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IEEE publication on comparison of microwave sea ice retrieval algorithms

Eleven algorithms for the passive-microwave measurement of sea-ice were implemented and inter-compared. Daily, monthly and annual Arctic sea-ice concentration, area and extent were calculated by the algorithms using daily microwave brightness temperatures from SMMR, SSM/I, and SSMIS for the period 1979–2012.

  • Posted by admin
  • Published: 2014-04-28

Arctic ROOS Annual meeting 2013

  • Posted by admin
  • Published: 2013-12-16

Arctic Ice Data from NSIDC temporary unavailable after October 2, 2013

Due to the U.S. federal government shutdown, the source SSMI data from NSIDC is not currently available.

  • Posted by admin
  • Published: 2013-10-08

50 per cent increase in the annual minimum of the sea ice area in the Arctic

The ArcticROOS system observed the annual minimum of sea ice area in the Arctic at 4,588 million square kilometres on 11th September 2013. The sea ice area this year is about 50 percent larger than the minimum record reported a year ago on 9th September 2012. In 2012 the minimum sea ice area was record low at 2.97 million square kilometres.

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  • Published: 2013-09-30

The cold war: how sea ice impacts on Arctic operations

Ice floes forced Shell to stop drilling operations in the Arctic and the threat is set to escalate as summer sea ice disappears at an accelerated rate. Julian Turner from talks to Professor Ola M. Johannessen of the Nansen Environmental and Remote Sensing Centre about climate change, satellite monitoring technology and why the offshore industry is playing catch-up when it comes to sea ice prediction.

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  • Published: 2013-09-02

New minimum ice area record

Nansen Center’s European Ice Information Service "" shows a new ice area minimum record of approx. 3 million square kilometers on the 9th September 2012, 0.6 million square kilometers less than the previous record in 2007 (see Figure 1). From the Nansen Center's "Hovercraft" expedition, led by Professor Yngve Kristoffersen, it is reported that the air temperature on 9th September was -2 degrees at 84 degrees north, 3 degrees east - that is, the melt season is over.

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  • Published: 2012-09-12

New record minimum ice extent in the Arctic and it is still melting rapidly

A record minimum sea ice area in the Arctic is observed now in August 2012 and the ice is still melting rapidly. The ice area is recorded to be 3,26 million square kilometres on 26th August (see figure below), while the previous record sea ice area minimum was 3.64 million square kilometres, reported in 2007. Also a record minimum ice extent (i.e. the ice edge position, see lower figure) is observed at 4.64 million square kilometres, which is significantly less than previous minimum (4,73 million km2) reported on 19th September 2007. The observations are based on the information published at the Nansen Center’s European ice information service, published here at Arctic-ROOS..

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  • Published: 2012-08-27

Arctic sea ice shrinks to record low, by some estimates

The Arctic sea ice area is now more than 300.000 km2 less than the earlier minimum in 2007.

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  • Published: 2012-08-24

Arctic ROOS Annual Meeting 2-3 November 2011

Hosted by University of Cambridge, Department of Applied Mathematics and Theoretical Physics (UCAM DAMTP) (e-mail: "P. Wadhams" <>)

  • Posted by webadmin
  • Published: 2011-10-24

ERS satellites has observed the Earth during 20 years

The European ERS-1 satellite was launched in 1991 and the ERS-2 satellite followed in 1995. Both satellites have provided Earth observation data that has been essential for the scientific research performed at the Nansen Center during the last 20 years.

  • Posted by webadmin
  • Published: 2011-10-03

Publication on the Interaction Between the Warm Subsurface Atlantic Water in the Sermilik Fjord and Helheim Glacier in Southeast Greenland

The Nansen Center scientists Ola M. Johannessen, Alexander Korablev, Victoria Miles, Martin Miles and Knut E. Solberg have published the paper "Interaction Between the Warm Subsurface Atlantic Water in the Sermilik Fjord and Helheim Glacier in Southeast Greenland" in Surveys in Geophysics.

  • Posted by webadmin
  • Published: 2011-08-11

Special issue on the Earth’s Cryosphere and Sea Level Change

The International Space Science Institute (ISSI) workshop on the Earth’s Cryosphere and Sea Level Change was hosted in Bern in March 2011. The main results from the workshop are now published on-line in the special issue of “Surveys in Geophysics”.

  • Posted by webadmin
  • Published: 2011-07-04

Award for international space cooperation

The Norwegian Space Centre has presented an award to Prof. Ola M. Johannessen for his scientific contribution to increase international awareness and understanding of space activities – in particular for Earth observation.

  • Posted by webadmin
  • Published: 2011-05-16