Spatial and temporal characterization of cyanobacteria blooms in the Mississippi Sound and their relationship to the Bonnet Carré Spillway openings

Inia M Soto Ramos; Benjamin Crooke; Bridget Seegers; Ivona Cetinić; Mustafa Kemal Cambazoglu; Brandy Armstrong

doi:10.1016/j.hal.2023.102472

Spatial and temporal characterization of cyanobacteria blooms in the Mississippi Sound and their relationship to the Bonnet Carré Spillway openings

Harmful Algae. 2023 Aug:127:102472. doi: 10.1016/j.hal.2023.102472. Epub 2023 Jun 13.

Authors

Inia M Soto Ramos¹, Benjamin Crooke², Bridget Seegers³, Ivona Cetinić³, Mustafa Kemal Cambazoglu⁴, Brandy Armstrong⁴

Affiliations

¹ GESTAR II, Morgan State University, Baltimore, MD, USA; Ocean Ecology Laboratory, NASA/Goddard Space Flight Center, Greenbelt, MD, USA. Electronic address: inia.m.sotoramos@nasa.gov.
² Skidmore College, NASA Goddard Space Flight Center Office of STEM Engagement (OSTEM) Internship Program, Greenbelt, MD, USA.
³ GESTAR II, Morgan State University, Baltimore, MD, USA; Ocean Ecology Laboratory, NASA/Goddard Space Flight Center, Greenbelt, MD, USA.
⁴ The University of Southern Mississippi, Long Beach, MS, USA.

PMID: 37544672
DOI: 10.1016/j.hal.2023.102472

Abstract

During the spring and summer of 2019, an unprecedented cyanobacterial harmful algal bloom (cyanoHAB) was responsible for beach advisories on 25 beaches along the Mississippi Sound for over 3 months. Due to the preceding heavy rainfall and flooding within the Mississippi River watershed, for the first time in history, the Bonnet Carré Spillway (BCS) opened twice in one year during 2019. The coastal cyanoHAB coincided with the second BCS opening. The main objectives of this study were: (1) to investigate the potential for using the National Aeronautics and Space Administration (NASA) ocean color standard Cyanobacteria Index (CI_cyano) algorithm to characterize the spatial and temporal extent of the 2019 cyanoHAB; (2) to couple the CI_cyano data with river discharge, salinity, and modeled-wind data to study the conditions leading to the cyanoHAB and factors aiding the advection and persistence of the bloom within the Mississippi Sound, including a possible relationship to the BCS; (3) to further investigate the relationship with the BCS by repeating the methods using data from 2018, which was a year when the BCS was opened but no evidence of cyanoHABs was reported along the Mississippi coast. Weekly means and monthly frequency CI_cyano images, river discharge, salinity, and modeled-wind data from February to September of 2018 and 2019 were analyzed, which coincide with three BCS openings. In March 2018, a cyanobacteria bloom was observed within Lake Pontchartrain coinciding with the BCS opening; however, the month-long bloom was contained to the lake. Two distinct cyanoHABs were observed in 2019 and both blooms were advected into the Mississippi Sound, and likely contributed to the 3-month-long beach water advisories of 2019 along the Mississippi coastline. From March to mid-July 2019, salinity at stations within the Mississippi Sound was consistently near zero indicating high levels of freshwater. During that time, winds were predominantly northwestward, preventing the BCS waters from flushing into the Mississippi Shelf and resulting in BCS waters remaining longer within the estuarine lakes and Mississippi Sound. Although the BCS had an undeniable impact on the presence of the coastal cyanoHAB of 2019, other variables including wind direction, water flow, mixing, and persistence of freshwater within the Sound can determine the intensity and extent of the cyanoHABs. Coupling in situ phytoplankton information from freshwater water bodies to the marine continuum along with water flow, wind data, and satellite imagery could help identify cyanoHABs at early stages and forecast their trajectory and potential impacts on coastal areas.

Keywords: Bonnet Carré Spillway; Cyanobacteria blooms; Harmful algal blooms (HABs); Mississippi Sound; Ocean color; River diversions.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

Cyanobacteria*
Harmful Algal Bloom
Lakes
Phytoplankton
Water

Substances

Water