Article
Environmental Sciences
Wenxia Zhang, John P. Dunne, Hui Wu, Feng Zhou
Summary: The coastal region in east China is facing massive anthropogenic eutrophication and seasonal hypoxia threat. Future climate changes will worsen the current hypoxia by exacerbating anthropogenic eutrophication. The disappearance of the Yellow Sea Cold Water Mass and the strengthening of shelf vertical stratification are projected by the end of the 21st century.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Michiyo Yamamoto-Kawai, Soichiro Ito, Haruko Kurihara, Jota Kanda
Summary: The study investigated seasonal and interannual variabilities in the partial pressure of CO2 (pCO(2)), pH, and calcium carbonate saturation state (omega) in Tokyo Bay, Japan, finding that these parameters vary significantly in surface and bottom waters due to various factors such as photosynthesis, respiration, warming/cooling, and freshwater input. Anoxic conditions in the bottom waters caused calcium carbonate undersaturation, suggesting that de-eutrophication can help slow down ocean acidification in Tokyo Bay.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Amber M. Holdsworth, Li Zhai, Youyu Lu, James R. Christian
Summary: Model projections of ocean circulation and biogeochemistry reveal the importance of high-frequency wind variability in freshwater distribution along the continental shelf of the Canadian Pacific Coast.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Samuel C. Mogen, Nicole S. Lovenduski, Allysa R. Dallmann, Luke Gregor, Adrienne J. Sutton, Steven J. Bograd, Nathali Cordero Quiros, Emanuele Di Lorenzo, Elliott L. Hazen, Michael G. Jacox, Mercedes Pozo Buil, Stephen Yeager
Summary: This study characterizes the biogeochemical properties of the Eastern North Pacific upper ocean during the Winter of 2013-2014 using observations and models, and finds that the Blob is associated with increased aragonite saturation and decreased oxygen concentration.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Lawrence Patrick C. Bernardo, Masahiko Fujii, Tsuneo Ono
Summary: This study developed an approach to evaluate and predict the combined effects of ocean acidification and deoxygenation on calcifying organisms along the coast of Japan. The model simulations suggest that global warming and ocean acidification may have significant impacts on calcifying organisms.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Taavi Liblik, Stella-Theresa Stoicescu, Fred Buschmann, Madis-Jaak Lilover, Urmas Lips
Summary: The Gulf of Riga in the eastern Baltic Sea experiences seasonal oxygen depletion in its deep layer. Hourly measurements in 2021 revealed the complete cycle of hypoxia development and relaxation, with hypoxia occurring from 27 June to 22 October. The decline in oxygen levels followed a seasonal pattern, with additional short-term variability caused by various processes. Inflows of saltier water from the Central Baltic resulted in ventilation events in the deep layer, further affecting the oxygen levels.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Matthew H. H. Long, Jordan W. Mora
Summary: Coastal nutrient pollution, or eutrophication, often occurs due to human activities in terrestrial watersheds, leading to degraded water quality over time. The management and monitoring of estuarine systems usually lag behind environmental degradation. In the case of Waquoit Bay National Estuarine Research Reserve, the loss of eelgrass meadows and the decline in macroalgal biomass have resulted in shifts in water quality and ecosystem structure, with an increase in phytoplankton biomass and a shift towards pelagic dominance. This shift may have wider implications for other eutrophic and warming estuaries in the future.
ESTUARIES AND COASTS
(2023)
Article
Limnology
Martin Wahl, Francisco R. Barboza, Bjoern Buchholz, Sergey Dobretsov, Tamar Guy-Haim, Gil Rilov, Renate Schuett, Fabian Wolf, Jahangir Vajedsamiei, Maryam Yazdanpanah, Christian Pansch
Summary: The study revealed that ocean warming was beneficial in early and late summer in the Western Baltic, but detrimental during midsummer when temperatures were highest. Upwelling without ocean warming generally had weak benefits, but these benefits tended to disappear with increasing ocean warming. Late summer upwelling-induced hypoxia impacted some grazer species, but had no significant impact on macroalgae.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Limnology
Kristy J. Kroeker, Emily M. Donham, Kate Vylet, Joseph K. Warren, Julia Cheresh, Jerome Fiechter, Jan Freiwald, Yuichiro Takeshita
Summary: In upwelling systems, fluctuations in seawater pH, dissolved oxygen (DO), and temperature can lead to exposure to extreme conditions for marine species. This study characterized the variability and covariance among these drivers using a time series of observations and a simulation for the California coast. It found that sites with strong upwelling had the greatest intensity and duration of exposure to extreme pH and DO conditions, while sites with weak upwelling had higher and more variable temperature.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Review
Environmental Sciences
Donat-P. Haeder, Kunshan Gao
Summary: Aquatic ecosystems contribute 50% of global productivity and play a crucial role in mitigating climate change. Factors such as water temperature, ocean acidification, nutrient availability, deoxygenation, and exposure to UV radiation interact to either enhance or decrease productivity. While ocean warming and deoxygenation may have opposite effects on mitochondrial respiration, they synergistically affect plankton migration and N-2-fixation of diazotrophs. Ocean acidification and elevated pCO(2) have controversial effects on marine primary producers, but they can worsen viral attacks on microalgae and reduce calcification of algal calcifiers when combined with UV radiation. Field observations over a long period of time are limited, but future studies are expected to explore the responses and mechanisms to multiple drivers in different regions.
Review
Green & Sustainable Science & Technology
Shama E. Haque
Summary: Emerging changes in water availability in Florida are the combined result of human perturbations, natural variability, and climate change. The state is vulnerable to sea level rise, saltwater intrusion, eutrophication, sedimentation, and ocean acidification. The review paper highlights the influences of changing climate on groundwater aquifers, eutrophication, the Everglades, runoff and sedimentation, and coastal water acidification. The findings indicate significant environmental impacts and the need for adaptation to climate change effects in Florida.
Article
Environmental Sciences
Joan M. Bernhard, Johannes C. Wit, Victoria R. Starczak, David J. Beaudoin, William G. Phalen, Daniel C. McCorkle
Summary: Ocean chemistry is changing due to human activities, with increasing CO2 concentrations causing ocean acidification and oxygen depletion. Research shows that hypoxia is the major driving factor, with warming being secondary, and different foraminiferal species exhibit varied responses to these stressors.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Laura Ramajo, Camila Sola-Hidalgo, Maria Valladares, Orlando Astudillo, Jorge Inostroza
Summary: This study assessed the physiological sensitivity of Argopecten purpuratus at different life stages to upwelling events. The results showed that seasonal differences in upwelling events significantly impacted the physiological performance of A. purpuratus, especially during spring. However, the survivorship of A. purpuratus was not significantly affected by upwelling intensity, indicating a high level of physiological flexibility and local adaptation to fluctuating environmental conditions.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Marine
Pavel Tishchenko, Vyacheslav Lobanov, Dmitry Kaplunenko, Sergey Sagalaev, Petr Tishchenko
Summary: The research reveals that acidification and deoxygenation are occurring in the bottom waters of the Peter the Great Bay in the Japan/East Sea, particularly at a maximum rate around 750 meters. Climate change is causing a decrease in pH and dissolved oxygen concentrations, while increasing levels of CO2 partial pressure and nutrient concentrations. The variability in hydrochemical properties can be explained by the slowdown in vertical ventilation of the water column and eutrophication.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Michael Lintner, Bianca Lintner, Michael Schagerl, Wolfgang Wanek, Petra Heinz
Summary: We studied the metabolic activity of Heterostegina depressa under different light conditions. The photosynthetic performance and isotope uptake of the specimens were measured. Light supply significantly affected the photosynthetic performance, while the photosymbionts and holobionts could survive and be reactivated after prolonged darkness. The assimilation of C-13-carbonate and N-15-nitrate is mainly controlled by the photosymbionts, while N-15-ammonium and C-13-glucose utilization is regulated by both the symbiont and the host cells.
SCIENTIFIC REPORTS
(2023)