Found 14089 items
1 January, 1988
Survey data from three transverse profiles across Rutford Ice Stream show that most of the shear deformation occurs in boundary layers about 10 km wide on both sides of the…Read more on Relative importance of lateral and vertical shear on Rutford Ice Stream, Antarctica
1 January, 1988
1. Studies of serum 25-hydroxy-vitamin D (25-OHD) in the Antarctic have been undertaken in husky dog, seal and penguin and compared to man. 2. Husky dogs showed a reversal of…1 January, 1988
Results of freeze‐thaw simulations on three large blocks of quartz‐micaschist are presented. Three types of water to ice phase change were identified from temperature and ultrasonic measurements. It is suggested…1 January, 1988
Most of the exploited fish stocks in the North Sea are also used as a food supply by a number of seal species; the same is true for some fish…1 January, 1988
The Southern Coastal Batholith of central Chile is mainly composed of calc-alkaline granitoids of Late Carboniferous to Permian age. There is no clear evidence of the existence of older plutonic…Read more on Granitoids of the Coast Range of central Chile: Geochronology and geologic setting
1 January, 1988
Following the cessation of subduction along the Antarctic Peninsula, there was a change in the character of the magmatism from calc-alkaline to alkaline. A Miocene-Pliocene suite of basanites, tephrites and…Read more on Post-subduction alkaline volcanism along the Antarctic Peninsula
1 January, 1988
Broadband Jovian radio emission in the kilometric wavelength range (bKOM) observed by the Voyagers 1 and 2 (V1 and V2) planetary radioastronomy, PRA, experiments have been analysed for the period…Read more on Analysis of Jovian kilometric radiation simultaneously observed by voyagers 1 and 2
1 January, 1988
Antarctic wood-boring bivalves are described from the Kotick Point Formation, Gustav Group (Early Cretaceous) and the Marambio Group (Late Cretaceous) of the James Ross Island group, and from the Early…1 January, 1988 by Ed King
Marine geophysical studies of the South Orkney microcontinent show two intersecting tectonic fabrics of different age. The older fabric is oriented E-W, and represents the magmatic arc and fore-arc created…1 January, 1988
A steep reverse fault at Engel Peaks, Antarctic Peninsula, cuts granophyre and overlying volcanic rocks and incorporates a lower angle zone or ‘fault step’. The reverse fault step differs from…Read more on Reverse fault step at Engel Peaks, Antarctic Peninsula
1 January, 1988
A 130 m long ice core has been dielectrically profiled. From an analysis of the measurements, we obtain a profile of the high-frequency (radio-echo) conductivity. This profile has been represented…Read more on Dielectric variability of a 130 m Antarctic ice core: implications for radar sounding
1 January, 1988 by Robert Mulvaney
High-resolution anion profiles of Cl-, NO3- and SO4 2− are presented for two cores from the Antarctic Peninsula. A 47.2 m core from a site on the Palmer Land plateau…1 January, 1988 by Eric Wolff, Robert Mulvaney
It has been suggested1,2 that acids in the cold polar ice sheets may exist as aqueous mixtures at grain boundaries. This assumption can correctly predict the d.c. conductivity of polar…Read more on Sulphuric acid at grain boundaries in Antarctic ice
1 January, 1988
Carboniferous, igneous, and metamorphic rocks, followed by Jurassic, Cretaceous, and particularly extensive Miocene granitoid plutons, crop out in the Andes of the Lake Region, as determined by new K-Ar and…Read more on Geochronology of the Lake Region of south-central Chile (39°–42°S): Preliminary results
1 January, 1988
New field and laboratory studies result in a redefinition of the three main lithostratigraphic units of the Thiel Mountains. These are (1) the Thiel Mountains porphyry, a massive hypersthene-bearing monzonite,…1 January, 1988
Mesozoic and Cenozoic granitoids of this segment of the Andes occur in three N/S-trending belts: western (WB), central (CB), and eastern (EB). The WB is formed by the Mincha and…1 January, 1988
Hobbs Pool is an area of thin ice shelf situated within George VI Ice Shelf, Antarctica. Thicker ice shelf surrounding Hobbs Pool isolates the upper 155 m of the water…Read more on Localized basal freezing within George VI Ice Shelf, Antarctica
1 January, 1988 by Robert Mulvaney
Whilst stable-isotope analysis of ice cores yields the best quantitative evidence for past climate, there remains considerable uncertainty about the detailed relationship between the isotopic composition and air temperature. Analysis…1 January, 1988
Tide gauge and atmospheric sea level pressure measurements from each side of Drake Passage are compared with multiyear time series of bottom pressure at 500 m depth. Synthetic subsurface pressure…Read more on Comparisons of sea level and bottom pressure measurements at Drake Passage
1 January, 1988
Scintillation data from near Boston, U.S.A., and spread-F data from Argentine Islands, Antarctica are used to investigate the diurnal and seasonal variations of the simultaneous occurrence of medium-scale (~ 1–10…1 January, 1988
When data are transformed for statistical analysis bias occurs when backtransforming means to the untransformed scale. The bias can produce grossly misleading conclusions. Anomalous results of two different analyses are…Read more on A cautionary note on data transformation: bias in back-transformed means
1 January, 1988
(1) This analysis of monitoring data is based on twenty-seven British and Irish colonies where individual guillemots (Uria aalge) were counted repeatedly in clearly defined areas of cliff (plots) 1975-82.…Read more on Analysis of counts from monitoring guillemots in Britain and Ireland
1 January, 1988
The dynamics, radiation, and chemistry of the atmosphere are outlined in an attempt to explain the processes behind springtime Antarctic ozone depletion. Recent observations made by Gardiner and Shanklin (1986)…1 January, 1988
The dynamics of the upper thermosphere in the southern polar cap, auroral, and mid‐latitude zones is reviewed. Information has been drawn from published measurements from the DE 2 and AE‐C…Read more on Southern hemisphere thermospheric dynamics: A review
1 January, 1988
The terrestrial environment of Signy Island, South Orkney Islands, maritime Antarctic, is undergoing rapid and possibly irreversible change caused by a natural biological agent. During the past decade there has…1 January, 1988
Fabry-Perot interferometer Doppler measurements of the 6300 Å oxygen emission line have been used to determine the neutral thermospheric wind over Halley, Antarctica. Simultaneous measurements of the local magnetic field…1 January, 1988
Five post-tectonic granitic plutons isolated within the central Ellsworth-Whitmore mountains crustal block in West Antarctica form a distinctive geochemical suite. All have some characteristics of S-type granites and are atypical…1 January, 1988
The Antarctic Peninsula Mesozoic magmatic arc has had a long history of dextral, strike-slip deformation. The deformation was initially associated with the development of a wide accretionary complex, by the…Read more on Role of strike-slip faulting in the tectonic evolution of the Antarctic Peninsula
1 January, 1988
Of all the world?s continents Antarctica is the coldest, the highest, and the least known. It is one and a half times the size of the United States, and on…Read more on Satellite image atlas of glaciers of of the world – Antarctica
1 January, 1988
A collation of available data shows that sea-water with a temperature 3°C above the in-situ freezing point lies beneath George VI Ice Shelf in the Antarctic Peninsula, and is widespread…Read more on Oceanic environment of George VI Ice Shelf, Antarctic Peninsula
1 January, 1988 by Eric Wolff, Robert Mulvaney
Analysis of an ice sample with an estimated age of 125 years, from the Antarctic Peninsula, using a scanning electron microscope with a cold stage and an X-ray micro-analysis facility,…1 January, 1988 by Eric Wolff
Clean sampling and analysis procedures have been used to measure the concentrations of Al and four heavy metals in snow representing one year’s accumulation (1983-84) near Dye 3 in Greenland.…1 January, 1988
A large (100 km N/S), stable, smoothly‐structured and significant depletion (15% in number density) of the daytime Tromsø F‐region was produced inadvertently during a Heater polarisation and beam‐forming procedure. We…Read more on A large-scale ionospheric depletion by intense radio wave heating