Article
Computer Science, Interdisciplinary Applications
Srinivas Kolluru, Shirishkumar S. Gedam, Arun B. Inamdar
Summary: This study utilized machine learning models to partition the absorption coefficients of different optically active substances in water, providing insights into light interaction with various materials. In model performance evaluation, the Extremely Randomized Trees and bagging method models showed higher scores and shorter computational time compared to existing models.
COMPUTERS & GEOSCIENCES
(2021)
Article
Environmental Sciences
Hongwuyi Zhao, Wenxi Cao, Lin Deng, Jianzu Liao, Kai Zeng, Wendi Zheng, Yuanfang Zhang, Jie Xu, Wen Zhou
Summary: A model was developed to estimate primary production and investigate the impact of dominant phytoplankton groups in the South China Sea. The model showed good generality across marine environments and was more sensitive to changes in photosynthetically active radiation than phytoplankton absorption coefficient. Different dominant phytoplankton groups exhibited varied responses to light, resulting in the model's predictive power being dependent on the photo-physiological state of the dominant phytoplankton.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Muhammad A. K. Purbayanto, Madhurya Chandel, Magdalena Birowska, Andreas Rosenkranz, Agnieszka M. Jastrzebska
Summary: This article discusses the fundamental basis and recent findings in vertical vdW heterostructures composed of MXenes as a primary component and other 2D materials as secondary components. MXenes, with their rich surface chemistry and intriguing optical properties, offer a unique platform for optoelectronics applications. Coupling MXenes with other 2D materials in vdW heterostructures can provide new opportunities for exploring novel physical phenomena in quantum-confined nanostructures and devices.
ADVANCED MATERIALS
(2023)
Article
Engineering, Environmental
Camille Minaudo, Daniel Odermatt, Damien Bouffard, Abolfazl Irani Rahaghi, Sebastien Lavanchy, Alfred Wueest
Summary: This study conducted high-frequency IOP profiling in Lake Geneva and found seasonal variations and systematic diel patterns in the IOPs, which were influenced by phytoplankton metabolism, dissolved oxygen, and wind conditions. The research illustrated the potential of using high-frequency profiles of water optical properties to enhance understanding of carbon cycling in lake ecosystems.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Yuxin Lei, Qiaoling Lin, Sanshui Xiao, Juntao Li, Hanlin Fang
Summary: This work demonstrates the generation of deep defect states in MoTe2 fewlayers via a heating process, enabling light emission in the telecommunication O-band for quantum light emission. Optical measurements reveal localized excitons and strong interaction among defects. Furthermore, the optical emission of defects depends on the thickness of the host materials. These findings offer a new route for tailoring the optical properties of two-dimensional materials in optoelectronic applications.
Article
Limnology
Jongsun Kim, Mark J. Brush, Bongkeun Song, Iris C. Anderson
Summary: Estuarine primary production (PP) is a critical rate process for understanding ecosystem function and response to environmental change, but it can be influenced by various factors such as nutrient management, warming, altered hydrology, and harmful algal blooms. The increase in PP in the York River Estuary is associated with higher water temperature, decreased turbidity, and increased light availability, indicating phytoplankton have become more efficient at converting nutrients into biomass.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Pharmacology & Pharmacy
Toshio Niwa, Shin-ichiro Yokoyama, Mika Mochizuki, Toshihiko Osawa
Summary: A bacterium named 2a1-2b producing hexahydrocurcumin was isolated from human feces, showing over 99% similarity with Enterococcus avium ATCC14025(T) based on 16S ribosomal DNA sequence. The strain 2a1-2b produced optically active 5R-hexahydrocurcumin (>95% enantiomeric excess) from tetrahydrocurcumin but not curcumin, indicating the importance of the intestine in hexahydrocurcumin production.
BIOLOGICAL & PHARMACEUTICAL BULLETIN
(2021)
Article
Ecology
Sudarsana Rao Pandi, Sarat C. Tripathy, S. S. Shaju, N. Anilkumar
Summary: This study evaluated the changes in bio-optical characteristics in the Indian sector of the Southern Ocean during the austral summer of 2011. The results showed that surface Chlorophyll-a and phytoplankton absorption coefficient increased with latitude, while Chlorophyll-a specific phytoplankton absorption decreased, indicating an increase in phytoplankton size with latitude. Additionally, the study found higher quantities of optical active substances at 57.5°E compared to 47°E, except for Polar Front 2.
REGIONAL STUDIES IN MARINE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Philip Hindenberg, Frank Rominger, Carlos Romero-Nieto
Summary: A synthetic protocol replacing carbon atoms with dissymmetric phosphorus atoms in pi-systems led to the creation of new fused phosphapyrene derivatives with improved properties. These phosphapyrenes exhibited strong intermolecular interactions in the solid state, high quantum yields photoluminescence in the visible region, and the ability to control the 3D arrangement of molecules. These findings suggest the potential for constructing higher-order, chiral 3D architectures from larger phosphorus-containing pi-systems.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
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
Biodiversity Conservation
Lin Deng, Wen Zhou, Jie Xu, Wenxi Cao, Jianzu Liao, Jun Zhao
Summary: This study estimated the size-fractionated phytoplankton primary production (PP) in the Northern South China Sea (NSCS) using hyperspectral absorption and irradiance data. The estimated results showed good agreement with in-situ measurements. The derived PP profiles exhibited different spatial distribution patterns in coastal and open ocean areas.
ECOLOGICAL INDICATORS
(2022)
Article
Environmental Sciences
Shun Bi, Martin Hieronymi, Ruediger Roettgers
Summary: The color of natural waters is determined by the absorption and scattering properties of dissolved and particulate water constituents. A bio-geo-optical model is introduced to better understand these optical properties and their impact on ocean color. This model provides a more accurate representation of the relationship between bio-geo-optical properties and can capture optical variability across different water types. It reduces uncertainties in ocean color remote sensing and provides a valuable tool for predicting the optical properties of natural waters.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Geography, Physical
Arjun Adhikari, Harilal B. Menon, Aneesh Lotliker
Summary: This study examines the relationship between bio-optical variability and seasonally changing hydrography in a shallow coastal ecosystem. Data collected over ten years reveal the different optical properties and constituents under various hydrographic conditions across different sampling stations. The findings contribute to understanding the optical behavior for ecological health assessment using remote sensing.
ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING
(2023)
Article
Environmental Sciences
Gracia Villalobos, G. N. Williams, N. G. Glembocki, J. P. Pisoni, A. C. Nocera, A. Ferrando
Summary: This study quantifies the influence of phytoplankton community on the light absorption budget in the coastal waters of the North region of the San Jorge Gulf in Argentinian Patagonia. Phytoplankton plays a significant role in the total absorption, with a contribution of 50 % at 443 nm wavelength.
MARINE POLLUTION BULLETIN
(2023)
Article
Chemistry, Physical
Haim Grebel
Summary: The study investigates the optical and thermal effects of sub-micrometer SiC particles embedded in active carbon electrodes. Using Charge-Discharge experiments, it is found that the relative optically related capacitance increase can be significant. The research also shows that optical effects and thermal effects have different impacts on capacitance changes.
Article
Engineering, Environmental
Horacio E. Zagarese, Maria de los Angeles Gonzalez Sagrario, Dieter Wolf-Gladrow, Peeter Noges, Tiina Noges, Kulli Kangur, Shin-Ichiro S. Matsuzaki, Ayato Kohzu, Michael J. Vanni, Deniz Ozkundakci, Santiago A. Echaniz, Alicia Vignatti, Fabian Grosman, Pablo Sanzano, Bryce Van Dam, Lesley B. Knoll
Summary: The study found that CO2 undersaturation occurs more frequently in agriculturally impacted lakes, especially at high irradiance levels and shallow water areas. Analysis using Generalized Additive Models revealed that high irradiance levels and high chlorophyll a concentrations are associated with CO2 depletion. The study also provided the first evidence of whole-lake carbon limitation of phytoplankton biomass.
Article
Environmental Sciences
Katrin Saar, Peeter Noges, Martin Sondergaard, Maria Jensen, Charlotte Jorgensen, Kasper Reitzel, Erik Jeppesen, Torben L. Lauridsen, Henning S. Jensen
Summary: This study investigated the characteristics of bottom sediments in lake mesocosms and the effects of nutrient loading, temperature increase, and vegetation type on phosphorus concentration and vertical distribution. The results showed that higher nutrient loading led to increased sediment accumulation and higher concentration of total phosphorus. The interaction effect between nutrient and temperature treatments was significant, indicating that eutrophication makes shallow lake ecosystems more susceptible to climate change. Additionally, the dominant vegetation type played a role in early phosphorus diagenesis.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Fabien Cremona, Burak Oglu, Mark J. McCarthy, Silvia E. Newell, Peeter Noges, Tiina Noges
Summary: The study aimed to predict cyanobacteria biomass and nitrate concentrations in Lake Vortsjarv, Estonia. A model chain combining a mechanistic model and an empirical, generalized linear model was used to achieve this. The models successfully predicted the variations in cyanobacteria biomass and nitrate concentrations, providing results for different scenarios. The findings underscore the significance of reducing anthropogenic pressures on lake catchments to mitigate the proliferation of harmful pollutants and microalgae.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Ecology
Margot Sepp, Toomas Koiv, Peeter Noges, Tiina Noges, Silvia E. Newell, Mark J. McCarthy
Summary: The geological, hydrological, land-cover, and soil characteristics of catchments have a significant impact on the levels of dissolved organic matter (DOM), total organic nitrogen (TON), and total phosphorus (TP) in lakes. Soil cover in catchments is the best predictor of DOM, TON, and TP levels in lakes, with different soil organic carbon content playing a role in their variability. Bogs and peat soils are major sources of DOM in temperate lakes, while urban areas contribute to higher TP concentrations. Understanding the influence of catchment characteristics on DOM, TON, and TP is crucial for predicting future levels under changing climate and land use.
FRESHWATER SCIENCE
(2022)
Article
Limnology
Upendra Bhele, Burak Oglu, Tonu Feldmann, Priit Bernotas, Helen Agasild, Priit Zingel, Peeter Noges, Tiina Noges, Fabien Cremona
Summary: This study used an ecosystem model to analyze the trophic network and interactions between functional groups in Lake Vortsjarv, Estonia. The results highlighted the importance of macrozoobenthos for maintaining the balance of the food web and showed a positive relationship between the biomass of small phytoplankton and fish, suggesting a prevalence of bottom-up trophic processes.
Article
Environmental Sciences
Olga Tammeorg, Lea Tuvikene, Sergey Kondratyev, Sergey Golosov, Ilya Zverev, Olga Zadonskaya, Peeter Noges
Summary: This study explores the possibility of combining Estonian and Russian monitoring data to assess the water quality of Lake Peipsi. The findings suggest good compatibility between the data from the two countries and highlight the sensitivity of water quality assessment results to sampling frequency. It is recommended to use data from the entire ice-free period for a comprehensive water quality assessment.
JOURNAL OF GREAT LAKES RESEARCH
(2022)
Article
Multidisciplinary Sciences
Chun-Wei Chang, Takeshi Miki, Hao Ye, Sami Souissi, Rita Adrian, Orlane Anneville, Helen Agasild, Syuhei Ban, Yaron Be'eri-Shlevin, Yin-Ru Chiang, Heidrun Feuchtmayr, Gideon Gal, Satoshi Ichise, Maiko Kagami, Michio Kumagai, Xin Liu, Shin-Ichiro S. Matsuzaki, Marina M. Manca, Peeter Noges, Roberta Piscia, Michela Rogora, Fuh-Kwo Shiah, Stephen J. Thackeray, Claire E. Widdicombe, Jiunn-Tzong Wu, Tamar Zohary, Chih-hao Hsieh
Summary: Understanding the causal links and feedbacks among biodiversity, ecosystem functioning, and environmental factors is challenging due to their complex interactions. Through empirical dynamic modeling, this study reveals macroecological patterns and varying feedback strengths in aquatic ecosystems. The findings highlight the importance of considering networks in future ecosystem management.
NATURE COMMUNICATIONS
(2022)
Article
Environmental Sciences
Tuuli Soomets, Kaire Toming, Jekaterina Jefimova, Andres Jaanus, Arno Pollumae, Tiit Kutser
Summary: This study used remote sensing data to estimate nutrient concentrations in Estonian marine waters, with a focus on total nitrogen. The results showed that remote sensing could be a reliable method for monitoring nutrient loads and understanding regional water quality in marine ecosystems.
Article
Environmental Sciences
Olga Tammeorg, Gertrud K. Nurnberg, Ilmar Tonno, Anu Kisand, Lea Tuvikene, Tiina Noges, Peeter Noges
Summary: This study investigated the sediment phosphorus (P) mobility in Vortsjarv, a large shallow lake in Estonia, using sorption experiments and long-term monitoring data. The results showed that labile P and iron bound P were the major forms supplying internal P load in the sediments. Internal P load was correlated with the active area and bottom shear stress in summer. The findings suggest that controlling external P loading can effectively manage internal P loading in large lakes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Olga Tammeorg, Gertrud K. Nuernberg, Peeter Noges, Juha Niemistoe
Summary: This study investigated the factors influencing phosphorus release in Finnish lakes and found that organic substances can inhibit phosphorus release rates. Analysis of a larger dataset of northern lakes confirmed the negative effect of organic substances and identified sediment total phosphorus and organic matter content as the best predictors of release rate.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Eva-Ingrid Room, Velda Lauringson, Alo Laas, Kersti Kangro, Malle Viik, Pille Meinson, Fabien Cremona, Peeter Noges, Tiina Noges
Summary: Lakes play an important role in regulating greenhouse gases, and Estonian lakes are net sinks of both CO2 and CH4 in late summer. Alkaline lakes are the only source of N2O emissions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Correction
Multidisciplinary Sciences
Chun-Wei Chang, Takeshi Miki, Hao Ye, Sami Souissi, Rita Adrian, Orlane Anneville, Helen Agasild, Syuhei Ban, Yaron Be'eri-Shlevin, Yin-Ru Chiang, Heidrun Feuchtmayr, Gideon Gal, Satoshi Ichise, Maiko Kagami, Michio Kumagai, Xin Liu, Shin-Ichiro S. Matsuzaki, Marina M. Manca, Peeter Noges, Roberta Piscia, Michela Rogora, Fuh-Kwo Shiah, Stephen J. Thackeray, Claire E. Widdicombe, Jiunn-Tzong Wu, Tamar Zohary, Chih-hao Hsieh
NATURE COMMUNICATIONS
(2022)
Article
Water Resources
Tiina Noges, Sirje Vilbaste, Mark J. McCarthy, Marju Tamm, Peeter Noges
Summary: This study analysed long-term changes in fertiliser use, wastewater treatment, and river water nutrient status in Estonia. The findings indicated that reductions in point source nutrient loading contributed to the decline in riverine nitrogen and phosphorus concentrations. However, the increased use of mineral fertilisers hindered efforts to meet water quality and nutrient load targets set by the EU directives.
HYDROLOGY RESEARCH
(2022)
Article
Environmental Sciences
Tuuli Soomets, Kaire Toming, Birgot Paavel, Tiit Kutser
Summary: The Baltic Sea is a complex study object for watercolor remote sensing, and most remote sensing products fail to produce reliable results. Among the tested products, the best performing remote sensing Chl-alpha product is Case(2)/ Regional CoastColour produced from Sentinel-3 OLCI reflectance.
JOURNAL OF APPLIED REMOTE SENSING
(2022)
Article
Biodiversity Conservation
Anna Kuparinen, Silva Uusi-Heikkila, Tommi Perala, Fabio Ercoli, Antti P. P. Eloranta, Fabien Cremona, Peeter Noges, Alo Laas, Tiina Noges
Summary: Invasive species pose a threat to native populations and the structure of food webs. Using an ecological network model, we predict the impact of Amur sleeper invasion on a lake ecosystem. The establishment of Amur sleeper leads to a decrease in biomass of top predator fishes.
CONSERVATION SCIENCE AND PRACTICE
(2023)