Polar snow and ice masses exert a profound influence on global climate and ocean circulation, and are in turn influenced by climate. Satellite remote sensing constitutes the only practical and systematic means of gaining long-term overviews of any change or variability that may be occurring in key snow and ice parameters. Current relevant satellite sensors are reviewed and future developments evaluated to determine how these may lead to improved retrievals of the key parameters. Sensors to be launched on satellite platforms planned for the end of the century and beyond include both improved versions of existing sensors (such as MODIS) and new classes of sensors (such as imaging spectrometers and laser rangers/altimeters) applied to polar remote sensing for the first time.

A weather surveillance radar model 88–D (WSR–88D) was installed on Pedro Dome, a hill approximately 23 km north of Fairbanks, in the late summer of 1993. The radar commenced operation in September 1993. The Fairbanks radar was the first Doppler weather radar installed in Alaska and the farthest north modern weather radar in the world. During the winter of 1993–1994 the Fairbanks radar gave meteorologists their first detailed look at the meteorology of interior Alaska. The area encompassed by the radar's field of view includes complex terrain—both large flatlands and highlands reaching more than 1 km above the valley floor.

This new opportunity yielded some surprises. Foremost among them is the unanticipated complexity and small scale of meteorological processes during the winter in an Arctic region. Sequences of composite reflectivity show a consistent pattern of considerable change over time spans of 10–30 minutes, as well as large variance of reflectivity over distances of 10 km or less. The reflectivity patterns are often composed of banded structures, with small granular areas of higher echo return embedded within. The large-scale bands can be correlated to synoptic scale patterns of wind aloft, while the smaller cellular structures in the bands may be partly attributed to upslope flow over hills. However, some areas of strong radar return appear to have no relation to topography. The high stability of the airmass over Fairbanks most of the winter would appear to rule out convection. Gravity waves at the top of strong temperature inversions are a possible cause. It is presumed that other processes are at work in this scene, and they remain unexplained.

The present study confirms that the auroras of the nightside oval population consist of two main types, namely storm and substorm aurora. Storm-type aurora, which is relatively infrequent, results from bombardment of the upper ionosphere by fast particle streams generated in the solar wind by cataclysmic solar events related to coronal mass ejections. The associated turbulent plasma that is injected into the magnetosphere produces great magnetic storms of world-wide dimensions that may last for days. In contrast, substorm aurora is a frequent (almost daily) occurrence that lasts for an hour or two around geomagnetic midnight. It is generated by the impulsive release of stored magnetospheric energy from the substorm onset region in the Earth's magnetotail and is associated with localised negative magnetic bays in the H (horizontal)-component of the Earth's magnetic field in the vicinity of the auroral oval.

Sledges have been used for millennia in Arctic and sub-Arctic regions. Until the advent of British Arctic land exploration in the nineteenth century, explorers in these regions had relied on indigenous sledges. The British, and individuals from other nations engaging in polar exploration, often faced different conditions and challenges from those that had faced indigenous peoples, and so a period of adaptation and invention began, to develop sledges that better suited the needs of European survey parties. This paper looks at the range of indigenous sledges and the development of various polar sledge types based on indigenous ski-runner, edge-runner, and toboggan styles of sledges. The development of the Nansen sledge, which became the norm in the Antarctic, is discussed, and the issues and debates involving man-hauling versus dog-hauling and the relative effectiveness of sledges and motive power as shown by recorded sledging performances are outlined.

A survey of ice growth and decay processes on a selection of shallow and deep sub-Arctic and Arctic lakes was conducted using radiometrically calibrated ERS-1 SAR images. Time series of radar backscatter data were compiled for selected sites on the lakes during the period of ice cover (September to June) for the years 1991–92 and 1992–93. A variety of lake-ice processes could be observed, and significant changes in backscatter occurred from the time of initial ice formation in autumn until the onset of the spring thaw. Backscatter also varied according to the location and depth of the lakes. The spatial and temporal changes in backscatter were most constant and predictable at the shallow lakes on the North Slope of Alaska. As a consequence, they represent the most promising sites for long-term monitoring and the detection of changes related to global warming and its effects on the polar regions.

The Inuit of Canada's eastern Arctic are increasingly turning to tourism as a source of much-needed income and employment. The government of the Northwest Territories, in conjunction with local communities, is attempting to develop a ‘sustainable’ form of tourism in the region, with an emphasis on maximizing local economic linkages while minimizing negative socio-cultural and environmental impacts. One key strategy for increasing the ‘downstream’ benefits of visitor expenditure has been an attempt to forge better links between tourism and the region's arts sector. This paper examines some of the key issues and problems that face the implementation of such a strategy in the Baffin Island hamlet of Cape Dorset. It commences with a profile of the community, its arts sector, and its nascent tourism industry. It then presents findings from a household/business survey designed to gauge resident attitudes towards tourism and provide information on the links that exist between the industry and the arts sector. The data reveal that while residents are supportive of further tourism development there is considerable disagreement among different interest groups about the amount of interaction that should occur between tourism and the local arts sector. In conclusion, the paper outlines some approaches that may allow the linkages between these two important components of the local economy to be strengthened.

In 1946 P.V. Glob published a gazetteer of Eskimo settlement sites in northeast Greenland, and this remains the most comprehensive list to date. Between 1990 and 1994, four expeditions visited a variety of locations between 72 and 75°N and recorded a significant number of new sites. In addition, some of the sites recorded by Glob were revisited, and revisions to his descriptions have been found to be necessary. This article draws attention to the limited archaeological survey work of recent years in the northeast fjords, and reviews the nomenclature used by previous authorities in describing the sites and structures of the region, in particular the so-called ‘mosaics’ or ‘children's playthings.’ It then goes on to offer revisions of some of Glob's descriptions (using Glob's numerical system), and concludes by listing and briefly describing the features of the sites recently discovered.

Geophysical models are usually derived from the idealistic viewpoint that all required external parameters are, in principle, measurable. The models are then driven with the best available data for those parameters. In some cases, there are few measurements available, because of factors such as the location of the phenomena modeled. Satellite imagery provides a synoptic overview of a particular environment, supplying spatial and temporal variability as well as spectral data, making this an ideal source of data for some models. In other cases, although frequent satellite-image observations are available, they are of little use to the modeler, because they do not provide values for the parameters demanded by the model. This paper contains two examples of geophysical models that were derived expressly to utilize measurements and qualitative observations taken from satellite images as the major driving elements of the model. The methodology consists of designing a model such that it can be ‘run’ by numerical data extracted from image data sets, and using the image data for verification of the model or adjustment of parameters. The first example is a thermody namic model of springtime removal of nearshore ice from an Arctic river delta area, using the Mackenzie River as a study site. In this example, a multi-date sequence of AVHRR images is used to provide the spatial and temporal patterns of melt, allowing the required physical observations in the model to be parameterized and tested. The second example is a dynamic model simulating thq evolution of a volcanic ash cloud under the influence of atmospheric winds. In this case, AVHRR images are used to determine the position and size of the ash cloud as a function of time, allowing tuning of parameters and verification of the model.

George Phillips, the naval stores officer at Esquimalt, British Columbia, was responsible for supplying from that base the Canadian Arctic Expedition (1913–1918) led by Vilhjalmur Stefansson. In addition to arranging details of supply in conjunction with directives from his superiors, Phillips travelled with Stefansson by steamer to Nome, Alaska, before Karluk, the brigantine to be used by the southern division of the expedition, sailed on her ill-fated voyage. This article is based on hitherto unused documentation, including the private notebooks and personal correspondence of Phillips. It examines two issues: first, the problems of supply for the Canadian Arctic Expedition, and, second, the personal views of Phillips with respect to Stefansson and other members of the party.

The ‘Okhotsk Sea Ice Observation Experiment’ 93' was carried out in February 1993 in the southern part of the Sea of Okhotsk and in Lake Saroma, Japan. The aim of the experiment was to investigate how effectively Synthetic Aperture Radar (SAR) can monitor sea ice in this region. Satellite data from JERS-1/SAR (J-SAR), ERS-1/SAR CESAR), and SPOT-2/HRV, as well as data from airborne sensors and ground-truth data, were utilized. From the overall analysis of those data, several results were obtained. First, the range of backscatter of the ice cover on Lake Saroma was determined, as well as a relation between ice type and backscatter. Second, a method for making SAR mosaic images was developed to monitor sea ice over a wide area. When comparing J-SAR(L-band) data with E-SAR(C-band) data acquired simultaneously over the same area, J-SAR proved to be superior to E-SAR in showing the existence of sea ice. And third, it was confirmed that the backscatter of E-SAR was correlated to the ice thickness, which may be explained by the relation between the backscatter and the ice-surface temperature.

Since the Antarctic Treaty came into operation, Antarctic affairs have been characterised by international cooperation. The major issues of potential conflict, namely sovereignty, military activity, and mining, have now been largely removed. As a result, the remaining disagreements between parties have been resolved through consultation and negotiation. No dispute has ever found its way to judicial settlement, with most disagreements usually resolved at an early stage through ATCMs. While there is no reason to suspect that the use of consultation and negotiation will not continue, with the introduction of far more comprehensive measures for the protection of the Antarctic environment, combined with the significant increase in activity in and around the continent, there is a greater likelihood of situations occurring that clearly breach these principles or give rise to a dispute. In addition, where extensive damage to the environment has already occurred, negotiation may be limited, so that the other mechanisms for settling disputes must be instituted. The dispute procedures of the Protocol, taken almost entirely from CRAMRA, represent the most comprehensive system for the peaceful settlement of disputes arising in any Antarctic instrument to date. However, clear problems such as remedies, enforcement, and uncertainties with respect to standing and liability remain. Until these problems are resolved, all aspects of all disputes cannot be covered, and comprehensive protection of the Antarctic environment specified in the Protocol will remain an objective, not a reality.

Trends in the annual minimum sea-ice extent, determined by three criteria (absolute annual minimum, minimum monthly mean, and the extent at the end of August), were investigated for the Barents and western Kara seas and adjacent parts of the Arctic Ocean during 1984–1993. Four definitions of ice extent were examined, based on thresholds of ice concentration: >90%, >70%, >40%, and >10% (El, E2, E3, and E4, respectively). Trends were studied using ice maps produced by the Russian Hydro-Meteorological Service, Kosmos and Okean satellite imagery, and data extracted from published literature. During 1984–1993, an increasing trend in the extent of minimum sea-ice cover was observed in the Barents, Kara, and combined Barents–Kara seas, for all ice-extent definitions. Root-mean-square differences between hydro-meteorological ice maps and satellite-image ice classifications for coincident areas and dates were 15.5%, 19.3%, 18.8%, and 11.5%, for ice extensions El–E4, respectively. The differences were subjected to Monte Carlo analyses to construct confidence intervals for the 10-year ice-map trends. With probability p = 0.8, the average 10-year increase in the minimum monthly mean sea-ice extent (followed in brackets by the average increase in the absolute annual minimum ice extent) was 12–46% [26–96%], 31–71% [55–140%], 30–69% [26–94%], and 48–94% [35–108%] in the Barents Sea; 20–60% [32–120%], 10–45% [20–92%], 2–36% [13–78%], and 10–47% [8–69%] in the Kara Sea; and 9–43% [26–59%], 9–41% [30–63%], 8–41% [22–52%] and 15–51% [21–51%] in the combined Barents–Kara seas, for ice concentrations El–E4, respectively. Including published data from 1966–1983, the trend in minimum monthly mean sea-ice extent for the combined 28-year period showed an average reduction of 8% in the Barents Sea and a 55% reduction in the western Kara Sea; ice extent at the end of August showed an average reduction of 33% in the Barents Sea.

Polar-glow aurora is a diffuse type of polar-cap event that follows bombardment of the auroral ionosphere with high-energy protons from ‘cosmic ray’ flares at times of great solar and geomagnetic activity. Observations of five polar glows are presented together with details of the circumstances surrounding their occurrence. The first three glows were associated with enhanced solar activity between 3 and 15 February 1986 and the fourth and fifth glows with enhanced solar activity between 3 December 1993 and 10 February 1994. Despite the fact that the flares associated with the latter solar outburst were much smaller than those associated with the former, both periods of solar activity showed equally marked geophysical, geomagnetic, and auroral activity.

The condylobasal length (CBL) of skulls from 999 sexually mature seal, sealion, and fur seals of 30 different species was measured. Additional data gathered from previous studies were also included to give an indication of variation within each species, particularly where there is a wide geographical dispersion. Where possible, means and ranges of CBL were given separately for each sex, so that the degree of sexual dimorphism could be assessed. Previous studies have indicated that CBL continues to increase after sexual maturity has been reached. In order to assess this, three species (Mirounga leonina, Otaria byronia (flavescens), and Halichoerus grypus) that contained individuals of known age were included in the study. Other craniometric characters are often expressed as a percentage of CBL when assessing taxonomic relationships. Some of these characters were reassessed using the new data.

Investigations on the age and taphonomy of modern and abandoned penguin rookeries were completed in the Antarctic Peninsula region, 1992–1994. Systematic collection and identification of bones from modern rookeries of Adélie (Pygoscelis adeliae), chinstrap (P. antarctica), and gentoo (P. papua) penguins indicate a bias in element preservation for humeri, furcula, femora, and tibiotarsi. More than 73% of the individuals represented by these elements are juveniles. Bones from abandoned rookeries show similar patterns that can help identify old breeding sites and the species that occupied them. Radiocarbon dates completed on 13 chinstrap and Adélie penguin bones, feathers, and eggshell fragments from five abandoned rookeries suggest that occupation of these sites occurred only during warm intervals of the Little Ice Age (AD 1500–1850). These data also provide information on the paleoecology and paleobiogeography of penguins in the Antarctic Peninsula region, which help explain modern distribution patterns and demography.

This paper describes the development of a practical algorithm for the classification of sea-ice types from ERS-1 synthetic aperture radar (SAR) data. The algorithm was based on a combination of grey level and texture information in order to overcome ambiguous grey level values of different ice types. The problem of calculating texture parameters for windows containing more than one ice type was overcome by first segmenting the image so that only pixels from the same segment were included in the calculation of the texture measure. The segmentation procedure was based on the iterative application of a speckle noise reduction filter, and was thus crucially dependent on the ability of such a filter to smooth out noise without destroying edges and fine features. In order to achieve this, a modification to the sigma filter of Lee (1983b) was developed; it out-performed the sigma filter for a model problem. Two ERS-1 SAR scenes of the marginal ice zone east of Spitsbergen in March 1992 were analysed by calculating values of grey level and range for different ice types contained within raw data extracts. Although the grey levels of some of the ice types overlapped, most of the ambiguity was removed through the additional use of range. It was also necessary to test for the wave-like appearance of open water. The classification scheme was demonstrated to identify correctly most of the grease/new ice, first-year ice, multiyear ice, rough ice, pancake ice, and open water in the two SAR scenes, although there was some misclassification of open water as first-year ice.

The general pattern of Antarctic tourism is well known and can be described in terms of numbers of visitors, landing sites, and general activities. However, little is known about the visitors, their behaviour, and other user characteristics. This information is vital for planning effective visitor-management strategies. This article presents and discusses some results from a 1993/94 questionnaire conducted aboard three IAATO member ships and focuses on how visitors rated the behaviour of themselves and others vis-à-vis the IAATO voluntary visitor guidelines. It also identifies how sex, age, educational level, and ship affect guideline violation or adherence. Additionally, passenger responses to hypothetical violations are discussed, which may help to explain why violations occur. This paper stresses not how many violations occur, but why they occur, providing a new insight for future visitor management.

A new emphasis on understanding natural systems at large spatial scales has led to an interest in deriving ecological variables from satellite reflectance images. The normalized difference vegetation index (NDVI) is a measure of canopy greenness that can be derived from reflectances at near-infrared and red wavelengths. For this study we investigated the relationships between NDVI and leaf-area index (LAI), intercepted photosynthetically active radiation (IPAR), and biomass in an Arctic tundra ecosystem. Reflectance spectra from a portable field spectrometer, LAI, IPAR, and biomass data were collected for 180 vegetation samples near Toolik Lake and Imnavait Creek, Alaska, during July and August 1993. NDVI values were calculated from red and near-infrared reflectances of the field spectrometer spectra. Strong linear relationships are seen between mean NDVI for major vegetation categories and mean LAI and biomass. The relationship between mean NDVI and mean IPAR for these categories is not significant. Average NDVI values for major vegetation categories calculated from a SPOT image of the study area were found to be highly linearly correlated to average field NDVI measurements for the same categories. This indicates that in this case it is appropriate to apply equations derived for field-based NDVI measurements to NDVI images. Using the regression equations for those relationships, biomass and LAI images were calculated from the SPOT NDVI image. The resulting images show expected trends in LAI and biomass across the landscape.

The twelfth successive UN session on the ‘Question of Antarctica,’ held at the close of 1994, saw a major change of direction. One brief session of the First Committee, followed by the General Assembly's adoption of resolution A49/80 without a vote, signified the restoration of a consensus approach towards the ‘Question of Antarctica’ for the first time since 1985. Resolution A49/80 stressed the need for Antarctic Treaty Parties (ATPs) to meet commitments undertaken at the 1992 United Nations Conference on Environment and Development, and particularly to continue providing the wider international community with information about Antarctic developments. The ‘Question of Antarctica’ will not be placed on the UN agenda again until 1996, thereby breaking the sequence of annual UN discussions started in 1983. On the surface, consensus was restored, but it is debatable how far the outcome represented merely a papering over of the cracks rather than the basis for an enduring solution to the problems dividing ATPs and their critics. The key point at issue remains the nature and extent of the UN's future role in Antarctic affairs, particularly as ATPs will only accept a limited UN role performed within the context of the Antarctic Treaty System.