scholarly journals Supplementary material to "Significant mass loss in the accumulation area of the Adamello glacier indicated by the chronology of a 46 m ice core"

2020 ◽  
Author(s):  
Daniela Festi ◽  
Margit Schwikowski ◽  
Valter Maggi ◽  
Klaus Oeggl ◽  
Theo Manuel Jenk
Keyword(s):  
Mass Loss ◽  
Ice Core ◽  
Supplementary Material ◽  
Significant Mass Loss ◽  
Significant Mass

Dating of ice cores from temperate glaciers - Significant mass loss in the accumulation area of the Adamello glacier indicated by the chronology of a 46 m ice core

2021 ◽  
Author(s):  
Theo Jenk ◽  
Daniela Festi ◽  
Margit Schwikowski ◽  
Valter Maggi ◽  
Klaus Oeggl
Keyword(s):  
Mass Loss ◽  
Ice Core ◽  
Ice Cores ◽  
Italian Alps ◽  
Accumulation Zone ◽  
The Core ◽  
Annual Layer ◽  
Significant Mass Loss ◽  
Carbon Concentrations ◽  
Significant Mass

<p>Dating glaciers is an arduous yet essential task in ice core studies, which becomes even more challenging for the dating of glaciers suffering from mass loss in the accumulation zone as result of climate warming. In this context, we present the dating of a 46 m deep ice core from the Central Italian Alps retrieved in 2016 from the Adamello glacier (Pian di Neve, 3100 m a.s.l.). We will show how the timescale for the core could be obtained by integrating results from the analyses of the radionuclides <sup>210</sup>Pb and <sup>137</sup>Cs with annual layer counting derived from pollen and refractory black carbon concentrations. Our results clearly indicate that the surface of the glacier is older than the drilling date of 2016 by about 20 years and that the 46 m ice core reaches back to around 1944. Despite the severe mass loss affecting this glacier even in the accumulation zone, we show that it is possible to obtain a reliable timescale for such a temperate glacier. These results are very encouraging and open new perspectives on the potential of such glaciers as informative palaeoarchives. We thus consider it important to present our dating approach to a broader audience.</p>

scholarly journals Significant mass loss in the accumulation area of the Adamello glacier indicated by the chronology of a 46 m ice core

2021 ◽  
Vol 15 (8) ◽  
pp. 4135-4143
Author(s):  
Daniela Festi ◽  
Margit Schwikowski ◽  
Valter Maggi ◽  
Klaus Oeggl ◽  
Theo Manuel Jenk
Keyword(s):  
Mass Loss ◽  
Black Carbon ◽  
Ice Core ◽  
Accumulation Zone ◽  
210Pb And 137Cs ◽  
Annual Layer ◽  
Ice Surface ◽  
Drilling Site ◽  
Significant Mass Loss ◽  
Significant Mass

Abstract. Dating glaciers is an arduous yet essential task in ice core studies, which becomes even more challenging when the glacier is experiencing mass loss in the accumulation zone as result of climate warming, leading to an older ice surface of unknown age. In this context, we dated a 46 m deep ice core from the Central Italian Alps retrieved in 2016 from the Adamello glacier in the locality Pian di Neve (3100 m a.s.l.). Here we present a timescale for the core obtained by integrating results from the analyses of the radionuclides 210Pb and 137Cs with annual layer counting derived from pollen and refractory black carbon concentrations. Our results clearly indicate that the surface of the glacier is older than the drilling date of 2016 by about 20 years and that the 46 m ice core reaches back to around 1944. For the period of 1995–2016 the mass balance at the drilling site (former accumulation zone) decreased on average of about 1 m w.e. a−1 compared to the period 1963–1986. Despite the severe mass loss affecting this glacier even in the former accumulation zone, we show that it is possible to obtain a reliable timescale for such a temperate glacier using black carbon and pollen seasonality in combination with radionuclides 210Pb and 137Cs. Our results are therefore very encouraging and open new perspectives on the potential of such glaciers as informative palaeoarchives.

scholarly journals Significant mass loss in the accumulation area of the Adamello glacier indicated by the chronology of a 46 m ice core

2020 ◽  
Author(s):  
Daniela Festi ◽  
Margit Schwikowski ◽  
Valter Maggi ◽  
Klaus Oeggl ◽  
Theo Manuel Jenk
Keyword(s):  
Mass Loss ◽  
Ice Core ◽  
Italian Alps ◽  
Accumulation Zone ◽  
210Pb And 137Cs ◽  
The Core ◽  
Annual Layer ◽  
Significant Mass Loss ◽  
Carbon Concentrations ◽  
Significant Mass

Abstract. Dating glaciers is an arduous yet essential task in ice core studies, which becomes even more challenging when dating glaciers suffering from mass loss in the accumulation zone as result of climate warming. In this context, we dated a 46 m deep ice core from the Central Italian Alps retrieved in 2016 from the Adamello glacier in the locality Pian di Neve (3100 m a.s.l.). Here we present a timescale for the core obtained by integrating results from the analyses of the radionuclides 210Pb and 137Cs with annual layer counting derived from pollen and refractory black carbon concentrations. Our results clearly indicate that the surface of the glacier is older than the drilling date of 2016 by about 20 years and that the 46 m ice core reaches back to around 1944. Despite the severe mass loss affecting this glacier even in the accumulation zone, we show that it is possible to obtain a reliable timescale for such a temperate glacier. Our results are therefore very encouraging and open new perspectives on the potential of such glaciers as informative palaeoarchives.

scholarly journals Formation of a planetary nebula by continuous mass loss

1981 ◽  
Vol 59 ◽  
pp. 345-346
Author(s):  
A. Harpaz ◽  
A. Kovetz
Keyword(s):  
Mass Loss ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Central Star ◽  
Red Giants ◽  
Giant Star ◽  
Continuous Mass ◽  
Red Giant ◽  
Significant Mass Loss ◽  
Significant Mass

The evolution of a 1.2Mʘ star along the asymptotic branch with continuous mass loss is presented, showing that this mass loss leads to the formation of a PN with a typical central star in its center.A former investigation (Harpaz and Kovetz, 1980) has shown that mechanisms for PN creation based on sudden violent processes are not likely to work in the envelope of a red giant star. On the other hand, significant mass loss from red giants was observed as a general phenomenon.We have followed the evolution of a 1.2Mʘ star along the asymptotic branch, including in the evolutionary calculations a mass loss according to Reimers’ empirical formula. It was found that towards the end of this stage, the mass loss rate was about 2.7xl0-6Mʘ/y, which is consistent with the formation of a typical PN within 30,000 years. When the mass content of the hydrogen rich envelope dropped to 1.5x10-3Mʘ, the star began to contract rapidly, forming a typical central star of 0.6Mʘ

scholarly journals Concerning the Deposition and Diagenesis of Strata in Polar Firn

1988 ◽  
Vol 34 (118) ◽  
pp. 283-290 ◽  
Author(s):  
Richard B. Alley
Keyword(s):  
Mass Loss ◽  
Temperature Gradients ◽  
Large Temperature ◽  
Free Atmosphere ◽  
High Accumulation ◽  
Typically Develop ◽  
Gradient Effects ◽  
Annual Signal ◽  
Significant Mass Loss ◽  
Significant Mass

AbstractDepth hoar in polar firn forms when large temperature gradients act on low-density firn, but high-density firn does not develop into depth hoar. Low densities in firn may be depositional (burial of surface hoar or still-air snowfall) or diagenetic (mass loss to the free atmosphere, typically in autumn); however, diagenesis is sufficiently strong to cause significant mass loss only in the top 50–100 mm of firn. Between about 50–100 mm and 2 m depth, grain growth and densification are accelerated strongly by temperature-gradient effects; from 2 to 5 m, temperature gradients have a small but measurable effect on rates of processes in firn, and below 5 m rates essentially have isothermal values.Diagenetic depth-hoar layers typically develop in the autumn, are relatively thick, and have smooth bases. Depositional depth-hoar layers may develop at any season, are relatively thin, and have irregular bases. In low-accumulation regions, visual stratification may preserve only an annual signal, but in high-accumulation regions individual storms or other features may be recognizable.

Re-examining mechanisms of radiation damage in organic specimens

1990 ◽  
Vol 48 (4) ◽  
pp. 812-813
Author(s):  
David A. Armstrong ◽  
Suichu Luo ◽  
David C. Joy
Keyword(s):  
Mass Loss ◽  
Radiation Damage ◽  
Low Dose ◽  
High Resolution Electron Microscopy ◽  
Limiting Factor ◽  
High Dose ◽  
X Ray ◽  
Resolution Electron ◽  
Significant Mass Loss ◽  
Significant Mass

Radiation damage to organic specimens is the major limiting factor in high resolution electron microscopy studies of biological systems. Electron beam irradiation compromises resolution by altering chemical microstructure, resulting in local mass loss and volume shrinkage in a specimen. All significant mass loss is thought to occur prior to a total incident dose of 50 electrons/ square angstrom If this is the case it is hard to reconcile the observation that images must be recorded at doses of less than 100 el/Å in order to avoid excessive mass loss and shrinkage while microanalytical (EDS and EELS) studies of the same tissue are routinely carried out at doses of 104 - 105el/Å2. Also, since most workers typically use either low dose (for imaging) or high dose (for microapalysis) there are apparently no studies in the literature which attempt to follow the process of radiation damage between these two extremes.We have chosen to investigate mass loss in polymer embedding resins such as are routinely used for TEM imaging as well as for X ray microanalytical applications.

scholarly journals Infrared spectra of C-type variables with ISO

1999 ◽  
Vol 191 ◽  
pp. 181-186 ◽  
Author(s):  
J. Hron ◽  
R. Loidl ◽  
S. Höfner ◽  
U.G. Jørgensen ◽  
B. Aringer ◽  
...  
Keyword(s):  
Mass Loss ◽  
Infrared Spectra ◽  
Dust Emission ◽  
Dynamical Model ◽  
Model Parameters ◽  
Carbon Stars ◽  
Synthetic Spectra ◽  
Corrected Data ◽  
Significant Mass Loss ◽  
Significant Mass

We present ISO-SWS spectra for several representative AGB carbon stars obtained at several phases of the pulsational cycle. For stars with significant mass loss we correct the spectra for the dust emission by using DUSTY models. We then compare these corrected data to synthetic spectra based on hydrostatic and dynamical model atmospheres. We also discuss the influence of the fundamental model parameters on the resulting synthetic spectra.

scholarly journals Mechanobiology: A New Frontier in Biology

Biology ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 570
Author(s):  
Tae-Jin Kim
Keyword(s):  
Mass Loss ◽  
Muscle Mass ◽  
Musculoskeletal Tissues ◽  
New Frontier ◽  
Significant Mass Loss ◽  
Significant Mass

As we observe an increase in muscle mass by lifting weights or a significant mass loss in musculoskeletal tissues of astronauts returning after a stay in space, we note the manifestation of the mechanism of mechanotransduction that is central to mechanobiology [...]

scholarly journals Himalayan glaciers experienced significant mass loss during later phases of little ice age

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Mayank Shekhar ◽  
Anshuman Bhardwaj ◽  
Shaktiman Singh ◽  
Parminder S. Ranhotra ◽  
Amalava Bhattacharyya ◽  
...  
Keyword(s):  
Mass Loss ◽  
Little Ice Age ◽  
Ice Age ◽  
Himalayan Glaciers ◽  
Significant Mass Loss ◽  
Significant Mass
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