Article
Engineering, Environmental
Matthew Ross Jones, Bradley M. Tebo
Summary: Mixing waters of different ionic strengths facilitates the geochemical cycling of reactive elements, with the most reactive zone being where the gradient in ionic strength is steepest. The redox-active metal manganese cycles between different oxidation states in oxygenated systems, influencing the mobility of inorganic and organic chemicals. Estuaries serve as accessible environmental systems where waters of different ionic strengths mix, providing insights into the dynamic geochemical environment and manganese cycle propagation.
Article
Engineering, Marine
Bo Bae Yoon, Yun-Hwan Jung, Yongsik Sin
Summary: The Yeongsan River estuary in South Korea is experiencing increased concentrations of nutrients and organic matter due to the presence of a sea dike. Our study investigated the spatiotemporal variations in nutrient limitation in the freshwater and saltwater zones of the estuary. We used the N:P ratio and conducted bioassay experiments to evaluate potential and actual nutrient limitations. The results showed that phosphorus (P) was the limiting nutrient in both zones, but the limitation varied with season and location.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Isabella Scroccaro, Yvette H. Spitz, Charles M. Seaton
Summary: In this study, the influence of local wind on salinity intrusion in the Columbia River estuary is investigated using the hydrodynamic unstructured-grid model SELFE. Numerical simulations are carried out for realistic conditions in 2014, with different resolutions of atmospheric forcing. The results show that the resolution of atmospheric forcing matters and strong episodic winds can alter the salt intrusion length in the estuary, with easterly winds tending to increase it and westerly winds tending to decrease it. The findings also suggest that energetic winds can have different effects on salt intrusion in the north and south channels of the estuary.
Article
Environmental Sciences
Norbert Kamjunke, Holger Brix, Gotz Floeser, Ingeborg Bussmann, Claudia Schuetze, Eric P. Achterberg, Uta Koedel, Philipp Fischer, Louise Rewrie, Tina Sanders, Dietrich Borchardt, Markus Weitere
Summary: The nutrient and carbon dynamics within river-estuary-coastal water systems were analyzed to understand the flux of matter from the terrestrial environment to the ocean. The study revealed that the distribution and variations of nutrients and carbon varied significantly in different water environments, influenced by the travel time of water and nutrient fluxes, thereby affecting the functionality and stability of the aquatic ecosystems.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
William J. Templeton, David A. Jay, Heida L. Diefenderfer, Stefan A. Talke
Summary: Decreases in shallow-water habitat area have negatively impacted salmonid populations in the Lower Columbia River and Estuary. Levees were found to be the largest cause of SWHA loss.
ESTUARIES AND COASTS
(2023)
Article
Environmental Sciences
Wei Tao, Lixia Niu, Yanhong Dong, Tao Fu, Quansheng Lou
Summary: The study in the Pearl River Estuary revealed a significant increase in nitrogen and phosphorus concentrations over the past two decades, largely influenced by riverine inputs. Phosphorus accumulation in the northeast region led to eutrophication risks and blooms, impacting the aquatic environment. The biogeochemical processes in the estuary were highly sensitive to nutrient pollution, particularly nitrogen and phosphorus, with phosphorus being identified as the limiting factor for phytoplankton growth.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Engineering, Environmental
Min Nina Xu, Yanhua Wu, Xiao Zhang, Jin-Ming Tang, Ehui Tan, Zhen-Zhen Zheng, Moge Du, Xiuli Yan, Shuh-Ji Kao
Summary: The reactive nitrogen emitted from continents significantly affects the nitrogen cycle and leads to eutrophication and hypoxia. In the Pearl River Estuary, nitrogen transfer dynamics and nitrogen speciation were examined. Light inhibited nitrification but enhanced nitrogen uptake. Ammonium oxidation and uptake decreased seaward, while nitrite and nitrate uptake increased. Oxygen was produced through nitrogen transformation processes, and although ammonium input was high, it was rapidly consumed and transformed into particulate organic or nitrate forms.
Article
Limnology
Wenjing Fu, Xiaomei Xu, Ellen M. Druffel, Xuchen Wang, Shuwen Sun, Chunle Luo, Hongmei Zhang, Di Fan
Summary: The study conducted carbon isotope analysis of sediment samples collected from the East China Sea, Yellow/Bohai Sea, and South China Sea, revealing that marine-derived young organic carbon degrades preferentially, resulting in high concentrations of DOC and DIC in pore water. A dual-isotope three-end-member model was used to estimate the contributions of different sources to SOC, DOC, and DIC. The research demonstrated that marginal sea sediments play a significant role in carbon and nutrient cycling in the ocean by acting as a major pathway for young DOC and DIC fluxes into the water column.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Engineering, Marine
Tracey Schafer, Nicole Dix, Shannon Dunnigan, K. Ramesh Reddy, Todd Z. Osborne
Summary: Hurricanes have the ability to export large amounts of nutrients from terrestrial systems into aquatic networks, affecting ecosystem metabolism. A study in the blackwater river of Florida found that hurricanes, especially after wet summer conditions, significantly increased the export of dissolved organic carbon. However, lower-category hurricanes may not have a significant impact on organic matter export.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Marine & Freshwater Biology
Sheng Ke, Peng Zhang, Shujun Ou, Junxiao Zhang, Jiyu Chen, Jibiao Zhang
Summary: Human activities and climate change have altered the ecosystem of the Pearl River Estuary, leading to increased nutrient levels in coastal waters. This study examined the spatiotemporal patterns and composition of dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) in the estuary, as well as their relationships with eutrophication and environmental factors.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)
Article
Marine & Freshwater Biology
Xijie Yin, Yunpeng Lin, Yunhai Li, Liang Wang, Zhilei Sun, Guogang Li
Summary: The study examined the cycling of inorganic sulfide species and the control mechanisms in sediments of the Pearl River Estuary (PRE). The formation of iron sulfides (AVS and pyrite) was mainly influenced by the reactive iron content in the sediments, with variations in different sediment depths. The delta S-34 values of AVS and SO42- increased synchronously with depth, while the delta S-34 value of pyrite increased slowly due to the burial time. The burial and formation of pyrite differed in different sub-regions of the PRE.
ESTUARINE COASTAL AND SHELF SCIENCE
(2023)
Article
Environmental Sciences
Brian E. Lapointe, Rachel A. Brewton, Lynn E. Wilking, Laura W. Herren
Summary: In Florida's Indian River Lagoon, anthropogenic eutrophication has led to harmful algal blooms and seagrass losses. Policy makers implemented fertilizer bans to improve water quality, but the study found that nutrient concentrations and nitrogen isotope values actually increased after the bans were enacted. This suggests that human waste is a primary contributor to the eutrophication problem in the lagoon, highlighting the insufficiency of current management actions.
MARINE POLLUTION BULLETIN
(2023)
Article
Water Resources
Linlin Wang, Xiaoyu Lei, Yang Zhou, Xian-zhong Mao, Jing-Cheng Han, Bing Li, Yuefei Huang, Runqi Zhao, Hongsheng Bi, Zhaozhao Tang, Yongqiang Wang, Hailong Li
Summary: This study investigates the hydrological and biogeochemical processes in Shenzhen Bay, revealing changes in DIN components over the past 31 years. The study finds a significant increase in NO3- concentration in the upper bay, which is attributed to reduced runoff NH4+ inputs, tidal currents, and biogeochemical actions.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2023)
Article
Engineering, Environmental
Maodian Liu, Robert P. Mason, Penny Vlahos, Michael M. Whitney, Qianru Zhang, Joseph K. Warren, Xuejun Wang, Zofia Baumann
Summary: This study investigated the seasonal and tidal variations of mercury and methylmercury in Long Island Sound, revealing that the riverine input of organic matter and inorganic mercury stimulates methylmercury production, and tidal cycles further contribute to the remobilization of deposited mercury. The findings highlight the significance of water column biogeochemical processes in regulating methylmercury levels in temperate estuarine ecosystems.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Ecology
W. Gregory Hood, Katie Blauvelt, Daniel L. Bottom, Janine M. Castro, Gary E. Johnson, Kim K. Jones, Kirk L. Krueger, Ronald M. Thom, Andy Wilson
Summary: To increase survival of diverse Columbia River salmon populations and life history types, a landscape framework was developed for habitat restoration to assess and reduce habitat fragmentation. By evaluating each project's benefits to juvenile salmon according to its location in the estuary relative to other habitat, the restoration project assessments were improved.
RESTORATION ECOLOGY
(2022)
Article
Meteorology & Atmospheric Sciences
Tuomas Karna, Antnio M. Baptista, Jesse E. Lopez, Paul J. Turner, Craig McNeil, Thomas B. Sanford
Article
Geosciences, Multidisciplinary
Antonio M. Baptista, Charles Seaton, Michael P. Wilkin, Sarah F. Riseman, Joseph A. Needoba, David Maier, Paul J. Turner, Tuomas Kaernae, Jesse E. Lopez, Lydie Herfort, V. M. Megler, Craig McNeil, Byron C. Crump, Tawnya D. Peterson, Yvette H. Spitz, Holly M. Simon
FRONTIERS OF EARTH SCIENCE
(2015)
Article
Microbiology
M. W. Smith, R. E. Davis, N. D. Youngblut, T. Karna, L. Herfort, R. J. Whitaker, W. W. Metcalf, B. M. Tebo, A. M. Baptista, H. M. Simon
FRONTIERS IN MICROBIOLOGY
(2015)
Article
Ecology
Brian J. Burke, James J. Anderson, Jessica A. Miller, Londi Tomaro, David J. Teel, Neil S. Banas, Antonio M. Baptista
ENVIRONMENTAL BIOLOGY OF FISHES
(2016)
Article
Marine & Freshwater Biology
Tuomas Karna, Antonio M. Baptista
ESTUARINE COASTAL AND SHELF SCIENCE
(2016)
Article
Meteorology & Atmospheric Sciences
Tuomas Kaernae, Antonio M. Baptista
Article
Meteorology & Atmospheric Sciences
John Wilkin, Leslie Rosenfeld, Arthur Allen, Rebecca Baltes, Antonio Baptista, Ruoying He, Patrick Hogan, Alexander Kurapov, Avichal Mehra, Josie Quintrell, David Schwab, Richard Signell, Jane Smith
JOURNAL OF OPERATIONAL OCEANOGRAPHY
(2017)
Article
Meteorology & Atmospheric Sciences
Jesse E. Lopez, Antonio M. Baptista
Article
Meteorology & Atmospheric Sciences
Valentin Vallaeys, Tuomas Karna, Philippe Delandmeter, Jonathan Lambrechts, Antonio M. Baptista, Eric Deleersnijder, Emmanuel Hanert
Article
Marine & Freshwater Biology
Brian J. Burke, James J. Anderson, Antonio M. Baptista
Article
Fisheries
Jessica A. Miller, David J. Teel, Antonio Baptista, Cheryl A. Morgan
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
(2013)
Article
Environmental Sciences
S. L. Braeuer, K. Kranzler, N. Goodson, D. Murphy, H. M. Simon, A. M. Baptista, B. M. Tebo
ESTUARIES AND COASTS
(2013)
Article
Environmental Sciences
Alberto Azevedo, Anabela Oliveira, Andre B. Fortunato, Joseph Zhang, Antonio M. Baptista
MARINE POLLUTION BULLETIN
(2014)
Article
Multidisciplinary Sciences
Jessica A. Miller, David J. Teel, William T. Peterson, Antonio M. Baptista