Blar i Bergen Open Research Archive på forfatter "Wahl, Sonja"
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Atmosphere-Snow Exchange Explains Surface Snow Isotope Variability
Wahl, Sonja; Steen-Larsen, Hans Christian; Hughes, A.G.; Dietrich, Laura Jasmin; Zuhr, A.; Behrens, M.; Faber, Anne-Katrine; Hörhold, M. (Journal article; Peer reviewed, 2022)The climate signal imprinted in the snow isotopic composition allows to infer past climate variability from ice core stable water isotope records. The concurrent evolution of vapor and surface snow isotopic composition ... -
Exploring the role of snow metamorphism on the isotopic composition of the surface snow at EastGRIP
Harris Stuart, Romilly; Faber, Anne-Katrine; Wahl, Sonja; Hörhold, Maria; Kipfstuhl, Sepp; Vasskog, Kristian; Behrens, Melanie; Zuhr, Alexandra M.; Steen-Larsen, Hans Christian (Journal article; Peer reviewed, 2023)Stable water isotopes from polar ice cores are invaluable high-resolution climate proxy records. Recent studies have aimed to improve our understanding of how the climate signal is stored in the stable water isotope record ... -
FLIIMP - a community software for the processing, calibration, and reporting of liquid water isotope measurements on cavity-ring down spectrometers
Sodemann, Harald; Mørkved, Pål Tore; Wahl, Sonja (Journal article; Peer reviewed, 2023)Precise and accurate measurements of the stable isotope composition from precipitation, land ice, runoff, and oceans provide critical information on Earth's water cycle. The analysis, post-processing, and calibration of ... -
The Influence of the Surface Humidity Flux on the Snow Isotopic Composition. Revisiting the Formation of the Climate Signal Stored in Ice Core Water Isotope Records
Wahl, Sonja (Doctoral thesis, 2022-02-24)Accurate projections of future climate rely on knowledge of natural climate variability on different time scales. Climate proxies, such as stable water isotope records recovered from ice cores, provide insights into the ... -
Non-Equilibrium Fractionation Factors for D/H and 18O/16O During Oceanic Evaporation in the North-West Atlantic Region
Zannoni, Daniele; Steen-Larsen, Hans Christian; Peters, A.J.; Wahl, Sonja; Sodemann, Harald; Sveinbjörnsdóttir, A.E. (Journal article; Peer reviewed, 2022)Ocean isotopic evaporation models, such as the Craig-Gordon model, rely on the description of nonequilibrium fractionation factors that are, in general, poorly constrained. To date, only a few gradient-diffusion type ... -
Post-depositional modification on seasonal-to-interannual timescales alters the deuterium-excess signals in summer snow layers in Greenland
Town, Michel Stephen; Steen-Larsen, Hans Christian; Wahl, Sonja; Faber, Anne-Katrine; Behrens, Melanie; Jones, Tyler R.; Sveinbjornsdottir, Arny (Journal article; Peer reviewed, 2024)We document the isotopic evolution of near-surface snow at the East Greenland Ice Core Project (EastGRIP) ice core site in northeast Greenland using a time-resolved array of 1 m deep isotope (δ18O, δD) profiles. The snow ... -
Quantifying the Stable Water Isotopologue Exchange Between the Snow Surface and Lower Atmosphere by Direct Flux Measurements
Wahl, Sonja; Steen-Larsen, Hans Christian; Reuder, Joachim; Hörhold, Maria (Journal article; Peer reviewed, 2021)Surface processes in high latitudes play an important role in global climate and thus understanding the physics of these systems is critical for improving climate projections. The characterization of the stable water ... -
Retrieval of snow properties from the Sentinel-3 Ocean and Land Colour Instrument
Kokhanovsky, Alexander; Lamare, Maxim; Danne, Olaf; Brockmann, Carsten; Dumont, Marie; Picard, Ghislain; Arnaud, Laurent; Favier, Vincent; Jourdain, Bruno; Le Meur, Emmanuel; Di Mauro, Biagio; Aoki, Teruo; Niwano, Masashi; Rozanov, Vladimir; Korkin, Sergey; Kipfstuhl, Sepp; Freitag, Johannes; Hoerhold, Maria; Zuhr, Alexandra; Vladimirova, Diana; Faber, Anne-Katrine; Steen-Larsen, Hans Christian; Wahl, Sonja; Andersen, Jonas K.; Vandecrux, Baptiste; van As, Dirk; Mankoff, Kenneth D.; Kern, Michael; Zege, Eleonora; Box, Jason E. (Journal article, 2019)The Sentinel Application Platform (SNAP) architecture facilitates Earth Observation data processing. In this work, we present results from a new Snow Processor for SNAP. We also describe physical principles behind the ... -
The role of sublimation as a driver of climate signals in the water isotope content of surface snow: Laboratory and field experimental results
Hughes, Abigail G.; Wahl, Sonja; Jones, Tyler R.; Zuhr, Alexandra; Hörhold, Maria; White, James W. C.; Steen-Larsen, Hans Christian (Journal article; Peer reviewed, 2021)Ice core water isotope records from Greenland and Antarctica are a valuable proxy for paleoclimate reconstruction, yet the processes influencing the climate signal stored in the isotopic composition of the snow are being ... -
A Snapshot on the Buildup of the Stable Water Isotopic Signal in the Upper Snowpack at EastGRIP on the Greenland Ice Sheet
Zuhr, Alexandra M.; Wahl, Sonja; Steen-Larsen, Hans Christian; Hörhold, Maria; Meyer, Hanno; Laepple, Thomas (Journal article; Peer reviewed, 2023)The stable water isotopic composition in firn and ice cores provides valuable information on past climatic conditions. Because of uneven accumulation and post-depositional modifications on local spatial scales up to hundreds ... -
Snow-Atmosphere Humidity Exchange at the Ice Sheet Surface Alters Annual Mean Climate Signals in Ice Core Records
Dietrich, Laura Jasmin; Steen-Larsen, Hans Christian; Wahl, Sonja; Jones, Tyler R.; Town, Michel Stephen; Werner, Martin (Journal article; Peer reviewed, 2023)Surface processes alter the water stable isotope signal of the surface snow after deposition. However, it remains an open question to which extent surface post-depositional processes should be considered when inferring ... -
Spatial and temporal stable water isotope data from the upper snowpack at the EastGRIP camp site, NE Greenland, sampled in summer 2018
Zuhr, Alexandra M.; Wahl, Sonja; Steen-Larsen, Hans Christian; Hörhold, Maria; Meyer, Hanno; Gkinis, Vasileios; Laepple, Thomas (Journal article; Peer reviewed, 2024)Stable water isotopes stored in snow, firn and ice are used to reconstruct climatic parameters. The imprint of these parameters at the snow surface and their preservation in the upper snowpack are determined by a number ... -
An unmanned aerial vehicle sampling platform for atmospheric water vapor isotopes in polar environments
Rozmiarek, Kevin S.; Vaughn, Bruce H.; Jones, Tyler R.; Morris, Valerie; Skorski, William B.; Hughes, Abigail G.; Elston, Jack; Wahl, Sonja; Faber, Anne-Katrine; Steen-Larsen, Hans Christian (Journal article; Peer reviewed, 2021)Above polar ice sheets, atmospheric water vapor exchange occurs across the planetary boundary layer (PBL) and is an important mechanism in a number of processes that affect the surface mass balance of the ice sheets. Yet, ...