Here is a quick snapshot of some data from the new Fjalls site:
It is already approaching 2m distance from its original location – also the jitter on the positions is very small.
This is temperature from Rover4’s Peli case, which is the heighest on Breida and is showing good variations (X axis starts in August).
The little Brinno camera we left on a monopod last October 2017 continued capturing images until the 9th of June 2018. Here is a frame from a sunny morning in March showing how much the ice drives over the moraine:
The camera managed this on four lithium AA batteries.
We have been awarded a National Geographic Explorer grant entitled “A tale of two glaciers: using web connected RTK GPS, drones and remote sensing to monitor rapid glacier retreat of two contrasting Icelandic glaciers”. This will be a two year project to examine the rapid retreat of two icelandic glaciers, using the innovative web connected dGPS system.
“At around 5 AM Pacific Time (1 PM GMT) today (March 7th) the GPS satellites started transmitting inconsistent health information causing Swift Navigation receivers to exclude measurements from any satellites supporting the L2C signal. This has resulted in degraded or unavailable position information and decreased ability to achieve an RTK Fixed solution.”
We kept an eye on the data coming in – as it is not easy to go to Iceland and update the firmware..
This plot shows how the gps behaviour changed after the march 7th announcement. Without knowing this we could have assumed it was caused by something like wet snow cover.
There is a nice write-up from Formula E on Ice drive: a lasting legacy:
Since fixing the Fjalls system we have a steady stream of data – showing the glacier moving:
This shows a movement of around 1.5m in just ten days.
Today we set up two dGPS units to measure the speed of some of Fjallsjökull glacier. We chose an area of ice which is clearly moving forward towards the lake.
Here is the dGPS system setup on Fjallsjokull, with Jane Hart and Frey
The photo above shows a “quadpod” supporting the GPS units – which are an adaptation of those made by Matthew Roberts of the Icelandic met-office. The idea is to be strong enough to cope with winter and cast few shadows (which cause ice to grow). The system is currently measuring its position every 3hrs to an accuracy of about 2cm – using signals from the base station to help it.
the dGPS base station installed on a moraine close to the Fjallsjokull glacier. We used speaker stands burried in rocks to support the GPS antenna (top) and hold its 2.4GHz radio antenna (white stick). Shortly after this photo I accidentally kicked sand into the laptop keyboard – so it was not so easy to use after that!
View of Fjallsjokull with our deployement being almost in the middle of this photo.
These new dGPS units seem to be accurate to around 2cm as shown in our test. This is for a close baseline (and at the moment doesn’t use GLONASS).
Testing the Piksi Multi from Swift Navigation. North/East relative position of rover – in a 96s test in an open space. The readings are quoted as accurate to 0.023m H 0.037m V.
Iceberg tracker temperatures from 9/8/16 to 7/10/16
We have been checking the iceberg tracker temperature as one way of telling if it is in the sea is a flatter daily variation in temperatures. Here you can see it did regularly read sub-zero at midnight then warmer an noon. Recently however it is showing mainly positive temperatures.
iceberg tracker locations up to 7/10/16
After spending weeks among the small islands in the centre of this map – it has moved south until reaching land again. This dramatic movement may be because the iceberg has broken up.