Results 51 to 60 of about 795 (198)

Estimation of gas record alteration in very low-accumulation ice cores [PDF]

Climate of the Past, 2020
We measured the methane mixing ratios of enclosed air in five ice core sections drilled on the East Antarctic Plateau. Our work aims to study two effects that alter the recorded gas concentrations in ice cores: layered gas trapping artifacts and firn ...
K. Fourteau, P. Martinerie, X. Faïn, A. A. Ekaykin, J. Chappellaz, V. Lipenkov   +5 more
doaj   +1 more source

Dynamic time warping to quantify age distortion in firn cores impacted by melt processes

Annals of Glaciology, 2023
As warming intensifies across the Greenland ice sheet, an increasing number of shallow coring and radar studies are targeting the melt-impacted firn column to investigate meltwater processes.
Cedric J. Hagen, Joel T. Harper
doaj   +1 more source

Critical porosity of gas enclosure in polar firn independent of climate [PDF]

Climate of the Past, 2017
In order to interpret the paleoclimatic record stored in the air enclosed in polar ice cores, it is crucial to understand the fundamental lock-in process.
C. F. Schaller, J. Freitag, O. Eisen, O. Eisen   +3 more
doaj   +1 more source

Weather Regimes Preclude the Observation of a Southern Annular Mode Signal in Two Coastal East Antarctic Ice Cores

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 10, 28 May 2026.
Abstract The Southern Annular Mode (SAM) represents the dominant pattern of climate variability in the extratropical Southern Hemisphere. However, its signature in coastal East Antarctic ice core records is unclear. A daily synoptic typing data set for the southern Indian Ocean constructed using self‐organizing maps on 500 hPa daily geopotential height
Danielle Udy, Sarah Jackson, Tessa R. Vance, Benjamin Pohl, Anthony S. Kiem, Neil J. Holbrook, Chris Plummer, Jonathan D. Wille, Vincent Favier, Camilla Crockart, Margaret Harlan, Nerilie Abram, Chelsea A. Long, Meredith Nation, Poul Christoffersen, Matt King   +15 more
wiley   +1 more source

Passive Radar Sounding for Firn Aquifer Monitoring

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Firn aquifers may play an important role in the mass balance of the Greenland ice sheet, but changes in their water storage are challenging to measure due to their spatiotemporal variability.
Sean T. Peters, Angela Wang, Riley Culberg   +2 more
doaj   +1 more source

Interannual Variations of Precipitation Events at Dome Fuji Station, Antarctica

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 10, 28 May 2026.
Abstract Precipitation is key to the water budget of inland Antarctica, with extreme precipitation events strongly influencing snowfall and surface climatology. To investigate the contribution and trends of such events at Dome Fuji station (DF) in inland Antarctica, this study analyzed precipitation variability using the ERA5 product validated against ...
Kyohei Yamada, Jun Inoue, Naohiko Hirasawa, Kazutoshi Sato   +3 more
wiley   +1 more source

Challenges in modeling the energy balance and melt in the percolation zone of the Greenland ice sheet

Journal of Glaciology, 2023
Increased surface melt in the percolation zone of the Greenland ice sheet causes significant changes in the firn structure, directly affecting the amount and timing of meltwater runoff.
Federico Covi, Regine Hock, Carleen H. Reijmer   +2 more
doaj   +1 more source

Temporal Variations in Seismic Ambient Noise Identify Seasonal Changes in Basal Conditions at Sermeq Kujalleq in Kangia, Greenland

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract Subglacial processes are key to glacier dynamics but remain poorly constrained due to limited in situ observations. We use continuous seismic and Global Navigation Satellite System (GNSS) measurements to investigate summer basal conditions at Sermeq Kujalleq in Kangia (SKK; Jakobshavn Isbræ), Kalaallit Nunaat (Greenland).
Janneke van Ginkel, Adrien Wehrlé, Ana Nap, Fabian Walter, Andrea Kneib‐Walter, Hugo Rousseau, Martin P. Lüthi   +6 more
wiley   +1 more source

Observation and Coordination Needs for Current, Near‐Future, and Next Generation Earth‐Observing SAR Systems

Earth and Space Science, Volume 13, Issue 5, May 2026.
Abstract This paper summarizes an evaluation by experts of how coordination of Earth‐observing Synthetic Aperture Radar (SAR) missions among the world's space agencies could advance toward game‐changing scientific discoveries and fully realizing SAR's practical capability to address many issues facing society.
Cathleen E. Jones, Ake Rosenqvist, Björn Rommen, Magdalena Fitrzyk, Eric Rignot, Bernd Scheuchl, Yujie Zheng, Andrew Hooper, Mark Simons, Tomokazu Kobayashi, Paul Siqueira, Maurizio Santoro, Takeo Tadono, Laura Hess, Heather McNairn, Laura Frulla, Malin Johansson, Wolfgang Dierking, Line Rouyet, Annett Bartsch, Paco Lopez Dekker, Johnny A. Johannessen   +21 more
wiley   +1 more source

Revealing firn structure at Dome A region in East Antarctica using cultural seismic noise [PDF]

The Cryosphere
Antarctica is mostly covered by snow, firn, and glacier ice, and the transformation from snow to firn and glacier ice influences energy transfer and material transport in polar regions.
Z. Song, Z. Song, Y. Pan, Y. Pan, J. Li, J. Li, H. Peng, H. Peng, Y. Wang, Y. Wang, Y. Yang, Y. Yang, K. Lu, X. Tang, X. Tang, X. Zhang, X. Zhang, X. Zhang   +17 more
doaj   +1 more source