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  • 1
    Electronic Resource
    Electronic Resource
    Census of breeding Antarctic Petrels Thalassoica antarctica and physical features of the breeding colony at Svarthamaren, Dronning Maud Land, with notes on breeding Snow Petrels Pagodroma nivea and South Polar Skuas Catharacta maccormicki (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 6 (1988), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: Only about a dozen breeding colonies of the Antarctic Petrel Thalassoica antarctica are known, all confined to the Antarctic continent. In 1985 one of the largest colonies, situated in Muhlig-Hofmannfjella, Dronning Maud Land, c. 200 km from the open sea and at an elevation of 1600 m a.s.l. was censused around the time of hatching. The colony size was estimated at about 207,000 breeding pairs. Three minor colonies were discovered at Jutulsessen, Gjelsvikfjella.Microclimatic measurements were made to evaluate the physical environment experienced by the breeding petrels and their chicks in the hostile Antarctic climate. The temperatures measured and energy budget made for the hillside, where the colony was located, showed that the nests of the Antarctic Petrel are placed at relatively favourable places. The northeast facing slope with the Antarctic Petrel colony absorbed large quantities of shortwave radiation during the birds’breeding season and provided suitable microclimatic conditions for breeding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.1988.tb00576.x
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Microclimates and water budget of algae, lichens and a moss on some nunataks in Queen Maud Land (1989)
    Springer
    International journal of biometeorology 33 (1989), S. 272-281 
    Details
    ISSN: 1432-1254
    Keywords: Microclimate ; Water budget ; Vegetation ; Antarctica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract During the Norwegian Antarctic Expedition of 1984–1985, land parties worked in the area of Mühlig-Hofmannfjella and Gjelsvikfjella in Queen Maud Land (5° 20′E, 1° 37′W, 1000–1600 m a.s.l.). The nunataks in this area, which represents one of the climatic limits for terrestrial life on earth, is among those areas absorbing the highest quantity of shortwave radiation during a period of 24 h in summer. In spite of this the air temperature never, or very seldom, exceeds 0° C. The limiting factor for photosynthesis over most of the summer was water availability. Melt-water plays an important role in spring. During rest of the growth season, water from condensation is probably the most important water source for plants. On calm nights the rate of condensation during 6 h may reach 0.5 mm, which constitutes only 10%–30% of daily potential evapotranspiration. Plants situated in narrow clefts or shielded by stone blocks have the highest rate of potential photosynthesis. These locations are shielded from direct solar radiation most of the time, but the radiation from surrounding stone surfaces is higher than from the atmosphere and heat loss by turbulence is smaller than for exposed locations. These locations also probably have the highest rate of actual photosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01051089
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Mass-balance rates derived by mapping internal tephra layers in Mýrdalsjökull and Vatnajökull ice caps, Iceland (2005)
    International Glaciological Society
    In:  Annals of Glaciology, 42 (1). pp. 284-290.
    Details
    Publication Date: 2015-07-16
    Description: Internal tephra layers of known age have been detected by radio-echo soundings within the Mýrdalsjökull and Vatnajökull ice caps in Iceland. Assuming steady state, the estimated strain rates since these isochrones were deposited on the glacier surface have been used to calculate past average specific net balance rates in the accumulation zones along three flowlines on Mýrdalsjökull and one on Vatnajökull. For the period 1918–91 the specific mass-balance rate has been estimated to 4.5 and 3.5 m a−1 at 1350 m a.s.l. on the southern and northern slopes of Mýrdalsjökull, respectively. At 1800 m elevation on the Bárdarbunga ice dome in Vatnajökull, the specific net balance averaged over the last three centuries is estimated to be about 2.1 m a−1. Given this specific net balance, a revised age–depth timescale is presented for a 400 m deep ice core recovered in 1972 from Bárdarbunga. The ice at the bottom is estimated to be from AD 1750.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3189/172756405781813078
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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