Article
Oceanography
Juan Yu, Su Wang, Jing-Guang Lai, Ji-Yuan Tian, Hao-Quan Zhang, Gui-Peng Yang, Rong Chen
Summary: This study investigated the spatial distributions of DMS, DMSP, DLA, and the abundances of bacteria, DMSP-consuming bacteria, and dimethyl sulfoxide-consuming bacteria in the surface seawater of the Bohai Sea and Yellow Sea during autumn 2020. The results showed that the distributions of DMS and dissolved DMSP were significantly correlated with DLA. Grazing by microzooplankton promoted the conversion of DMSP to DMS, and mesozooplankton copepod grazing stimulated DMS production.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Biotechnology & Applied Microbiology
Pei-Feng Li, Pei-Pei Gao, Chun-Ying Liu, Hong-Hai Zhang, Gui-Peng Yang
Summary: Dimethyl sulfide (DMS) is an important trace gas transferred from the ocean to the atmosphere, produced by marine algae through the enzymatic cleavage of dimethylsulfoniopropionate (DMSP) yielding DMS and acrylic acid (AA). The production kinetics of DMS and AA from dissolved DMSP (DMSPd) in Prorocentrum minimum cultures varied during different growth stages, with DMS production following Michaelis-Menten kinetics and AA production showing a nearly linear fit. The ratios of DMS/AA and DMS/(DMSP + AA) were low, indicating a non-DMS-production pathway for DMSP degradation.
JOURNAL OF APPLIED PHYCOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Nuoxuan Wang, Shanshan Wang, Jinpei Yan, Miming Zhang
Summary: Oceanic short-lived trace gases, such as DMS and isoprene, have significant impacts on the exchange between the surface ocean and the lower atmosphere. A fully automatic measurement method for these gases is lacking, making data collection challenging. In this study, we enhanced our previous purge and trap system for measuring DMS and isoprene in air and seawater. The system demonstrated reliability and stability, with high linear correlations and low detection limits. The developed method successfully detected seawater and air samples and could be widely adopted in labs still using traditional low automatic purge and trap systems.
Article
Oceanography
Feng Xu, Hong-Hai Zhang, Teng Jia, Shi-Bo Yan, Jin-Wei Wu, Chun-Ying Liu, Gui-Peng Yang
Summary: Continuous input from the Changjiang River significantly reshuffled the ecosystems in the Changjiang Estuary and adjacent East China Sea, impacting the production, distribution, and emission of marine dimethyl sulfide (DMS). The effect of phytoplankton biomass and composition on DMS under different nutrient inputs remains poorly understood. Our findings indicate that changes in nutrient inputs will promote DMS emissions from the Changjiang Estuary.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Environmental Sciences
Ki-Tae Park, Young Jun Yoon, Kitack Lee, Peter Tunved, Radovan Krejci, Johan Strom, Eunho Jang, Hyo Jin Kang, Sehyun Jang, Jiyeon Park, Bang Yong Lee, Rita Traversi, Silvia Becagli, Ove Hermansen
Summary: The study demonstrates the significant influence of DMS on the physiochemical properties of aerosol particles and CCN in the Arctic atmosphere, particularly during new particle formation and growth events. This finding provides new insights into the role of DMS in climate regulation.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Chemistry, Analytical
Jamila B. Santiago, Fortunato B. Sevilla
Summary: A simple and low-cost method using digital imaging colorimetry based on a smartphone was developed for the measurement of dimethyl sulfide (DMS) in wastewater. The method proved effective in measuring DMS concentration through digital image analysis and color values, showing good correlation with traditional detection methods.
MICROCHEMICAL JOURNAL
(2022)
Article
Chemistry, Analytical
Yulong Liu, Jiubin Chen, Jianfeng Liu, Pengxue Gai, David Au Yang, Wang Zheng, Yanbin Li, Dan Li, Hongming Cai, Wei Yuan, Yuansheng Li
Summary: This study introduces a new coprecipitation method for accurate measurement of mercury (Hg) isotopes in seawater, allowing for quantitative precipitation of Hg by adding different reagents sequentially. The validation of the method shows high recovery rate and relatively low procedure blank, indicating its potential application in marine Hg systematics and global Hg cycling research.
ANALYTICAL CHEMISTRY
(2021)
Article
Geosciences, Multidisciplinary
Shrivardhan Hulswar, Rafel Simo, Marti Gali, Thomas G. Bell, Arancha Lana, Swaleha Inamdar, Paul R. Halloran, George Manville, Anoop Sharad Mahajan
Summary: This paper presents an updated estimation of global surface seawater dimethyl sulfide (DMS) climatology with significant improvements in data handling and processing. The results show a decrease in the global annual mean DMS concentration compared to the previous estimation, and large regional differences are observed. The global sea-to-air flux of DMS has also decreased, with the most significant changes occurring in high concentration regions such as the polar oceans.
EARTH SYSTEM SCIENCE DATA
(2022)
Article
Environmental Sciences
Robin Benard, Martine Lizotte, Maurice Levasseur, Michael Scarratt, Sonia Michaud, Michel Starr, Jean-Eric Tremblay, Ronald P. Kiene, Sohiko Kameyama
Summary: Experimental study on the impact of anthropogenic pH perturbation (ApHP) on DMS and DMSP concentrations revealed a reduction in microbial DMS yield, while microbial scavenging efficiency of dissolved DMSP remained unaffected. These findings suggest a potential link between ApHP and alterations in the microbial breakdown of DMSP, which could have implications for Earth's future climate.
ELEMENTA-SCIENCE OF THE ANTHROPOCENE
(2021)
Article
Chemistry, Analytical
Jin-Wei Wu, Feng Xu, Long Liu, Mei-Hui Ren, Hong-Hai Zhang, Gui-Peng Yang
Summary: The study investigated the concentrations of DMS and DMSP in the East China Sea during summer and their contribution to atmospheric non-sea-salt sulfate. The results show that marine DMS release is an important factor in the East China Sea during summer and cannot be neglected.
ENVIRONMENTAL CHEMISTRY
(2021)
Article
Ecology
George Manville, Thomas G. Bell, Jane P. Mulcahy, Rafel Simo, Marti Gali, Anoop S. Mahajan, Shrivardhan Hulswar, Paul R. Halloran
Summary: Dimethylsulfide (DMS) emitted from the ocean plays a significant role in our planet's climate. This study investigates the variability of DMS concentrations at local scales and identifies the mechanisms driving this variability. The results show that both physical and biogeochemical processes contribute to DMS variability, with mesoscale eddies playing an important role. The study also highlights the regional differences in DMS variability and suggests that submesoscale features should be considered in DMS models and parameterizations.
Article
Engineering, Electrical & Electronic
Changxin Zhai, Yu Li, Shanshan Wang, Jibo Xu, Zheng Wen, Jing Wang
Summary: A high sensitivity and easily achievable measurement for temperature sensing in seawater by utilizing the high birefringence of the bow tie fiber is proposed in this paper. The formation of birefringence is analyzed and the Jones matrix is used to calculate the spectrum. Experiments based on the reflecting polarization interferometer were conducted and the theoretical and experimental results showed high consistency. The changing rules of dips were also investigated, indicating that the temperature sensitivity and free spectral range could be adjusted by changing the wavelength or the length of the bow tie fiber.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Xingyu Wang, Wei Liu, Tianyi Wu, Chang Guo, Yijun Zhang, Shanghong Zhao, Chen Dong
Summary: The paper proposes an MDI-QKD scheme with MRR technology, simplifying communication requirements and providing superior performance. Simulation results show the feasibility of the scheme under classical attacks, making a significant contribution towards achieving dynamic quantum networks.
Article
Physics, Multidisciplinary
Hongyang Hu, Hai Zhong, Wei Ye, Ying Guo
Summary: This paper proposes a protocol based on STCQ communication on the oceanic quantum channel, which eliminates detection-related imperfections by being measurement-device-independent. Numerical simulations show that the proposed protocol can simultaneously enable two-way classical communication and CV-MDI QKD with slight performance degradation in transmission distance.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Junyang Lu, Zhenrong Zhang, Yang Yu, Shangpeng Qin, Fangyuan Zhang, Minwei Li, Qiang Bian, Mengxiao Yin, Junbo Yang
Summary: In this study, a reflective optical fiber sensor based on a PDMS-sealed optical microfiber coupler combined with a sagnac loop was proposed to achieve simultaneous measurement of temperature and pressure in seawater. The sensor showed improved sensitivity and structural stability compared to bare fiber sensors. Experimental results demonstrated the sensor's ability to demodulate temperature and pressure sensing simultaneously, with average errors of 1.61% and 5.02%, respectively. The sensor's compact structure, ease of fabrication, high sensitivity, fast response speed, and high stability make it comparable to existing TD sensors for marine environmental monitoring and ocean dynamics research.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Biology
Kylie Owen, Kentaro Saeki, Joseph D. Warren, Alessandro Bocconcelli, David N. Wiley, Shin-Ichi Ohira, Annette Bombosch, Kei Toda, Daniel P. Zitterbart
Summary: Finding prey is essential to marine predators' survival, and natural DMS concentrations are spatially correlated to zooplankton biomass. Agent simulations demonstrate that tracking fine-scale gradients of DMS leads zooplankton predators to areas with higher prey biomass efficiently.
COMMUNICATIONS BIOLOGY
(2021)
Article
Ecology
Sara Labrousse, David Iles, Lise Viollat, Peter Fretwell, Philip N. Trathan, Daniel P. Zitterbart, Stephanie Jenouvrier, Michelle LaRue
Summary: The study found that using very high-resolution satellite imagery to estimate emperor penguin populations may not provide a complete understanding of colony size for a given year. Factors such as sun azimuth, elevation, and penguin patchiness were highlighted as important influences on calculated areas. Despite intra-seasonal variability, reliable population trends can be obtained by including satellite-related and environmental covariates and aggregating indices across time and space.
REMOTE SENSING IN ECOLOGY AND CONSERVATION
(2022)
Article
Chemistry, Multidisciplinary
Kentaro Saeki, Kazuya Ikari, Hiroyuki Yokoi, Shin-Ichi Ohira, Hiroshi Okochi, Kei Toda
Summary: Diamines, including Dap and Put, are essential organic bases for plants and are emitted into the atmosphere. Analysis shows that amide derivatives of Dap and Put are found in higher concentrations in the atmosphere than their source diamine. These aminoamides are likely produced after the release of Dap and Put into the atmosphere. The concentrations of biogenic diamines and aminoamides vary throughout the day, with lower concentrations during sunny conditions, indicating photochemical decomposition. They readily bond with water vapor and sulfuric acid in the atmosphere and may play a role in the formation of particles and organic aerosols in the forest atmosphere.
ACS EARTH AND SPACE CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Yusuke Okazaki, Shigeyuki Hoshi, Toshimasa Kato, Takeo Fukui, Kei Toda, Shin-Ichi Ohira
Summary: This study investigates the electrodialytic enrichment of metal cations for monitoring ultra-pure water quality. A newly designed enrichment device is used to transfer metal ions to an acidic solution, improving the sensitivity of ICP-MS analysis. The use of dynamic gravimetric method for preparing standards avoids contamination from volumetric flasks.
Article
Chemistry, Multidisciplinary
Yumi Sugo, Shin-Ichi Ohira, Hinako Manabe, Yo-hei Maruyama, Naoaki Yamazaki, Ryoma Miyachi, Kei Toda, Noriko S. Ishioka, Masanobu Mori
Summary: A highly efficient separation method was developed to recover Cu-64 from the target material generated by proton beam irradiation. The method utilizes a flow electrolysis cell and chemical reaction separation technique to achieve separation and recovery of ultratrace radioisotopes.
Article
Multidisciplinary Sciences
Aymeric Houstin, Daniel P. Zitterbart, Alexander Winterl, Sebastian Richter, Victor Planas-Bielsa, Damien Chevallier, Andre Ancel, Jerome Fournier, Ben Fabry, Celine Le Bohec
Summary: An increasing number of marine animals are being equipped with biologgers to study their physiology, behavior, and ecology. This study proposes alternative techniques for emperor penguin capture and logger deployment to minimize potential negative impacts. The traditional attachment method was found to cause excessive feather breakage and device loss, leading to the suggestion of an alternative technique for back-mounted devices. The findings highlight the importance of monitoring the impacts of biologger deployments and improving methods to minimize disturbance.
Article
Biodiversity Conservation
Gina L. Lonati, Daniel P. Zitterbart, Carolyn A. Miller, Peter Corkeron, Christin T. Murphy, Michael J. Moore
Summary: The use of remotely piloted aircraft systems (RPAS) and infrared thermography (IRT) provides new opportunities to study and monitor the health and behavior of large whales, including exploring heat loss patterns, tracking subsurface individuals, and detecting changes in superficial blood circulation.
ENDANGERED SPECIES RESEARCH
(2022)
Article
Environmental Sciences
Elisabeth S. M. Deschaseaux, Hilton B. Swan, Damien T. Maher, Graham B. Jones, Kai G. Schulz, Edwin P. Koveke, Kei Toda, Bradley D. Eyre
Summary: The Earth's Radiation Budget is influenced by the balance between biogenic volatile organic compounds (BVOCs) and greenhouse gases (GHGs). The study found that coral reefs release both dimethyl sulfide (DMS) and methane (CH4), and these two compounds are closely linked in emissions. These findings are important for understanding the complexity of compound emissions in coral reef systems and their role in climate regulation.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Md Aminul Hague, Kei Toda, Shin-Ichi Ohire
Summary: This study presents a general purpose electrodialysis approach to produce highly pure ILs with a purity of greater than 99%. This method offers advantages over conventional methods by avoiding the use of hazardous solvents, eliminating purification processes, and preventing the generation of side products. Moreover, this membrane-based technology allows for the easy generation of various mixed ILs.
Article
Biodiversity Conservation
Loicka M. R. Baille, Daniel P. Zitterbart
Summary: The study develops an agent-based model to assess the effectiveness of thermal imaging systems in reducing vessel strikes. The detection range of the systems is found to be crucial for their efficacy and needs to be chosen based on vessel characteristics. Combining large-scale and small-scale mitigation strategies increases protection.
ENDANGERED SPECIES RESEARCH
(2022)
Article
Multidisciplinary Sciences
Aymeric Houstin, Daniel P. P. Zitterbart, Karine Heerah, Olaf Eisen, Victor Planas-Bielsa, Ben Fabry, Celine Le Bohec
Summary: Conservation efforts in the Southern Ocean are insufficient for protecting juvenile emperor penguins, as they spend the majority of their time outside existing marine protected areas and their distribution extends beyond the defined extent of occurrence.
ROYAL SOCIETY OPEN SCIENCE
(2022)
Article
Environmental Sciences
Clara Leistenschneider, Celine Le Bohec, Olaf Eisen, Aymeric Houstin, Simon Neff, Sebastian Primpke, Daniel P. Zitterbart, Patricia Burkhardt-Holm, Gunnar Gerdts
Summary: This study investigated the occurrence of microplastics (MP) in emperor penguins for the first time. The results showed that MP concentrations in the emperor penguins from Atka Bay colony were currently at low levels, with no biomagnification occurring via trophic transfer. The study emphasizes the importance of standardized procedures for sampling, sample processing and analyses.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Analytical
Maria Shichijo, Kazumasa Okamoto, Toru Takahashi, Miharu Nomura, Shin-ichi Ohira, Hitoshi Mizuguchi, Hideji Tanaka, Masaki Takeuchi
Summary: This paper proposes a feedback standard addition method coupled flow injection analysis, FB-SAM/FIA, for the rapid and accurate determination of trace interest in seawater samples. This approach significantly improves the sample throughput compared to the manual standard addition method. The FB-SAM/FIA technique successfully applied to the determination of NO2- in natural seawater samples.
MICROCHEMICAL JOURNAL
(2023)
Review
Ecology
Julian Gutt, Stefanie Arndt, David Keith Alan Barnes, Horst Bornemann, Thomas Brey, Olaf Eisen, Hauke Flores, Huw Griffiths, Christian Haas, Stefan Hain, Tore Hattermann, Christoph Held, Mario Hoppema, Enrique Isla, Markus Janout, Celine Le Bohec, Heike Link, Felix Christopher Mark, Sebastien Moreau, Scarlett Trimborn, Ilse van Opzeeland, Hans-Otto Poertner, Fokje Schaafsma, Katharina Teschke, Sandra Tippenhauer, Anton Van de Putte, Mia Wege, Daniel Zitterbart, Dieter Piepenburg
Summary: Systematic long-term studies on ecosystem dynamics are lacking in the East Antarctic Southern Ocean. This study proposes a framework for a cross-disciplinary long-term study in the eastern Weddell Sea and adjacent areas, which have so far experienced comparatively muted climate and environmental change. By establishing an observatory and conducting regular surveys, researchers aim to explore and map long-term changes in ocean dynamics, geochemistry, biodiversity, and ecosystem functions and services. The integrated approach will provide crucial data for understanding and projecting the consequences of climate change and supporting conservation efforts in the Southern Ocean.
Article
Environmental Sciences
Kunio Sakakibara, Misaki Taira, Kanako Nagatomi, Genki Kuriyama, Shin-Ichi Ohira, Kei Toda
Summary: In this study, an automated sampler/preconcentrator was developed to monitor variations in ortho- and para-NPs over time in the gas and particle phases separately. The study found that NPs were mostly present in the gas phase and concentrations increased at night. Additionally, 2-nitro-o-cresol was detected for the first time as one of the major NPs in winter.
ENVIRONMENTAL SCIENCE-ATMOSPHERES
(2022)