Energy balance in urban Mexico City: observation and parameterization during the MILAGRO/MCMA-2006 field campaign
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The parameterization of the energy balance from a residential and commercial neighborhood of Mexico City was investigated using direct measurements of radiative and heat fluxes carried out during the MILAGRO/MCMA-2006 field campaign as a reference. The measured fluxes were used to evaluate different models of the energy balance based on parameterizations that require standard meteorological observations: ambient temperature, relative humidity, atmospheric pressure and cloudiness. It was found that these models reproduce with reasonable accuracy the diurnal features of the radiative and heat fluxes. The largest differences between modeled and observed fluxes correspond to the incoming longwave radiation, mainly due to errors in the cloudiness data. This paper contributes to the understanding of the energy partitioning in (sub)tropical urban environments, particularly in the developing world, where energy balance models have not been evaluated.
KeywordsMexico City Outgoing Longwave Radiation Longwave Radiation Urban Surface Urban Canopy
This study was supported by the National Science Foundation (ATM-0528227) and the Metropolitan Environmental Commission of Mexico. E. Velasco acknowledges the postdoctoral funding provided by the Faculty of Arts and Social Sciences of the National University of Singapore for the data analysis. The assistance and logistical support provided by the Atmospheric Monitoring System of the Federal District Government (SIMAT) was fundamental for the satisfactory development of this study. The cloudiness data were provided by J. Fast and J. Barnard from the Pacific Northwest National Laboratory and B. de Foy from Saint Louis University. The K↓ data used in the second evaluation of the modeling approach was provided by E. Alvarez from the National Meteorological Service. The authors acknowledge the comprehensive comments made by two anonymous reviewers that helped to improve substantially the original manuscript.
- Camuffo D, Bernadi A (1982) An observational study of heat fluxes and their relationship with net radiation. Bound Lay Meteor 65:159–179Google Scholar
- Masson V, Grimmond CSB, Oke TR (2002) Evaluation of the town energy balance (TEB) scheme with direct measurements from dry districts in two cities. J Appl Meteorol 41:1011–1026Google Scholar
- Molina LT, Madronich S, Gaffney JS, Apel E, de Foy B, Fast J, Ferrare R, Herndon S, Jimenez JL, Lamb B, Osornio-Vargas AR, Russell P, Schauer JJ, Steve PS, Zavala M (2010) An overview of the MILAGRO 2006 campaign: Mexico City emissions and their transport and transformation. Atmos Chem Phys Discuss 10:7819–7983CrossRefGoogle Scholar
- Oke TR, Zeuner G, Jauregui E (1992) The surface energy balance in Mexico City. Atmos Environ 26B:433–444Google Scholar
- Steward I, Oke TR (2009). Newly developed thermal climate zones for defining and measuring urban heat island magnitude in the canopy layer. Eight Symposium on the Urban Environment. American Meteorological Society, Phoenix, Jan. 10–16Google Scholar
- Tejeda-Martinez A, Jauregui E (2005) Surface energy balance measurements in the Mexico City region: a review. Atmosfera 18(1):1–23Google Scholar