Table 2.

Hg inputs to the Gulf of Maine. All values are for total Hg in kg/year unless noted. Ranges are based on standard deviations of reported Hg concentrations where available or upper and lower bounds for inputs based on different data sources that are described in the main text. n/a = insufficient data available to characterize mass flows. NDI = no direct inputs.

Region	Direct Atmospheric	Rivers	Point Sources	Seawater Inflow
Gulf of Maine: Total Hg	1964 (1708–2049)	385 (94–1289)	586 (8–586)	4178 (2873–5483)
Gulf of Maine: MeHga	17 (5–29)	19 (9–31)	29 (0.4–29)	1022 (635–1410)
Coastal Regions:
Bay of Fundy	147	>122	109	1046
Eastern Coastal Shelf	91	n/a	9	n/a
Northern Coastal Shelf	170	>119	153	n/a
Southern Coastal Shelf	95	n/a	214	n/a
Offshore Regions:
Browns Bank	34	NDI	NDI	n/a
Central Gulf of Maine	679	NDI	NDI	n/a
Georges Bank	482	NDI	NDI	n/a
Great South Channel	60	NDI	NDI	n/a
Georges Channel	47	NDI	NDI	n/a
Jordan Basin	77	NDI	NDI	n/a
Wilkinson Basin	81	NDI	NDI	n/a

^aInsufficient data were available to characterize the magnitude of MeHg exchange for individual physioregions of the Gulf of Maine.