Article
Environmental Sciences
Katerina Kouli, Maria V. Triantaphyllou, Olga Koukousioura, Margarita D. Dimiza, Constantine Parinos, Ioannis P. Panagiotopoulos, Theodora Tsourou, Alexandra Gogou, Nikolaos Mavrommatis, George Syrides, Styliani Kyrikou, Elisavet Skampa, Ester Skylaki, Christos Anagnostou, Aristomenis P. Karageorgis
Summary: Coastal landscapes are sensitive to changes due to surface and submarine geological processes, climate variability, and relative sea level fluctuations. The multi-proxy investigation of sediment cores from Elefsis Bay revealed the evolution of paleoenvironment and aquatic ecosystems since the Late Glacial period.
Article
Paleontology
Eduardo Premaor, Javier Helenes, Paulo A. Souza, Wolfgang Kalkreuth
Summary: The study found that dinoflagellate cysts assigned to the subfamily Protoperidinioideae are abundant in Miocene coastal deposits in southern Brazil, with a high richness of this subfamily. The analysis of 49 taxa identified in 18 samples indicates a middle Miocene age for these samples.
MARINE MICROPALEONTOLOGY
(2021)
Article
Geography, Physical
Jimin Sun, Morteza Sheykh, Nahid Ahmadi, Mengmeng Cao, Zhiliang Zhang, Shengchen Tian, Jingeng Sha, Zhimin Jian, Brian F. Windley, Morteza Talebian
Summary: The closure of the Tethyan Seaway in the Miocene influenced global climatic changes, and the Northwest segment closed permanently around 12.8 million years ago. Global climatic change controlled marine transgressions and regressions in the region through its impact on ice sheets and sea level changes. Analyses of the sedimentary sequences suggest that Earth's eccentricity cycles controlled the marine fluctuations between 15.0 and 12.8 million years ago.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geography, Physical
Jin-Si Over, Vera Pospelova
Summary: The first high resolution record of dinoflagellate cysts in the Santa Barbara Basin provides insights into the complex paleoceanographic history. The study reveals changes in cyst abundance, concentration, and diversity, indicating climatic and ocean circulation variations. In addition, the study uses the assemblages to reconstruct sea surface temperature and primary productivity. The findings contribute to our understanding of the basin's paleoceanographic history and its importance in past climatic changes.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Environmental Sciences
Zhaohui Wang, Yuning Zhang, Mingdan Lei, Shuanghui Ji, Jiazhuo Chen, Hu Zheng, Yali Tang, Ren Hu
Summary: This study investigated dinoflagellate cysts in surface sediments from three sea areas of the Qingdao coast and analyzed the relationship between biogenic elements and cysts. The results showed that autotrophic dinoflagellate cysts dominated in the sediments, and 17 harmful algal bloom cysts were identified. The study suggests a potential risk of harmful algal blooms in the Qingdao coastal area.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Zin-Maung-Maung-Thei, Masanaru Takai, Yuichiro Nishioka, Jonathan Wynn, Hikaru Uno, Thaung-Htike, Naoko Egi, Takehisa Tsubamoto, Maung-Maung
Summary: The study suggests that the paleoenvironment of central Myanmar did not significantly change from the late Miocene to early Pleistocene, serving as a refuge for forest/woodland dwellers. The development of drainage systems in late Neogene Myanmar likely buffered against the rain shadow effect of the IndoMyanmar Ranges. The current aridification in central Myanmar is likely related to Middle to Late Pleistocene sea-level changes in the SE Asian region.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Environmental Sciences
Xiaohan Liu, Yuyang Liu, Zhaoyang Chai, Zhangxi Hu, Ying Zhong Tang
Summary: This study investigated dinoflagellate cysts in the Yellow Sea of China using metabarcoding sequencing and single-cyst morpho-molecular identification. It identified many new cyst species and found a significant controlling effect of the Yellow Sea Cold Water Mass on cyst composition. The findings provide important insights into the risks and ecology of dinoflagellate harmful algal blooms (HABs).
MARINE POLLUTION BULLETIN
(2023)
Article
Environmental Sciences
Karin A. F. Zonneveld, Hendrik Grotheer, Gerard J. M. Versteegh
Summary: The study reveals the production and transport of dinoflagellate cysts in the ocean during active upwelling, highlighting their geographical and ecological significance, as well as their potential impact on marine ecosystems and environmental protection.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geochemistry & Geophysics
Yongsong Huang, Yinsui Zheng, Patrick Heng, Liviu Giosan, Marco J. L. Coolen
Summary: This study reconstructs the detailed salinity changes in the Black Sea over the past 16,000 years using alkenones from phylogenetically classified haptophyte groups. The Black Sea surface salinity gradually increased from near fresh to oligohaline around 16 to 9.4 ka, followed by a period of significantly reduced salinity between 3.5 and 1.6 ka. The research provides important insights into regional hydrological changes and their impact on Neolithic human migrations to Europe.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Plant Sciences
Barrie Dale
Summary: This passage discusses the contributions of two early Scandinavian researchers to the development of fossil dinoflagellate cysts in palynology, as well as their influence on Bill Evitt's breakthrough in the field. The work of the Scandinavian researchers was not widely recognized at the time, but through Evitt's breakthrough, the significance of their research gradually became apparent.
Article
Geography, Physical
Xuejiao Wang, Dangpeng Xi, Emanuela Mattioli, Guannan Wang, Xiaoqiao Wan
Summary: The study of calcareous nannofossil assemblages from sediments in western Tarim Basin reveals that the record of the PETM is associated with a transgression-regression cycle. The sea-level change is indicated by the richness and abundance of calcareous nannofossils, with evidence of a gradual increase in sea level and a subsequent regression. Inter-regional correlations show the highest relative sea level in the middle part of NP9a in the Tianshan Mountain area.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Oceanography
Maciej M. Telesinski, Vera Pospelova, Kenneth Neil Mertens, Malgorzata Kucharska, Marek Zajaczkowski
Summary: Due to the Arctic amplification effect, the Svalbard archipelago is an important area for studying ongoing environmental changes. The most important factor controlling the environment in the region is the Atlantic Water, while factors such as sea-ice cover and tidewater glaciers become increasingly important on a local scale. Two dinocyst species can be considered as indicators of regional winter drift ice. However, the relationship between benthic foraminifera and environmental parameters is more difficult to interpret.
Article
Geography, Physical
F. Pilade, I. Vasiliev, D. Birgel, F. Dela Pierre, M. Natalicchio, A. Mancini, G. Carnevale, R. Gennari
Summary: This study uses alkenone-based proxies and other data to reconstruct surface water temperatures and paleoenvironmental conditions in the Mediterranean basin during the late Miocene to early Pliocene period. The results suggest that the Mediterranean basin gradually returned to marine conditions before the end of the late Miocene, and fully marine conditions were established in the early Pliocene. This highlights the importance of alkenone-based proxies in environmental reconstruction, especially when fossil records of primary producers are limited.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Somayeh Zahedi Dizaji, Gilan Attaran Fariman, Mir Mahdi Zahedi
Summary: Dinoflagellates form a large group of microalgae with various pigments that can vary depending on environmental conditions. Two species studied in this research, Scrippsiella trochoidea and Gyrodinium instriatum, had 10 identified pigment types with varying concentrations in their growth periods. The predominant pigments also differed at different stages of growth.
JOURNAL OF APPLIED PHYCOLOGY
(2021)
Article
Environmental Sciences
Ling Lin, Qiong Wang, Huixian Wu
Summary: The study revealed a wide variety of dinoflagellate cysts in ballast tank sediments, indicating potential risks of harmful species and biodiversity. Ships on short voyages had slightly higher dinoflagellate cyst abundance compared to ships on longer voyages, and sediments from ships with diverse routes showed more variable species compositions. The moisture content of sediments was strongly correlated with total cyst abundance, highlighting the importance of monitoring and preventing the introduction of toxic and harmful dinoflagellate cysts to protect marine biodiversity.
MARINE ENVIRONMENTAL RESEARCH
(2021)
Article
Geochemistry & Geophysics
Henriette M. Kolling, Ruediger Stein, Kirsten Fahl, Henrik Sadatzki, Anne de Vernal, Xiaotong Xiao
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2020)
Article
Environmental Sciences
Allyson Tessin, Christian Marz, Marie-Amelie Blais, Hans-Juergen Brumsack, Jens Matthiessen, Matt O'Regan, Bernhard Schnetger
GLOBAL BIOGEOCHEMICAL CYCLES
(2020)
Article
Multidisciplinary Sciences
Anne de Vernal, Claude Hillaire-Marcel, Cynthia Le Duc, Philippe Roberge, Camille Brice, Jens Matthiessen, Robert F. Spielhagen, Ruediger Stein
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Geosciences, Multidisciplinary
Nicole Syring, Jeremy M. Lloyd, Ruediger Stein, Kirsten Fahl, Dave H. Roberts, Louise Callard, Colm O'Cofaigh
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2020)
Article
Multidisciplinary Sciences
Walter Geibert, Jens Matthiessen, Ingrid Stimac, Jutta Wollenburg, Ruediger Stein
Summary: The study provides evidence for at least two periods in the past when the Arctic Ocean and Nordic seas were covered by an extensive ice shelf and filled with fresh water, causing a widespread absence of thorium-230 in marine sediments. This suggests a revision of sea-level reconstructions may be needed and indicates that large masses of fresh water could be delivered to the North Atlantic Ocean on very short timescales.
Article
Geochemistry & Geophysics
Myriam Kars, Male Koester, Susann Henkel, Rudiger Stein, Florence Schubotz, Xiang Zhao, Stephen A. Bowden, Andrew P. Roberts, Kazuto Kodama
Summary: Diagenesis can significantly alter primary magnetic mineral assemblages, as observed in the sediments drilled at International Ocean Discovery Program Site C0023. Varying conditions over time have led to a complex sequence of magnetic overprints, influenced by factors such as sediment supply, burial temperature, and tectonic fluid circulation.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Letter
Multidisciplinary Sciences
Walter Geibert, Jens Matthiessen, Jutta Wollenburg, Ruediger Stein
Article
Multidisciplinary Sciences
Junjie Wu, Gesine Mollenhauer, Ruediger Stein, Peter Kohler, Jens Hefter, Kirsten Fahl, Hendrik Grotheer, Bingbing Wei, Seung-Il Nam
Summary: This study provides evidence for substantial remobilization of ancient terrestrial carbon in the Canadian Arctic during the deglaciation. Physical erosion of bedrock during glacier retreat has mobilized petrogenic carbon, while coastal erosion during meltwater pulses has remobilized pre-aged carbon from permafrost. These processes have contributed 12 ppm to the rise of CO2 during deglaciation, suggesting a positive climate feedback of ice-sheet retreat and underscoring the impact of cryospheric change on the carbon cycle.
NATURE COMMUNICATIONS
(2022)
Article
Environmental Sciences
Defang You, Ruediger Stein, Kirsten Fahl, Maricel C. Williams, Daniela N. Schmidt, Ian Nicholas McCave, Stephen Barker, Enno Schefuss, Lu Niu, Gerhard Kuhn, Frank Niessen
Summary: According to sediment core biomarker proxy records from the Eirik Drift, freshwater perturbations during the last deglaciation drove abrupt changes in sea surface temperature and sea ice extent. Four millennial-scale meltwater events have been identified between the last 14,000 and 8,200 years, characterized by increased sea ice formation and decreased sea surface temperatures. These events were likely triggered by meltwater pulsing into the Labrador Sea periodically, resulting from collapse of the Laurentide-Greenland Ice Sheets caused by (sub-)surface ocean warming.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Environmental Sciences
Jutta Erika Wollenburg, Jens Matthiessen, Christoph Vogt, Gernot Nehrke, Hendrik Grotheer, Dorothee Wilhelms-Dick, Walter Geibert, Gesine Mollenhauer
Summary: Calcareous foraminifera are important for marine radiocarbon chronologies and paleo-proxies, but their shells can undergo post-mortem alteration, including addition of authigenic calcite, which impacts proxy records. In the Arctic Ocean, authigenic calcite overgrowth on foraminifera has been found to be C-13-enriched and can lead to older apparent radiocarbon ages. This study demonstrates that this C-13-enriched calcite affects a large proportion of planktonic foraminifera in the Arctic Basin, raising concerns about the accuracy of the chronology and stable isotope-based proxy records in this region, with implications for paleoclimate models.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Andre Paul, Stefan Mulitza, Ruediger Stein, Martin Werner
Summary: This study provides a climatology of near-sea-surface temperature anomalies and sea-ice extent during the Last Glacial Maximum mapped on a global 1x1 degree grid, using various proxies and reconstructions. The gridded climatology is useful for understanding LGM climate, calculating global and regional temperature averages, estimating climate sensitivity, and providing boundary conditions for atmospheric circulation models.
CLIMATE OF THE PAST
(2021)
Article
Geosciences, Multidisciplinary
Masa Kageyama, Louise C. Sime, Marie Sicard, Maria-Vittoria Guarino, Anne de Vernal, Ruediger Stein, David Schroeder, Irene Malmierca-Vallet, Ayako Abe-Ouchi, Cecilia Bitz, Pascale Braconnot, Esther C. Brady, Jian Cao, Matthew A. Chamberlain, Danny Feltham, Chuncheng Guo, Allegra N. LeGrande, Gerrit Lohmann, Katrin J. Meissner, Laurie Menviel, Polina Morozova, Kerim H. Nisancioglu, Bette L. Otto-Bliesner, Ryouta O'ishi, Silvana Ramos Buarque, David Salas y Melia, Sam Sherriff-Tadano, Julienne Stroeve, Xiaoxu Shi, Bo Sun, Robert A. Tomas, Evgeny Volodin, Nicholas K. H. Yeung, Qiong Zhang, Zhongshi Zhang, Weipeng Zheng, Tilo Ziehn
Summary: The Last Interglacial period (LIG) is characterized by increased summer insolation at high northern latitudes, leading to significant changes in the terrestrial and marine cryosphere. Analysis of climate models in relation to Arctic sea ice during the LIG shows varying results, with some models underestimating and others overestimating sea ice cover. Differences between models may be attributed to variations in short-wave anomalies, albedo, optical depth of clouds, and ocean circulation changes during the LIG period.
CLIMATE OF THE PAST
(2021)
Article
Environmental Sciences
Junjie Wu, Ruediger Stein, Kirsten Fahl, Nicole Syring, Seung-Il Nam, Jens Hefter, Gesine Mollenhauer, Walter Geibert
COMMUNICATIONS EARTH & ENVIRONMENT
(2020)
