EGU Guest blogger

Image of the Week: Atmospheric CO2 from ice cores

Nanna B. Karlsson December 9, 2015

CO2 concentrations from EPICA and Vostok ice cores. The red bar at the side shows the Mauna Loa measurements. Credit: The IPCC AR 4 report Fig. 6.3

The measurements of atmospheric CO2 levels at Manu Loa, Hawaii read 401.01ppm on the 7th of December this year. To understand the significance of this number, you just need to look at the figure above from the 4th IPCC report. It shows the changes in CO2 concentrations during the past 800,000 years based on ice core measurements. Values have fluctuated between 190ppm and 280ppm. In other words, bo ...[Read More]

Image of the Week: Changes in Snow Cover

Nanna B. Karlsson December 4, 2015

Northern Hemisphere spring (March to April average) relative snow-covered area by dividing the simulated 5-year box smoothed spring snow-covered area by the simulated average spring snow-covered area of 1986–2005 reference period.

Who is dreaming of a white spring? In daily life we might be more interested in the chances of a white Christmas, but the amount of snow-covered ground in the spring is a very good indicator of climate change. The figure above shows the projected change in snow cover extent in the Northern hemisphere in March-April according to different future scenarios (i.e. Representative Concentration Pathways ...[Read More]

Sunshine, ice cores, buckets and ALE: Antarctic Fieldwork

Helen Millman November 12, 2015

The field site in the Patriot Hills. The katabatic winds scour the surface of the blue ice, making these ripples which look like the ocean. (Credit: H. Millman)

My Antarctic adventure started from Punta Arenas at the bottom of Chile, opposite Tierra del Fuego, on New Years Eve 2014 after a long journey from Heathrow via São Paulo and Santiago. Punta Arenas Punta Arenas is where Shackleton organised the rescue of his men from Elephant Island after his voyage to South Georgia in the James Caird. It is also where I met my PhD supervisors Chris Fogwill and Ch ...[Read More]

Image of the Week: Greenland Glacier Seen from a Drone

Nanna B. Karlsson November 5, 2015

UAV on its way back from a mission with Store Glacier, West Greenland, in the background. Credit: Johnny Ryan

The use of drones or Unmanned Aerial Vehicles (UAVs) is one of the most exciting development in glaciology in recent years. The picture was taken during fieldwork conducted in the summer of 2014 by Johnny Ryan and colleague Nick Toberg. The aim was to survey Store Glacier once a day using a fixed-wing UAV, that was equipped with a digital camera, which took photos every two seconds during its dang ...[Read More]

Filling the Gap between Science and Politics

Sammie Buzzard October 26, 2015

Have you ever wondered how results from scientific studies make their way into policy and influence government decisions? Read about the experiences of Sammie Buzzard, University of Reading, who spent her summer working for a government body in Westminster, London, UK. This summer I had the opportunity to take some time away from my usual Ph.D. work and spend 3 months working for the Government Of ...[Read More]

Image of Week: Inside the Greenland Ice Sheet

Nanna B. Karlsson October 23, 2015

Cross-section of the age of the Greenland Ice Sheet from radar data. Credit: NASA's Scientific Visualization Studio and MacGregor et al., 2015.

The image shows a cross section of the Greenland Ice Sheet, where a recent study by MacGregor et al. have mapped the layers imaged by radar. Thanks to ice core measurements the age of the layers have been determined, and in the image the layers from the Holocene period (the past 11.700 years) are shown in green. The ice formed during the last ice age, that spanned 11.700 to 115.000 years ago are c ...[Read More]

Image of the Week: Under a Glacier

Nanna B. Karlsson October 16, 2015

Under the Hochjochferner glacier. Credit: Ilkka Matero.

What is happening under a glacier? This is a difficult questions to answer as accessing the glacier bed is usually not that easy. Here, we are getting a rare glimpse of the different processes and materials that are often found at the ice-bed interface. The photograph shows both sediments and hard rock, clear ice and dirty ice, and of course flowing water. No wonder these processes are complicated ...[Read More]

Riding the Storm: The Arctic Circle Traverse 2015

Babis Charalampidis October 8, 2015

Stormy day at Dye-2, 20th of May. Credit: Babis Charalampidis.

In the morning on the 19th of May, we – the Arctic Circle Traverse 2015 – found ourselves in a great dilemma; to stay or to go? On our check-in conversation with the KISS crew, we were informed that an east front from Kulusuk was expected to hit our location up on the ice sheet sometime in the afternoon. The relatively low winds that we were experiencing would get stronger, and the visibility woul ...[Read More]

Karthaus Summer School 2015

Isabel Nias September 29, 2015

The 15th Karthaus Summer School (Credit: C. Reijmer)

After a train, the London Underground, another train, a flight, three more trains and a taxi (shared with people I had met on my way); I had arrived in a small Alpine village in the very north of Italy. The reason for this rather convoluted journey? To attend the Karthaus Summer School on ice sheets and glaciers in the climate system. I’m pleased to say it was definitely worth the trip getting the ...[Read More]

Image of the Week: Hochjochferner

Nanna B. Karlsson September 18, 2015

The margin at Hochjochferner in the fog. Credit: N. B. Karlsson.

The margin of the glacier “Hochjochferner” on the border between Austria and Italy. This glacier has been monitored with an Automatic Weather Station for several years by the Institute for Marine and Atmospheric research in Utrecth, NL.It is also the destination of the field trip that takes place during the annual Karthaus summer school in ice and climate. Here, students are exploring ...[Read More]