Blar i Bergen Open Research Archive på forfatter "Johannessen, Ola M."
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Analysis of merged SMMR-SSMI time series of Arctic and Antarctic sea ice parameters 1978-1995
Bjørgo, Einar; Johannessen, Ola M.; Miles, Martin W. (Journal article; Peer reviewed, 1997-02-15)The most consistent means of investigating the global sea ice cover is by satellite passive microwave sensors, as these are independent of illumination and cloud cover. The Nimbus 7 Scanning Multichannel Microwave Radiometer ... -
Arctic climate change: observed and modelled temperature and sea-ice variability
Johannessen, Ola M.; Bengtsson, Lennart; Miles, Martin W.; Kuzmina, Svetlana I.; Semenov, Vladimir A.; Alekseev, Genrikh V.; Nagurnyi, Andrei P.; Zakharov, Victor F.; Bobylev, Leonid P.; Pettersson, Lasse H.; Hasselmann, Klaus; Cattle, Howard P. (Tellus A 56A(4), Peer reviewed; Journal article, 2004-07-09)Changes apparent in the arctic climate system in recent years require evaluation in a century-scale perspective in order to assess the Arctic's response to increasing anthropogenic greenhouse-gas forcing. Here, a new set ... -
Arctic sea ice and climate change - will the sea ice disappear in this century?
Johannessen, Ola M.; Miles, Martin W. (Peer reviewed; Journal article, 2000) -
Barents Sea seasonal ice zone features and processes from ERS 1 synthetic aperture radar: Seasonal Ice Zone Experiment 1992
Sandven, Stein; Johannessen, Ola M.; Miles, Martin W.; Pettersson, Lasse H.; Kloster, Kjell (Journal article; Peer reviewed, 1999-07-15)Sea ice features and processes in the Barents Sea were studied during the Seasonal Ice Zone Experiment 1992 (SIZEX92), a dedicated ERS 1 satellite synthetic aperture radar (SAR) field campaign carried out in March 1992. ... -
Climate change in the North – past, present and future
Thiede, Jörn; Johannessen, Ola M. (Episodes: Journal of International Geoscience, Journal article, 2008-03)The Nordic countries have produced famous polar explorers and researchers who have generated climate research schools at a variety of locations. The dependence of these countries with respect to the lifelihood of their ... -
Coastal ocean fronts and eddies imaged with ERS 1 synthetic aperture radar
Johannessen, Johnny A.; Shuchman, Robert A.; Digranes, G.; Lyzenga, D. R.; Wackerman, C.; Johannessen, Ola M.; Vachon, P. W. (Peer reviewed; Journal article, 1996-03-15)ERS 1 C band synthetic aperture radar (SAR) data were collected during the Norwegian Continental Shelf Experiment (NORCSEX) both in November 1991 during the ERS 1 commissioning phase and at different seasons in 1992 and ... -
Coastal wind field retrievals from ERS synthetic aperture radar images
Korsbakken, E.; Johannessen, Johnny A.; Johannessen, Ola M. (Journal article; Peer reviewed, 1998-04-15)A unique series of European Remote Sensing Satellite (ERS) 1 and 2 C band synthetic aperture radar (SAR) images was obtained off the southern coast of Norway during the Coast Watch’95 experiment in September 1995. In this ... -
COASTWATCH´95: ERS 1/2 SAR detection of natural film on the ocean surface
Espedal, Heidi A.; Johannessen, Ola M.; Johannessen, Johnny A.; Dano, E.; Lyzenga, D. R.; Knulst, Johan (Peer reviewed; Journal article, 1998-10-15)Ocean mesoscale phenomena such as eddies and current convergence zones can often be seen in synthetic aperture radar (SAR) images due to characteristic patterns caused by natural film induced damping of the waves. Such ... -
Convective chimneys and plumes in the Northern Greenland Sea
Johannessen, Ola M.; Lygre, Kjetil; Eldevik, Tor (Geophysical Monograph Series;30, Chapter, 2005)In the Boreas Basin in the northern Greenland Sea, convection has been observed to be localized as narrow structures - chimneys - in which the water masses may be homogeneous from the surface through great depths. An ... -
Cover ERS-1/2 SAR monitoring of dangerous ice phenomena along the western part of Northern Sea Route
Johannessen, Ola M.; Sandven, Stein; Kloster, Kjell; Pettersson, Lasse H.; Melentyev, V. V.; Bobylev, Leonid P.; Kondratyev, K. Ya. (Journal article, 1997-08-01) -
Cover ERS-1/2 SAR monitoring of dangerous ice phenomena along the western part of Northern Sea Route
Johannessen, Ola M.; Sandven, Stein; Kloster, Kjell; Pettersson, Lasse H.; Melentyev, V. V.; Bobylev, Leonid P.; Kondratyev, K. Ya. (Journal article; Peer reviewed, 1997-08-01) -
Critical vulnerabilities of marine and sea ice–based ecosystems in the high Arctic
Johannessen, Ola M.; Miles, Martin W. (Peer reviewed; Journal article, 2010-12-01)The objectives of this paper are to summarise: (1) observed 20th-century and projected 21st-century changes in key components of the Arctic climate system and (2) probable impacts on the Arctic marine environment, with ... -
Decreasing Arctic Sea Ice Mirrors Increasing CO2 on Decadal Time Scale
Johannessen, Ola M. (Atmospheric and Oceanic Science Letters, Journal article, 2008-11-16)Arctic sea ice is a keystone indicator of greenhouse-gas induced global climate change, which is expected to be amplified in the Arctic. Here we directly compare observed variations in arctic sea-ice extent and CO2 since ... -
An ERS 1 synthetic aperture radar image of atmospheric lee waves
Vachon, P. W.; Johannessen, Ola M.; Johannessen, Johnny A. (Journal article; Peer reviewed, 1994-11-15)An ERS 1 synthetic aperture radar (SAR) image of the island Hopen shows a distinct 7.6-km wavelength wave phenomenon near the island. This wave phenomenon is interpreted as the surface imprint on open water of atmospheric ... -
Greenland Ice Sheet Elevation Ehange in Winter and Influence of Atmospheric Teleconnections in the Northern Hemisphere
Chen, Lin-Ling; Johannessen, Ola M.; Khvorostovsky, Kirill; Wang, Huijun (Journal article, 2009-11-16) -
Greenland Sea Odden sea ice feature: Intra-annual and interannual variability
Shuchman, Robert A.; Josberger, Edward G.; Russel, Catherine A.; Fischer, Kenneth W.; Johannessen, Ola M.; Johannessen, Johnny A.; Gloersen, Per (Journal article; Peer reviewed, 1998-06-15)The “Odden” is a large sea ice feature that forms in the east Greenland Sea that may protrude eastward to 5 °E from the main sea ice pack (at about 8 °W) between 73° and 77 °N. It generally forms at the beginning of the ... -
High northern latitude surface air temperature: comparison of existing data and creation of a new gridded data set 1900–2000
Kuzmina, Svetlana I.; Johannessen, Ola M.; Bengtsson, Lennart; Aniskina, Olga G.; Bobylev, Leonid P. (Peer reviewed; Journal article, 2008-03)Detection, attribution and understanding of temperature changes in the high northern latitudes depend on constraining uncertainties and resolving apparent discrepancies in observational data sets. We quantitatively compare ... -
High-frequency internal wave observations in the marginal ice zone
Sandven, Stein; Johannessen, Ola M. (Journal of Geophysical Research: Oceans;92(C7), Journal article, 1987-06-30) -
Indian Ocean: Validation of the Miami Isopycnic Coordinate Ocean Model and ENSO events during 1958–1998
Haugen, Vibeke E.; Johannessen, Ola M.; Evensen, Geir (Journal article, 2002-05-25)In the Indian Ocean, in situ data are sparse both in time and space. Therefore, numerical models are one of the major tools for further understanding of the ocean circulation. We have implemented, validated, and done a 40 ... -
Mesoscale modeling study of the oceanographic conditions off the southwest coast of India
Haugen, Vibeke E.; Johannessen, Ola M.; Evensen, Geir (Journal article; Peer reviewed, 2002-09)A high resolution model, using the Miami Isopycnic Coordinate Ocean Model (MICOM), has been implemented for the first time to study the seasonal circulation and coastal upwelling off the southwest Indian coast during 1974. ...