Article
Multidisciplinary Sciences
Olivier Cartapanis, Lukas Jonkers, Paola Moffa-Sanchez, Samuel L. Jaccard, Anne de Vernal
Summary: Analysis of a large database of Holocene temperature time series challenges the concept of a globally synchronous Holocene Thermal Maximum. The discrepancies between climate reconstructions and model simulations highlight the need for reevaluation of climate models and proxy temperature records. The heterogeneous response to climate forcing indicates the lack of globally synchronous HTM.
NATURE COMMUNICATIONS
(2022)
Article
Meteorology & Atmospheric Sciences
Fu Zhao, Xi Liang, Zhongxiang Tian, Chengyan Liu, Xichen Li, Yun Yang, Ming Li, Na Liu
Summary: The response of Antarctic sea ice to the long-term trend of local atmospheric forcing shows significant spatial variabilities. The sea ice area and volume decrease in the Weddell Sea and increase in the Ross Sea, while in the Amundsen-Bellingshausen Seas sector, the sea ice area decreases from December to June and increases from July to November, with a decrease in sea ice volume throughout the year. In the Indian-Western Pacific Oceans sector, the sea ice area decreases from January to May and increases from June to December, with an increase in sea ice volume throughout the year.
Review
Geosciences, Multidisciplinary
Zoltan Kern, Aurel Persoiu
Summary: Over 141 million meters of ice cores have been extracted from 20 cave ice deposits worldwide, with most drilling projects focusing on caves in Central Europe. However, the publication of non-European cave ice cores in 2020 suggests that there will be an increasing number of drilling projects in other geographical areas with ice caves. The most commonly encountered technical challenge in ice-core drilling in cave environments is the presence of rocky/woody debris. To address the complex stratigraphy of cave ice deposits, we propose the Cave Ice Sedimentary Architecture and Deposition (CISAD) approach, which takes into consideration the peculiarities of the investigated cave ice deposit and additional crucial meta-data to determine the best-suited drilling site for obtaining high-quality paleoenvironmental data.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geography, Physical
Yuesong Gao, Maria Cristina Salvatore, Qibin Xu, Lianjiao Yang, Liguang Sun, Zhouqing Xie, Carlo Baroni
Summary: Due to climate changes, penguins are predicted to be losing their breeding habitats. In this study, researchers investigated the population dynamics and the role of Inexpressible Island as a breeding site for Ade=lie penguins by analyzing penguin remains and guano from abandoned nests. The findings suggest that the island served as an early settlement and refuge for the penguins, and the persistent efficiency of Terra Nova Bay polynya supported the expansion of the population.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Michael M. Sori, Patricio Becerra, Jonathan Bapst, Shane Byrne, Riley A. McGlasson
Summary: By analyzing the climate record in Burroughs Crater, researchers have found evidence that the climate in this region of Mars is influenced by orbital factors, indicating a relationship between ancient Martian climate and orbital changes.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Christo Buizert
Summary: Ice cores provide detailed records of past climate change. The gas age-ice age difference (Delta age) is a powerful proxy for past surface temperature. A new method is developed to estimate past temperatures of the ice sheet surface using changes in ice core Delta age, with some densification models showing insufficient sensitivity to accumulation rates.
GEOPHYSICAL RESEARCH LETTERS
(2021)
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
Meteorology & Atmospheric Sciences
Weiyi Sun, Bin Wang, Qiong Zhang, Deliang Chen, Guonian Lu, Jian Liu
Summary: Understanding the impact of Saharan vegetation changes on the climate of the Middle East is crucial, as it can significantly influence precipitation patterns in the region. The greening of the Sahara leads to increased late winter and early spring precipitation in the Middle East, while a lack of vegetation in the Sahara results in drier conditions in the region.
JOURNAL OF CLIMATE
(2021)
Review
Astronomy & Astrophysics
Linda C. Ivany, Emily J. Judd
Summary: The study of paleoseasonal proxy data can provide insights into the impact of global warming on seasonal extremes and improve estimates of mean annual temperature. The analysis of seasonal data can reveal spatiotemporal climate patterns on the ancient Earth and their response to pCO(2).
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Yuta Kuniyoshi, Ayako Abe-Ouchi, Sam Sherriff-Tadano, Wing-Le Chan, Fuyuki Saito
Summary: Using the climate model MIROC4m, this study simulates self-sustained oscillations of millennial-scale periodicity in the climate and Atlantic meridional overturning circulation under glacial conditions. The mechanism of these oscillations is examined by considering extreme climatic precession and its impact on boreal seasonality and sea ice thickness.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Hao Wang, Kefu Yu, Tao Han, Shendong Xu, Shichen Tao, Shaohua Dang, Xiaopeng Yu
Summary: This study presents eight Porites coral delta C-13 records from the northern South China Sea, showing a long-term decreasing trend in coral delta C-13 seasonality since the mid-late Holocene, consistent with changes in orbital-induced insolation seasonal amplitude. By excluding other factors, the study suggests that the increased coral delta C-13 seasonality during the mid-Holocene is due to metabolic effects. These findings have implications for using coral delta C-13 seasonality as an indicator for past insolation changes under different climatic backgrounds.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Multidisciplinary Sciences
Lonnie G. Thompson, Jeffrey P. Severinghaus, Tandong Yao, Mary E. Davis, Ellen Mosley-Thompson, Emilie Beaudon, M. Roxana Sierra-Hernandez, Stacy E. Porter
Summary: This study uses ice cores from the northwestern Tibetan Plateau to examine climate variability in the region over the past 15,000 years. By dating the ice cores using a combination of methods, the researchers were able to establish a robust chronology and identify climatic variations corresponding to independently dated lake and speleothem records. They also found that delta O-18(ice) values have increased since the mid-20th century, coinciding with regional air temperature rise.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Geosciences, Multidisciplinary
Dingyong Liang, Guoqiang Xu, Fanglei Gao, Ling Wen, Liyun Jia, Li Liu, Dongfeng Jiao, Chaoyun Yang, Shuzhuang Wu
Summary: Identifying the sources of sediments is crucial for reconstructing the Holocene paleoclimate evolution and understanding regional responses to global climate change in the Beibu Gulf. This study investigated the Holocene paleoclimatic history of the eastern Beibu Gulf using chronological, geochemical, and mineralogical analyses of sediments from Core KZK01. The results showed that sediments primarily originated from Hainan Island and its proximal sources, with contributions from Taiwan and the Pearl River. The study also revealed the importance of coastal currents, surface currents, and warm currents in material transport. Furthermore, the illite crystallinity was found to be a valuable proxy indicator for reconstructing surface chemical weathering processes.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Brittany N. Price, Nathan D. Stansell, Alfonso Fernandez, Joseph M. Licciardi, Alia J. Lesnek, Ariel Munoz, Mary K. Sorensen, Edilia Jaque Castillo, Tal Shutkin, Isabella Ciocca, Ianire Galilea
Summary: The development of robust chronologies of Neoglaciation in the high-altitude Andes can provide valuable insights into regional climate variability and aid in predicting future changes. Unfortunately, records of Late Holocene glaciation in the Central Chilean Andes are limited. In this study, we used a combination of dating techniques to establish a chronology of glacier fluctuations and found evidence of coeval climate variability between the middle and high southern latitudes during the Late Holocene.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geography, Physical
Shugui Hou, Wangbin Zhang, Ling Fang, Theo M. Jenk, Shuangye Wu, Hongxi Pang, Margit Schwikowski
Summary: There is controversy regarding the age ranges of Tibetan ice cores, but the bottom ages of two new ice cores suggest that the age range accessible by Tibetan ice cores is constrained to the Holocene.
Article
Environmental Sciences
Ethan D. Coffel, Corey Lesk, Jonathan M. Winter, Erich C. Osterberg, Justin S. Mankin
Summary: Maize and soy production in the US has increased rapidly, reducing crop-damaging high temperatures. Agricultural intensification has created a crop-climate feedback, where increased crop production cools the local climate and benefits crop yields. The increased production of maize and soy has reduced warming effects and boosted crop yields, but a stagnation in production could expose crops to more harmful heat extremes.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Geography, Physical
Asa K. Rennermalm, Regine Hock, Federico Covi, Jing Xiao, Giovanni Corti, Jonathan Kingslake, Sasha Z. Leidman, Clement Miege, Michael Macferrin, Horst Machguth, Erich Osterberg, Takao Kameda, Joseph R. McConnell
Summary: Research shows that the firn density on the Greenland ice sheet has increased in the past few decades, but some areas have experienced a decrease in density after an extreme melt in 2012. This suggests that despite overall melting increases, temporary build-up in firn pore space and meltwater infiltration capacity may still occur in certain regions.
JOURNAL OF GLACIOLOGY
(2022)
Article
Meteorology & Atmospheric Sciences
Pengzhen He, Becky Alexander, Hui Kang, Bei Jiang, Xiawei Yu, Fange Yue, Zhouqing Xie
Summary: This study presents observations of surface sulfate and its Delta O-17 in the Arctic Ocean to estimate sulfate production mechanisms. The results indicate that ozone oxidation has a minor contribution to sulfate production in summer Arctic, while H2O2 oxidation dominates with a possible contribution of 37%-66%. The role of HOBr oxidation is related to its abundance.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Meteorology & Atmospheric Sciences
K. L. Confer, L. Jaegle, G. E. Liston, S. Sharma, V. Nandan, J. Yackel, M. Ewert, H. M. Horowitz
Summary: We studied the effects of changing Arctic sea ice conditions on sea salt aerosols (SSA) generated by oceanic wave-breaking and wind-lofted salty blowing snow on sea ice. We found that the surface mass concentrations of pan-Arctic SSA have increased during both the cold and warm seasons. These changes in SSA concentrations could have significant impacts on bromine explosions and Arctic climate feedbacks.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Environmental Sciences
Ursula A. Jongebloed, Andrew J. Schauer, Shohei Hattori, Jihong Cole-Dai, Carleigh G. Larrick, Sara Salimi, Shana R. Edouard, Lei Geng, Becky Alexander
Summary: This study quantifies the contribution of anthropogenic sulfur emissions to sulfate in a Greenland ice core. Using sulfur isotopes, the researchers were able to separate anthropogenic sulfate from natural sources and observed changes in anthropogenic sulfate concentration over time. These findings are important for evaluating the impact of anthropogenic sulfate aerosols on climate change.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Yuk-Chun Chan, Lyatt Jaegle, Pedro Campuzano-Jost, David C. Catling, Jihong Cole-Dai, Vasile I. Furdui, W. Andrew Jackson, Jose L. Jimenez, Dongwook Kim, Alanna E. Wedum, Becky Alexander
Summary: In this study, a global three-dimensional chemical transport model was used to simulate the production, transport, and deposition of perchlorate in the Earth's atmosphere. The model predictions were compared to observations, and it was found that the model could not fully explain the high levels of perchlorate observed at near-surface sites and the low O-17-excess observed in perchlorate sampled from pristine environments. Four hypotheses were discussed to explain these discrepancies and recommendations were made for further laboratory and field observations.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Meteorology & Atmospheric Sciences
Joseph Robinson, Lyatt Jaegle, Luke D. Oman
Summary: This study examines the distribution of aerosol optical depth (AOD) in midlatitude cyclones in the northern hemisphere from 2005 to 2018 using MODIS retrievals. The results show that AOD is significantly enhanced in the warm conveyor belt (WCB) airstream, with fine mode AOD accounting for the majority of the enhancement. Coarse mode AOD is greatly enhanced near the center of the cyclone, coinciding with high surface wind speeds. The M2GMI simulations reproduce the magnitude and seasonality of the MODIS AOD composites and enhancements, showing the dominance of sulfate and organic aerosols in the WCB.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Editorial Material
Geosciences, Multidisciplinary
Lyatt Jaegle
Summary: Measurements from a yearlong drift in sea ice across the Central Arctic reveal that blowing snow events generate significant amounts of fine sea salt particles, which impact cloud properties and contribute to surface warming.
Article
Geosciences, Multidisciplinary
Aaron Chesler, Dominic Winski, Karl Kreutz, Bess Koffman, Erich Osterberg, David Ferris, Zayta Thundercloud, Joseph Mohan, Jihong Cole-Dai, Mark Wells, Michael Handley, Aaron Putnam, Katherine Anderson, Natalie Harmon
Summary: Knowledge of microarticle geometry is crucial for accurate ice core volume-related dust metrics calculation and paleoclimate interpretations. However, data on particle shape in Antarctica are scarce. This study presents 41 discrete particle shape measurements from the South Pole Ice Core (SPC14) and compares them with Coulter counter measurements and high-resolution laser-based data to assess particle characteristics and variability. The results show that assuming ellipsoidal particle shapes provide a more accurate representation of particle size distributions, reducing flux and mass ratios. The study also found that coarse particles exhibit greater variation in aspect ratios and long-range dust transport is likely dominated by clay and elongated minerals.
CLIMATE OF THE PAST
(2023)
Article
Environmental Sciences
William F. Swanson, Chris D. Holmes, William R. Simpson, Kaitlyn Confer, Louis Marelle, Jennie L. Thomas, Lyatt Jaegle, Becky Alexander, Shuting Zhai, Qianjie Chen, Xuan Wang, Tomas Sherwen
Summary: Reactive halogens, emitted from snowpack and reactions on wind-blown snow-sourced aerosols, play an important role in the atmospheric chemistry of the Arctic during springtime. In this study, Arctic reactive bromine chemistry was simulated using the atmospheric chemical transport model GEOS-Chem, with two mechanisms included: blowing snow sea salt aerosol formation and snowpack bromine production. The simulations were compared to observations of bromine monoxide (BrO) concentrations, and it was found that both mechanisms are active during the Arctic spring, with the snowpack source having a greater impact on BrO mixing ratios.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Yanzhi Cao, Zhuang Jiang, Becky Alexander, Jihong Cole-Dai, Joel Savarino, Joseph Erbland, Lei Geng
Summary: Ice-core nitrate isotopes can reflect column ozone variability, but are more sensitive to snow accumulation rate.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Geography, Physical
Zhuang Jiang, Joel Savarino, Becky Alexander, Joseph Erbland, Jean-Luc Jaffrezo, Lei Geng
Summary: The effect of post-depositional processing on the preservation of snow nitrate isotopes at Summit, Greenland, is investigated, with a focus on the impact on δN-15(NO3-). The study emphasizes the importance of understanding the effects of post-depositional processing before interpreting ice-core nitrate isotopes.
Article
Geosciences, Multidisciplinary
Michael Sigl, Matthew Toohey, Joseph R. McConne, Jihong Cole-Dai, Mirko Severi
Summary: The injection of sulfur into the stratosphere by volcanic eruptions is the dominant driver of natural climate variability. A new database, HolVol v.1.0, provides estimates of volcanic sulfur injection events for the Holocene, extending the record by 7000 years. The reconstructions reveal a higher number of volcanic eruptions and sulfur injection during the Early Holocene, coinciding with rapid ice sheet retreat. These findings are important for understanding future volcanic activity.
EARTH SYSTEM SCIENCE DATA
(2022)
Article
Environmental Sciences
Ruochong Xu, Joel A. Thornton, Ben H. Lee, Yanxu Zhang, Lyatt Jaegle, Felipe D. Lopez-Hilfiker, Pekka Rantala, Tuukka Petaja
Summary: We evaluated the fate of monoterpene-derived peroxy radicals (MT-RO2) in the atmosphere, focusing on their unimolecular autoxidation and reactions with other species. The results show that these reactions have significant implications for atmospheric chemistry and aerosol concentration, highlighting the need for further investigation into the kinetics of HOM and RO2 accretion product formation derived from MT-RO2.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)