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 ... Read More
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 ... Read More
Dr. Nancy Rabalais (at left) and crew, aboard R/V Pelican, prepare to deploy a conductivity, temperature, and depth (CTD) carousel (rosette) containing an array of Niskin water sampling bottles. The ... Read More
NOAA’s National Centers for Coastal Ocean Science (NCCOS) is pleased to announce support for 28 new and continuing harmful algal bloom (HAB) research awards in 2018. These awards, totaling $6.8M, ... Read More
Ecological studies show that bottom-up (e.g., nutrient input) and top-down (e.g., grazing/predation) pressuresmay change the structure of aquatic ecosystems with 'cascading' effectsthroughoutthe food chain. Recent research supportsthat zooplankton grazing in ... Read More
Twenty-five years of NCCOS sponsored research shows that the offshore summer hypoxic (low-oxygen) 'dead zone' in the Gulf of Mexico is strongly linked to nutrient loading from the Mississippi River ... Read More
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 ... Read More
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 ... Read More
A three-dimensional coupled hydrodynamic-sediment transport model for the TexasLouisiana 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 ... Read More
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 ... Read More
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 ... Read More
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 ... Read More
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 ... Read More
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 ... Read More
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 ... Read More
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 ... Read More
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NCCOS delivers ecosystem science solutions for stewardship of the nation’s ocean and coastal resources, in direct support of NOS priorities, offices, and customers, and to sustain thriving coastal communities and economies.