Results 71 to 80 of about 259,682 (385)
The Anatomical Record, EarlyView.Abstract Measurement error (ME) in geometric morphometrics has been the subject of countless articles, but none specific to the effect of time lags on landmark digitization error. Yet, especially for visiting scientists working on museum collections, it is not uncommon to collect data in multiple rounds, with interruptions of weeks or years. To explore
Andrea Cardini
wiley +1 more source
Early-Warning Signals for the onsets of Greenland Interstadials and the Younger Dryas-Preboreal transition [PDF]
, 2015 The high-frequency band of the $\delta^{18}\mbox{O}$ variations in the North Greenland Ice Core Project displays fluctuation levels that increase as one approaches the onset of an interstadial (warm) period. For some of the events it is possible to establish statistical significance using Monte-Carlo simulations with a non-parametric null model with ...
arxiv +1 more source
An in situ measurement of the radio-frequency attenuation in ice at Summit Station, Greenland [PDF]
J.Glaciol. 61 : 1005-1011, 2015, 2014 We report an in situ measurement of the electric field attenuation length at radio frequencies for the bulk ice at Summit Station, Greenland, made by broadcasting radio-frequency signals vertically through the ice and measuring the relative power in the return ground bounce signal.
arxiv +1 more source
Population, sex ratios and Development in Greenland [PDF]
, 2010 During the 20th century, Greenland society experienced a dramatic transformation from scattered settlements based on hunting, with mostly turf dwellings, to an urbanizing post-industrial economy.
Hamilton, Lawrence C. +1 more
core +2 more sources
Shaping the human face: Periosteal bone modeling across ontogeny
The Anatomical Record, EarlyView.Abstract Facial morphology is a defining aspect of Homo sapiens that distinguishes our species from fossil ancestors and plays a central role in estimating age, sex, and ancestry in both past and present populations. Understanding how the face develops during postnatal ontogeny is essential for interpreting adult facial variation.
Sarah E. Freidline +5 more
wiley +1 more source
A first constraint on basal melt-water production of the Greenland ice sheet
Nature Communications, 2021 Melting at the base of the Greenland Ice Sheet is often disregarded as a source of quantifiable mass loss. In this study, the authors find the basal mass loss is equivalent to 8% of the ice sheet’s present imbalance, and that the loss of mass from basal ...
Nanna B. Karlsson +13 more
doaj +1 more source
Tusk anomalies in narwhals (Monodon monoceros) from Greenland
Polar Research, 2022 The elongated, spiraled tusk of male narwhals (Monodon monoceros) grows continuously throughout the life of the whale and is most likely a secondary sexual trait used in male–male hierarchical competition and possibly in female mate choice.
Eva Garde, Mads Peter Heide-Jørgensen
doaj +1 more source
A 200-year 210Pb record from Greenland [PDF]
, 1997 A continuous profile of 210Pb activity extending back to 1766 has been developed for a firn/ice core collected at Site D in central Greenland in 1984. Unexpectedly high activities of 210Pb were found at the base of this core (0.032 pCi kg−1 in samples ...
Clausen +22 more
core +2 more sources
Chemical species spatial distribution and relationship to elevation and snow accumulation rate over the Greenland Ice Sheet [PDF]
, 1996 Major chemical species (Cl−, NO−3, SO2−4, Na+, K+, Mg2+, Ca2+) from 24 snowpits (sampled at a resolution of 3 cm, total 2995 samples) collected from northern, central, and southern Greenland were used for this investigation.
Linder, E. +4 more
core +3 more sources
Global perspective of nitrate flux in ice cores [PDF]
, 1995 The relationships between the concentration and the flux of chemical species (Cl-, NO3 - , SO42-, Na +, K + , NH4 + , Mg 2+ , Ca 2+) versus snow accumulation rate were examined at GISP2 and 20D in Greenland, Mount Logan from the St.
Dibb, Jack E. +7 more
core +3 more sources