OVERVIEW OF SUMMER DISSOLVED OXYGEN amp CHLOROPHYLL IN NARRAGANSETT BAY CHRP Meeting MAY 19 2015 Heather Stoffel of Time Hypoxic Events Occur During Each Summer Month Stations Providence River amp Upper Bay ID: 762073
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OVERVIEW OF SUMMER DISSOLVED OXYGEN & CHLOROPHYLL IN NARRAGANSETT BAY CHRP Meeting MAY 19, 2015 Heather Stoffel
% of Time Hypoxic Events Occur During Each Summer Month Stations: Providence River & Upper Bay Greenwich BayWest PassageEast PassageMonthPDBRCPNPGBSRMVQPPPMHMay00001.00.70000Jun6.3 18.0 6.622.820.421.83.11.314.07.5July/Aug69.8 63.0 87.769.465.165.694.898.783.477.5Sept19.0 19.0 5.67.89.111.62.102.615.0Oct4.7 0004.40.30000 NO hypoxic event have been observed in May until 2012 (May 21-25, 2012) GB & SR October events occurred 8 of the 10 years of data at PD (latest 10/15/06 PD) Hypoxic events occur when bottom waters are >14C
Data from 8 monitored rivers that discharge into Narragansett Bay (HR, BR,PR, TMR, WR, MR, TR, WR)Normalized to the 15 year seasonal total average
Conclusions 2015 was a “good year” (drier than average).NP and MV appears to be showing a downward trend in oxygen exceedences, but more data is need to test for significance.MH needs further examination. It is possible hypoxia is increasing in this area.