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Phytoplankton Dynamics and Bottom Water OxygenDuring a Large Bloom in the Summer of 2011

Oscar Schofield, Scott Glenn, Josh Kohut, John Manderson, Grace Saba, Matt Oliver

TAKE HOME MESSAGE:IOOS WILL IMPROVE

WATER QUALITYSAMPLING &

MANAGEMENT

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Causes? Anthropogenic loading from urbanized coastline?

Ocean

Hudson Bay

Salinity

P e r c e n

t O x y g e n

S a

t u r a

t i o n

undersaturated

superstaurated

LATTE April 2005

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40N

74W75W

39N

TemperatureoC

19 20 21 22 24

July 6, 98 - AVHRR

FieldStation

LEO

40N

74W75W

39N

FieldStation

Chlor-a (mg/m3

).1 .3 .5 1 2 4

July 11, 98 - SeaWiFS

LEO

New Jersey Coastal Upwelling

RecurrentHypoxia/Anoxia

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SST

CHL

CHL

1996-2001Local scale observatories

2001-2006Regional scale observatories

2006-2012-2006Regional scale observatories

The inability of the static sampling lead to the desire of creatingan observatory network which is capable of resolving spatial and temporal

dynamics in the Mid-Atlantic

Upwelling hypoxia &coastal predictive skill

Schofield et al. 2002Glenn & Schofield et al 2003

Glenn & Schofield et al 2009 Schofield et al 2011

Shelf transport &communication with deep sea

Ecosystemdynamics

climate scalemediated change

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U..

CapeCod

CapeHatteras

NJ

MACT

VA

DE

NY

NC

RI

MD

PA10 States

MIDDLE ATLANTIC REGIONAL ASSOCIATION COASTAL OCEAN OBSERVING S YSTEM

1000 kmCape to Cape

Gliders Nowcast &Forecasts

L-Band X-BandCODAR

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The Event(August 23 2011)

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The Evolution of the Event

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upwelling

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The 2011 bloom was almost 10X standard monthly chlorophyll concentration

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The Cause?

River inputs?Upwelling?

Advection?

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Year Day

R i v e r

O u

t p u

t

Large Bloom Observed

Variable Upwelling

Hurricane Irene and aftermath

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HurricanceIrene

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U.S. IOOS interactive observatory network allows adaptive sampling ofthe water quality.

Upwelling drove a large bloom and over time was associated withdeclines in bottom water oxygen.

The passage of Hurricane Irene did not terminate the bloom, but didincrease the bottom water oxygen.

U.S. IOOS could help provide improved water quality monitoring now.

Water Quality - U.S. IOOS as it is designed A multi-agency activity.Make Observations > Advance the Science > Improve the Forecasts

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