Article
Geography, Physical
Michael-Shawn Fletcher, Joel Pedro, Tegan Hall, Michela Mariani, Joseph A. Alexander, Kristen Beck, Maarten Blaauw, Dominic A. Hodgson, Henk Heijnis, Patricia S. Gadd, Agathe Lise-Pronovost
Summary: Climate change during the last deglaciation was potentially influenced by the southern westerlies' latitudinal shifts, affecting CO2 out-gassing from the Southern Ocean. The last deglaciation in the Southern Hemisphere was interrupted by a cooling event, coinciding with a warm phase in the North Atlantic. Research shows a migration of the westerlies during the last deglaciation, driving the rise in atmospheric CO2.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
M. Pauly, C. S. M. Turney, J. G. Palmer, U. Buntgen, A. Brauer, G. Helle
Summary: The Late Glacial dynamics have been demonstrated by records from the North Hemisphere and fewer from the South. New Zealand subfossil kauri tree-rings show a simultaneous downturn around 12,625-12,375 cal BP, indicating a widespread climate deterioration with high precipitation and low temperatures. The study provides new evidence of hydroclimate conditions during the Late Glacial in New Zealand.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geography, Physical
Levan G. G. Tielidze, Shaun R. R. Eaves, Kevin P. P. Norton, Andrew N. N. Mackintosh, Joel B. B. Pedro, Alan J. J. Hidy
Summary: Investigating the glacier-climate system reveals information about past climate change and the response of glaciers to current climate warming. A study of the Ahuriri River catchment in the Southern Alps of New Zealand provides evidence of glacier retreat during the Antarctic Cold Reversal, as well as the formation of ice-sculpted bedrock surfaces. The results suggest that the onset of the Antarctic Cold Reversal triggered early cooling and glacier readvance in New Zealand, possibly due to a latitudinal shift of the Southern Hemisphere westerly wind belt.
JOURNAL OF QUATERNARY SCIENCE
(2023)
Article
Multidisciplinary Sciences
Suning Hou, Lennert B. Stap, Ryan Paul, Mei Nelissen, Frida S. Hoem, Martin Ziegler, Appy Sluijs, Francesca Sangiorgi, Peter K. Bijl
Summary: Based on dinocysts, clumped isotopes, and ice sheet modeling, this study reveals that during the Miocene cooling, the Antarctic ice sheet progressively lowered in height while expanding seawards to maintain a relatively stable volume.
NATURE COMMUNICATIONS
(2023)
Article
Geosciences, Multidisciplinary
Joseph A. Stewart, Tao Li, Peter T. Spooner, Andrea Burke, Tianyu Chen, Jenny Roberts, James W. B. Rae, Victoria Peck, Sev Kender, Qian Liu, Laura F. Robinson
Summary: During the Antarctic Cold Reversal, peak abundances of thick-walled benthic foraminifera Uvigerina bifurcata and corals were observed at shallow depths in the sub-Antarctic, while coral populations at greater depths and further south diminished. The ecological and geochemical data suggest that habitat shifts were driven by a northward migration of food supply into the sub-Antarctic Zone and poorly oxygenated seawater at depth during this Antarctic cooling interval.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Environmental Sciences
Eui-Seok Chung, Seong-Joong Kim, Axel Timmermann, Kyung-Ja Ha, Sang-Ki Lee, Malte F. Stuecker, Keith B. Rodgers, Sun-Seon Lee, Lei Huang
Summary: Satellite observations show slight increases in Antarctic sea-ice extent, contradicting climate model predictions. This study finds that the expansion of sea ice is due to cooling of the Southern Ocean surface, which is primarily linked to teleconnections with the tropical Pacific Ocean. The discrepancy between models and observations may be caused by model bias in the forced response and observed tropical variability.
NATURE CLIMATE CHANGE
(2022)
Article
Geography, Physical
Levan G. Tielidze, Shaun R. Eaves, Kevin P. Norton, Andrew N. Mackintosh, Alan J. Hidy
Summary: This study presents the first glacial chronology dataset from the Ahuriri River valley in the Southern Alps, New Zealand, based on beryllium-10 surface-exposure ages. The results reveal that the former Ahuriri Glacier reached its maximum extent at 19.8 ka and retreated 18 km up-valley by 16.7 ka. The estimated equilibrium-line altitude suggests colder temperatures during these periods compared to the present, with a temperature difference of 5°C and 4.4°C, respectively. This research provides new insights into the glacier behavior and climate conditions in New Zealand during the Last Glacial Maximum.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Meteorology & Atmospheric Sciences
Rasool Porhemmat, Heather Purdie, Peyman Zawar-Reza, Christian Zammit, Tim Kerr
Summary: The study utilized data from automatic weather stations to identify large snowfall events in the New Zealand Southern Alps from 2010 to 2018, finding that these events are associated with strong water vapor transport and deepening low pressure systems, with most being triggered by atmospheric rivers, characterized by increases in low- and midlevel moisture at 700-850 hPa and enhanced meridional winds at 750-850 hPa.
JOURNAL OF HYDROMETEOROLOGY
(2021)
Article
Geochemistry & Geophysics
Yilun Shao, David J. J. Prior, James M. M. Scott, Steven B. B. Kidder, Marianne Negrini
Summary: Mantle xenoliths from the Southern Alps in New Zealand provide insight into the origin of mantle seismic anisotropy related to the Australian-Pacific plate boundary. These xenoliths, including protomylonites and coarse-grained samples, record different deformation kinematics and crystallographic preferred orientations. The microstructures suggest that protomylonites may represent an up-strain progression of subgrain rotation recrystallization, contributing to the development of a new Alpine Fault crystallographic preferred orientation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
M. Jucker, R. Goyal
Summary: Southern Hemisphere Stratospheric Warming Events (SWEs) are usually associated with a negative phase of the tropospheric Southern Annular Mode (SAM) during the following summer. However, through ensemble climate model simulations, it is shown that these SWEs can cause periods of positive tropospheric SAM in austral spring by increasing lower stratospheric static stability and changing troposphere-to-stratosphere wave propagation. Eventually, the tropospheric SAM switches sign to its negative phase in late spring/early summer due to the downward propagation of the stratospheric signal, which is forced dynamically and radiatively by adiabatic heating and increased shortwave absorption by ozone, respectively.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Sunkara Eswaraiah, Kyong-Hwan Seo, Kondapalli Niranjan Kumar, Madineni Venkat Ratnam, Andrey Koval, Jin-Yun Jeong, Chalachew Kindie Mengist, Young-Sook Lee, Katelynn Greer, Jun-Young Hwang, Wonseok Lee, Maniyattu Pramitha, Gasthi Venkata Chalapathi, Mannem Venkatarami Reddy, Yong Ha Kim
Summary: The physical processes and impacts of sudden stratospheric warming (SSW) in the northern hemisphere have been well studied, but little is known about SSW in the southern hemisphere. By analyzing observations from various instruments, researchers found cooling in the Antarctic mesopause during a minor SSW in 2019. The cooling was attributed to the interactions between planetary waves, CO2 infrared cooling, and ozone depletion, rather than adiabatic cooling from gravity waves alone. This study highlights the importance of lower atmosphere chemistry in influencing the thermal structure of the polar mesosphere during SSW.
Article
Multidisciplinary Sciences
Pang-Chi Hsu, Zhen Fu, Hiroyuki Murakami, June-Yi Lee, Changhyun Yoo, Nathaniel C. Johnson, Chueh-Hsin Chang, Yu Liu
Summary: This study reveals that part of the summer cooling trend in East Antarctica is forced by decadal changes in the Madden-Julian Oscillation (MJO), which modifies atmospheric circulations leading to a net cooling trend in East Antarctica. The findings emphasize that changes in intraseasonal tropical climate patterns can have significant implications for climate change in Antarctica.
Article
Meteorology & Atmospheric Sciences
Michael James Salinger, Brian Blair Fitzharris, Trevor Chinn
Summary: New Zealand has been continuously measuring the altitude of end-of-summer snowlines for over four decades, showing a significant increase in recent decades. EOSSALPS is not only related to temperature, but also influenced by regional climate indices and hemispheric scale climate teleconnections.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2021)
Article
Engineering, Chemical
Amit Kumar, Ravi Kumar, Sudhakar Subudhi
Summary: Forced-air cooling of apples often leads to non-uniform temperature distributions due to unidirectional flow which leaves the apples at elevated temperatures. Past studies on improving cooling characteristics have focused more on cooling rate improvements, and this work analyzed the effects of periodic airflow reversal on cooling characteristics and highlighted the challenges faced when using it as an optimization strategy. The results show that periodic flow reversal improves cooling uniformity, energy consumption, and precooling time for all flow velocities, making it a valuable strategy for achieving uniform cooling.
JOURNAL OF FOOD ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Isaac J. Larsen, Andre Eger, Peter C. Almond, Evan A. Thaler, J. Michael Rhodes, Guenther Prasicek
Summary: Chemical weathering affects biogeochemical cycling, climate, and ecosystem function. Physical erosion affects chemical weathering rates by supplying fresh minerals to the critical zone. Vegetation affects chemical weathering rates through physical processes and acid production. However, the role of vegetation in different landscapes is unclear.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Biology
Marco A. Aquino-Lopez, Maarten Blaauw, J. Andres Christen, Nicole K. Sanderson
JOURNAL OF AGRICULTURAL BIOLOGICAL AND ENVIRONMENTAL STATISTICS
(2018)
Article
Geosciences, Multidisciplinary
Xabier Pontevedra-Pombal, Daniel Castro, Martin Souto, Isabel Fraga, William H. Blake, Maarten Blaauw, Jose A. Lopez-Saez, Sebastian Perez-Diaz, Marcos Valcarcel, Eduardo Garcia-Rodeja
GEOSCIENCE FRONTIERS
(2019)
Article
Geochemistry & Geophysics
Christopher Bronk Ramsey, Maarten Blaauw, Rebecca Kearney, Richard A. Staff
Article
Geosciences, Multidisciplinary
C. Cordero-Oviedo, A. Correa-Metrio, L. E. Urrego, G. Vazquez, M. Blaauw, J. Escobar, J. H. Curtis
Review
Biology
Maarten Blaauw, J. Andres Christen, Marco Antonio Aquino-Lopez
JOURNAL OF AGRICULTURAL BIOLOGICAL AND ENVIRONMENTAL STATISTICS
(2020)
Article
Geography, Physical
Christoph Mayr, Philipp Stojakowits, Bernhard Lempe, Maarten Blaauw, Volker Diersche, Madleen Grohganz, Matthias Lopez Correa, Christian Ohlendorf, Paula Reimer, Bernd Zolitschk
QUATERNARY SCIENCE REVIEWS
(2019)
Article
Geosciences, Multidisciplinary
Graeme T. Swindles, Paul J. Morris, Donal J. Mullan, Richard J. Payne, Thomas P. Roland, Matthew J. Amesbury, Mariusz Lamentowicz, T. Edward Turner, Angela Gallego-Sala, Thomas Sim, Iestyn D. Barr, Maarten Blaauw, Antony Blundell, Frank M. Chambers, Dan J. Charman, Angelica Feurdean, Jennifer M. Galloway, Mariusz Galka, Sophie M. Green, Katarzyna Kajukalo, Edgar Karofeld, Atte Korhola, Lukasz Lamentowicz, Peter Langdon, Katarzyna Marcisz, Dmitri Mauquoy, Yuri A. Mazei, Michelle M. McKeown, Edward A. D. Mitchell, Elena Novenko, Gill Plunkett, Helen M. Roe, Kristian Schoning, Ulle Sillasoo, Andrey N. Tsyganov, Marjolein van der Linden, Minna Valiranta, Barry Warner
Article
Geochemistry & Geophysics
Timothy J. Heaton, Maarten Blaauw, Paul G. Blackwell, Christopher Bronk Ramsey, Paula J. Reimer, E. Marian Scott
Article
Geography, Physical
Marco A. Aquino-Lopez, Ana Carolina Ruiz-Fernandez, Maarten Blaauw, Joan-Albert Sanchez-Cabeza
QUATERNARY GEOCHRONOLOGY
(2020)
Article
Geosciences, Multidisciplinary
James S. Eldrett, Manuel Vieira, Liam Gallagher, Matthew Hampton, Maarten Blaauw, Peter K. Swart
Summary: The study presents a highly resolved record of stable carbon isotope values from Late Cretaceous to Palaeogene, integrating carbon isotope stratigraphy with biostratigraphic events to identify major Stage and sub-Stage boundaries. The research provides a long-term and near-continuous stratigraphic record of the Late Cretaceous and earliest Palaeogene in the Central North Sea basin, punctuated by short duration hiatal intervals and a longer hiatus where most of the Cenomanian is missing at the location.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geography, Physical
Sakonvan Chawchai, Liangcheng Tan, Ludvig Lowemark, Hao-Cheng Wang, Tsai-Luen Yu, Yun-Chuan Chung, Horng-Sheng Mii, Guangxin Liu, Maarten Blaauw, Shou-Yeh Gong, Barbara Wohlfarth, Chuan-Chou Shen
Summary: This study presents a decadal-resolved hydroclimate record spanning the past 11,000 years based on delta O-18 data from stalagmites in Kiang Cave on the Thai-Malay Peninsula. It reveals wetter conditions during the early Holocene and a millennial drying period followed by drought conditions. The delta O-18 values reflect climate variability over the entire Holocene period.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geology
Gustavo Olivares-Casillas, Alex Correa-Metrio, Edyta Zawisza, Marta Wojewodka-Przybyl, Maarten Blaauw, Francisco Romero
Summary: The past three millennia have seen global temperature fluctuations of around one degree Celsius and high precipitation variability. The Medieval Warm Period and Little Ice Age have been reported globally. Analysis of a sedimentary record from Lake Metztitlan indicates highly dynamic lacustrine systems, influenced by global and regional climatic variability.
BOLETIN DE LA SOCIEDAD GEOLOGICA MEXICANA
(2021)
Article
Geography, Physical
Michael-Shawn Fletcher, Joel Pedro, Tegan Hall, Michela Mariani, Joseph A. Alexander, Kristen Beck, Maarten Blaauw, Dominic A. Hodgson, Henk Heijnis, Patricia S. Gadd, Agathe Lise-Pronovost
Summary: Climate change during the last deglaciation was potentially influenced by the southern westerlies' latitudinal shifts, affecting CO2 out-gassing from the Southern Ocean. The last deglaciation in the Southern Hemisphere was interrupted by a cooling event, coinciding with a warm phase in the North Atlantic. Research shows a migration of the westerlies during the last deglaciation, driving the rise in atmospheric CO2.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
Agathe Lise-Pronovost, Michael-Shawn Fletcher, Tom Mallett, Michela Mariani, Richard Lewis, Patricia S. Gadd, Andy I. R. Herries, Maarten Blaauw, Hendrik Heijnis, Dominic A. Hodgson, Joel B. Pedro
SCIENTIFIC DRILLING
(2019)
Article
Geography, Physical
Leszek Marks, Alaa Salem, Fabian Welc, Jerzy Nitychoruk, Zhongyuan Chen, Maarten Blaauw, Abdelfattah Zalat, Aleksandra Majecka, Marcin Szymanek, Marta Chodyka, Anna Toloczko-Pasek, Qianli Sun, Xiaoshuang Zhao, Jun Jiang