Impacts of a herring gull colony on runoff water quality from an urban green roof.

Green infrastructure (GI) strategies, including green roofs, have become a common, decentralized, nature-based strategy for reducing urban runoff and restoring ecosystem services to the urban environment. In this study, we examined the water quality of incident rainfall and runoff from a green roof installed on top of the Jacob K. Javits Convention Center in New York City. Since the 2014 installation of this green roof, one of the largest in North America, a colony of nesting herring gulls grew to approximately 100 nesting pairs in 2018 and 150 nesting pairs in 2019. Water quality monitoring took place between September 2018 and October 2019. Except for phosphorus on some occasions, we found concentrations of nitrate, nitrite, chlorine, sulfate to be below federal drinking water standards. Levels of the fecal indicator bacteria (FIB), total coliform, E. coli, and Enterococcus, were consistently higher in runoff samples than rainwater, ranging from 150 to over 20,000 CFU/100 mL for E. coli and 100 to over 140,000 CFU/100 mL for total coliform. Quantitative polymerase chain reaction (qPCR) methods were used to search for potential opportunistic pathogens, including Legionella spp., Mycobacterium spp., Campylobacter spp., and Salmonella spp. Discovery of the presence of Catellicoccus marimammalium, a gull-associated marker in runoff water indicates that herring gulls are the likely source of contamination. Due to habitat loss, herring gulls, and other Larus gull species are increasingly nesting on urban roofs, both green (such as at the Javits Center) and conventional (such as on Rikers and Governors Islands). Habitat creation is one of the target ecosystem services desired from GI systems. Although the discharge from the green roof of the Javits Center is directed to the city's sewer system, this study demonstrates the need to treat runoff from green roofs with nesting gull populations if its intended use involves reuse or human contact.

Nature Relatedness Is Positively Associated With Dietary Diversity and Fruit and Vegetable Intake in an Urban Population.

PURPOSE: Feeling connected to nature, or nature relatedness (NR), can positively impact physical and psychological well-being. However, the relationship between NR and dietary behaviors has not been studied. This research examined the relationship between NR and dietary behaviors, including dietary diversity and fruit and vegetable intake. DESIGN: Cross-sectional online survey study. SETTING: Philadelphia, Pennsylvania. SUBJECTS: Adults (n = 317) over 18 years who resided in Philadelphia, PA. MEASURES: The NR Scale was used to measure participants' connection to nature. It includes 21 items across three subscales: self, experience, and perspective (total and subscales range from 1 to 5). Dietary Diversity was assessed using the FAO's standardized tool (scores range from 0 to 9). To calculate dietary diversity, food groups reported were aggregated into nine food categories: starchy staples; dark green leafy vegetables; vitamin A rich fruits/vegetables; other fruits/vegetables; organ meat; meat/fish; eggs; legumes, nuts/seeds; and milk products. The NCI's 2-item CUP Fruit and Vegetable Screener was used to estimate daily fruit and vegetable intake (cups/day), and socio-demographic questions were asked. ANALYSIS: Simple and multivariable regression models were used to examine associations between NR Total and subscale scores with dietary diversity scores and fruit and vegetable intake with NR Total scores and subscale scores. The multivariable models were adjusted for age, race, gender, and income. RESULTS: People with higher NR Total (P < .001), NR Self (P < .001), NR Perspective (P = .002), and NR Experience (P = .002) were more likely to report greater dietary diversity. Those with higher NR Total (P < .001), NR Self (P < .001), and NR Experience (P < .001) reported greater fruit and vegetable intake. Associations remained significant after adjusting for covariates. CONCLUSION: NR was associated with better dietary intake after accounting for socio-demographic indicators. These findings highlight the need for health promotion interventions that enhance NR, such as nature prescription initiatives, urban gardening and greening, and immersion in urban green spaces.

Precipitation and soil moisture data in two engineered urban green infrastructure facilities in New York City.

This paper archives spatiotemporal volumetric moisture content (VMC) and associated precipitation datasets collected between 2012 and 2014 at different depths in two different New York City green infrastructure (GI) (e.g. bioretention) facilities, termed Site 1 and Site 2, respectively. The two sites are similar in both design and monitoring set up, and are located within two kilometers of one another, but differ in terms of hydraulic loading ratio (HLR). Both sites were designed and instrumented specifically to facilitate a comparison of the hydrologic fluxes within the two GI facilities. Site 1 receives only direct rainfall and is hydrologically isolated from the surrounding impervious surfaces (HLR = 1); Site 2 receives both direct precipitation and street runoff through a curb cut inlet (HLR = 3.8). Monitoring was conducted both inside (L plots) and outside (G plots) weighing lysimeters that were installed at both sites and planted with similar vegetation. Each L and G plot was equipped with five soil moisture sensors installed at 5, 10, 20, 30, and 50 cm depths in a circular pattern. This dataset is associated with the original research presented in "Observed Variability in Soil Moisture in Engineered Urban Green Infrastructure Systems and Linkages to Ecosystem Services [1]."

A comparative analysis of micrometeorological determinants of evapotranspiration rates within a heterogeneous urban environment.

Variability in micrometeorological conditions and their influence on estimated reference evapotranspiration (RET) rates were evaluated across a heterogeneous urban environment. Micrometeorological data sets (incoming solar radiation, air temperature, relative humidity and wind speed) were collected over a one-year period at six weather stations in New York City, NY (USA). Weather stations are located at four new urban green space monitoring sites and two airports. Reference evapotranspiration (RET) rates were estimated from the micrometeorological data sets for a short reference surface at a daily time-step using the ASCE Standardized Reference Evapotranspiration Equation, a Penman-Monteith based combination equation. Non-parametric comparative statistical analyses (Kruskal-Wallis) revealed statistically significant differences (at significance level α = 0.05) in micrometeorological conditions and estimated RET rates between the six sites. On a cumulative annual basis, estimated RET varied by up to 40 percent between the sites. A new technique for adjusting weather data collected at one location (e.g. regional airports) for use at another location (e.g. interior engineered urban green spaces) was evaluated. The study highlights the importance, for accurate estimation of ET, of onsite micrometeorological data sets, but concludes that additional research is needed to more thoroughly characterize micrometeorological variability across heterogeneous urban environments, and also to evaluate the influence of non-meteorological determinants, e.g. vegetation type, soil/media type, media moisture conditions and anthropogenic heat fluxes, on urban ET.

Life cycle implications of urban green infrastructure.

Low Impact Development (LID) is part of a new paradigm in urban water management that aims to decentralize water storage and movement functions within urban watersheds. LID strategies can restore ecosystem functions and reduce runoff loadings to municipal water pollution control facilities (WPCF). This research examines the avoided energy and greenhouse gas (GHG) emissions of select LID strategies using life cycle assessment (LCA) and a stochastic urban watershed model. We estimate annual energy savings and avoided GHG emissions of 7.3 GJ and 0.4 metric tons, respectively, for a LID strategy implemented in a neighborhood in New York City. Annual savings are small compared to the energy and GHG intensity of the LID materials, resulting in slow environmental payback times. This preliminary analysis suggests that if implemented throughout an urban watershed, LID strategies may have important energy cost savings to WPCF, and can make progress towards reducing their carbon footprint.