Article
Oceanography
Ouyang Zhangxian, Andrew Collins, Yun Li, Di Qi, Kevin R. Arrigo, Yanpei Zhuang, Shigeto Nishino, Matthew P. Humphreys, Naohiro Kosugi, Akihiko Murata, David L. Kirchman, Liqi Chen, Jianfang Chen, Wei-Jun Cai
Summary: The Chukchi Sea is becoming a larger sink for CO2 due to rapid climate changes. Understanding the seasonal variations in air-sea CO2 exchange and the biogeochemical dynamics is crucial for predicting the impacts of climate change on the ocean and the feedbacks. The study finds that thermal and non-thermal effects have different impacts on sea surface CO2 levels and air-sea CO2 flux in different water masses. The findings also highlight the importance of phytoplankton stoichiometry in CO2 uptake.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Geosciences, Multidisciplinary
Jiaoyang Su, Christina Schallenberg, Tyler Rohr, Peter G. Strutton, Helen E. Phillips
Summary: By integrating the oxygen profiles from biogeochemical Argo floats, we developed a novel approach to estimate annual net community production in the Southern Ocean. Our results suggest that the Southern Ocean plays a more important role in regulating oceanic carbon storage, atmospheric CO2 exchange, and climate than previously assumed.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Multidisciplinary Sciences
Eun Young Kwon, M. G. Sreeush, Axel Timmermann, David M. Karl, Matthew J. Church, Sun-Seon Lee, Ryohei Yamaguchi
Summary: Marine phytoplankton play important roles in regulating atmospheric carbon dioxide and sustaining marine ecosystems through converting inorganic carbon to organic carbon and exporting it to the deep sea via the biological carbon pump. However, the projections on future changes in marine net primary production are still highly uncertain.
Article
Environmental Sciences
M. B. Alkire, I. Polyakov, R. W. Macdonald
Summary: The loss of sea ice and changes to vertical stratification in the Arctic Ocean are impacting light and nutrient availability, which has significant effects on net community production and carbon export. However, a lack of quality data hinders accurate quantification of these changes.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Oceanography
Zuchuan Li, M. Susan Lozier, Nicolas Cassar
Summary: Mixed-layer dynamics have a significant impact on nutrient and light availability for phytoplankton in the Southern Ocean. The study highlights the complex relationship between mixed-layer dynamics and net community production (NCP) on various timescales, showing that NCP is influenced by mixed layer depth differently over intraseasonal, seasonal, and interannual scales.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Ecology
Krysten Rutherford, Katja Fennel, Dariia Atamanchuk, Douglas Wallace, Helmuth Thomas
Summary: Continental shelves are disproportionately affected by climate change and play a significant role in global air-sea carbon dioxide (CO2) fluxes. The Scotian Shelf, a mid-latitude region in the northwest North Atlantic, exhibits strong seasonality in CO2 partial pressure (pCO(2)), acting as a net source in contrast to global trends due to biological drawdown of dissolved inorganic carbon (DIC) in spring and temperature effects. Despite localized events such as coastal upwelling, pCO(2) remains relatively uniform across the shelf, with the regional model successfully reproducing seasonal patterns and simulating CO2 fluxes for different locations.
Article
Environmental Sciences
J. E. Rheuban, P. R. Gassett, D. C. McCorkle, C. W. Hunt, M. Liebman, C. Bastidas, K. O'Brien-Clayton, A. R. Pimenta, E. Silva, P. Vlahos, R. J. Woosley, J. Ries, C. M. Liberti, J. Grear, J. Salisbury, D. C. Brady, K. Guay, M. LaVigne, A. L. Strong, E. Stancioff, E. Turner
Summary: Comprehensive sampling of the carbonate system in estuaries and coastal waters can be challenging due to the complex nature of near-shore environments. The success of the 'Shell Day' event suggests that community science programs can effectively collect TA samples for high-quality analyses. Geographic heterogeneity in both mean and tidal variability in TA was observed, implying that localized predictions may be more accurate than regional ones.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Soyeon Kwon, Inhee Lee, Keyhong Park, Kyoung-Ho Cho, Jinyoung Jung, Taewook Park, Youngju Lee, Chanhyung Jeon, Seongbong Seo, Doshik Hahm
Summary: The Arctic Ocean is undergoing significant changes due to global warming, but our understanding of the effects on its ecosystem is limited. By monitoring the O-2/Ar concentrations in the northern Chukchi Sea, we found that the net community production in 2020 was significantly lower than in 2017, mainly due to reduced ice cover and decreased salinity leading to stronger stratification.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Marine & Freshwater Biology
Kevin J. Flynn, Aditee Mitra
Summary: Plankton phototrophy and heterotrophy have opposing effects on seawater pH. Mixoplankton, which can engage in both activities, have the potential to create a stable pH environment for plankton growth. However, most mixoplankton groups do not stabilize seawater pH. Enhanced phototrophy in mixoplankton through phagotrophy can elevate pH, especially for certain mixoplankton types. Mixoplankton blooms can exceed phytoplankton blooms and can enhance primary production. The dynamics of these blooms depend on the consumption of heterotrophs and/or phototrophs and the succession of the plankton community.
JOURNAL OF PLANKTON RESEARCH
(2023)
Article
Oceanography
Matthew B. B. Alkire, Stephen Riser
Summary: Net community production (NCP) in the Argentine Basin was estimated using nitrate profiles measured by biogeochemical Argo floats. Hydrographic fronts were defined based on potential density anomaly and potential temperature, with the latter being preferred. Monthly median profiles of nitrate were constructed for each zone, and NCP was estimated using three methods. The results showed a decline in NCP from south to north, with primary production during summer months possibly supported by regenerated nitrogen sources due to the scarcity of bioavailable iron.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Multidisciplinary Sciences
Fuminori Hashihama, Ichiro Yasuda, Aki Kumabe, Mitsuhide Sato, Hiroshi Sasaoka, Yosuke Iida, Takuhei Shiozaki, Hiroaki Saito, Jota Kanda, Ken Furuya, Philip W. Boyd, Masao Ishii
Summary: The seasonal drawdown of dissolved inorganic carbon in the subtropical upper ocean contributes significantly to net community production globally. While surface macronutrients are chronically depleted, nanomolar increases in surface nitrate plus nitrite and phosphate from summer to winter in the western subtropical North Pacific are found to be in near-stoichiometric balance with microbial C:N:P ratios. These findings suggest that the nanomolar upward supply of phosphorus and its preferential recycling play a vital role in sustaining net community production in oligotrophic ocean environments.
NATURE COMMUNICATIONS
(2021)
Article
Environmental Sciences
Juan Yu, Ji-Yuan Tian, Guang Gao, Rui Xu, Jing-Guang Lai, Gui-Peng Yang
Summary: The effects of ocean acidification and solar radiation on the growth and production of dimethylsulfoniopropionate (DMSP) in coccolithophores are investigated in this study. It is found that high CO2 concentration decreases cell concentration and DMSP concentration, while UV radiation increases cell concentration and decreases DMSP concentration.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Franziska Pausch, Florian Koch, Christel Hassler, Astrid Bracher, Kai Bischof, Scarlett Trimborn
Summary: This study investigates the responses of Southern Ocean phytoplankton under different climate change scenarios. It finds that under ocean acidification, the numerical dominance of diatoms is reduced in both future mixing scenarios, but their productivity increases.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Thibault de Garidel-Thoron, Sonia Chaabane, Xavier Giraud, Julie Meilland, Lukas Jonkers, Michal Kucera, Geert-Jan A. Brummer, Maria Grigoratou, Fanny M. Monteiro, Mattia Greco, P. Graham Mortyn, Azumi Kuroyanagi, Helene Howa, Gregory Beaugrand, Ralf Schiebel
Summary: Planktonic Foraminifera are marine protozoa that secrete calcareous shells, which provide a geological record of past changes in their community structure. The FORCIS project aims to create a global database to analyze the distribution and turnover of these organisms.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Xianghui Guo, Zhentong Yao, Ying Gao, Yaohua Luo, Yi Xu, Weidong Zhai
Summary: This study investigates carbonate dynamics on the East China Sea (ECS) shelf off the Changjiang Estuary using field observations from 2015 to 2019. It found that the water characteristics varied in different seasons, with an increase in pH and aragonite saturation in surface water during highly productive warm seasons.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
E. H. Shadwick, T. W. Trull, B. Tilbrook, A. J. Sutton, E. Schulz, C. L. Sabine
GLOBAL BIOGEOCHEMICAL CYCLES
(2015)
Article
Geosciences, Multidisciplinary
Susanne E. Craig, Helmuth Thomas, Chris T. Jones, William K. W. Li, Blair J. W. Greenan, Elizabeth H. Shadwick, William J. Burt
JOURNAL OF MARINE SYSTEMS
(2015)
Article
Geosciences, Multidisciplinary
E. H. Shadwick, B. Tilbrook, N. Cassar, T. W. Trull, S. R. Rintoul
JOURNAL OF MARINE SYSTEMS
(2015)
Article
Oceanography
Simone R. Alin, Russell E. Brainard, Nichole N. Price, Jan A. Newton, Anne Cohen, William T. Peterson, Eric H. DeCarlo, Elizabeth H. Shadwick, Scott Noakes, Nina Bednarsek
Article
Oceanography
E. H. Shadwick, B. Tilbrook, K. I. Currie
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2017)
Article
Environmental Sciences
Brian Fry, Dubravko Justic, Philip Riekenberg, Erick M. Swenson, R. Eugene Turner, Lixia Wang, Lora Pride, Nancy N. Rabalais, Janis C. Kurtz, John C. Lehrter, Michael C. Murrell, Elizabeth H. Shadwick, Brandon Boyd
ESTUARIES AND COASTS
(2015)
Article
Geosciences, Multidisciplinary
E. H. Shadwick, S. R. Rintoul, B. Tilbrook, G. D. Williams, N. Young, A. D. Fraser, H. Marchant, J. Smith, T. Tamura
GEOPHYSICAL RESEARCH LETTERS
(2013)
Article
Chemistry, Multidisciplinary
Nicholas P. Roden, Elizabeth H. Shadwick, Bronte Tilbrook, Thomas W. Trull
Article
Multidisciplinary Sciences
E. H. Shadwick, T. W. Trull, H. Thomas, J. A. E. Gibson
SCIENTIFIC REPORTS
(2013)
Article
Oceanography
Simon Pineault, Jean-Eric Tremblay, Michel Gosselin, Helmuth Thomas, Elizabeth Shadwick
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2013)
Article
Oceanography
Agneta Fransson, Melissa Chierici, Lisa A. Miller, Gauthier Carnat, Elizabeth Shadwick, Helmuth Thomas, Simon Pineault, Tim N. Papakyriakou
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2013)
Article
Oceanography
Sergio R. Signorini, Antonio Mannino, Raymond G. Najjar, Marjorie A. M. Friedrichs, Wei-Jun Cai, Joe Salisbury, Zhaohui Aleck Wang, Helmuth Thomas, Elizabeth Shadwick
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2013)
Article
Oceanography
E. H. Shadwick, B. Tilbrook, G. D. Williams
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2014)
Article
Ecology
Katja Fennel, Simone Alin, Leticia Barbero, Wiley Evans, Timothee Bourgeois, Sarah Cooley, John Dunne, Richard A. Feely, Jose Martin Hernandez-Ayon, Xinping Hu, Steven Lohrenz, Frank Muller-Karger, Raymond Najjar, Lisa Robbins, Elizabeth Shadwick, Samantha Siedlecki, Nadja Steiner, Adrienne Sutton, Daniela Turk, Penny Vlahos, Zhaohui Aleck Wang
Article
Chemistry, Multidisciplinary
Morgane Leon, Pieter van Beek, Virginie Sanial, Marc Souhaut, Paul Henderson, Matthew A. Charette
Summary: The analysis of radium and actinium isotopes in seawater requires the collection of large volumes of water and the use of high sensitivity instruments. To concentrate these isotopes, filters impregnated with MnO2 are typically used. However, the extraction efficiency of these filters for the target isotopes needs to be determined.