Results 1 to 10 of about 737,718 (307)

Simulations of ice chemistry in cometary nuclei. [PDF]

Astrophys J, 2019
Abstract The first computational model of solid-phase chemistry in cometary nuclear ices is presented. An astrochemical kinetics model, the Model for Astrophysical Gas and Ice Chemical Kinetics And Layering, is adapted to trace the chemical evolution in multiple layers of cometary ice, over a representative period of 5 Gyr.
Garrod RT.
europepmc   +5 more sources

Confirmation-dependent organic phosphor reveals amino acid nanoaggregates in ice with insight for prebiotic chemistry [PDF]

Nature Communications
Freezing-induced enrichment of organic solutes within ice has long been hypothesized to play a pivotal role in prebiotic chemistry and the origins of life, yet direct evidence for the in-ice aggregation of dilute, water-soluble organics has remained ...
Hongping Liu, Hao Su, Ning Chen, Baicheng Zhang, Aoyuan Cheng, Xiaoyu Chen, Xuepeng Zhang, Xiaoguo Zhou, Yongxiang Gao, Wenhui Zhao, Yi Luo, Guoqing Zhang   +11 more
doaj   +2 more sources

The new frontier of microstructural impurity research in polar ice

Annals of Glaciology, 2023
Deciphering the localisation of solid and dissolved impurities on the micron-scale in glacial ice remains a challenge, but is critical to understand the integrity of ice core records and internal deformation.
Nicolas Stoll, Pascal Bohleber, Remi Dallmayr, Frank Wilhelms, Carlo Barbante, Ilka Weikusat   +5 more
doaj   +1 more source

A novel laser melting sampler for discrete, sub-centimeter depth-resolved analyses of stable water isotopes in ice cores

Journal of Glaciology, 2023
We developed a novel laser melting sampler (LMS) for ice cores to measure the stable water isotope ratios (δ18O and δD) as temperature proxies at sub-centimeter depth resolutions.
Yuko Motizuki, Yoichi Nakai, Kazuya Takahashi, Junya Hirose, Yu Vin Sahoo, Masaki Yumoto, Masayuki Maruyama, Michio Sakashita, Kiwamu Kase, Satoshi Wada, Hideaki Motoyama, Yasushige Yano   +11 more
doaj   +1 more source

Prefacing unexplored archives from Central Andean surface-to-bedrock ice cores through a multifaceted investigation of regional firn and ice core glaciochemistry

Journal of Glaciology, 2023
Shallow firn cores, in addition to a near-basal ice core, were recovered in 2018 from the Quelccaya ice cap (5470 m a.s.l) in the Cordillera Vilcanota, Peru, and in 2017 from the Nevado Illimani glacier (6350 m a.s.l) in the Cordillera Real, Bolivia. The
Heather M. Clifford, Mariusz Potocki, Charles Rodda, Daniel Dixon, Sean Birkel, Michael Handley, Elena Korotkikh, Douglas Introne, Franciele Schwanck, Flavia A. Tavares, Ronaldo T. Bernardo, Filipe G. L. Lindau, Oscar Vilca Gomez, Harrison Jara-Infantes, Victor Bustínza Urviola, L. Baker Perry, Jonathan Maurer, Anton Seimon, Margit Schwikowski, Gino Casassa, Shugui Hou, Andrei V. Kurbatov, Kimberley R. Miner, Jefferson C. Simões, Paul A. Mayewski   +24 more
doaj   +1 more source

A multi-millennial record of rock glacier ice chemistry (Lazaun, Italy)

Frontiers in Earth Science, 2023
Active rock glaciers—known as mixtures of unconsolidated debris with interstitial ice, ice lenses or a core of massive ice—are widespread indicators of mountain permafrost. The age of a frozen rock glacier core in the Central European Alps (Lazaun, Italy)
Ulrike Nickus, Hansjörg Thies, Karl Krainer, Kathrin Lang, Volkmar Mair, David Tonidandel   +5 more
doaj   +1 more source

Cold cloud microphysical process rates in a global chemistry–climate model [PDF]

Atmospheric Chemistry and Physics, 2021
Microphysical processes in cold clouds which act as sources or sinks of hydrometeors below 0 ∘C control the ice crystal number concentrations (ICNCs) and in turn the cloud radiative effects.
S. Bacer, S. Bacer, S. C. Sullivan, O. Sourdeval, H. Tost, J. Lelieveld, J. Lelieveld, A. Pozzer   +7 more
doaj   +1 more source

Inclusions in ice layers formed by melting and refreezing processes in a Greenland ice core

Journal of Glaciology, 2023
In recent decades, surface melting on the inland Greenland ice sheet has increased, leading to significant meltwater-refreezing in the snow and firn.
Kaoru Kawakami, Yoshinori Iizuka, Sumito Matoba, Teruo Aoki, Takuto Ando   +4 more
doaj   +1 more source

Pan-Arctic surface ozone: modelling vs. measurements [PDF]

Atmospheric Chemistry and Physics, 2020
Within the framework of the International Arctic Systems for Observing the Atmosphere (IASOA), we report a modelling-based study on surface ozone across the Arctic. We use surface ozone from six sites – Summit (Greenland), Pallas (Finland), Barrow (USA),
X. Yang, A.-M. Blechschmidt, K. Bognar, A. McClure-Begley, A. McClure-Begley, S. Morris, S. Morris, I. Petropavlovskikh, I. Petropavlovskikh, A. Richter, H. Skov, K. Strong, D. W. Tarasick, T. Uttal, M. Vestenius, X. Zhao   +15 more
doaj   +1 more source

CHEMISTRY IN EVAPORATING ICES—UNEXPLORED TERRITORY [PDF]

The Astrophysical Journal, 2010
We suggest that three-body chemistry may occur in warm high density gas evaporating in transient co\textendash desorption events on interstellar ices. Using a highly idealised computational model we explore the chemical conversion from simple species of the ice to more complex species containing several heavy atoms, as a function of density and of ...
Cecchi-Pestellini, Cesare, Rawlings, Jonathan M. C., Viti, Serena, Williams, David A.   +3 more
openaire   +2 more sources