Results 21 to 30 of about 1,399 (214)
IODP Drilling of the “Shackleton Sites” on the Iberian Margin: A Plio-Pleistocene Marine Reference Section of Millennial-Scale Climate Change [PDF]
Scientific Drilling, 2010 Few marine sediment cores have played such a pivotal role in paleoclimate research as those recovered from the Portuguese Margin, including MD95-2039 to MD95-2042 (hereafter referred to as the “Shackleton sites”) (Fig. 1).
Henrique Duarte +4 more
doaj +1 more source
Ices in Starless and Starforming Cores [PDF]
Proceedings of the International Astronomical Union, 2011 AbstractIcy grain mantles are commonly observed through infrared spectroscopy toward dense clouds, cloud cores, protostellar envelopes and protoplanetary disks. Up to 80% of the available oxygen, carbon and nitrogen are found in such ices; the most common ice constituents – H2O, CO2 and CO – are second in abundance only to H2 in many star forming ...
Oberg, Karin I. +7 more
openaire +2 more sources
Journal of Glaciology, 2022 During the past 20 years, multi-channel radar emerged as a key tool for deciphering an ice sheet's internal architecture. To assign ages to radar reflections and connect them over large areas in the ice sheet, the layer genesis has to be understood on a ...
Seyedhamidreza Mojtabavi +9 more
doaj +1 more source
Climatic signals from 76 shallow firn cores in Dronning Maud Land, East Antarctica [PDF]
The Cryosphere, 2015 The spatial and temporal distribution of surface mass balance (SMB) and δ18O were investigated in the first comprehensive study of a set of 76 firn cores retrieved by various expeditions during the past 3 decades in Dronning Maud Land, East ...
S. Altnau +3 more
doaj +1 more source
Improved direct-count method by fluorescence microscope for low-biomass ice core
Antarctic Record, 2012 Ice cores recovered from ice sheets contain microorganisms that were transported to the surface of the ice sheet along with airborne dust. The abundance of microorganisms in ice cores, as measured by direct cell count under a fluorescence microscope, is ...
Jun Uetake +2 more
doaj +1 more source
Test-Bed Performance of an Ice-Coring Drill Used with a Hot Water Drilling System
Journal of Marine Science and Engineering, 2019 Ice cores from ice shelves contain abundant paleoclimatic information and provide essential information concerned with the prediction of future climatic change and global sea level variations.
An Liu +6 more
doaj +1 more source
Post-coring entrapment of modern air in some shallow ice cores collected near the firn-ice transition: evidence from CFC-12 measurements in Antarctic firn air and ice cores [PDF]
Atmospheric Chemistry and Physics, 2010 In this study, we report measurements of CFC-12 (CCl<sub>2</sub>F<sub>2</sub>) in firn air and in air extracted from shallow ice cores from three Antarctic sites. The firn air data are consistent with the known atmospheric history
M. Aydin +11 more
doaj +1 more source
Optimization of hot-water ice-coring drills
Annals of Glaciology, 2021 Hot-water ice-coring drills are often used to recover ice core samples from desirable depths in conjunction with full-scale hot-water drilling systems. However, the recovered cores exhibit varying qualities.
An Liu +6 more
doaj +1 more source
Journal of GlaciologyRecent ice cores from the Allan Hills, a blue ice area in Antarctica, are nearly 3 million years old. These cores extend ice core chronologies, enabling new insight into key climate periods such as the Mid-Pleistocene Transition.
Liam Reed Kirkpatrick +4 more
doaj +1 more source
Journal of Glaciology, 2022 Dissolved and particulate sodium, magnesium and calcium are analyzed in ice cores to determine past changes in sea ice extent, terrestrial dust variability and atmospheric aerosol transport efficiency.
Mackenzie M. Grieman +8 more
doaj +1 more source