GLORIA — GEOMAR Library Ocean Research Information Access

Treffer pro Seite

Treffer 1 - 4 | 4 Treffer

Sortierung

Unbekannt

Common climatic signal from glaciers in the European Alps over the last 50 years (2017)

C. Vincent, A. Fischer, C. Mayer, A. Bauder, S. P. Galos, M. Funk, E. Thibert, D. Six, L. Braun, M. Huss

Wiley-Blackwell

In: Geophysical Research Letters

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2017-01-29

Beschreibung: Conventional glacier-wide mass balances are commonly used to study the effect of climate forcing on glacier melt. Unfortunately, the glacier-wide mass balances are also influenced by the glacier's dynamic response. Investigations on the effects of climate forcing on glaciers can be largely improved by analyzing point mass balances. Using a statistical model, we have found that 52% of the year-to-year deviations in the point mass balances of six glaciers distributed across the entire European Alps can be attributed to a common variability. Point mass balance changes reveal remarkable regional consistencies reaching 80% for glaciers less than 10 km apart. Compared to the steady-state conditions of the 1962-1982 period, the surface mass balance changes are -0.85 m w.e. a -1 for 1983-2002 and -1.63 m w.e. a -1 for 2003-2013. This indicates a clear and regionally consistent acceleration of mass loss over recent decades over the entire European Alps.

Print ISSN: 0094-8276

Digitale ISSN: 1944-8007

Thema: Geologie und Paläontologie , Physik

Publiziert von Wiley-Blackwell im Namen von American Geophysical Union (AGU).

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

PAPER CURRENT

Volltext

Unbekannt

Phase transition and metallization of FeO at high pressures and temperatures (2011)

Rebecca A. Fischer, Andrew J. Campbell, Oliver T. Lord, Gregory A. Shofner, Przemyslaw Dera and Vitali B. Prakapenka

Wiley-Blackwell

In: Geophysical Research Letters

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2011-12-16

Beschreibung: Wüstite, Fe1-xO, is an important component in the mineralogy of Earth's lower mantle and may also be a component of the core. Therefore its high pressure-temperature behavior, including its electronic structure, is essential to understanding the nature and evolution of Earth's deep interior. We performed X-ray diffraction and radiometric measurements on wüstite in a laser-heated diamond anvil cell, finding an insulator-metal transition at high pressures and temperatures. Our data show a negative slope for this apparently isostructural phase boundary, which is characterized by a volume decrease and emissivity increase. The metallic phase of FeO is stable at conditions of the lower mantle and core, which has implications for the high P-T character of Fe-O bonds, magnetic field propagation, and lower mantle conductivity.

Print ISSN: 0094-8276

Digitale ISSN: 1944-8007

Thema: Geologie und Paläontologie , Physik

Publiziert von Wiley-Blackwell im Namen von American Geophysical Union (AGU).

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

PAPER CURRENT

Volltext

Unbekannt

Axisymmetric circulation driven by marginal heating in ice-covered lakes (2015)

G.B. Kirillin, A.L. Forrest, K. Graves, A. Fischer, C. Engelhardt, B.E. Laval

Wiley-Blackwell

In: Geophysical Research Letters

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2015-04-01

Beschreibung: Below the temperature of maximum density (TMD) in freshwater lakes, heating at the lateral margins produces gravity currents along the bottom slope, akin to katabatic winds in the atmosphere and currents on continental shelves. We describe axisymmetric basin-scale circulation driven by heat flux at the shorelines in polar Lake Kilpisjärvi. A dense underflow originating near the shore converges towards the lake center, where it produces warm upwelling and return flow across the bulk of lake water column. The return flow, being subject to Coriolis force, creates a lake-wide anticyclonic gyre with velocities of 2-4 cm s -1 . While warm underflows are common on ice-covered lakes, the key finding is the basin-scale anticyclonic gyre with warm upwelling in the core. This circulation mechanism provides a key to understanding transport processes in (semi-) enclosed basins subject to negative buoyancy flux due to heating (or cooling at temperatures above TMD) at their lateral boundaries.

Print ISSN: 0094-8276

Digitale ISSN: 1944-8007

Thema: Geologie und Paläontologie , Physik

Publiziert von Wiley-Blackwell im Namen von American Geophysical Union (AGU).

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

PAPER CURRENT

Volltext

Unbekannt

High-Pressure, High-Temperature Equations of State Using Nanofabricated Controlled-Geometry Ni/SiO2/Ni Double Hot-Plate Samples (2015)

Jeffrey S. Pigott, Derek A. Ditmer, Rebecca A. Fischer, Daniel M. Reaman, Rostislav Hrubiak, Yue Meng, Robert J. Davis, Wendy R. Panero

Wiley-Blackwell

In: Geophysical Research Letters

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2015-11-26

Beschreibung: We have fabricated novel controlled-geometry samples for the laser-heated diamond anvil cell (LHDAC) in which a transparent oxide layer (SiO 2 ) is sandwiched between two laser-absorbing layers (Ni) in a single, cohesive sample. The samples were mass manufactured (〉10 4 samples) using a combination of physical vapor deposition, photolithography, and wet and plasma etching. The double hot-plate arrangement of the samples, coupled with the chemical and spatial homogeneity of the laser-absorbing layers, addresses problems of spatial temperature heterogeneities encountered in previous studies where simple mechanical mixtures of transparent and opaque materials were used. Here we report thermal equations of state (EOS) for nickel to 100 GPa and 3000 K and stishovite to 50 GPa and 2400 K obtained using the LHDAC and in situ synchrotron x-ray micro-diffraction. We discuss the inner core composition and the stagnation of subducted slabs in the mantle based on our refined thermal EOS.

Print ISSN: 0094-8276

Digitale ISSN: 1944-8007

Thema: Geologie und Paläontologie , Physik

Publiziert von Wiley-Blackwell im Namen von American Geophysical Union (AGU).

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

PAPER CURRENT

Volltext

Treffer 1 - 4 | 4 Treffer