Review
Geochemistry & Geophysics
E. L. McClymont, S. L. Ho, H. L. Ford, I. Bailey, M. A. Berke, C. T. Bolton, S. De Schepper, G. R. Grant, J. Groeneveld, G. N. Inglis, C. Karas, M. O. Patterson, G. E. A. Swann, K. Thirumalai, S. M. White, M. Alonso-Garcia, P. Anand, B. A. A. Hoogakker, K. Littler, B. F. Petrick, B. Risebrobakken, J. T. Abell, A. J. Crocker, F. de Graaf, S. J. Feakins, J. C. Hargreaves, C. L. Jones, M. Markowska, A. S. Ratnayake, C. Stepanek, D. Tangunan
Summary: The Pliocene Epoch was a period of climate change characterized by smaller Northern Hemisphere ice sheets and long-term ice-sheet expansion. The intensification of Northern Hemisphere Glaciation caused asynchronous shifts in climate variability across regions and between climate proxies.
REVIEWS OF GEOPHYSICS
(2023)
Article
Geosciences, Multidisciplinary
Natalia Garcia Chapori, Cecilia Laprida, Daniel Lo Prete, Cristiano M. Chiessi, Christoph Mayr, Roberto A. Violante
Summary: Although our knowledge about the long-term past changes in the circulation of the western South Atlantic is fragmented and sparse, analysis of selected palaeoceanographic records reveals substantial changes in the Brazil-Malvinas Confluence region during the Holocene. The Southern Atlantic Meridional Overturning Circulation strengthened since the Mid-Holocene, while the Atlantic Meridional Overturning Circulation weakened towards the preindustrial times.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Cassandre R. Stirpe, Katherine A. Allen, Elisabeth L. Sikes, Xiaoli Zhou, Yair Rosenthal, Alicia M. Cruz-Uribe, Hanna L. Brooks
Summary: The Mg/Ca ratio of Uvigerina peregrina is commonly used to reconstruct bottom water paleotemperatures, but anomalies at some sites suggest the influence of non-temperature factors. Further research is needed to fully understand these effects and validate paleotemperature reconstructions.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geosciences, Multidisciplinary
Minda Moriah Monteagudo, Jean Lynch-Stieglitz, Thomas M. Marchitto, Matthew W. Schmidt
Summary: This study reveals that the central equatorial Pacific cooled by about 2.0 degrees Celsius during the Last Glacial Maximum, contradicting previous estimates but aligning with climate models. This suggests a larger magnitude of cooling in the tropical region during the LGM, implying a higher equilibrium climate sensitivity.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geography, Physical
Joanna Davies, Anders Moller Mathiasen, Kristiane Kristiansen, Katrine Elnegaard Hansen, Lukas Wacker, Aage Kristian Olsen Alstrup, Ole Lajord Munk, Christof Pearce, Marit-Solveig Seidenkrantz
Summary: The melting of marine terminating glaciers in Northeast Greenland is attributed to warming of Atlantic Water. The retreat of glaciers in the Northeast Greenland Ice Stream (NEGIS) area began at least 12.5 thousand years ago and underwent multiple changes. In the Late Holocene, the flow of Atlantic Water resumed, likely leading to the breakup of perennial sea ice.
QUATERNARY SCIENCE REVIEWS
(2022)
Review
Astronomy & Astrophysics
Yarrow Axford, Anne de Vernal, Erich C. Osterberg
Summary: Higher boreal summer insolation in the early to middle Holocene led to significant warming across the Arctic. Geological data from this warm period show that Greenland experienced summers 3 to 5 degrees C warmer than the mid-twentieth century, with dramatic consequences for glaciers, ice sheets, ocean circulation, and flora and fauna.
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES, VOL 49, 2021
(2021)
Article
Multidisciplinary Sciences
Chi-Hua Wu, Shih-Yu Lee, Pei-Chia Tsai
Summary: Higher eccentricity in the early Holocene strengthened the continental summer monsoons, Pacific anticyclone, and Hadley circulation, especially over the ocean. Eccentricity-induced dry-gets-wetter condition over Africa could be related to the Green Sahara, suggesting a significant impact on monsoonal changes.
SCIENTIFIC REPORTS
(2021)
Article
Environmental Studies
Ulf Buntgen
Summary: Independent evidence from Europe and Asia suggests that tree-ring stable isotopes can provide insights into long-term climate trends that traditional dendroclimatic studies may miss. This article calls for a rethinking of the predictive power of different tree-ring parameters in reconstructing climate variability and highlights the potential of stable isotopes in tree rings to capture environmental variations beyond the segment length of individual samples. It also emphasizes the need for developing new isotopic datasets from different species and regions to supplement the existing tree-ring record.
WILEY INTERDISCIPLINARY REVIEWS-CLIMATE CHANGE
(2022)
Article
Geography, Physical
Janne Repschlaeger, Ning Zhao, Devin Rand, Lorraine Lisiecki, Juan Muglia, Stefan Mulitza, Andreas Schmittner, Olivier Cartapanis, Henning A. Bauch, Ralf Schiebel, Gerald H. Haug
Summary: The study reveals significant changes in deepwater circulation during the last deglaciation in the North Atlantic, transitioning from a salinity-driven to a temperature-driven circulation mode. Different water masses with distinct isotopic signatures suggest active deepwater formation during Heinrich Stadial 1.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Meteorology & Atmospheric Sciences
Xiaoxu Shi, Martin Werner, Qiang Wang, Hu Yang, Gerrit Lohmann
Summary: Numerical simulations provide a comprehensive understanding of climate change mechanisms. Simulations of the mid-Holocene (MH) and the last interglacial (LIG) using two versions of the AWI-ESM Earth system model reveal consistent climate changes compared to the preindustrial era. These include enhanced seasonality in surface temperature, northward shift of the intertropical convergence zone and tropical rain belt, reduction in Arctic sea ice concentration, weakening and northward displacement of the Northern Hemisphere Hadley circulation, westward shift of the Indo-Pacific Walker circulation, and expansion and intensification of Northern Hemisphere summer monsoon rainfall. However, the simulated responses of the Atlantic meridional overturning circulation (AMOC) differ between the two models for both LIG and MH.
JOURNAL OF CLIMATE
(2022)
Article
Geography, Physical
Derek K. Gibson, Jonathan Obrist-Farner, Brooke A. Birkett, Jason H. Curtis, Melissa A. Berke, Peter M. J. Douglas, Prudence M. Rice, Jeremy Maurer
Summary: By analyzing sediment cores from Lake Peten Itza in northern Guatemala, this study investigates the frequency and duration of hydrologic extremes during the Late-Holocene. The findings reveal a trend of increasing aridity in the Maya Lowlands over the past 2000 years, punctuated by several drought events. It is suggested that these dry intervals may have been driven by a common mechanism related to tropical Atlantic sea surface temperatures and the expansion of the North Atlantic Subtropical High pressure system. Additionally, the Little Ice Age witnessed further reduction in precipitation, but regional hydroclimatic coherency was weaker, indicating the influence of other climatic mechanisms.
Article
Geosciences, Multidisciplinary
F. Hodel, C. Feriot, G. Dera, M. De Rafelis, C. Lezin, E. Nardin, D. Rouby, M. Aretz, P. Antonio, M. Buatier, M. Steinmann, F. Lacan, C. Jeandel, V. Chavagnac
Summary: Despite its importance in regulating the Earth's climate, the evolution of high-latitude ocean dynamics remains unclear. A geochemical study of the southwest Pacific Ocean reveals temperature changes and ventilation variations during a specific time interval, providing insights into the paleoceanographic changes in the region.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geology
J. L. Bernal-Wormull, A. Moreno, C. Perez-Mejias, M. Bartolome, A. Aranburu, M. Arriolabengoa, E. Iriarte, I. Cacho, C. Spoetl, R. L. Edwards, H. Cheng
Summary: The study indicates that major disruptions in the North Atlantic circulation during the last deglaciation triggered climate feedbacks that influenced the course of Termination I. By analyzing the stalagmite record from Ostolo cave in the northern Iberian Peninsula, researchers gained important insights into the structure of the last deglaciation in the Northern Hemisphere.
Article
Geography, Physical
N. Melissa M. Medina, Francisco W. Cruz, Amos Winter, Haiwei Zhang, Angela Ampuero, Mathias Vuille, Victor C. Mayta, Marilia C. Campos, Veronica Marcela Ramirez, Giselle Utida, Andres Camilo Zuniga, Hai Cheng
Summary: This study presents new oxygen and carbon isotope records of Venezuelan speleothems collected near the Cariaco Basin, revealing long-term and multi-decadal climate variability in the subtropical region. The findings suggest periodic dry and wet periods during the mid-Holocene, potentially related to increased ice rafting and enhanced monsoon activity in the North Atlantic and South America. During the late Holocene, the region experienced a dry Medieval Climate Anomaly and a wet Little Ice Age. The study provides a reliable proxy for ITCZ behavior and teleconnections with other climate systems.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geology
Armand Hernandez, Mario Cachao, Pedro Sousa, Ricardo M. Trigo, Jurg Luterbacher, Jose M. Vaquero, Maria C. Freitas
Summary: Research using microfossil-based proxy records and modeling simulations to estimate North Atlantic upwelling changes discovered that high-pressure conditions, solar activity, and orbital parameters are related to upwelling variations. These new findings provide insights into pre-Anthropocene upwelling changes and are important for future projections of midlatitude upwelling activity.