In Norway's Arctic, meteorologists have a first-row seat to climate change
At 66, Robertsen retired after enduring spartan conditions during missions that totalled eight years on two islands of the Svalbard archipelago: Bjornoya (Bear Island) and Hogen.
To reach the remote Bjornoya, where the only humans are the nine employees of the small weather station, the meteorologists have to fly in by helicopter as they are rotated on a six-month basis.
'The idea is to not stay too long, because it's a different rhythm, and you are isolated,' Robertsen told AFP.
It is demanding work.
'It's a 24/7 occupation,' he said. 'We are doing it all day, all night.' The team worked shifts to cover all hours of the day, he explained.
Weather observation starts in the early morning at 6:00 am.
'It's manually done, then you have to go outside and check the bucket that is collecting precipitation,' said Robertsen.
'During wintertime you have to melt the snow and ice into water' to determine how much has fallen.
The data is then transmitted the Norwegian Meteorological Institute in Tromso and Oslo.
'This tiny little observation is actually quite crucial for the weather forecasting systems up north, because observations are so sparse from that area.'
Bjornoya sits in the middle of fishing grounds, and the weather reports published twice a day are closely followed by the fishing boats in the area.
Since his first missions to the Arctic in the 1990s, Robertsen has witnessed the changing climate.
'When I started going up north, there was a lot of ice. In the later years, it's less ice and fewer polar bears. You can see the climate change,' he said.
Polar bears have been classified as a vulnerable population since 1982 on the IUCN (International Union for Conservation of Nature) Red List of Threatened Species, with the loss of Arctic sea ice the most pressing threat against the species.
However, their precise numbers, are almost impossible to assess.
In winter, employees of station always venture out in pairs and have to be armed due to the presence of polar bears, but according to Robertsen it's rarer to encounter them today.
In April, during his last mission to the island, Robertsen had an accident while doing carpentry: he slipped and ended up cutting one finger clean off and half of another.
Due to tough weather conditions, he had to wait some 26 hours before being evacuated by helicopter and transported to a hospital.
'It was a heavy snowstorm coming in, only the day after the helicopter came,' he recounted.
Looking back, Robertsen does not regret the years spent under the austere living conditions.
'The Arctic has given me so many experiences and memories so it is a small fee to pay back with my left little finger and part of my ring finger,' he said.
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