Narragansett Bay Areal Extent of Hypoxia in 2009 October 8, 2009 NOAA CHRP Managers Meeting...
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Narragansett Bay Areal Extent of Hypoxia in 2009
October 8, 2009
NOAA CHRP Managers MeetingChristopher Deacutis
Narragansett Bay Estuary Program
URI Coastal, Institute
& Warren Prell & David Murray
Brown Univ.
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Minimum D.O.
June 18 ; July15 ; July23
End neap neap strong spring tide
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Bottom D.O.
June 18 ; July15 ; July23
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Minimum D.O.
Aug 4 ; Aug13 ; Sept. 1
Weak Spring Neap End Neap tide
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Bottom D.O.
Aug 4 ; Aug13 ; Sept. 1
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Surface D.O.
June 18 ; July15 ; July23
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Surface D.O.
Aug 4 ; Aug13 ; Sept. 1
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% o
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Suboxic (<=4.8 mg/L) Hypoxic (<= 2.9 mg/L) Severely Hypoxic (<=1.2 mg/L)
1999 2000 2001 2002 2003 2005 2006 2007 2008 20092004
Narragansett Bay Summer Dissolved Oxygen Spatial Surveys- Botttom DO
• % of Survey Area at various hypoxic levels since 1999 (Total area surveyed ~ 150 km2)
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Year
1938
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1998 2003
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1938
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• Sulfidic waters Greenwich Cove August 18 2009
Fish kill Chepiwanopxet Greenwich Bay August 1,2009
Juv. Winter Flounder
8-1-09
Piscivore Feast
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• Good News ! - Ruppia (Widgeon Grass)At Cedar Tree Pt.
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Video Break
• Film clips Greenwich BayAugust 14, 2009