explains more than 50 percent of the variability in gas-phase EPCB concentrations at these sites. In addition, the PCB congener profiles are very similar amongst sampling sites and also with the dissolved phase PCB profile from the water of the New York/New Jersey Harbor Estuary (Brunciak et al., 2001b; Totten et al., 2001). This suggests that PCBs are volatilized into the atmosphere from the water and land surfaces in and near the urban area during periods of higher temperature and deposited during periods of low temperatures.

Table 27.1 presents a summary of the dry particle deposition, wet deposition (VanRy et al., 2002) and gas absorption of EPCBs, selected PCB congeners and PCB homologues on an annual basis at the Liberty Science Center, Sandy Hook, and New Brunswick (|g m-2 yr-1). The gaseous PCB concentrations at New Brunswick were included in the calculation of gas absorption into the New York/New Jersey Harbor Estuary even though the site is physically removed from the estuary. The PCB gas absorptive fluxes at New Brunswick will be an underestimate based on lower observed wind speeds.

These are the first comprehensive estimates of PCB deposition to the New York/New Jersey Harbor Estuary and the Lower Hudson River Estuary. Table 27.2 compares the atmospheric EPCB fluxes on an annual basis for wet and dry particle deposition, and gas absorption to values published for the Great Lakes from IADN (Hoff et al., 1996;Hillery et al., 1998) and Chesapeake Bay from CBADS (Baker et al., 1997). Atmospheric fluxes to the estuary due to precipitation and dry particle deposition are perhaps two to ten times fluxes reported for the other systems. If gas absorptive inputs are included,

Table 27.2. Comparison of Atmospheric Fluxes of £PCBs(|igm 2yr-aquatic ecosystems

_1) to various

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Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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