No long-term observations of CO_2 fluxes have been conducted in urban environments despite the fact that cities are major sources of CO_2 and sites where a large and ever increasing fraction of the world's population live (Grimmond et al. 2002). This paper presents details of research initiated in a residential neighborhood, Cub Hill, of Baltimore, MD, USA to continuously measure urban CO_2, heat, water and momentum fluxes. Details of the site, which is part of the Baltimore LTER project, and instrumentation are presented, along with a brief summary of the data collected to date.
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