bluuebunny/crossref_metadata_2025_split huggingface dataset:
Biomass and leaf-area index maps derived from SPOT images for Toolik Lake and Imnavait Creek areas, Alaska
Authors: Shippert Margaret M. , Walker Donald A. , Auerbach Nancy A. , Lewis Brad E. 
Published: October 2009

AbstractA 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.
Determination of actual snow-covered area using Landsat TM and digital elevation model data in Glacier National Park, Montana
Authors: Hall Dorothy K. , Foster James L. , Chien Janet Y.L. , Riggs George A. 
Published: October 2009

AbstractIn the future, data from the moderate resolution imaging spectroradiometer (MODIS) will be employed to map snow in an automated environment at a resolution of 250 m to 1 km. Using Landsat thematic mapper (TM) data, an algorithm, SNOMAP, has been developed to map snow-covered area. This algorithm will be used, with appropriate modification, with MODIS data following the launch of the first Earth Observing System (EOS) platform in 1998. SNOMAP has been shown to be successful in mapping snow in a variety of areas using TM data. However, significant errors may be present in mountainous areas due to effects of topography. To increase the accuracy of mapping global snow-covered area in the future using MODIS data, digital elevation model (DEM) data have been registered to TM data for parts of Glacier National Park, Montana, so that snow cover on mountain slopes can be mapped. This paper shows that the use of DEM data registered to TM data increases the accuracy of mapping snow-covered area. Using SNOMAP on a subscene within the 14 March 1991 TM scene of northwestern Montana, 215 km2 of snow is mapped when TM data are used alone to map the snow cover. We show that about 1062 km2 of snow are actually present as measured when the TM and DEM data are registered. Approximately five times more snow is present when the effects of topography are considered for this subscene, which is in a rugged area in Glacier National Park. A simple model has been developed to determine the relationship between terrain relief and the amount of correction that must be applied to map actual snow-covered area in Glacier National Park using satellite data alone.
A satellite-based map compared to a traditional vegetation map of Arctic vegetation in the Ny-Ålesund area, Svalbard
Authors: Spjelkavik Sigmund 
Published: October 2009

AbstractAn area of Arctic vegetation on Brøggerhalvøya in the northwestern part of Spitsbergen, was studied. A classified Landsat-TM image with 57 land-cover classes (LCCs) was compared to an existing vegetation map with a comparison matrix. The 57 LCCs were grouped in seven different groups, where the seventh group contained 15 LCCs with vegetation. The other groups were regarded as non-vegetated. The correspondence between the existing vegetation map and the satellite-based vegetation map was not high, but the classes from the satellite-based land-cover map could be interpreted in botanical terms. A vegetation index (VI) was used to discriminate between vegetated and non-vegetated LCCs. The VI was correlated to plant biomass measurements, and the total plant biomass for Brøggerhalvøya was estimated. The estimated biomass coincided with other estimates from the same area.
Antarctic visitor behaviour: are guidelines enough?
Authors: Davis Pamela B. 
Published: October 2009

AbstractThe 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.
Acarine colonisation of Antarctica and the islands of the Southern Ocean: the role of zoohoria
Authors: Pugh P.J.A. 
Published: October 2009

AbstractA quarter of the terrestrial Acari recorded from Antarctica and the sub-Antarctic islands are parasitic haematophages or non-feeding phoretics associated with other larger and more mobile animals, especially sea birds and pterygote insects. Although flying sea birds are effective vectors of zoohoric mites into the region, penguins are not and merely serve as reservoir hosts. Similarly, most of the mites associated with insects were accidentally introduced by man as free-living adults that subsequently utilised a range of alien and indigenous insects as local dispersal mechanisms.
The Arctic shipFox
Authors: Erskine Angus B. , Kjaer Kjell-G. 
Published: October 2009

AbstractThe shipFox, built in Aberdeen in 1855 as a yacht, was used by Francis Leopold McClintock on his successful search for relics of Sir John Franklin's lost expedition. She was then chartered for one summer for Allen Young and John Rae to survey a route for a trans-Atlantic cable via the Faeroes, Iceland, and Greenland, after which she was in the services of the Kryolith Mine og Handelsselskabet, based at Ivigtut, southwest Greenland, for many years. In 1905, under charter, she made a historically significant voyage to Thule in northwest Greenland. After this she was owned by the Kongelige Grønlanske Handel and used for coastal freighting, until in 1912 she was condemned and abandoned in Qeqertarsuaq (Godhavn) Harbour, where remnants may be seen today.
‘…which an affectionate heart would say’: John Franklin's personal correspondence, 1819–1824
Authors: Davis Richard C. 
Published: October 2009

AbstractPersonal letters written by John Franklin to his relatives and friends between 1819 and 1824 reveal the Admiralty's 1819–1822 overland expedition from a unique perspective. All the official journals of that expedition have been published, as have the most important pieces of correspondence between Franklin and the Admiralty, the Colonial Office, and fur-trade officers. Previously unpublished personal correspondence, however, offers the possibility of a more candid response, as well as an opportunity to view the experience from an altered position. In these personal communications, Franklin sometimes expresses opinions that contradict those that appear in his public narrative and official records. But more importantly, they help construct an image of Franklin's personality around the time of his first overland expedition. The letters reveal a modest man with close familial attachments and a strong sense of personal relationships, in spite of the increasingly technological nature of his subsequent Arctic undertakings.
An international environmental regime for the Antarctic: critical investigations
Authors: van der Lugt Cornelis 
Published: October 2009

AbstractSince the late 1970s, theorists in the field of international relations have increasingly used the concept ‘international regime’ in their attempts to give content to the idea of international governance. The concept was adopted from international lawyers, and this has led to some confusion when analysts apply terminology differently. Analysis of Antarctic politics is no exception. This article seeks to illustrate how the theory of international regimes can be applied to the Antarctic Treaty System (ATS). The focus is on the events of the 1980s, during which international awareness (or perception) of a global environmental crisis severely tested the robustness of ‘the Antarctic regime’ (that is, the ATS). Three approaches to regime formation and change or transformation are considered in an attempt to explain the rejection of the Convention for the Regulation of Antarctic Mineral Resource Activities and the acceptance of the 1991 Protocol on Environmental Protection to the Antarctic Treaty. The three approaches employed are game theory, functional theories, and cognitive explanations. The evolution of a new epistemic consensus on the value and the future of the Antarctic crystallises, signifying a key role on the part of natural scientists and environmental non-governmental organisations. It is concluded that the ATS as a whole can today be described as an international environmental regime.
Karl Ernst von Baer and the Kara Sea ‘Eiskeller’
Authors: Tammiksaar Erki , Stone Ian R. 
Published: October 2009

AbstractKarl Ernst von Baer coined the word ‘Eiskeller’ (ice-cellar) to describe the Kara Sea in 1837, but he did not define precisely what he meant. The word was seized upon by subsequent geographers, notably Friedrich B. Lütke and August Petermann, as implying that the sea was unnavigable. However, when numerous successful voyages — by Norwegian fishermen, Joseph Wiggins, and Adolf Erik Nordenskiöld — showed that this was not the case, it was Baer, and not Lütke or Petermann, who was criticised for the claim. Baer only defended himself against these allegations in 1876, the year of his death, 39 years after he had first used the term.
The polar ship Quest
Authors: Erskine Angus B. , Kjaer Kjell-G. 
Published: October 2009

AbstractSir Ernest Shackleton bought the Norwegian sealer Foca 7 in 1921 for his third Antarctic expedition and renamed it Quest. He died aboard the ship in South Georgia in January 1922, but Frank Wild took over the leadership and completed the expedition after the delayed start. The vessel returned to Norwegian ownership in 1923 but kept the name Quest. In the 1920s and 1930s, in-between sealing voyages, she was chartered out for various scientific or hunting expeditions, mostly to S valbard or the east coast of Greenland, during which many well-known explorers trod her decks, including Gunnar Isachsen, Gino Watkins, Augustine Courtauld, John Rymill, Count Eigil Knuth, Lawrence Wager, H.W. Ahlmann, Gaston Micard, Paul-Emile Victor, and John Giaever. Vital assistance was given in rescuing the survivors of the Italian airship Italia in 1928, of the Danish ship Teddy in 1924, and of several sealers at different times. Many sailors owed their lives to this little ship, which was owned by the Schjelderup family and for most years captained by Ludolf Schjelderup, who gained international fame as an expert ice pilot. On one occasion, 1936–37, the vessel overwintered at Loch Fyne in northeast Greenland. In April 1940, when the Germans invaded Norway, Quest was sealing off Newfoundland. Allied naval forces took possession of her and she was used in various capacities in Canada, Bermuda, and UK coastal waters for the rest of the war. After the war, she once again returned to the sealing business under Norwegian ownership until finally coming to grief in the ice just north of Newfoundland and sinking on 5 May 1962.
Diversity and abundance of soil algae in the polar desert, Sverdrup Pass, central Ellesmere Island
Authors: Elster Josef , Lukesová Alena , Svoboda Josef , Kopecky Jirí , Kanda Hiroshi 
Published: October 2009

AbstractCyanobacteria and eukaryotic algae were investigated during three seasons in 18 plots established across Sverdrup Pass valley of central Ellesmere Island, 79°N, Canada. The sites differed in altitude, substratum, and other characteristics. A high species diversity totalled 136 taxa. Cyanobacteria accounted for 52 and eukaryotic algae 84 species. In both groups, numerous species did not correspond to any taxa described. However, high diversity did not always coincide with high algal abundance or biomass. On older and stable landscapes, visible crusts developed, containing mostly cyanobacteria, fungi, and other microbial components. Considerable variation in algal diversity and abundance was found among the sites. Also the southern, granitic portion of the pass was richer in green algae compared to its northern, dolomitic portion where motile cyanobacteria were more prominent. These micro-autotrophs occupied the soil profile to a depth of 7 cm. Their highest density was not at the surface but at 3–4 cm depth. One plot was contaminated by windblown copper-rich dust from a nearby outcrop and soil here was poorest in content of photosynthetic pigments, suggesting a local heavy-metal toxicity.
The Northern Sea Route, 1998
Authors: Brigham Lawson W. 
Published: October 2009

AbstractBy any measure, 1998 was a year of conflicting domestic and international interests regarding Russia's Northern Sea Route (NSR). The European Union sponsored an international demonstration project using a Finnish tanker during an April and May voyage to the Kara Sea. Russian icebreakers escorted the tanker, which carried a cargo of gas condensate from the Ob estuary to Europe. The International NSR Programme (INSROP) continued during a fifth year of interdisciplinary research concentrating on the integration of previous results and NSR voyage simulations. Lukoil and Gazprom forged ahead with building their own tanker fleets, while advertisements appeared in the Russian press protesting the use of foreign carriers in the Russian Arctic. In November Lukoil-affiliate companies acquired more than 50% interest in Murmansk Shipping Company, making Lukoil owner of 13% of the Russian merchant marine. Difficult escort operations through heavy ice were conducted late in the year so that Pevek would be supplied with adequate fuel to survive the coming winter.
Biological activity on a decaying caribou antler at Cape Herschel, Ellesmere Island, Nunavut, high Arctic Canada
Authors: Sutcliffe Antony J. , Blake Weston 
Published: October 2009

AbstractIn the polar desert of the high Arctic, underlain by continuous permafrost and commonly snow-covered for much of the year, the paucity of plant growth might seem unsurprising. Although low temperatures and lack of moisture exert a strong influence on plant life and can greatly diminish the rate at which plants can grow, these are nevertheless not the only factors involved. Lack of mineral nutrients, in an environment where chemical weathering is inhibited, may play an even greater part. In consequence, where nutrient-rich decaying animal bones are present, it is not uncommon to find growing upon them a luxuriant vegetation of mosses and vascular plants, together with less spectacular algae and lichens, which show up in striking contrast to the barren ground around them. These microhabitats, in turn, carry their own fauna of invertebrates. This paper examines, in detail, one such specimen and its flora and fauna — a 2000-year-old shed caribou antler from the ground surface at Cape Herschel, Ellesmere Island, 78°N.
Winter navigation in the Northern Sea Route using RADARSAT data
Authors: Alexandrov Vitali Yu. , Sandven Stein , Johannessen Ola M. , Pettersson Lasse H. , Dalen Øyvind 
Published: October 2009

AbstractThe results are presented of the first winter ice navigation demonstration, using synthetic aperture radar (SAR) images from the Canadian satellite RADARSAT, onboard the nuclear icebreaker Sovetskiy Soyuz in the Kara Sea region in April–May 1998. While ERS SAR data only could cover part of the sea ice in this large area, the demonstration showed that RADARSAT ScanSAR images with 100 m pixel size could be used to map all relevant ice areas with a few 500 × 500 km scenes. SAR images transferred onboard icebreakers in near real time offer an excellent possibility to select optimal sailing routes in difficult ice conditions such as those that were encountered by this expedition. SAR images were also used for planning of operations prior to the expedition. This study compares sub-satellite sea-ice observations with RADARSAT SAR as well as Okean side-looking radar (SLR) signatures of the major ice types and features found in the Kara Sea during winter. Wide-swath SAR images will become available from several new satellites in the near future, such as Envisat, scheduled in 2001, and RADARSAT-2, in 2002. Satellite SAR images will therefore play an increasingly important role in operational ice monitoring both in the Northern Sea Route and in other ice areas.
Harpoon guns, the lost Greenland settlement, and penal colonies: George Manby's Arctic obsessions
Authors: Barr William 
Published: October 2009

AbstractGeorge William Manby (1766–1854) was an English inventor best known for his idea of firing a line from shore to a wrecked ship so that the crew might be saved by means of a breeches-buoy. Around 1819 he turned his attention to new typesof whaling harpoons, bothahand harpoon andagun harpoon. In 1821 he went on a voyage to the Greenland whaling grounds on boardBaffin, Captain William Scoresby Jr, with the aim of trying out his inventions, but the experiments were foiled by the reluctance of the crew to cooperate. As a result of that voyage, Manby espoused three ideas that he pursued obsessively for the rest of his life: that there might still be Norse survivors in the so-called ‘Lost Colony’ in East Greenland; that Britain should claim the area of East Greenland north of the area claimed by Denmark; and that this area should be developed as a penal colony.
Contributions of traditional knowledge to understanding climate change in the Canadian Arctic
Authors: Riedlinger Dyanna , Berkes Fikret 
Published: October 2009

AbstractDespite much scientific research, a considerable amount of uncertainty exists concerning the rate and extent of climate change in the Arctic, and how change will affect regional climatic processes and northern ecosystems. Can an expanded scope of knowledge and inquiry augment understandings of climate change in the north? The extensive use of the land and the coastal ocean in Inuit communities provides a unique source of local environmental expertise that is guided by generations of experience. Environmental change associated with variations in weather and climate has not gone unnoticed by communities that are experiencing change firsthand. Little research has been done to explore the contributions of traditional knowledge to climate-change research. Based in part on a collaborative research project in Sachs Harbour, western Canadian Arctic, this paper discusses five areas in which traditional knowledge may complement scientific approaches to understanding climate change in the Canadian Arctic. These are the use of traditional knowledge as local-scale expertise; as a source of climate history and baseline data; in formulating research questions and hypotheses; as insight into impacts and adaptation in Arctic communities; and for long-term, communitybased monitoring. These five areas of potential convergence provide a conceptual framework for bridging the gap between traditional knowledge and western science, in the context of climate-change research.
Wilderness and aesthetic values in the Antarctic
Authors: Codling Rosamunde 
Published: October 2009

AbstractIn Article 3 of the 1991 Protocol on Environmental Protection to the Antarctic Treaty, the Antarctic Treaty Consultative Parties committed themselves to ‘the protection of the Antarctic environment…and the intrinsic value of Antarctica, including its wilderness and aesthetic values.’ The phraseology of the Protocol requires clarification. ‘Wilderness and aesthetic values’ links two disparate concepts, best handled by separation. Annex V, Article 3, of the Protocol covers many topics, and their assessment must be by a composite of frameworks specifically designed for the different purposes set out in the Annex.A working definition of wilderness in the Antarctic is suggested: ‘Any part of the Antarctic in which neither permanent habitation nor any other permanent evidence of present or past human presence is visible.’ Using this, a very high proportion of the continent will be recognised as having wilderness status. The phrase ‘aesthetic values’ should be seen as part of a wider process—Landscape Character Assessment—that is at present unknown to most in the Antarctic community. It is based on the principle of objective description and classification of landscape character. This basic characterisation can then be put to different uses, one of which may be to make more subjective judgements or evaluations that lead to area designations.
A high temporal resolution data set of ERS scatterometer radar backscatter for research in Arctic and sub-Arctic regions
Authors: Sheng Yongwei , Smith Laurence C. , Frey Karen E. , Alsdorf Douglas E. 
Published: October 2009

AbstractRadar backscatter in Arctic and sub-Arctic regions is temporally dynamic and reflects changes in sea ice, glacier facies, soil thaw state, vegetation cover, and moisture content. Wind scatterometers on the ERS-1 and ERS-2 satellites have amassed a global archive of C-band radar backscatter data since 1991. This paper derives three high temporal resolution data products from this archive that are designed to facilitate scatterometer research in high-latitude environments. Radar backscatter data have a grid spacing of 25 km and are mapped northwards from 60°N latitude over intervals of one, three, and seven days for the period 1991–2000. Data are corrected to a normalized incident angle of 40°. Animations and full-resolution data products are freely available for scientific use at http://merced.gis.ucla.edu/scatterometer/index.htm.
The contributions of Karl Ernst von Baer to the investigation of the physical geography of the Arctic in the 1830s–40s
Authors: Tammiksaar Erki 
Published: October 2009

AbstractAlthough more widely known as the founder of modern embryology, Karl Ernst von Baer played a special role in the investigation of the physical geography of the Russian Empire in the nineteenth century. Baer not only conducted his own scientific research in the Arctic, he was also a key supporter and organiser of other Russian expeditions to the far north. Baer carried out the first investigations of the physical geography, flora, and fauna of Novaya Zemlya, and it was due to his work that the first precise data on the climate of the Russian Arctic appeared in the scientific literature in Europe. He can also be considered the founder of geocryology, as he not only wrote the first theoretical survey on Siberian permafrost, but was the initiator and organiser of the first expedition, under the leadership of Alexander Theodor von Middendorff, that was launched with the task of studying that phenomenon in Siberia. Baer was instrumental in the restoration of the tradition of Russian Arctic exploration, which had died out at the end of the eighteenth century; it was at his initiative that the Russian Geographical Society — which later became the leader in Russian Arctic exploration — was founded in 1845.