Nan Walker

James P. Morgan Distinguished Professor Louisiana State University

  • Baton Rouge LA

Dr. Walker has more than 30 years of experience in satellite remote sensing of coastal and oceanic processes.

Contact

Louisiana State University

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Biography

Dr. Nan Walker has more than 30 years of experience in satellite remote sensing of coastal and oceanic processes. She has been employed as a faculty member at LSU in the Coastal Studies Institute and the Department of Oceanography and Coastal Sciences for more than 30 years, where she teaches graduate and undergraduate courses, advises M.S. and Ph.D. graduate students in their research, and has directed the ESL since 2003. She specializes in using satellite data to advance the understanding of physical processes and air-sea interactions, and has conducted research in the Gulf of Mexico, Florida Keys/Bahama Bank region, the southern African region and the Caribbean Sea. Her research interests include Loop Current eddy circulation, air-sea interactions related to hurricanes and winter storms, estuarine-shelf exchange processes, surface sediment transport, coastal upwelling, and ocean climatology. She has experience in the application of visible, thermal, and microwave (SAR) satellite measurements. In recent years, she has focused on understanding Loop Current frontal eddy cyclone impacts on circulation and on ocean-atmosphere interactions that impact hurricane intensity changes. She has a B.S. in Marine Zoology (Duke University), an M.S. in Marine Sciences (Louisiana State University), and a Ph.D. in Physical Oceanography (University of Cape Town, South Africa). She spent a 2-year “sabbatical” with her husband starting in 1989 (after her Ph.D.), sailing their 32-foot sailboat from Cape Town to the Gulf of Mexico, with a 6-month research experience in the West Indies Marine Lab, U.S. Virgin Islands, studying Hurricane Hugo’s impacts on the corals of St Croix. Her hobbies include scuba diving, photography, hiking, bicycling, and gardening.

Areas of Expertise

Gulf of Mexico Loop Current and Eddy Circulations
Estuarine-shelf Exchange Processes
Physical Oceanography‎
Satellite Oceanography
Physical-Biological Interactions
Air-sea Interactions and Tropical Cyclone Intensity
Physical Processes affecting Coral Reef Health

Research Focus

Satellite Remote Sensing & Ocean-Atmosphere Interactions

Dr. Walker’s research centers on satellite remote sensing of Gulf Coast ocean dynamics, from Loop Current eddies to hurricane–ocean interactions. She fuses real-time multisensor imagery, field data, and circulation models at LSU’s Earth Scan Laboratory to sharpen hurricane intensity forecasts, track oil spills, and guide coastal management.

Education

University of Cape Town

Ph.D.

1989

Louisiana State University

M.S.

1982

Duke University

B.S.

1976

Media Appearances

Cat 4 Hurricane Helene intensified over the Gulf Loop Current. Here's why it's so dangerous.

NOLA  online

2024-09-26

The high heat content of the waters within the current provide a major fuel for hurricanes, which grow stronger over warmer waters, Nan Walker, a professor at LSU's Department of Oceanography and Coastal Sciences, explained.

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What's the 'Loop Current' and how does it impact hurricanes? LSU professor answers our questions

WWNO  online

2022-06-07

WWNO talks with Nan Walker, LSU professor of Oceanography and Coastal Sciences and director of the Earth Scan Laboratory about the Loop Current.

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Episode 19 - LSU Professor of Oceanography Dr. Nan Walker

FOX 8 - The David Bernard Podcast  

2021-10-13

The Gulf of Mexico can be a complicated body of water. We know the water is hot but there are various currents and eddies that are sometimes cold. All of these can have big impacts on hurricanes both good and bad. Dr. Nan Walker is a James P. Morgan Distinguished Professor of Coastal Studies in the Department of Oceanography & Coastal Sciences at Louisiana State University. She is also Director of LSU’S Earth Scan Laboratory. Her areas of expertise include physical oceanography, satellite oceanography, air-sea interactions and tropical cyclone intensities, the Gulf of Mexico Loop Current and eddy circulations.

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Articles

Impacts of a major Mississippi River freshwater diversion on suspended sediment plume kinematics in lake Pontchartrain, a semi-enclosed Gulf of Mexico Estuary

Estuaries and Coasts

2021

MODIS satellite imagery and in situ water measurements were used to quantify inorganic sediment concentration (ISC) and, subsequently, sediment plume motion and evolution during the 2016 diversion of the Mississippi River through the Bonnet Carré Spillway (BCS) within Lake Pontchartrain (LP) estuary in Louisiana, USA. Satellite images revealed that sediment plume areal distribution was closely linked to BCS discharge rate. The plume flowed eastward along the southern LP coastline at an average speed of ~ 0.3 m s−1 during the first week of the event and attained its maximum areal extent (~ 1117 km2; 68% of the total LP area) on 23 January.

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