Results 131 to 140 of about 106,138 (355)
Archaeometry, EarlyView.Abstract The use of stone hammers to produce sharp stone flakes—knapping—is thought to represent a significant stage in hominin technological evolution because it facilitated the exploitation of novel resources, including meat obtained from medium‐to‐large‐sized vertebrates. The invention of knapping may have occurred via an additive (i.e., cumulative)
Metin I. Eren +23 more
wiley +1 more source
Synoptic mode of Antarctic summer sea ice superimposed on interannual and decadal variability
Advances in Climate Change Research, 2021 In contrast to decreased Arctic sea ice extent, Antarctic sea ice extent shows a somewhat increased trend. There is a large interannual variability of Antarctic sea ice, especially in the Pacific sector of the Southern Ocean.
Le-Jiang Yu +4 more
doaj
Change and Variability in East Antarctic Sea Ice, and Its Implications [PDF]
, 2016 Although Antarctic sea ice has undergone a small increase in overall extent over the past 30 years, major regional changes have occurred in sea ice coverage in response to changing patterns of large-scale atmospheric circulation.
core +1 more source
Boreas, EarlyView.Morphometric values of streamlined subglacial bedforms provide valuable information about the relative speed, direction, and maturity of past ice streams. This paper presents a new tool that utilizes a machine learning approach to automatically identify glacially derived streamlined features.
Ellianna Abrahams +3 more
wiley +1 more source
The Antarctic circumpolar wave and its seasonality: Intrinsic traveling modes and ENSO teleconnections [PDF]
arXiv, 2018 Interannual variability in the Southern Ocean is investigated via nonlinear Laplacian spectral analysis (NLSA), an objective eigendecomposition technique for nonlinear dynamical systems that can simultaneously recover multiple timescales from data with high skill.
arxiv
Sea-level projections representing deeply uncertain ice-sheet contributions [PDF]
, 2016 Future sea-level rise poses nontrivial risks for many coastal communities. Managing these risks often relies on consensus projections like those provided by the IPCC. Yet, there is a growing awareness that the surrounding uncertainties may be much larger than typically perceived.
arxiv +1 more source
Boreas, EarlyView.Reconstructions of the maximum extent of the Laurentide Ice Sheet (LIS) and its associated ice flows at the Last Glacial Maximum (LGM) are needed for understanding how marine‐based ice sheets will respond to modern climate change. Here, we provide evidence for the location of the maximal extent of the LIS margin during the LGM in Merchants and ...
Alexis P. Belko +4 more
wiley +1 more source
Boreas, EarlyView.Basal conditions that facilitate fast ice flow are still poorly understood and their parameterization in ice‐flow models results in high uncertainties in ice‐flow and consequent sea‐level rise projections. Direct observations of basal conditions beneath modern ice streams are limited due to the inaccessibility of the bed.
Rebecca Schlegel +5 more
wiley +1 more source
Report on the geomorphological survey in the Soya Coast (JARE-61)
Antarctic Record, 2020 The Antarctic Ice Sheet is a major source of future sea-level rise due to global warming. Reconstruction of the past Antarctic Ice Sheet is essential to understand the mechanism of the Antarctic Ice Sheet response to global and regional climate changes ...
Takeshige Ishiwa +3 more
doaj +1 more source
Microwave emissivity of fresh water ice--Lake ice and Antarctic ice pack--Radiative transfer simulations versus satellite radiances [PDF]
arXiv, 2012 Microwave emissivity models of sea ice are poorly validated empirically. Typical validation studies involve using averaged or stereotyped profiles of ice parameters against averaged radiance measurements. Measurement sites are rarely matched and even less often point-by-point.
arxiv