A5042030361- Cryospheric studies and observations
- Climate change and permafrost
- Geology and Paleoclimatology Research
- Mercury impact and mitigation studies
- Arctic and Antarctic ice dynamics
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Isotope Analysis in Ecology
- Heavy metals in environment
- Methane Hydrates and Related Phenomena
- Geochemistry and Geologic Mapping
- Toxic Organic Pollutants Impact
- Indigenous Studies and Ecology
- Landslides and related hazards
- Smart Materials for Construction
- Marine animal studies overview
- Winter Sports Injuries and Performance
- Arctic and Russian Policy Studies
- Geological Studies and Exploration
- Air Quality and Health Impacts
- Aeolian processes and effects
- Polar Research and Ecology
- Climate variability and models
- Per- and polyfluoroalkyl substances research
- Atmospheric aerosols and clouds
Uppsala University
2014-2024
University of Gothenburg
2020
Tallinn University of Technology
2020
Geological Survey of Canada
2003-2015
Natural Resources Canada
2002-2015
University of Ottawa
2010
Defence Terrain Research Laboratory
2002
University of New Hampshire
1996-2000
Research Article| July 01, 1999 Mount Mazama eruption: Calendrical age verified and atmospheric impact assessed C. M. Zdanowicz; Zdanowicz 1Climate Change Center, University of New Hampshire, Durham, Hampshire 03824, USA Search for other works by this author on: GSW Google Scholar G. A. Zielinski; Zielinski S. Germani 2Micromaterials Inc., Suite 200, 136 Shore Drive, Burr Ridge, Illinois 60521, Author Article Information Publisher: Geological Society America First Online: 02 Jun 2017 Online...
Abstract Black carbon emitted by incomplete combustion of fossil fuels and biomass has a net warming effect in the atmosphere reduces albedo when deposited on ice snow; accurate knowledge past emissions is essential to quantify model associated global climate forcing. Although bottom-up inventories provide historical Carbon emission estimates that are widely used Earth System Models, they poorly constrained observations prior late 20th century. Here we use an objective inversion technique...
Adopting recently developed clean laboratory techniques, antimony (Sb) and scandium (Sc) deposition were measured in a 63.72 m-long ice core (1842–1996) 5 m deep snow pit (1994–2004) collected on Devon Island, Canadian High Arctic. Antimony concentrations ranged from 0.07 to 108 pg g−1 with median of 0.98 (N = 510). Scandium, used as conservative reference element, revealed that dust inputs effectively constant during the last 160 years. The atmospheric Sb signal preserved reflects...
The ice core recovered from Prospector Russell Col on Mt Logan (5.4 km a.s.l.), in the Yukon spans over 20 000 years. This unique record offers a Pacific view of stable isotope and chemical Lateglacial to present. timescale is based seasonal counted years, largest known volcanic acid signatures major shift isotopes chemistry at end Younger Dryas. There are large sustained changes isotopic that anti-correlated with marine continental series. oxygen-18 this area not proxy for palaeotemperature...
A high‐resolution, 8000 year‐long ice core record from the Mt. Logan summit plateau (5300 m asl) reveals initiation of trans‐Pacific lead (Pb) pollution by ca. 1730, and a >10‐fold increase in Pb concentration (1981–1998 mean = 68.9 ng/l) above natural background (5.6 attributed to rising anthropogenic emissions Asia. The largest rise North Pacific 1970–1998 (end record) is contemporaneous with decrease Eurasian American as documented records Greenland, Devon Island, European Alps....
Past emissions of the toxic metal mercury (Hg) persist in global environment, yet these remain poorly constrained by existing data. Ice cores are high-resolution archives atmospheric deposition that may provide crucial insight into past Hg levels during recent and historical time. Here we present a record total (HgT) an ice core from pristine summit plateau (5340 m asl) Mount Logan, Yukon, Canada, representing AD 1410 to 1998. The Colonial Period (∼1603–1850) North American “Gold Rush”...
Atmospheric Pb contamination was studied using snow and ice from the Canadian arctic. Forty‐five samples representing past ten years of accumulation on Devon Island contain an average 45.2 pg/g but only 0.43 Sc. The ratio to Sc (105) is far greater than that soil‐derived dust particles (in range 1 5) which indicates ca. 95 99% recent anthropogenic. Isotopic analyses ( 206 Pb, 207 208 Pb) confirm anthropogenic sources continue dominate atmospheric inputs. Unlike Greenland receives...
At latitude 67°N, Penny Ice Cap on Baffin Island is the southernmost large ice cap in Canadian Arctic, yet its past and recent evolution poorly documented. Here we present a synthesis of climatological observations, mass balance measurements proxy climate data from cores drilled over six decades (1953 to 2011). We find that starting 1980s, entered phase enhanced melt rates related rising summer winter air temperatures across eastern Arctic. Presently, 70 100% (volume) annual accumulation at...
Three ice cores recovered on or near Mount Logan, together with a nearby lake record (Jellybean Lake), cover variously 500 to 30 000 years. This suite of records offers unique view the lapse rate in stable isotopes from lower upper troposphere. The region is climatologically important, being beside Cordilleran pinning-point Rossby Wave system and Aleutian Low. Comparison isotope series over last 2000 years model simulations suggest sudden persistent shifts between modern (mixed) zonal flow...
Abstract The climate of high midlatitude mountains appears to be warming faster than the global average, but evidence for such elevation-dependent (EDW) at higher latitudes is presently scarce. Here, we use a comprehensive network remote meteorological stations, proximal radiosonde measurements, downscaled temperature reanalysis, ice cores, and indices investigate manifestation possible drivers EDW in St. Elias Mountains subarctic Yukon, Canada. Linear trend analysis comprehensively...
We evaluated the concentration, size and distribution of insoluble dust microparticles in snow-pits on Penny Ice Cap (PIC), Baffin Island, to define (1) characteristics modern atmospheric deposition at site (2) relative contributions proximal distal sources, (3) effects summer melting depositional signals snow. The mean concentration (143 μg/kg<sup>-1</sup>), flux (4.8 μg cm<sup>2</sup> yr<sup>-1</sup>) diameter (2.3 μm) deposited PIC are similar those observed remote Arctic sites such as...
Abstract A massive ground-ice body was found exposed in the headwall of a thaw flow developed within Chapman Lake terminal moraine complex on Blackstone Plateau (Ogilvie Mountains, central Yukon Territory), which is contemporaneous to Reid glaciation. Based visible cryostructures 4-m-high headwall, two units were identified: ground ice, overlain sharply by 2 m icy diamicton. The nature and origin ice determined using cryostratigraphy, petrography, stable O–H isotopes molar concentration...
Changes in the extent of seasonal ice were investigated using historical and satellite observations for period 1870–2003. The zone (SIZ) has been gradually expanding since 1870, with a marked acceleration over past three decades, migrated north to encompass all peripheral Arctic seas. expansion SIZ may be increasing salinity upper Ocean, consistent recent observations. migration continental shelves also enhancing formation rate deep waters, which are subsequently advected convective region...
Abstract. Black carbon aerosol (BC), which is emitted from natural and anthropogenic sources (e.g., wildfires, coal burning), can contribute to magnify climate warming at high latitudes by darkening snow- ice-covered surfaces, subsequently lowering their albedo. Therefore, modeling the atmospheric transport deposition of BC Arctic important, historical archives accumulation in polar ice help validate such efforts. Here we present a > 250-year ice-core record refractory (rBC) on Devon cap,...
The Arctic environment harbors a complex mosaic of mercury (Hg) and carbon (C) reservoirs, some which are rapidly destabilizing in response to climate warming. sources riverine Hg across the Mackenzie River basin (MRB) uncertain, leads poor understanding potential future release. Measurements dissolved particulate (DHg, PHg) (DOC, POC) concentration were performed, along with analyses stable isotope ratios (incl. ∆199Hg, δ202Hg), radiocarbon content (∆14C) optical properties DOC river water....
Abstract Correlation between glaciochemical time Series from an ice core collected on Devon Ice Cap, Nunavut, Canada, and gridded of Sea-ice concentrations reveals Statistically Significant inverse relationships Sea-salt (mainly Na + , Mg 2+ Cl – ) in the cover Baffin Bay over period 1980–97. An empirical orthogonal function (Eof) analysis performed all major ions Shows that dominant mode variability (Eof1) represents a Signal, which correlates best with concentration Bay. On Seasonal basis,...
The area and volume of sea ice in the Arctic Ocean is decreasing, with some predicting ice‐free summers by 2100 A.D. [ Johannessen et al ., 2004]. implications these trends for transportation ecosystems are profound; example, summer shipping through Northwest Passage could be possible, while loss cause stress polar bears. Moreover, global climate may affected albedo feedbacks increased production export. With more open water, new forms winter, which melts and/or gets exported out Arctic.
High‐resolution (1 mm) stratigraphic information was derived from digital image analysis of an ice core the Prince Wales (POW) Icefield, Central Ellesmere Island, Canada. Following careful processing, a profile transmitted light greyscale images and used to reconstruct high‐resolution density variations for unfractured sections core. Images were further classified into infiltration glacier using automatic thresholding procedure, converted melt percentage index. The mean annual over last 580...