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Projects

Biological Vulnerability to Hypoxia from Climate W...

This project will provide critical information and predictive tools to coastal managers for understanding how species will respond to changing hypoxia conditions from ongoing and projected warming in the Gulf ...

Integrated Ecosystem Modeling of the Causes of Hyp...

The largest low oxygen (hypoxic) zone affecting the United States is in the northern Gulf of Mexico, adjacent to the Mississippi River. This “dead zone” in the Gulf of Mexico ...

Mechanisms Controlling Hypoxia – Integrated Causal...

We’re examining the complex physical and biogeochemical relations that control and maintain the low-oxygen dead zone in the northern Gulf of Mexico (nGOM). We are combining field data from moored ...

Operational Gulf of Mexico Hypoxia Monitoring

The Gulf of Mexico hypoxia monitoring cruise is an annual shelf-wide survey of the Gulf's hypoxic area (i.e., “dead zone”) and the survey is the metric used by the interagency ...

Predicting Impacts of Climate Change on Success of...

We are investigating how rising atmospheric temperature and changing precipitation patterns will affect coastal hypoxia (low dissolved oxygen) in Chesapeake Bay. Hypoxia in the bay, caused by an excessive influx ...

Transitioning to Operations NOAA Supported Statist...

The Harmful Algal Bloom and Hypoxia Research and Control Act (HABHRCA) mandates the development of scientific tools for natural resource managers to address hypoxia in coastal ecosystems. In response, NCCOS ...

News

Gulf of Mexico Hypoxia Task Force Convenes Annual ...

The Mississippi River Gulf of Mexico Watershed Nutrient Task Force, otherwise known as the Hypoxia Task Force (HTF), held its 38th annual meeting which highlighted ongoing efforts by HTF members to improve ...

Below Average Summer 2023 ‘Dead Zone’ Measured in ...

NCCOS-supported scientists have determined that this year’s Gulf of Mexico “dead zone” — an area of low oxygen that can kill fish and marine life — is approximately 3,058 square ...

NOAA Forecasts Smaller than Average ‘Dead Zone’ fo...

The Mississippi River watershed, which encompasses over 40% of the continental U.S and crosses 22 state boundaries, is made up of farms (yellow), cities (red), and natural lands (green). Nitrogen ...

New Funding to Reduce Nutrient Pollution Reviewed ...

The Gulf of Mexico Hypoxia Task Force held its 37th annual meeting in December to review ongoing actions to improve water quality in the Mississippi River basin and to discuss ...

Smaller than Expected Summer 2022 ‘Dead Zone’ Meas...

(Top) Map of measured Gulf hypoxia zone, July 25 – August 1, 2022. Red area denotes 2 mg/L of oxygen or lower, the level which is considered hypoxic, at the ...

Third Gulf of Mexico Hypoxia Task Force Report to ...

The Gulf of Mexico is home to the largest annual hypoxic zone in the United States, an area of low oxygen which puts at risk valuable commercial and recreational fisheries ...

NOAA Forecasts An Average ‘Dead Zone’ for Gulf of ...

NCCOS scientists are forecasting this summer’s Gulf of Mexico hypoxic zone or “dead zone”—an area of low to no oxygen that can kill fish and other marine life— to be ...

Modeling Shows Nitrogen Reductions Have Decreased ...

Management actions since the mid-1980s have reduced nutrient inputs to Chesapeake Bay, resulting in a smaller, annual “dead zone” — an area in the bay that lacks the oxygen needed ...

Gulf of Mexico Dead Zone Task Force Convenes to Di...

The Mississippi River Gulf of Mexico Watershed Nutrient Task Force, otherwise known as the Hypoxia Task Force (HTF), held a virtual fall meeting from December 13- 14, 2021. The Task ...

Phytoplankton on Louisiana Shelf Show Seasonal Com...

NCCOS sponsored researchers analyzed common phytoplankton taxa and accompanying environmental data for 672 surface water samples collected from 95 stations located on the Louisiana/Texas shelf (Gulf of Mexico) between 1990 ...
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Data & Publications

A coupled physical-biological model of the Northern Gulf of Mexico shelf: model description, validation and analysis of phytoplankton variability

The Texas-Louisiana shelf in the Northern Gulf of Mexico receives large inputs of nutrients and freshwater from the Mississippi/Atchafalaya River system. The nutrients stimulate high rates of primary production in the river plume, which contributes to the development of a ...

A modeling study of physical controls on hypoxia generation in the northern Gulf of Mexico

The Louisiana shelf (LA shelf) in the northern Gulf of Mexico experiences hypoxic conditions every summer due to the combination of eutrophication and strong water column stratification. Here we use a three-dimensional circulation model coupled with a simple oxygen model ...

Dispersal of Mississippi and Atchafalaya Sediment on the Texas-Louisiana Shelf: Model Estimates for the Year 1993

A three-dimensional coupled hydrodynamic-sediment transport model for the Texas–Louisiana continental shelf was developed using the Regional Ocean Modeling System (ROMS) and used to represent fluvial sediment transport and deposition for the year 1993. The model included water and sediment discharge ...

Effects of model physics on hypoxia simulations for the northern Gulf of Mexico: A model intercomparison

A large hypoxic zone forms every summer on the Texas-Louisiana Shelf in the northern Gulf of Mexico due to nutrient and freshwater inputs from the Mississippi/Atchafalaya River System. Efforts are underway to reduce the extent of hypoxic conditions through reductions ...

Ensemble modeling informs hypoxia management in the northern Gulf of Mexico

A large region of low-dissolved-oxygen bottom waters (hypoxia) forms nearly every summer in the northern Gulf of Mexico because of nutrient inputs from the Mississippi River Basin and water column stratification. Policymakers developed goals to reduce the area of hypoxic ...

Establishing National Ocean Service Priorities for Estuarine, Coastal, and Ocean Modeling: Capabilities, Gaps, and Preliminary Prioritization Factors

The National Oceanic and Atmospheric Administration (NOAA) and National Ocean Service (NOS) Strategic Plans present a vision for protecting, restoring, and managing our nation's aquatic resources through proactive ecosystem approaches to management. These approaches require integrated, multidisciplinary models and coordination ...

Historical trends of hypoxia in Changjiang River estuary: Applications of chemical biomarkers and microfossils

Over the past two decades China has become the largest global consumer of fertilizers, which has enhanced river nutrient fluxes and caused eutrophication and hypoxia in the Yangtze (Changjiang) large river delta-front estuary (LDE). In this study, we utilized plant ...

Interannual Variation in Stratification over the Texas–Louisiana Continental Shelf and Effects on Seasonal Hypoxia

A numerical dye is used to track freshwater released in May and June from the Mississippi and Atchafalaya rivers using a hydrodynamic model. These months are chosen because discharge and nutrient load in May and June is significantly correlated with ...

Linking molecular microbial ecology to geochemistry in a coastal hypoxic zone

Multiple environmental mechanisms have been proposed to control bottom water hypoxia (<2 mg O2 L?1) in the northern Gulf of Mexico Louisiana shelf. Near-bottom hypoxia has been attributed to a direct consumption of oxygen through benthic microbial respiration and a ...

Modeling Coastal Hypoxia: Numerical Simulations of Patterns, Controls and Effects of Dissolved Oxygen Dynamics

This book provides a snapshot of representative modeling analyses of coastal hypoxia and its effects. Hypoxia refers to conditions in the water column where dissolved oxygen falls below levels that can support most metazoan marine life (i.e., 2 mg O2 ...

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