A5091385361- Cryospheric studies and observations
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Geology and Paleoclimatology Research
- Atmospheric and Environmental Gas Dynamics
- Groundwater and Isotope Geochemistry
- Climate variability and models
- Isotope Analysis in Ecology
- Methane Hydrates and Related Phenomena
- Winter Sports Injuries and Performance
- Meteorological Phenomena and Simulations
- Atmospheric chemistry and aerosols
- Climate Change and Environmental Impact
- Atmospheric Ozone and Climate
- Geological Studies and Exploration
- Nuclear Physics and Applications
- Radioactive contamination and transfer
- Arctic and Russian Policy Studies
- Hydrology and Watershed Management Studies
- Aerospace Engineering and Energy Systems
Bjerknes Centre for Climate Research
2019-2024
University of Bergen
2019-2024
Earth Science Institute of the Slovak Academy of Sciences
2023
University of Copenhagen
2017
Several recent studies from both Greenland and Antarctica have reported significant changes in the water isotopic composition of near-surface snow between precipitation events. These been linked to exchange with atmospheric vapor sublimation-induced fractionation, but processes are poorly constrained by observations. Understanding quantifying these crucial interpretation ice core climate proxies formulation isotope-enabled general circulation models. Here, we present continuous measurements...
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 developed snow property retrieval technique based on analysis of Ocean and Land Colour Instrument (OLCI) onboard Sentinel-3A/B measurements over clean polluted fields. Using OLCI spectral reflectance in range 400–1020 nm, derived important properties such as broadband albedo,...
The climate signal imprinted in the snow isotopic composition allows to infer past variability from ice core stable water isotope records. concurrent evolution of vapor and surface between precipitation events indicates that post-depositional atmosphere-snow humidity exchange influences hence signal. To date, however, this is not accounted for paeleoclimate reconstructions Here we show vapor-snow explains 36% summertime day-to-day δ18O events, 53% δD variability. Through observations...
Abstract. It is highly uncertain how the humidity flux between snow surface and atmosphere contributes to mass balance (SMB) of interior Greenland Ice Sheet (GrIS). Due sparse observations, evaluations simulated are limited. Model-based estimates contribution SMB are, therefore, unconstrained even disagree in magnitude sign. In this study, we evaluate regional climate model MAR at EGRIP (East Ice-Core Project) site accumulation zone GrIS. We use a combined dataset continuous one-level bulk...
The water vapour isotopic composition (
Abstract We report high resolution measurements of the stable isotope ratios ancient ice ( δ 18 O, D) from N orth Greenland Eem ian deep core (NEEM, 77.45° N, 51.06° E). The record covers period 8–130 ky b2k (y before 2000) with a temporal ≈0.5 and 7 y at top bottom respectively contains important climate events such as 8.2 event, last glacial termination series stadials interstadials. At its part Eemian interglacial. Isotope are calibrated on SMOW/SLAP scale reported GICC05 (Greenland Ice...
Abstract. 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 signal is stored in stable isotope record by addressing influence post-depositional processes on isotopic composition surface snow. In this study, relationship between snow metamorphism and during precipitation-free periods explored using measurements snow-specific area (SSA). Continuous daily SSA East Greenland Ice Core...
The Sentinel Application Platform (SNAP) architecture facilitates Earth Observation data processing (http://step.esa.int/main/toolboxes/snap/). In this work we present results from a new Snow Processor for SNAP. We also describe physical principles behind the developed snow property retrieval technique based on analysis of Ocean and Land Colour Instrument (OLCI) onboard Sentinel-3A/B measurements over clean polluted fields. Using OLCI spectral reflectance in range 400-1020nm, derive...
The optical diameter of the surface snow grains impacts amount energy absorbed by and therefore onset magnitude melt. Snow respond to heating through grain metamorphism growth. During melt, liquid water between markedly increases size, as wet clusters are optically equivalent large grains. We present daily diameters (dopt) retrieved from Greenland ice sheet at 1 km resolution for 2017–2019 using observations Ocean Land Colour Instrument (OLCI) onboard Sentinel-3A. dopt evaluated against 3...
Abstract. We document the isotopic evolution of near-surface snow at East Greenland Ice Core Project (EastGRIP) ice core site in northeast using a time-resolved array 1 m deep isotope (δ18O, δD) profiles. The profiles were taken from May–August during 2017–2019 summer seasons. An age–depth model was developed and applied to each profile, mitigating impacts stratigraphic noise on signals. Significant changes deuterium excess (d) are observed surface as ages. Decreases d up 5 ‰ occur seasons...
Abstract. We document the isotopic evolution of near-surface snow at EastGRIP ice core site in Northeast Greenland National Park using a time-resolved array 1-m deep isotope (δ18O, δD) profiles. The profiles were taken from May–August during 2017–2019 summer seasons. An age-depth model was developed and applied to each profile mitigating impacts stratigraphic noise on signals. Significant changes deuterium excess (d) are observed surface as ages. Decreases d up 5 ‰ occurs seasons after...
Abstract. 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 surface mass balance sheets. Yet, this not well understood has substantial implications for modeling remote sensing hydrologic cycle. Efforts to characterize face logistical challenges including remoteness sheet field camps, extreme weather conditions, low humidity temperature limit effectiveness instruments,...
Abstract. It is highly uncertain how the humidity flux between snow surface and atmosphere contributes to mass balance (SMB) of interior Greenland Ice Sheet (GrIS). Due sparse observations, evaluations simulated are limited. Model-based estimates contribution SMB are, therefore, unconstrained even disagree in magnitude sign. In this study, we evaluate regional climate model MAR at EGRIP (East Ice-Core Project) site accumulation zone GrIS. We use a combined dataset continuous one-level bulk...
Abstract. Stable water isotopes from polar ice cores are invaluable high-resolution climate proxy records. Recent studies have aimed to improve knowledge of how the signal is stored in isotope record by addressing influence post-depositional processes on surface snow isotopic composition. In this study, relationship between changes microstructure after precipitation/deposition events and explored using measurements specific area (SSA). Continuous daily SSA East Greenland Ice Core Project...
Abstract. 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 surface mass balance sheets. Yet, this not well understood, has substantial implications for modeling remote sensing hydrologic cycle. Efforts to characterize face logistical challenges including remoteness sheet field camps, extreme weather conditions, low humidity temperature limits effectiveness instruments,...
Abstract. This study investigates how variations in Arctic sea ice cover influence δ18O of presentday precipitation. is done using the model isoCAM3, an isotope-equipped version National Center for Atmospheric Research Community Atmosphere Model 3. Four sensitivity experiments and one control simulation are performed with prescribed SSTs ice. Each 5 four simulates atmospheric isotopic response to oceanic conditions selected years after beginning satellite era 1979. Results show that...
Deuterium-excess (d) decreases up to 5 o /oo in near-surface snow during some summers at EastGRIP, likely due net sublimation.• After one-to-two years the snowpack, peak d shifts from Autumn layers towards Summer layers.• Isotope-gradient diusion explains but not all of seasonality changes snow.