Article
Geosciences, Multidisciplinary
Liangqing Cheng, Yougui Song, Yubin Wu, Yonggang Liu, Huifang Liu, Hong Chang, Xiulan Zong, Shugang Kang
Summary: This study analyzed 143 loess OSL ages from Central Asia, finding that dust accumulation during the late Last Glacial Maximum was greater than during the early LGM. The temporal variability of dust accumulation in Central Asia is similar to that of the Chinese Loess Plateau, both following precession. However, in Greenland, dust accumulation was stronger during the early LGM, following obliquity.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Andrea Columbu, Christoph Spoetl, Jens Fohlmeister, Hsun-Ming Hu, Veronica Chiarini, John Hellstrom, Hai Cheng, Chuan-Chou Shen, Jo De Waele
Summary: This study suggests that rainfall variability in the central Mediterranean during the last deglaciation was closely linked to temperatures at high northern latitudes and influenced by strengthened westerly winds. The findings highlight the importance of high-latitude climate changes in causing rainfall variation in the Mediterranean region.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Geography, Physical
Yijiao Fan, Jia Jia, Dunsheng Xia, Yan Liu, Baorong Jiang, Junhuai Yang, Fuyuan Gao, Jianhui Chen
Summary: Knowledge of past changes in the Westerlies is important for understanding the climatic and environmental evolution of Central Asia. We found that during the Last Glacial Maximum, the Westerlies showed spatial pattern changes, with strengthened winds in southern Central Asia and weakened winds in northern Central Asia. This change may have influenced the extension of the East Asian Summer monsoon rain belt into north and northwest China.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geochemistry & Geophysics
Kumari Nisha, Sushant Suresh Naik, Pankaj Kumar, Barnita Banerjee, P. B. Rama Murty
Summary: This study investigates the ventilation changes in deep waters of the northern Indian Ocean over the past 25 kyr BP, and finds that a greater proportion of CO2-rich Antarctic Bottom Water (AABW) was present during the Last Glacial Maximum (LGM) and Heinrich Stadial (HS1). Poor ventilation during the last glaciation indicates that the northern Indian Ocean was part of the glacial carbon pool, while improved ventilation during the Bolling-Allerod (B-A) suggests the inflow of North Atlantic Deep Water (NADW) caused degassing from the northern Indian Ocean. Overall, this study supports the role of the Southern Ocean in modulating atmospheric CO2 variations during the last deglaciation.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
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
Jing Lei, Zhengguo Shi, Xiaoning Xie, Xinzhou Li
Summary: Based on climate model experiments, this study found that the precipitation during the Last Glacial Maximum (LGM) was significantly different from that of the preindustrial period in the terrestrial monsoon regions and arid regions of the Northern Hemisphere. The decrease in sea surface temperature and expansion of the ice sheet were the main contributors to lessening precipitation in the monsoon regions, while the decrease in precipitation in the arid regions can be mainly attributed to ice-sheet-induced albedo and topography changes.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Qiang Wei, Yonggang Liu, Qing Yan, Tandong Yao, Miao Wang, Han Huang, Yongyun Hu
Summary: The growth of glaciers affects the local climate system and can either promote or prohibit further glacier growth. This feedback mechanism has not been included in previous glacier modeling studies of the Tibetan Plateau and its surroundings during the Last Glacial Maximum. However, this study found that when considering the feedback, the simulated volume and area of the glaciers were 20% and 10% less, respectively, compared to a standalone glacier model. The expansion of glaciers also led to changes in spatial patterns, improved model-data comparison, and had significant impacts on the winter surface temperature and precipitation distribution in the region.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
T. Laepple, E. Ziegler, N. Weitzel, R. Hebert, B. Ellerhoff, P. Schoch, B. Martrat, O. Bothe, E. Moreno-Chamarro, M. Chevalier, A. Herbert, K. Rehfeld
Summary: Knowledge of natural climate variability is crucial for assessing future climate trajectories. Discrepancies between model simulations and proxy reconstructions exist at both regional and global scales. These discrepancies are primarily due to deficiencies in climate models. Additionally, regional climate variations may persist for longer timescales than currently simulated. Improving the simulation of natural variability in climate models and refining proxy-based inferences are necessary.
Article
Geosciences, Multidisciplinary
Ming Zhang, Yonggang Liu, Jiang Zhu, Zhuoqun Wang, Zhengyu Liu
Summary: In this study, we investigated the changes in climate and Atlantic Meridional Overturning Circulation (AMOC) during the Last Glacial Maximum if there were no dust. Model simulations showed that the removal of dust resulted in a global cooling and weakening of AMOC. This cooling effect was opposite to that observed during the mid-Holocene and was amplified by a positive feedback between sea ice and AMOC.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Ting Wang, Na Wang, Dabang Jiang
Summary: We investigate changes in the intertropical convergence zone (ITCZ) during the last glacial maximum (LGM) using multiple simulations. Most models show that the LGM ITCZ shifts southward, narrows, and weakens on a global scale. Regionally, the central and eastern Pacific show the largest position and intensity changes, while the Indian Ocean-western Pacific experience the most obvious width changes. The September-October-November and June-July-August seasons contribute the most to the annual ITCZ changes globally and in most regions.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Environmental Sciences
Yu Li, Yuxin Zhang, Wangting Ye, Xinzhong Zhang
Summary: This study systematically assessed the global wet/dry pattern response to cold/warm periods since the Last Glacial Maximum, and evaluated the future global wet/dry patterns based on modern observations, paleoclimate simulations, and records. The results indicate that future wet and dry patterns will vary significantly, and the occurrence of abrupt cold events in the near future may result in some areas becoming wetter.
Article
Geography, Physical
Jia Jia, Niuniu Wang, Zhiyuan Wang, Sisi Wang, Michael Meadows, Leibin Wang, Yijiao Fan, Jianhui Chen
Summary: This study examines the particle size characteristics of a high-resolution last glacial loess record in Tajikistan in order to reconstruct climate dynamics in southern Central Asia. The research finds that dust activity in this region differs from that in northern Central Asia and northern China, with a decline during Heinrich events and an increase during interstadials. The study highlights the importance of considering dust emission and transportation conditions, as well as the underestimated role of reactivated paleo-dust, in determining regional dust activity.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geography, Physical
Sarah Kamleitner, Susan Ivy-Ochs, Lucia Manatschal, Naki Akcar, Marcus Christl, Christof Vockenhuber, Irka Hajdas, Hans-Arno Synal
Summary: This study evaluates glacial landforms preserved within the former LGM Rhine glacier and the eastern lobes of the LGM Reuss glacier system to understand LGM glacier dynamics. Through geomorphological mapping and new dating techniques, it is determined that the Rhine and Reuss glaciers reached their LGM maximum positions around 26-22 ka and 25/24 +/- 2 ka respectively. The glaciers showed subsequent oscillations, with late LGM readvances occurring after 20.6 +/- 1.7 ka and 20.8 +/- 1.3 ka for the Rhine and Reuss glaciers. The results provide valuable insights into the glacial history of the Alpine forelands.
Article
Geosciences, Multidisciplinary
Jimin Yu, Delia W. Oppo, Zhangdong Jin, Matthew Lacerra, Xuan Ji, Natalie E. Umling, David C. Lund, Nick McCave, Laurie Menviel, Jun Shao, Chen Xu
Summary: Atmospheric CO2 can critically influence the global climate, but the mechanisms of carbon transfer between the oceanic and atmospheric reservoirs are poorly understood. Recent studies suggest that during the deglaciation, there was a net release of CO2 in the Atlantic sector of the Southern Ocean, contributing to the rise in atmospheric CO2. Additionally, the expansion of Antarctic Intermediate Water was found to be responsible for the rise in atmospheric CO2 during the Bolling warming event.
Article
Geosciences, Multidisciplinary
Asmita Banerjee, Laurence Y. Yeung, Lee T. Murray, Xin Tie, Jessica E. Tierney, Allegra N. Legrande
Summary: Ice cores and other paleotemperature proxies provide information about past surface temperatures, but little is known about high-altitude temperatures. This study uses the clumped-isotope composition of molecular oxygen in ice cores to infer that the upper troposphere was 6-9 degrees C cooler during the Last Glacial Maximum than during the late preindustrial Holocene.