— Katie Joy | 03 Jan 2020
What a difference a bit of weather makes. This whole area was stunning blue ice a couple of days ago. Two days of gentle sustained snowing means that the whole icefield is now buried under 5 cm of snow. This is useful for the metal detector dragging activities (see Geoff’s last post) as it means that we can very easily see where we have driven (in the image above the panel tracks can clearly be seen in the lower half of the image, compared with the unsearched area in the upper part of the photo). On the other hand, these conditions are absolute killers for the surface meteorite searching activities as all the meteorites are now very disappointingly disguised by the snow cover. We need a night or two of 20 knot winds to come in and blow hard to shift all the snow. However, the weather is forecast to remain the same (~ –10ºC, 5 knot easterly wind, patchy sun and clouds) for the next couple of days.
In the meantime the subsurface meteorite hunting activities continue using the metal detector panels – we have now managed to search about 0.6 square km of the ice surface, with Wouter being an absolute legend fixing bits of the system that fail with all the bumping around on the hard ice surface.
— Katie Joy | 27 Dec 2019
Whilst the panel testing is continuing (see Geoff’s last blog post) we have also been making steady progress with searching the ice surface for meteorites that have emerged from the blue ice. As of today the count is at 35 stones from Outer Recovery — one off the total for the whole of the last recon field season.
Every rock we locate at this particular ice field is a meteorite — there are no terrestrial rocks at all, so it makes identification very easy. What is tricky is actually spotting them in the first place — often the meteorites are hiding at the bottom of suncups (small depressions made as the ice is ablated by the wind and sublimated on warmer days), and for those less than a couple of cm in size you have to be lucky to see them as you drive past on your skidoo and be looking in the right direction (for this reason we swivel our head continually as we drive like watching an end-to-end tennis match). Samples bigger than ~3 cm are easier to spot, but again can sometimes be nestled down between snow patches or in suncups. Whether you are driving into the sun, and the angle of the shadows cast at different times of the day comes into play, so although we are systematically trekking back and forth across the ice surface, not every search session results in a meteorite find: between 2 and 7 meteorites seems to be the rate of daily collection at the moment.
The meteorites themselves vary from a small bean-sized one we found yesterday (a lovely perfectly fusion crusted stone, suggesting that this tiny meteorite is a complete piece), to another complete stone which preserves a fusion crust that is flight shaped (i.e. we can tell which in orientation the meteorite was delivered as it travelled down through Earth’s atmosphere — these type of samples are very aesthetically pleasing, and are really cool to find), to some larger blocky stones (around the 8-20 cm size range) that look like they are pieces of a large meteorite that broke up either in space, or through erosion as it was transported through the ice [NB I am guessing that they are from the same parent meteorite at this stage based only on the colour and texture of their exterior surface, and the very similar colour and texture of their interior — this will all need to be confirmed when we do the formal classification back in the lab]. Several of the samples we found this year are like some of those we found last year, suggesting that again there might be some relationships between the samples we have collected, and others look completely different which is exciting as it means we have good diversity across the sample set collected.
So, all in all, we are progressing steadily, and hopefully will continue to get more meteorites bagged up. Today the weather has turned snowy so will have to see how this effects our search plans over the next few days.
Hope that everyone had a Happy Christmas — we had a tasty meal last night together complete with an amazing Christmas cake provided by chef Olly at Rothera (many thanks — you are a star!), and had a team drive out after testing the panel array to visit a cool ice rise (which is a bit of ice that has been squeezed up to look like a pointy mountain tip) next to the search area.
PS Many congratulations to my Aunty Angie and Tommy for getting engaged. Sorry I cant be there to celebrate with you all, but raising a cup of tea to you from the field.
PPS Thanks Isotope Group crew for sending down the birthday card. Very sweet of you all to get so organised in advance. 🙂 Much appreciated. Hope that you are all well and looking forward to the BPSC.
PPPS Dutch, we found some pina-colada flavoured energy bars in the manfood box. Definitely not as exciting as the real thing.
— Katie Joy | 22 Dec 2019
The team is all together now at our Outer Recovery fieldsite! The last few days have seen a lot of activity. On the 19th I flew from Halley with pilot Mark to drop off the science kit at Outer Recovery with Wouter and Geoff — this included the final set of panels and our meteorite extraction equipment. Then a series of short 30 minute flights took us to a refuelling depot, over to Romain and Taff to collect a skidoo and a Nansen sledge, back to Geoff and Wouter to drop these off, back to refuel the plane, then back to Romain and Taff to pick them and the final skidoo up, and finally drop everyone off at Outer Recovery site.
It was a pretty long day with a lot of flying, with a lot of skidoo loading and unloading onto the planes (this whole exercise is a right pain in the butt – the skidoos just (just) about fit through a Twin Otter door and it takes four people to rotate, bump, pull and push them in and out of the plane). Finally, we were all together as a team, and the next day we waved goodbye to fieldguide Rob who returned with pilot Mark to Halley, before moving camp 2 km down the road (or rather sastrugi-covered surfaces) to set up on the edge of the blue icefield where we will be working. It has been sunny, cold but very windy (we reckon about –22°C with windchill) at the field site. Yesterday, the summer solstice, brought a day where we explored the ice surface, finding 7 more surface meteorites (a nice mix of shapes and sizes, with several looking different to each other), and did some more in-field testing of the panel arrays – we have been burying small iron dummy meteorites to tune the system to working on ice (rather than the rocky cargo yard at Rothera, or the soil field at Whaley Bridge). The wind has dropped, the temperature is up and today the plan is to do another testing round out on our practice search area to get the system finalised. Hopefully we will be in a position to begin buried meteorite searching soon, and in the meantime will do some more surface searching.
— Katie Joy | 18 Dec 2019
We have written several posts about Halley research station, our home-from-home research base for the past two Antarctic field seasons — but what other science is being supported from Halley?
The station, located on the Brunt Ice Shelf at Lat. 75°34’5″S, Long. 25°30’30″W, has been occupied as a British base since 1957. The current version is called Halley VI and, with its futuristic space-station looking red and blue modules, is currently home to about 35 people in the summer who are supporting the station infrastructure and are assisting in the long-term science experiments running out of the station. Currently, because of potential issues surrounding the possible breakup of the Brunt Ice Shelf (see news stories here and here) the station is being operated in summer crew mode, and in the winter (from February onwards) all the staff leave Antarctica and return to the UK.
Current Science projects
Ozone hole monitoring: Measurements made at Halley that led to the discovery of a hole in the ozone layer in the 1980’s, leading to banning of CFC chemicals and international concern about the effects of ozone loss in the stratosphere (middle atmosphere). The equipment that made the discovery is still in use at Halley VI: called a Dobson spectrophotometer, is a device for measuring the amount of different wavelengths of ultraviolet (UV) radiation that reaches the ground (read more here) and used to determine ozone column density above our heads. Antarctica is a great place to make these measurements as there are few atmospheric pollutants which might absorb the specific wavelengths of light being measured. The station has a manual version of the spectrometer (see photo), a separate ozone monitoring station, and also recently has installed a computerised Dobson spectrometer that can run in automated mode through the Antarctic sunset and sunrise around winter when the base is without a crew. This automation has been made possible by the introduction of a micro-turbine energy generator, which ensures that this 60 year experiment can continue to run and collect data to ensure scientists with a continuous record of Antarctic ozone layer variation.
Climate change monitoring, atmospheric and daily weather observations: Understanding how the climate is changing through time is a key science priority for the British Antarctic Survey. Every day the researchers here launch a weather balloon to measure the temperature of the atmospheric column, a record going back over 30 years which suggests that the atmosphere has been warming year on year up to 8 km in height above the ice surface. Scientists also measure the chemistry (trace gases and aerosol) of the Antarctic air using a special clean air sector laboratory (the lab is located in a position where aircraft cannot fly above it and no one can drive a mechanical vehicle like a skidoo in its vicinity — as such people Nordic ski or hike out to visit the site). Other atmospheric monitoring experiments to understand global high altitude wind (gravity wave) propagation, lightning strikes, and high altitude (87 km) temperature measurements all complete a suite of instruments that are setup or are being set up to run automated throughout the Antarctic summer and winter seasons to understand Earth’s atmosphere. In addition to these high altitude and long term climate records, daily weather (temperature, dewpoint, wind speed, cloud coverage, cloud type) is recorded and is also used for helping out logistical planning for aircraft movement around the area.
Space weather observations: Space weather is the term used when energetic particles ejected from the Sun interact with the Earth’s protective magnetic field (known as its magnetosphere). Often this interaction manifests itself as aurora at the northern and southern poles (also known as the southern and northern lights). An all-sky optical camera and, in the future, a new camera system will be able to monitor changes in local aurora conditions at Halley to determine the effects of ionisation in the upper atmosphere. This ionisation can also alter Earth’s magnetic field itself, and a series of magnetometers run at Halley to monitor these changes. Together this knowledge helps to understand the potential electromagnetic risks to orbiting satellites and on Earth electrical-based infrastructure, as well as helping unravel the fundamental science of how the Earth interacts with its space environment.
Brunt Ice Shelf movement: The ice under our feet at Halley is about 150 m thick. The station is slowly drifting towards the Weddell sea as the Ice Shelf propagates off the continent heading in a north-westerly direction. The Brunt Ice Shelf is continually in a cycle of growth and then break-up when large parts of the Ice Shelf edge carve and break off into the sea. At the moment there are two very large cracks opening up to the north (the Hallowe’en crack) and to the west (Chasm 1 crack) of the station. The development of these cracks and the movement of the Brunt Ice Shelf is being carefully monitored using high spatial resolution GPS stations and radar stations that are distributed around several sites on the Brunt. As and when, the Chasm 1 crack finally breaks the Ice Shelf in two, BAS will be a unique position to monitor the carving event and watch how the remaining Brunt Ice Shelf under Halley station responds to the change.
— Katie Joy | 15 Dec 2019
The last few days have been quite busy for everyone in the team with some key field movements happening.
On Friday (13th) Romain and fieldguide Taff were input to the last campsite we visited earlier in January 2019, and where our depot site was located. More from them in the next blog post… Their mission was to dig up the depot, get all the skidoos working, and start sending loads over to Geoff, Wouter and fieldguide Rob at the new camp site.
Geoff, Wouter and Rob meanwhile were sitting pretty at the Outer Recovery site waiting for the first loads of inputs to be delivered. Yesterday, two skidoos, sledges and rescue kits were delivered in by Twin Otter pilots Mark and Dutch, along with some much welcome snacks and baby wipes. They have journeyed over to collect the science kit that was dropped off, and have scouted a new potential camp site close to the icefields where we want to work. I think, after a week of sitting around building igloos, they are excited to start working.
The plan for the next few days (weather permitting) is to ensure that there is fuel at the local depot site, then get the rest of the kit over to Geoff and Wouter, and transport Taff and Romain over to Geoff. In the meantime I am sitting at Halley drinking a lot of tea and generally plumping up on all the amazing food watching remotely news on the guys work hard in the field. Hopefully I will fly out on the last load of science equipment to join everyone when they have the camp suitably set up for my arrival 😉
The weather has been pretty foggy here at Halley, giving the modules an eerie look like a spacestation on an alien world. The staff on site have been working hard to raise the buildings up out of the accumulated snow which was deposited in the Antarctic winter. The Brunt icesheet normally gets 1 to 2 metres of snow in the winder season, quickly burying the structures like the Drewry accommodation building photographed below. Over the coming weeks the modules themselves will be raised up so that they are rising over the surrounding area rather than looking like they are sitting on ground level.
— Katie Joy | 12 Dec 2019
I arrived at Halley Research Station two days ago (10th December), after a long day of flying from Rothera (~8 hours of flying with one stop on route at Sky Blu — thanks pilot Ian and co-pilot Tim). We journeyed out first over the Antarctic peninsula, with small mountain ranges popping out of the continental ice shelf, and then out over the Ronne Ice Shelf, which is a large flat expansive area of freshwater ice pouring off the continent into the Weddell sea. Lots and lots of flat white out of the window for several hours. Where the ice shelf finally meets the sea ice there is open ocean with many large freshwater icebergs bobbing around between still frozen sea ice floes. Some of the freshwater icebergs that have been liberated from the Ronne have amazing shapes — see this perfectly rectangular example in the photo. The ice floes, which melt and refreeze annually, are fractured and complex, looking as you fly over them like the surface of Jupiter’s moon Europa, with its chaotic terrains (when you are a planetary scientist you start spotting terrestrial analogues whenever you look out of the plane window). It was a beautiful flight.
I joined up with Romain at Halley who has been based here since last Friday (6th December). We have spent the last couple of days working with fieldguide Taff and the pilots to figure out how to order the Twin Otter plane loads to send out into the field. There are a lot of logistics needed to get us and the metal detection kit to join up with Geoff and Wouter, and also ensure that there is enough aviation fuel at a depot site so that the planes can stay fueled up and flying (with contingency in case the weather changes). Its a bit like a space mission planning exercise — bartering which of the field equipment and people are the most important to get out first in case we have a major weather delay changing the schedule further on. When you only have so much weight you can put onto an aircraft with a round trip of x number of km… what do you take in which order?! Whilst we wait to get out and about we have also been helping out around base, and enjoying some of the local evening entertainment including playing pool and table tennis, and last night I gave a science talk to share whats going on with the project with all the people working on station who have been supporting the project. We are really grateful to the team at Halley who have been hosting us in this amazing research station.
— Katie Joy | 5 Dec 2019
Rothera Research Station is located on a small peninsula called Rothera Point, protruding from Adelaide Island into Lauberf fjord. Walking around the point is a favourite evening pastime — it takes about an hour to do a circuit and return to the base, longer if you are wildlife spotting.
The view from the point into the fjord is stunning — at the moment the sea to the north is ice locked and icebergs (tens of metres in size) are released every so often, bobbing towards to the south into the open water of Marguerite Bay. Small floes drift around on the open water and cling to the shoreline when the wind is up. Since we have been here the sea has varied from angry, stormy and choppy, with small white horses whipping around, to flat and calm and totally clear producing amazing reflections from the ‘bergs (we could see several metres down to the sea floor, though apparently it won’t stay like this for long as the plankton will be blooming soon, reducing the visibility). Across the bay is a snow capped mountain range including Cape Sáenz, which is the southernmost point of the Arrowsmith Peninsula.
We attended a wildlife briefing the other night to familiarise ourselves with the different types of animals we might see: the staff at Rothera are recording which species are spotted as part of a long-term monitoring programme.
There are numerous mammals in the area including a number of seal species: we often see both noisy elephant seals that live around base (occasionally visiting us to see what we are up to — see the post from a couple of days ago when one was hanging out next to our metal detector array in the cargo yard), and the smaller Weddell seal. There are small gangs of Adelie penguins, which are utterly comical and cute as they run along flapping their wings, and their heads down. The airborne bird life is spectacular, with Antarctic terns, Antarctic shags, snow petrel, Wilson’s storm petrel, Skuas, and Kelp Gulls. Sometimes in the austral summer orcas (also known as killer whales), humpback whales and minke whales frequent the bay. Hopefully when we come back through Rothera in mid-January we might spot these ocean dwellers.
Note that all the photos above were taken with a zoom lens — we keep a healthy distance from the wildlife so as not to disturb them.
— Wouter van Werre | 5 Dec 2019
Before we can go searching for the meteorites, we have had to complete an extensive training program. For Romain and myself it was a very packed schedule, as we had to start from scratch. Katie and Geoff, on the other hand, had already taken some of these modules last year so they did not have to repeat all of them. The training program covers everything from how to be safe on the base, to how to record meteorological observations in the field to pass onto the weather forecasters at Rothera. Due to the poor weather the final module was delayed by a few days, but on Monday we were finally able to complete the program.
Romain already described our overnight stay just outside the base, but I thought it would be interesting to explain the different training modules we had to take since our arrival.
One of the first modules we all have to take is about aircraft safety. While the Rothera Research Station is the place where we all live and work, it is also an active airfield with the runway in the middle of the base.
Therefore we all have to be aware of the procedures for crossing the runway, how to approach the aircraft when they are on the apron (taxiway area) and how to communicate with the pilots. Afterwards we also learnt what to expect when we will be flown into field by Twin Otter aircraft.
The IT/communications team gave us a brief overview of the available IT resources, such as public computers and phone booths, as well as how to get access to the internet on personal laptops. They also introduced us to the VHF radio equipment and protocols that are in place for communications around the base.
One of the field guides walked us through all the clothing that BAS has issued to us, how the different layers work together and how to stay warm in the polar environment. All the different activities that are undertaken by the people here on base, as well as those in the field, require very different clothing systems. While we covered this before during our pre-deployment training with BAS in Cambridge, this served as a very useful reminder
Later on in the week we also went through the field medical box with one of the doctors on the station, walking us through all the medical kit available to us and how we can make best use of it.
Some of the modules, such as skidoo training and gator training are very hands-on. The gator training covers the use of the small wheeled vehicles, called gators, which are used to move around the base. By now the snow has been cleared from all the main paths around base, making these gators the perfect vehicle for moving around goods. Outside of the base there is still plenty of snow, which requires the use of the skidoos. During the skidoo training module the vehicle technicians took a group of us out on the skidoos and into the local travel area. Here we learnt how to safely operate the skidoos, particularly on slopes, where you have to be careful not to “roll the ‘doo”. They also showed us the outline of the local travel area, which is where people can move around safely on their own. This area is clearly delineated using flags and drums. We were also taught how to do the pre-start checks and basic maintenance tasks on the skidoos, which was particularly useful for us, as we will have to do these on our own when we go out into the field to look for meteorites.
One of the more surprising modules we had to take was the meteorological observations module. All field parties have to be able to record the current weather conditions and transmit these back to Rothera, especially when the aircraft are due to land at the campsite. Together with the forecasts that are generated by the forecasters on base these can be used to make decisions about the aircraft movements. We covered the basics of estimating the wind direction and velocity, the amount of cloud cover, cloud types and cloud height, as well as visibility and contrast. All these observations have to be transmitted hourly if there are any planned aircraft operations in the area.
This was a very interesting module for me, as I had no prior experience with taking structured weather observations (and I never knew there were so many different types of clouds!).
Far and away the largest group of training modules we had to take are the field modules (1, 2, 3, 4 and 5). These cover all the skills required to live in a field camp and safely move across the Antarctic terrain. For example, field module 1 covers the basics of how to use the Primus stoves and Tilley lamps and how to set up a 2-person mountain tent. The camping trip Romain wrote about earlier is part of field module 2, where you go out in a small group a few kilometres outside of the Rothera base. When we were on the hillside we were taught how to put up a pyramid tent, where to put the crates with cooking equipment and food, where to put the stove and Tilley lamp and how to arrange your sleeping area. We then had to cook some food (by melting some snow first!) and we stayed the night. It is amazing to realise that the pyramid tents, the Tilley lamps, and primus stoves are all the same design as those used by the likes of Scott and Shackleton.
Geoff and Katie joined us for the field modules 3 and 4 which cover basic mountaineering and crevasse rescue skills. We practised walking with crampons, climbing up and down steep snow-covered slopes, and walking on ice. We also had to practice being roped up to another member of our group, how to arrest a fall if the person you’re roped up with falls into a crevasse, and how to anchor the rope into the ground. We did all of this outside on one of the hills just next to the base. We then went inside to practice other crevasse rescue skills such as abseiling down into the crevasse, jumaring back up the rope, and how to set up a five-to-one pulley system to lift someone out. While I found this module very interesting, and I really enjoyed the ropework and the abseiling, I do hope we never have to use these skills!
The final training module took all four of us back outside again, this time to practice linked travel on a skidoo. With linked travel a pair of skidoos and a pair of sledges are connected by a heavy rope. This way, if one skidoo does fall into a crevasse, the other skidoo will arrest the fall. Each skidoo has a rescue sack on the back with the gear required for a crevasse rescue, which we practiced in the earlier modules. The first sledge contains all the necessities to make a base camp (known as a full ‘unit’), while the rear sledge contains a half ‘unit’, from which we can make an emergency camp.
It takes a bit of practice to keep the skidoos synchronised so that the rope is just slack, but not so slack that the rear skidoo drives over the top of the rope.
This is an overview of the type of training a field party might receive before heading out into the continent. There are, naturally, many other training courses available as well for those who do other jobs on station.
For example, anyone who expects to launch and retrieve boats into the sea has to learn how to drive the tractors and operate the cranes.
All in all it has been a busy week and full of training and testing our science equipment. The training courses have been very useful and definitely add a bit of confidence before going into the field.
Many thanks to all the people on station who have helped us prepare during the past week and a half!
5 Dec 2019
Geoff and Romain are currently on a plane with field guide Rob starting their journey to the field… the plan (as always with Antarctic fieldwork) is complicated and they will now be transiting to the Outer Recovery ice fields, first, via Sky Blu field station (where Geoff visited last year), and then, by way of BAS’s Halley research station (where Katie visited last year).
The preliminary plan at the moment is that Wouter will fly out next with a lot of our science kit, and Katie will go on a final plane load, and we will reunite with field guide Taff at the field site. More updates when the next one of us catches a plane! For now happy flying to Geoff and Romain — the weather is stunning today so they should get a good view out of the window.