Article
Geosciences, Multidisciplinary
Muthusamy Ravichandran, Anil K. Gupta, Kuppusamy Mohan, Chokkalingam Lakshumanan
Summary: The study examines monsoon wind variability in the Arabian Sea using planktic foraminifera and mixed-layer species from cores in the northeastern region. Results show significant fluctuations in upwelling intensity and productivity linked to monsoon wind strength across the Arabian Sea during the Holocene period. Spectral analysis of foraminifera reveals cyclical patterns associated with solar variability in the past 11 thousands years in the northeastern Arabian Sea.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Meteorology & Atmospheric Sciences
Alok Kumar Mishra, Aditya Kumar Dubey, Sushant Das
Summary: This study investigated the impact of Arabian Sea warming on winter precipitation and subtropical jet variability over the Indian subcontinent. The results showed that warming in the Arabian Sea increased winter precipitation over most parts of India and strengthened the subtropical jet. Additionally, it was found that Arabian Sea warming increased the duration of cold waves in northern India.
ATMOSPHERIC RESEARCH
(2022)
Article
Multidisciplinary Sciences
Hongrui Zhang, Yongsong Huang, Reto Wijker, Isabel Cacho, Judit Torner, Madeleine Santos, Oliver Kost, Bingbing Wei, Heather Stoll
Summary: The high-resolution paleoclimate records on the Iberian Margin are important for studying abrupt climate events. Previous studies suggested a correlation between surface cooling and water freshening, but recent data indicate that the high concentration of a specific alkenone is not caused by decreased salinity, but by a decrease in sea surface temperature. Additionally, surface freshening does not always trigger cooling during millennial climate changes, sometimes occurring in the middle of cooling events and potentially amplifying temperature decrease.
NATURE COMMUNICATIONS
(2023)
Article
Geosciences, Multidisciplinary
Maria Caezare Mae R. Carino, Alyssa M. Peleo-Alampay, Martin G. Wiesner, Leopoldo P. de Silva, Niko Lahajnar, Christian Betzler, Ibrahim Fikree, Thomas Luedmann
Summary: This study investigates the seasonal changes in planktonic foraminifera fluxes during the Asian Monsoon in the Maldives. The results show that nutrient-rich conditions during the monsoon periods lead to higher planktonic foraminifera fluxes. The dominant species vary with the monsoon direction, with shallow-dwelling species dominating during the NE monsoon and deep-water species dominating during the SW monsoon.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Midhila Varna, Arvind Singh, Deepika Sahoo, Debasis Sengupta
Summary: During the winter months of 1990-2010, observations showed a decreasing trend in sea surface salinity in the southeastern Arabian Sea. This decline was primarily attributed to a 2-3 fold increase in the influx of low-salinity water due to the strengthening of the Northeast Monsoon Current and the West India Coastal Current.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Meteorology & Atmospheric Sciences
P. P. Baburaj, S. Abhilash, C. S. Abhiram Nirmal, A. Sreenath, K. Mohankumar, A. K. Sahai
Summary: This study examines the impact of cyclones in the Arabian Sea on the Indian Summer Monsoon. The analysis shows that these cyclones alter the wind patterns and disturb the thermodynamical and dynamical state of the background monsoon circulation. Additionally, cyclones also affect the distribution of sea surface temperature and precipitation.
ATMOSPHERIC RESEARCH
(2022)
Article
Oceanography
Sravanthi Nukapothula, Ali P. Yunus, Chuqun Chen, Raju Attada, Allu Chinna Narayana
Summary: A major dust storm occurred in the northern Arabian Sea in January 2022, causing a significant decrease in visibility. Using MODIS and satellite reanalysis model data, our study examined the potential consequences and processes of this dust storm event, as well as its impact on sea surface temperature variability. We observed a substantial increase in dust mass concentrations (88%) during the event date compared to normal days, followed by an intense cooling (6.7 degrees C) in the region. Furthermore, there was an increase in latent heat flux concentrations (476 wm 2) and aerosol optical depth (1.4) over the northern Arabian Sea.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2023)
Article
Multidisciplinary Sciences
Yiping Yang, Lanlan Zhang, Liang Yi, Fuchang Zhong, Zhengyao Lu, Sui Wan, Yan Du, Rong Xiang
Summary: Despite extensive studies in Africa, South America, and Indonesia, the response of tropical hydroclimate to North Atlantic cooling events during the Heinrich Stadial 1 (HS1) remains debated. This study investigates the tropical hydroclimate pattern in the Indo-Asian-Australian monsoon region during the HS1 by integrating hydroclimatic records and analyzing a delta O-18(seawater) record. The findings show that the tropical hydrological conditions were arid in both hemispheres during the early HS1, except for a narrow, wet belt in northern low latitudes.
NATURE COMMUNICATIONS
(2023)
Article
Geography, Physical
Sonu Jaglan, Anil K. Gupta, Steven C. Clemens, Som Dutt, Hai Cheng, Raj K. Singh
Summary: The study suggests that solar activity is a key driving factor for rapid changes in the Indian summer monsoon, with monsoonal shifts influenced by changes in solar insolation and precession harmonics. The new δO-18 time series indicates high-amplitude shifts in the Indian summer monsoon during marine isotope stage 3, similar to oscillations recorded in high northern latitudes.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Meteorology & Atmospheric Sciences
Vittal Hari, Amey Pathak, Akash Koppa
Summary: South Asian monsoon variability is influenced by changes in the south Atlantic Ocean sea surface temperature. This leads to increased Arabian Sea cyclones, reduced moisture transport to the Indian landmass, and ultimately weaker monsoon strength. These responses are exacerbated by greenhouse gas emissions, highlighting the significant role of anthropogenic warming.
Article
Environmental Sciences
Dharmendra Pratap Singh, Rajeev Saraswat, Rahul Pawar
Summary: This study examines the morphology of benthic foraminifera and its relationship with ambient environmental parameters in the southeastern Arabian Sea. The results show that different environmental conditions lead to variations in the morphology of benthic foraminifera, and they can be used as indicators for reconstructing paleoenvironments.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Meteorology & Atmospheric Sciences
Sanjeev Dwivedi, Viswanadhapalli Yesubabu, M. Venkat Ratnam, Hari Prasad Dasari, Sabique Langodan, S. T. Akhil Raj, Ibrahim Hoteit
Summary: This study investigates the spatial and temporal variability of the monsoon inversion (MI) over the Arabian Sea using reanalysis data and downscaled simulations. The analysis reveals the role of radiative cooling and boundary layer jets, as well as the slight overestimation of winds leading to increased wind shear. Moreover, a decreasing trend in lower tropospheric wind speed during the summer monsoon over the western Arabian Sea is observed.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2021)
Article
Geochemistry & Geophysics
Michael B. Adebayo, Clara T. Bolton, Ross Marchant, Franck Bassinot, Sandrine Conrod, Thibault de Garidel-Thoron
Summary: This study used a tropical Indian Ocean core-top data set to test the Optimum size-hypothesis and investigate the relationships between planktonic foraminiferal size and environmental parameters. Results showed that most planktonic foraminifera species have unimodal size frequency distributions, with some larger species showing multimodal distributions. The study also revealed that relative abundance is not a good predictor of species' optima and within-species size response to environmental parameters is species-specific, with carbonate ion concentration, temperature, and salinity being primary drivers.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Oceanography
Vivek Seelanki, Tanuja Nigam, Vimlesh Pant
Summary: The primary productivity in the Northern Arabian Sea is controlled by the seasonal variation of surface winds. Positive Indian Ocean Dipole events lead to increased Chlorophyll-a concentration in the winter, while the co-occurrence of El Niño and positive IOD events result in decreased concentration. Weaker winter convective mixing is observed during CEPIOD events compared to PPIOD events, which can be explained by the presence of weaker northeasterly winds and a lower net heat flux loss. Higher convective mixing promotes stronger winter bloom and supports primary productivity in PPIOD years.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2022)
Article
Meteorology & Atmospheric Sciences
Shreyas Dhavale, Milind Mujumdar, Mathew Koll Roxy, Vineet Kumar Singh
Summary: Monsoon conditions in the Arabian Sea are generally unfavorable for cyclone formation, but cyclones can still form during the onset phase of the Indian summer monsoon. The study shows that a weakened monsoonal wind circulation caused by the southward intrusion of subtropical westerlies is conducive for cyclone formation in the Arabian Sea during the monsoon onset phase.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2022)
Article
Geography, Physical
Huyue Song, Shixue Hu, Michael Benton, Dayong Jiang
Summary: This article examines the end Permian to Middle Triassic interval, which witnessed a significant marine mass extinction and delayed recovery. The focus is on Triassic marine sediments in South China, providing unique documentation of the collapse and recovery of marine ecosystems. Several papers analyze different fossils and their ecological significance, while others study biostratigraphy, reconstruct paleoenvironments, and link records to volcanic eruptions.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Mohammad Firoze Quamar, Upasana Swaroop Banerji, Biswajeet Thakur, Ratan Kar
Summary: The Indian Summer Monsoon is a crucial component of the Asian Monsoon System, impacting rainfall, agricultural productivity, and socio-economic growth in India and nearby regions. The central monsoon zone in India is more responsive to strong monsoon phases than weak ones.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Maria Laura Balestrieri, Valerio Olivetti, David Chew, Luca Zurli, Massimiliano Zattin, Foteini Drakou, Gianluca Cornamusini, Matteo Perotti
Summary: This study presents a multidisciplinary provenance study on legacy cores drilled in the central Ross Sea, Antarctica, providing insights into the oscillation of ice flows and advance and retreat phases of the West Antarctic Ice Sheet.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
P. Depuydt, S. Toucanne, C. Barras, S. Le Houedec, M. Mojtahid
Summary: This study provides a comprehensive overview of the dynamics of the upper branch of the Atlantic Meridional Overturning Circulation (AMOC) in the mid-latitudes of the Northeast Atlantic. It focuses on the European Slope Current (ESC) and its glacial equivalent known as the Glacial Eastern Boundary Current (GEBC). The study reveals significant changes in flow strength and ventilation during the glacial and deglaciation periods, as well as a gradual weakening of the slope current during the Holocene.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Junhee Park, Holly J. Stein, Judith L. Hannah, Svetoslav V. Georgiev, Oyvind Hammer, Snorre Olaussen
Summary: This study reports new Re-Os ages for black shales from Svalbard and evaluates the paleoenvironment during organic-rich shale deposition. The study also proposes correlations of specific Late Jurassic ammonite zones between the Boreal and Tethyan realms.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Guocheng Dong, Weijian Zhou, Feng Xian, Yunchong Fu, Li Zhang, Ling Tang, Pengkai Ding
Summary: The cause of ice-age cycles is still not fully understood, and studying the timing and magnitude of mountain glaciations can provide valuable insights. This study presents new dating results from the Niqingqu Valley in the Tibetan Plateau, showing multiple glacial activities prior to the Penultimate Glacial Maximum. The findings suggest that low atmospheric CO2 content and reduced summer solar insolation/high summer-monsoon precipitation played a role in these glacial fluctuations.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Haoran Dong, Zhitong Chen, Yucheng Wang, Jie Chen, Zhiping Zhang, Zhongwei Shen, Xinwei Yan, Jianbao Liu
Summary: Through sediment records from Lake Nanyi in the lower Yangtze, we found that anthropogenic fire activity played a dominant role in the region, and the temporal pattern of fire activity was asynchronous from east to west. Archaeological evidence suggests an inverse relationship between agricultural and population levels and fire intensity during the mid-Holocene, with fire intensity being influenced by the diversity of landscape types associated with pre-historic subsistence patterns. Overall, changes in regional water-level delayed the transition from hunting-gathering to agriculture in the lower Yangtze region.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Giovanni Coletti, Giulia Bosio, Alberto Collareta, Or Mordecai Bialik, Eleonora Regattieri, Irene Cornacchia, Gianni Insacco, John Buckeridge
Summary: This paper argues that sessile barnacles are an excellent proxy for palaeoenvironmental reconstructions. The shells of barnacles consist of diagenetically stable low-magnesium calcite and record short-term variations. Analyses of several Western Mediterranean barnacle-rich deposits demonstrate the utility of barnacles as proxies for water depth, distance from the coastline, and hydrodynamic conditions. Moreover, the stable isotope ratios of barnacle shells can provide detailed palaeoenvironmental information.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Feng Wu, Xinong Xie, Wen Yan, Youhua Zhu, Beichen Chen, Jianuo Chen, Mo Zhou
Summary: This paper describes the Quaternary evolution of Meiji Atoll in the southern South China Sea. The findings show how variations in sea surface temperature, eustatic sea level, and tectonics have influenced the development of the atoll. These findings have broader implications for understanding the Quaternary evolution of similar tropical carbonate atolls in the region.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Ana Mateos, Ericson Hoelzchen, Jesus Rodriguez
Summary: The Epivillafranchian and the transition to the Galerian was a period of environmental fluctuations and faunal turnover. Hominins and giant hyenas could coexist during the Epivillafranchian, but the transition to the Galerian led to a disruption of the scavenging niche, coinciding with the extinction of P. brevirostris.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Tianyu Du, Wensheng Zhang, Bing Li, Linjing Liu, Yuecong Li, Yawen Ge, Shiyong Yu
Summary: This article presents sedimentary evidence for a dramatic channel displacement of the lower Yellow River about 3000-2600 years ago, and explains the impact of this displacement on the geomorphology and human migration.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Johann Mueller, Michael M. Joachimski, Oliver Lehnert, Peep Mannik, Yadong Sun
Summary: The Late Ordovician mass extinction occurred during an ice age, with maximum ice coverage and a substantial drop in global sea level. This led to the exposure or shallowing of shallow tropical shelf environments. The study suggests that the burial rate of nutrient phosphorus (P) on shelves was minimal during this glacial period, leading to excess bioavailable P entering the open ocean and stimulating phytoplankton production, which in turn lowered oxygen concentrations.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Marina Addante, Patrizia Maiorano, Giovanna Scopelliti, Angela Girone, Maria Marino, Samanta Trotta, Antonio Caruso
Summary: This study presents the first high-resolution results on planktonic foraminiferal stable oxygen isotopes and calcareous plankton assemblages, providing insights into the glacial-interglacial variability and North Atlantic climate variability. The research also reveals evidence of the first significant southward migration of the Subarctic Front in the mid-latitudes.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Bing-Cai Liu, Rui-Wen Zong, Kai Wang, Jiao Bai, Yi Wang, Hong-He Xu
Summary: Phytogeography plays a vital role in the evolution of plants. This paper describes a new species of a spore-bearing plant from the upper Silurian period in West Junggar, China. By analyzing global Silurian macrofossil records, the study reveals the spatial-temporal distribution of Silurian plant macrofossils and identifies two phytogeographic realms during the Pridoli Epoch.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Francois Fournier, Thomas Teillet, Alexis Licht, Jean Borgomano, Lucien Montaggioni
Summary: This study investigates the temporal evolution of neritic carbonates in the proto-South China Sea to reconstruct East Asian monsoonal currents and winds during the middle to late Paleogene. The results highlight that many of the features of the summer East Asian Monsoon large-scale circulation are rooted in the middle Paleogene.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)