Article
Environmental Sciences
Jiwon Kang, Hanna Na
Summary: This study investigated the long-term variability of Kuroshio shelf intrusion (KSI) northeast of Taiwan and its relationship with current and temperature variability in the East China Sea (ECS). The results showed that the KSI had significant changes in the 2000s, while it was relatively stable in the 1990s and 2010s, accompanied by a westward shift of the Kuroshio axis and warming.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Marine & Freshwater Biology
Jun Young Seo, Yong Hoon Kim, Jongseong Ryu, Ho Kyung Ha
Summary: In this study, the researchers used acoustic Doppler current profilers to investigate the mechanisms of water and sediment transport in Onsan Bay. They found that water circulation in the bay was influenced by freshwater discharge from the river and exchange with the open sea, as well as by wind-induced currents. The sediment transport within the bay was mainly controlled by estuarine residual circulation, and frequent resuspension events contributed to an increase in sediment concentration. Considering the prevailing winds in the area, sedimentation is expected to persist in Onsan Bay.
ESTUARINE COASTAL AND SHELF SCIENCE
(2023)
Article
Environmental Sciences
Takahiro Toyoda, Kei Sakamoto, Norihisa Usui, Nariaki Hirose, Kiyoshi Tanaka, Takaaki Katsumata, Daisuke Takahashi, Masato Niki, Kunio Kutsuwada, Toru Miyama, Hideyuki Nakano, L. Shogo Urakawa, Kensuke K. Komatsu, Yuma Kawakami, Goro Yamanaka
Summary: The study investigates the intrusion of open-ocean water into Suruga Bay and the generation of related circulation patterns, with results consistent with previous observational studies and providing insights into the influence of western boundary current fluctuations on proximal bays.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Shiho Kobayashi, Kentaro Nagao, Daiki Tsurushima, Satoshi Sasakura, Tateki Fujiwara
Summary: Estuarine circulation is a vertical circulation along the salinity gradient, with deep inflow and shallow inflow modes showing seasonal variability. These seasonal mode changes may affect oxygen and CO2 dynamics in estuaries and nearshore coastal waters. Temperature plays a crucial role in driving these seasonal mode changes in estuarine circulation.
ESTUARIES AND COASTS
(2022)
Article
Environmental Sciences
Jianhua Kang, Zhaohe Luo, Hala. F. Mohamed, Yili Lin, Shuhong Huang, Yu Wang, Wenlu Lan
Summary: This study investigated the impact of photosynthetically produced dissolved organic carbon (PDOC) on the marine carbon cycle and the growth of heterotrophic bacteria (HB) through field investigation and lab experiments. The results showed that the contribution of PDOC to total primary productivity (TPP) varied in different seasons and sectors, and was influenced by factors such as salinity and nitrogen to phosphorus ratios.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Oceanography
Xiangpeng Wang, Yan Du, Yuhong Zhang, Aimei Wang, Tianyu Wang
Summary: This study investigated two processes of high-salinity water intrusion in the northeastern South China Sea during fall-winter of 2015/2016 using data from Argo float, satellite altimetry, and reanalysis. The results showed that eddy pairs and the interior circulation of the South China Sea jointly affected the transport of high-salinity water.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Geosciences, Multidisciplinary
Minoru Ikehara, Shigetaka Kita, Shungo Kawagata
Summary: The study evaluated the oxygen isotopic compositions of the shallow-water benthic foraminifer Hanzawaia nipponica Asano and found it to be a sensitive indicator of environmental changes, making it a useful proxy for reconstructing shallow-water paleoenvironmental changes in the northwest Pacific and its marginal seas.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Ecology
Paul A. Bukaveckas
Summary: The sources and transformation of carbon in estuaries were studied using mass balance and ecosystem metabolism data. The study found that the physiographic setting of the estuaries influenced the forms and fluxes of carbon. Contrary to expectations, the highest retention of organic carbon occurred during periods of high river discharge. In summer, internal cycling of carbon was large compared to external forcing.
Article
Environmental Sciences
Akihiko Morimoto, Menghong Dong, Mahiro Kameda, Taiga Shibakawa, Makiko Hirai, Kouhei Takejiri, Xinyu Guo, Hidetaka Takeoka
Summary: In early July 2018, heavy rain near the Seto Inland Sea caused a decrease in water temperature on the eastern coast of the Bungo Channel. The heavy rain intensified vertical mixing of cold water from the Pacific Ocean in the bottom layer, leading to increased gravitational circulation and inflow from the Pacific Ocean in the bottom layer, as well as an increase in dissolved inorganic nitrogen flux to the Bungo Channel.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Afonso Goncalves Neto, Joseph A. Langan, Jaime B. Palter
Summary: Research indicates a northward shift of the Gulf Stream towards the Tail of the Grand Banks on the Northwest Atlantic Shelf in 2008, disrupting the connectivity of the Labrador Current and potentially contributing to abrupt warming and an ecosystem shift a year later. Historical observations suggest similar events may have occurred in the 1970s.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)
Article
Geosciences, Multidisciplinary
Xueming Zhu, Ziqing Zu, Shihe Ren, Miaoyin Zhang, Yunfei Zhang, Hui Wang, Ang Li
Summary: This study presents comprehensive updates to the South China Sea Operational Oceanography Forecasting System (SCSOFS), improving the physical model and data assimilation scheme. Notable updates include the sea surface atmospheric forcing method, the discrete tracer advection scheme, and a modification to the data assimilation scheme. Comparisons show remarkable improvements in the forecasting skill of SCSOFSv2 compared to the original version (SCSOFSv1).
GEOSCIENTIFIC MODEL DEVELOPMENT
(2022)
Article
Marine & Freshwater Biology
Salme E. Cook, John C. Warner, Kendra L. Russell
Summary: Salinity intrusion in coastal systems is controlled by freshwater inflows, but extreme events like drought and sea level rise can exacerbate salt migration. This study examined the mechanisms controlling the location of the salt front in the Delaware Bay estuary and found that river discharge, tidal motions, and interactions with topographic features and meteorological events all affect the salt front's movement.
ESTUARINE COASTAL AND SHELF SCIENCE
(2023)
Article
Microbiology
Ye Lu, Yongxin Lv, Yu Zhang, Qian Liu, Xuewei Xu, Xiang Xiao, Jun Xu
Summary: Thaumarchaeota play important roles in carbon and nitrogen cycling in the ocean and exhibit depth-related diversification and seasonal changes. This study examined the distribution and transcriptomic activity of Thaumarchaeota ecotypes, revealing three primary ecotypes and their depth-related partitioning and seasonal variability. Nutrient concentrations, chlorophyll alpha, and salinity were identified as primary environmental factors. Transcriptomic analysis showed co-occurring expression patterns of elemental cycling genes in nitrogen, carbon, phosphorus, and sulfur cycles for the different ecotypes.
ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Limnology
Guodong Song, Sumei Liu, Jing Zhang, Zhuoyi Zhu, Guiling Zhang, Hannah K. Marchant, Marcel M. M. Kuypers, Gaute Lavik
Summary: Decreases in bottom water oxygen concentration lead to reductions in sediment oxygen uptake and penetration depth, while denitrification rates increase. Nitrate and ammonium fluxes show complex behavior under hypoxic conditions. Changes in benthic nutrient cycling under hypoxia enhance the retention of nitrogen, exacerbating oxygen deficiency.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Meteorology & Atmospheric Sciences
Xabier Davila, Anna Rubio, Luis Felipe Artigas, Ingrid Puillat, Ivan Manso-Narvarte, Pascal Lazure, Ainhoa Caballero
Summary: Submesoscale oceanic processes play a crucial role in the dynamics of oceans, affecting phytoplankton distribution by transporting various substances and shaping water column structure. The analysis of in situ and remote multidisciplinary data highlighted the significance of hydrodynamic variables, particularly vorticity, in modulating phytoplankton distribution. Generalized additive models (GAMs) were used to examine the impact of environmental factors on spectral group distribution, revealing salinity as a key parameter for total chlorophyll a while vorticity played a significant role at the deep chlorophyll maximum (DCM).
Article
Marine & Freshwater Biology
Hisashi Yokoyama, Takahito Rihei, Ryo Sugimoto
PLANKTON & BENTHOS RESEARCH
(2019)
Article
Environmental Sciences
R. Sugimoto, T. Tsuboi, M. S. Fujita
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Editorial Material
Environmental Sciences
Henrietta Dulai, Isaac R. Santos, Makoto Taniguchi, Ryo Sugimoto, Jun Shoji, Abhijit Mukherjee
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2021)
Article
Limnology
Toshimi Nakajima, Ryo Sugimoto, Takahiro Kusunoki, Katsuhide Yokoyama, Makoto Taniguchi
Summary: The study found that oceanic water is the main source of nutrients for coastal ecosystems along the Sanriku Bay, but land-derived nutrients can also accelerate coastal primary production during certain seasons.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Engineering, Civil
Toshimi Nakajima, Ryo Sugimoto
JOURNAL OF HYDROLOGY
(2022)
Article
Oceanography
Takafumi Kataoka, Ryo Sugimoto, Atsushi Kaneda, Haruyo Yamaguchi, Takahito Rihei, Shinya Yamashita
Summary: This study used high-throughput sequencing to evaluate the seasonal changes in the protistan community composition at four sites in Wakasa Bay, Japan. The results showed that the composition varied seasonally rather than geographically, with Alveolata and Chlorophyta being the predominant groups. The summer-autumn composition was influenced by temperature, while the winter composition was affected by nitrate concentration.
CONTINENTAL SHELF RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Alex Cabral, Ryo Sugimoto, Makoto Taniguchi, Douglas Tait, Toshimi Nakajima, Hisami Honda, Isaac R. Santos
Summary: Submarine groundwater discharge (SGD) is a significant pathway for carbon and nutrient transport to coastal ocean, often surpassing river inputs. This study used radium isotopes to estimate SGD-derived fluxes of carbon and nutrients in a coastal bay in the Japan Sea. Fresh SGD was found to be the main source of carbon and nitrogen to the coastal ocean, while saline SGD dominated ammonium inputs. The study revealed that SGD significantly enhanced primary productivity and modified carbonate biogeochemistry of the coastal ocean.
Article
Limnology
Sebastian Euler, Luke C. Jeffrey, Damien T. Maher, Scott G. Johnston, Ryo Sugimoto, Douglas R. Tait
Summary: Mangroves are important ecosystems that have significant impacts on primary production, carbon sequestration, and greenhouse gas cycles in coastal sediments. Microorganisms, specifically bacteria and archaea, play key roles in these processes. However, there are uncertainties regarding the functional and spatial distributions of microorganisms in mangroves.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Water Resources
Aiko Endo, Makoto Yamada, Kenshi Baba, Yuji Miyashita, Ryo Sugimoto, Akira Ishii, Jun Nishijima, Masahiko Fujii, Takaaki Kato, Hideki Hamamoto, Michinori Kimura, Terukazu Kumazawa, Naoki Masuhara, Hisami Honda
Summary: This study developed a methodology for the nexus approach, integrating interdisciplinary concepts and mixed methods to analyze geothermal hot spring resources in Beppu, Japan. The study focuses on understanding the water-energy-food systems and their impact on policy agenda and human behavior, proposing recommendations based on citizen participatory surveys.
FRONTIERS IN WATER
(2021)
Review
Environmental Sciences
Isaac R. Santos, Xiaogang Chen, Alanna L. Lecher, Audrey H. Sawyer, Nils Moosdorf, Valenti Rodellas, Joseph Tamborski, Hyung-Mi Cho, Natasha Dimova, Ryo Sugimoto, Stefano Bonaglia, Hailong Li, Mithra-Christin Hajati, Ling Li
Summary: Submarine groundwater discharge (SGD) plays a significant role in connecting terrestrial and marine systems by releasing nutrients into coastal waters. SGD-derived nitrogen inputs can alleviate nitrogen limitation in coastal ecosystems. Saline SGD is a widespread source of recycled nutrients to global coastal waters, while fresh SGD acts as a localized point source of new nutrients.
NATURE REVIEWS EARTH & ENVIRONMENT
(2021)
Article
Soil Science
Ryo Sugimoto, Akihide Kasai, Douglas R. Tait, Takahito Rihei, Takeru Hirai, Kazuyoshi Asai, Yuji Tamura, Yoh Yamashita
Summary: Land use features can significantly impact nutrient dynamics in watersheds, with traditional agricultural areas like the GIAHS in Japan exhibiting unique characteristics. This study found that in the Kunisaki Peninsula, forest microbial nitrification was a major source of nitrate, and spatial differences in nutrient concentrations were small. Furthermore, the study showed that traditional agricultural landscapes help mitigate excess nitrogen loading from forests while providing essential phosphorus for coastal production, emphasizing the importance of a forest-river-sea connection system in managing nutrient inputs to coastal waters.
NUTRIENT CYCLING IN AGROECOSYSTEMS
(2021)
Article
Environmental Sciences
Tristan McKenzie, Ceylena Holloway, Henrietta Dulai, James P. Tucker, Ryo Sugimoto, Toshimi Nakajima, Kana Harada, Isaac R. Santos
MARINE POLLUTION BULLETIN
(2020)
Review
Environmental Sciences
Aiko Endo, Makoto Yamada, Yuji Miyashita, Ryo Sugimoto, Akira Ishii, Jun Nishijima, Masahiko Fujii, Takaaki Kato, Hideki Hamamoto, Michinori Kimura, Terukazu Kumazawa, Jiaguo Qi
CURRENT OPINION IN ENVIRONMENTAL SCIENCE & HEALTH
(2020)
Review
Environmental Sciences
Makoto Taniguchi, Henrietta Dulai, Kimberly M. Burnett, Isaac R. Santos, Ryo Sugimoto, Thomas Stieglitz, Guebuem Kim, Nils Moosdorf, William C. Burnett
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2019)
Article
Environmental Sciences
Koji Fujita, Jun Shoji, Ryo Sugimoto, Toshimi Nakajima, Hisami Honda, Masaru Takeuchi, Osamu Tominaga, Makoto Taniguchi
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2019)
Article
Oceanography
Alyssa M. LeClaire, Eric N. Powell, Roger Mann, Kathleen M. Hemeon, Sara M. Pace, Vincent Saba, Hubert du Pontavice, Jillian R. Sower
Summary: Arctica islandica is an important species for recording climate change on the U.S. northeast continental shelf, and its growth rates show synchronous changes with cold and warm climatic periods. This study finds that A. islandica near the Delmarva Peninsula had higher growth rates during cold periods, possibly due to increased food supply in shallower water. The range recession of this species is a long-term process determined by the survivorship of older individuals.
CONTINENTAL SHELF RESEARCH
(2024)