012-0593-z