Results 41 to 50 of about 161,313 (308)

Volatile trace metals deposited in ice as soluble volcanic aerosols during the 17.7.ka eruptions of Mt Takahe, West Antarctic Rift

Frontiers in Earth Science, 2022
Volatile metals are emitted at significant rates as gases and particulates from volcanoes, although their speciation, bioreactivity and longevity during atmospheric transport are essentially unknown. Ice cores provide detailed yet largely unexplored long-
Emily Mason, Marie Edmonds, Joseph R. McConnell   +2 more
doaj   +1 more source

A 200-year 210Pb record from Greenland [PDF]

, 1997
A continuous profile of 210Pb activity extending back to 1766 has been developed for a firn/ice core collected at Site D in central Greenland in 1984. Unexpectedly high activities of 210Pb were found at the base of this core (0.032 pCi kg−1 in samples ...
Clausen, Crozaz, Crozaz, Crozaz, Dibb, Dibb, Finkel, Gromet, Gunten, Gäggeler, Henrik B. Clausen, Jack E. Dibb, Lachenbruch, Laj, Mayewski, Mayewski, Mayewski, McCall, Neftel, Nijampurkar, Robbins, Sanak, Steffensen   +22 more
core   +2 more sources

Summer temperature trend over the past two millennia using air content in Himalayan ice [PDF]

Climate of the Past, 2007
Two Himalayan ice cores display a factor-two decreasing trend of air content over the past two millennia, in contrast to the relatively stable values in Greenland and Antarctica ice cores over the same period.
S. Hou, S. Hou, S. Hou, J. Chappellaz, J. Jouzel, P. C. Chu, V. Masson-Delmotte, D. Qin, D. Raynaud, P. A. Mayewski, V. Y. Lipenkov, S. Kang   +11 more
doaj  

Contamination analysis of Arctic ice samples as planetary field analogs and implications for future life-detection missions to Europa and Enceladus

Scientific Reports, 2022
Missions to detect extraterrestrial life are being designed to visit Europa and Enceladus in the next decades. The contact between the mission payload and the habitable subsurface of these satellites involves significant risk of forward contamination ...
Lígia F. Coelho, Marie-Amélie Blais, Alex Matveev, Tina Keller-Costa, Warwick F. Vincent, Rodrigo Costa, Zita Martins, João Canário   +7 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

Separating gas-giant and ice-giant planets by halting pebble accretion [PDF]

, 2014
In the Solar System giant planets come in two flavours: 'gas giants' (Jupiter and Saturn) with massive gas envelopes and 'ice giants' (Uranus and Neptune) with much thinner envelopes around their cores.
Johansen, Anders, Lambrechts, Michiel, Morbidelli, Alessandro   +2 more
core   +1 more source

A method for continuous239Pu determinations in Arctic and Antarctic ice cores [PDF]

, 2016
Atmospheric nuclear weapons testing (NWT) resulted in the injection of plutonium (Pu) into the atmosphere and subsequent global deposition. We present a new method for continuous semi-quantitative measurement of 239Pu in ice cores, which was used to ...
Arienzo, Monica Michelle, Chellman, Nathan, Criscitiello, Alison Sara, Curran, Mark, Fritzsche, Diedrich, Kipfstuhl, Sepp, McConnell, Joseph R., Mulvaney, Robert, Nolan, Matt, Opel, Thomas, Sigl, Michael, Steffensen, J-P   +11 more
core   +1 more source

An upstream open reading frame regulates expression of the mitochondrial protein Slm35 and mitophagy flux

FEBS Letters, EarlyView.
This study reveals how the mitochondrial protein Slm35 is regulated in Saccharomyces cerevisiae. The authors identify stress‐responsive DNA elements and two upstream open reading frames (uORFs) in the 5′ untranslated region of SLM35. One uORF restricts translation, and its mutation increases Slm35 protein levels and mitophagy.
Hernán Romo‐Casanueva, Ariann E. Mendoza‐Martínez, P. Abril Medina‐Flores, Carlos Campero‐Basaldua, Alexander DeLuna, Soledad Funes   +5 more
wiley   +1 more source

Exploring ice core drilling chips from a cold Alpine glacier for cosmogenic radionuclide (10Be) analysis

Results in Physics, 2016
Ice cores offer unique multi-proxy paleoclimate records, but provide only very limited sample material, which has to be carefully distributed for various proxy analyses.
Lars Zipf, Silke Merchel, Pascal Bohleber, Georg Rugel, Andreas Scharf   +4 more
doaj   +1 more source

A Review of Ice Core Drilling in Cave Environment – Challenges, Achievements and Future Directions

Frontiers in Earth Science, 2022
Worldwide, more than 141 m of ice cores has been extracted from 20 cave ice deposits, with the drilling projects focusing mainly in Central European caves.
Zoltan Kern, Aurel Perșoiu, Aurel Perșoiu, Aurel Perșoiu   +3 more
doaj   +1 more source