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Havsis på Antarktiska oceanen.

Postat november 15, 2016november 15, 2016 Full storlek 5184 × 3456

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Investigating the structure and evolution of the drainage system within and beneath glaciers can be a serious challenge! This pink substance was the reason our clothes turned bright pink, and even the inside of the polar station became pinkish. As you can imagine, the boys were not happy about it. What you can see is the outcome of fluorescent dye tracing on Waldemar Glacier, a small valley glacier close to the NCU Polish Polar Station in northwest Spitsbergen. Fluorescent dyes such as rhodamine B powder or rhodamine WT liquid are popular for glacier hydrology studies because of their high detectability and the small quantities required. If a quantity of dye is injected into a crevasse, and then detected downstream, the travel time of the dye within the system, the spread of the dye breakthrough curve, and the percentage of dye detected can be calculated. Fluorescent dyes used for tracing, transform a high proportion of the absorbed energy to emitted energy and can be detectable at very low concentrations. A fluorometer is used downstream to detect the dye return curve when it reaches the proglacial stream. Fluorometers measure the intensity of light emitted by the fluorescent dye, which is proportional to the concentration of dye in solution. These trace characteristics can then be used to determine the morphology of the glacier-hydrological drainage system. Photo T. Grajewski #npolar #research #polar #glaciology #glacier #science #polarscience #svalbard #spitsbergen #fieldwork #kaffiøyra #fieldphotofriday #ice #hydrology #scicomm #forskkomm
We @npiglaciology heard about #world_record_egg. So here is our glaciology #eggscience. This is a Landsat-8 satellite image of the ice cap Storøyjøkulen, situated on a small island in northeastern Svalbard. The almost perfectly symmetrical icecap, which covers the southern half of the island, looks (more or less) like an egg. One difference, however, is that our “egg” white is in the center. This is the accumulation area, highest up on the ice cap, where the snow that falls each winter survives the summer melt. At the end of each summer, some denser snow remains; this is called firn. As the firn is buried progressively deeper, its density increases, until finally firn turns to glacier ice. Drilling into the firn and ice one would find layers with different amounts of dust or other impurities. This layering is preserved; as ice flows out and away from the center of the cap, it is melted away at the lower elevations to reveal the oldest layers as a series of concentric rings. What isn’t so easy to see in the first image is that there also radial lines coming from the center of the ice cap; these are the drainage channels that form each summer as meltwater flows from the snowpack out to the surrounding ocean. These channels are more readily seen in a Sentinel-2 satellite image from a different year, with false color filtering applied. The Landsat satellite image (NASA/USGS) of Storøyjøkulen can be found in the book “Svalbard from Above”, published by the Norwegian Polar Institute. #npolar #LiketheEgg #svalbardfralufta #svalbardfromabove #fieldphotofriday #storøya #photoart #scisomm #forskkomm #outreach #ilovescience #polarscience #naturesart #egg #egggang #eggscience #theegg
Reposted from @oceanseaicenpi - Measuring under 300 m of ice | While the Arctic field season has not started yet, the field activity is high in the Antarctic! The logistics team at the Norwegian Antarctic station Troll found a good weather window to service the three under-ice shelf moorings at Fimbulisen. The moorings measure ocean temperature and currents at two different depths underneath the 300-m thick ice shelf since 2009! Together with data from an autonomous radar installed at one of the site they provide valuable information on ocean-ice shelf interaction in Dronning Maud Land. The mooring sites were reached by aircraft and after digging some meters in the snow the boxes with batteries and data loggers were found, still logging. The moorings were outfitted with new batteries so that they can continue to measure the ocean properties under the ice shelf for another two years. | Photos: Sven Lidström, Norwegian Polar Institute . . . #npolar #Polar #NorskPolarinstitutt #SciComm #Outreach #Antarktis #Antarctica #FieldWork #Forskning #Research #Science #Forskkomm #STEM #RealFag #ClimateChange #Expedition #SouthPole #dronningmaudland #dml #iceicebaby #fimbuliceshelf #iceshelf #Antarcticadventure #extremeenvironmentsexpeditions #polarexploration #ilovescience #troll . @norskpolar @iflscience
Name: Alistair Everett Where are you from? Yorkshire, UK When did you move to Tromsø? September 2016 What do you work on? I study ice-ocean interactions, usually at large glaciers which flow into the ocean around the coastline of Greenland and Svalbard. I use a bit of computer modelling along with field data to understand the effects of melting ice on ocean circulation and vice versa. Recently I’ve also become interested in how this affects local ecosystems which rely on the glacier for food. What was your dream job when you were a kid? I’m sure it changed on a day to day basis, but one thing I’m sure of is that I never thought I’d be a scientist! What’s the best thing about being a scientist? There are always new challenges! Science is never really finished, there are endless things to understand about how the world around us works. If you can’t think of something you don’t fully understand, you’re not trying hard enough! Science lets you find out some of the answers no one else has yet. What did you study? I took a fairly indirect route to get into science, I did an undergraduate degree in Civil Engineering, before working for a few years as a Bridges and Design Engineer. After a while I decided I needed a change, so I contacted a few people about PhDs and eventually found my way to Swansea University where I did a PhD in glaciology and fjord dynamics. One thing I’ve definitely learned – having a background in engineering, maths or physics is a very good way into science! What’s your funniest field work moment? Stopping a foam tent-underlay blowing away mid-poo! Yep, you read that right. Long but very funny story, ask me over a beer ;) What’s your favorite polar animal? We came across some Musk Oxen while I was on an expedition in Greenland. In the middle of winter they’re big long haired beasts, like something out of Star Wars. They were the first animals we’d seen for a few weeks and I’m pretty sure they were as interested in us as we were in them! What’s your favorite field work food? Primula (cheese in a tube)! Horrible stuff normally, but on a five-week expedition it’s like liquid gold! #npolar #polarportraits #fieldphotofriday #primulacheese

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