Search for dissertations about: "antarctic"

Showing result 16 - 20 of 52 swedish dissertations containing the word antarctic.

  2. 16. On Numerical Tracer Advection in the Stratosphere and Assimilation of Data from Satellites

    Author : JOHN RÖSEVALL; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; stratosphere; transport modelling; O3; ozone depletion; data assimilation;

    Abstract : Since the early 1980's, large scale ozone depletion has been observed in the lower regions of the ozone layer over Antarctica when sunlight returns to the polar region in the early spring. The destruction of ozone is attributed to anthropogenic emissions of freon and halon compounds that have augmented the natural stratospheric concentrations of nonreactive Clx and Brx reservoir species with several hundred percent. READ MORE

  4. 17. Decadal analysis of stratospheric ozone depletion using data assimilation and Odin/SMR measurements

    Author : Kazutoshi Sagi; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; ozone loss; remote sensing; stratosphere; limb sounding; data assimilation;

    Abstract : Serious ozone depletion has been measured every Antarctic spring since the early 80’s. This ozone depletion is considered to be a result of photo-chemical reactions and catalytic cycles resulting from anthropogenic halogen containing gases. facilitated by the formation of Polar Stratospheric Clouds (PSCs). READ MORE

  5. 18. Human Pathogens and Antibiotic Resistant Bacteria in Polar Regions

    Author : Jorge Hernández; Björn Olsen; Lotta Berg; Uppsala universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; ESBL; Antibiotic Resistance; Polar Regions; Wild Birds; Mikrobiologi; Microbiology;

    Abstract : Coincident with human activity in recent decades, human-associated microorganisms have arrived to the Antarctic region, possibly linked to increasing presence of scientific bases and ship-borne tourists. In the Arctic, humans have been present for a very long time, and the few parts of the Arctic without human activities is decreasing with time. READ MORE

  6. 19. Analysis of stratospheric ozone depletion in the Arctic using a data assimilation technique

    Author : Kazutoshi Sagi; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; data assimilation; ozone loss; limb sounding; remote sensing; stratosphere;

    Abstract : Serious ozone depletion has been measured every Antarctic spring since the early 80’s. This ozone depletion is considered to be a result of photo chemical reactions and cat- alytic cycles resulting from anthropogenic halogen containing gases. READ MORE

  7. 20. The zoo-geomorphological impact of fossorial rodents in sub-polar alpine environments

    Author : Bert Eriksson; Jan Boelhowers; John Östh; Hanna Ridefelt; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; zoo-geomorphology; fossorial rodents; sub-polar; alpine; geomorphic work; ecosystem engineers; Physical geography; Naturgeografi; Geography; Geografi;

    Abstract : The geomorphological impact of small fossorial mammals (adapted to digging and living underground), such as rodents can be significant, and both their direct and indirect effects may contribute to landscape formation. This thesis is based on empirical field studies of two burrowing rodent species in sub-polar environments, namely invasive House mice (Mus musculus) on sub-Antarctic Marion Island and Norwegian lemmings (Lemmus lemmus) in sub-Arctic Abisko. READ MORE