Do you miss Ninja?

Well – don’t worry! Dr. Ruth Mottram, a Climate scientist at the Danish Meteorological Institute is on her way to the Greenland Ice sheet and she is bringing “Ice Man” and “Bat Girl” (likely friends of our Ninja) along! Read her cool story here! (The story “Ninja goes South” is still on Flickr.com!)

Ice Man desperately needs to get to the Arctic – read the story by Ruth Mottram here! Photo: R. Mottram.

 

A76 – the largest iceberg in the world (at the moment)

My lunch out in the sun ended abruptly when my husband (also in home office) casually asked if I’d heard about the new iceberg in the Weddell Sea. If my husband – an economist – has heard about an iceberg it’s likely to be big… so I shuffled the rest of my pancake into my mouth and ran in to read!

And yes, a quick google revealed that a huge chunk (4320 km2, to be precise) of the Ronne ice-shelf has broken off! A76, as it is called, is now the largest iceberg floating around Antarctica – but (according to NewScientist) it would not make it onto the top ten of historical giant icebergs.

Will A76 end its days here, in the iceberg graveyard off South Orkney Islands?

It will be exciting to see where it drifts off to – and how it will influence the circulation on the continental shelf in the southern Weddell Sea. One of its old relatives, A23, that broke off from the neighboring Filchner ice-shelf in 1986, is still (!) stranded on the continental shelf, affecting e.g. the sea-ice distribution in the region.

 

The southern Weddell Sea with the location of A76 (not to scale) and the old A23. Modified from Ryan et al, 2017.

Into the “grand canyon”

You might have heard on the news a few weeks ago that a large iceberg
broke off from the Brunt Ice Shelf, in the Weddell Sea. If you follow
the “Antarctic” news – and have a good memory – you might also remember
that a few years ago (2016), the UK research station Halley, that used
to be situated on what is now an iceberg, had to evacuate scientists and
personnel and  move the relatively newly built station as the crack
suddenly started propagating faster than anyone expected. Halley is the
only research station that I know about which is built on skis, so it
was “simply” pulled to a new, safe location on the other side of the
crack!

Ninja and I watching the position of the iceberg as the ship (colored line) heads into “Grand Canyon”.

Anyway – the iceberg, which got the official name A74, finally broke
off, and it has now drifted a couple of nautical miles away from the
remaining iceshelf, leaving a “canyon” between the shelf and the iceberg
that is wide enough for Polarstern to enter. The scientists studying the
ocean floor – benthic ecosystems and sediments – where very eager to get
there to sample what was until recently a sub-iceshelf (and thus very
difficult to access) system.

Ice berg or ice shelf?

We were all excited about circumnavigating A74, and to enter what we
quickly named the “Grand Canyon” – and most of us have followed the
motion of the iceberg on the satellite pictures that we receive every so
often. Is the “canyon” widening or shrinking? Are there smaller icebergs
blocking the passage? Can we get through? The sun, which we haven’t seen
much of during this expedition, obviously were just as excited as we
were, because it decided to join us for most of the day in the canyon
offering a spectacular view of the glittering bluish ice walls around
us!

We got to do three stations in the “canyon” – with intensive sampling of
both the water column and the bottom sediments. The AWI OFOBS team sent
down their camera system, and we could watch the ocean floor beneath us
live on their screens. To me, a non-biologist who are just about able to
distinguish a fish from a sponge it looked mostly like the open ocean
stations we’ve occupied earlier, but to the experts, things were
apparently different. Hopefully they get to repeat the station in the
years to come, to study how the community evolves now that it no-longer
has an ice shelf roof over its heads.

The OFOBS screens showing live video from the ocean floor beneath us were drawing a larger than usual audience

The CTD-profiles we made in the “canyon” all looked more or less the
same – a straight line from surface to bottom (i.e. close to constant
salinity and temperature). Supercooled Ice shelf water (a lighter
version than what we find in the Filchner Trough) was flowing out of the
Brunt ice shelf cavity, and the formation of buoyant  ice crystals at
depth  were clearly visible in the images from the OFOBS team! The ice
crystals had also clearly aggregated on the “geo-bio-chemical-lander*”
line, which were deployed for about 8 hours at one of the stations. When
the lander was recovered, there was a 1 cm thick layer of ice on the
line!

*a big thing full of instruments (for bio-geo-chemical process studies)
that looks like something that would land on the moon.

It is easy to write home about cute seals and beautiful icebergs, but much more demanding to tell about things that are not as nice #InternationalWomensDay

It is easy to write home about cute seals and beautiful icebergs – but
much more demanding to tell about things that are not as nice.
In a way,  every research expedition is a social experiment – you find
yourself isolated on a ship with lots of people you never met before,
you live, eat and work with them and there is no way to escape.  I have
always loved being at sea, to enter this small bubble where everything
is here and now and the world outside is far away. But just like in any
reality show where they close people up together, there will inevitably
be conflicts (and every now and then a romance), there will be good guys
– and bad guys. Unfortunately, I was put on a shift together with one of
the latter. He obviously considered himself superior to me in all
possible ways – in addition to being generally arrogant, he made it
perfectly clear that what I did was no good, that I was not to be
included in discussions (neither scientifical nor social) and that, as
he put it, it was just stressful to have me around. I tried talking to
him about it – without success – and at some point, I just walked away
from it all, crying.

Later, I had a good talk with my group leader about it – many thanks to
him (and others) for support – I’m not on that shift anymore, and I’ve
decided it will do me no good to talk to the person in question again
right now, so I just stay away.

I am still disappointed with my own reaction. I know a male colleague
likely would not have reacted that way – but I also know that a male
colleague likely would not have been treated that way to start with. I
wrote about this on Twitter and was contacted by two younger women who
have had similar experiences, with the same person. Reading those
e-mails made me so angry I had to go down to the gym for an hour to run
it off.

Today is the international Women’s day. More than once in the past have
my daughters returned from school on this day, saying “Congratulations
on Women’s Day” – and more than once have I tried to explain that they
should not be congratulating, that it is actually depressing that still
in 2021, we need this day. That still in 2021 men and women are not
being treated equally.

Pancakes for breakfast on Polarstern – and pancake ice outside!

Breakfast on Polarstern is served between 07:30 and 08:30, and my usual
order to Maya behind the counter is “Zwei Pfannkuchen, bitte” – two
pancakes, please. But today there were pancakes not only on my plate in
the canteen –  the ship is surrounded by them! Rounded, small ice floes
with slightly elevated edges. My favorite type of ice!

It’s been quite cold the last couple of days and ice formation has
really kicked off. Autumn and winter is approaching rapidly! When I’ve
been up at the bridge to do sea ice observations in the mornings*, I’ve
started to use terms like “Nilas” and “fingerrafting” in addition to
“first and second year ridged floes” which is what we have had around us
before. When ice is formed on the ocean during calm (little wind)
conditions, the ice crystal initially makes a grey  ice “carpet”
(Nilas), that bends nicely over waves and that will break in “fingers”
that slide alternatively under and above fingers from the neighboring
“carpet” when the ice converges.

Finger rafted Nilas bending over the waves in the wake of the ship.

In windy conditions, the ice crystals will be forming not only at the
surface, but also in the upper (10-20m) of the water column and the
buoyant ice platelets rise to the surface and form what’s called grease
ice (it looks really greasy). Because of the motion in the water
initiated by the wind (Langmuir cells), the grease ice will typically
form streaks in the water surface, aligned with the wind. If freezing
continues, the grease ice will turn into small floes, that continuously
bump into the neighboring floes as they are moved around by wind and
waves, and the floes therefor end up having rounded shapes and elevated
edges – pancakes! With time, the pancakes grow, as small pancakes grow
together or raft on top of each other.

White pancake ice

The pancakes we have around us now was formed further north – and the
biologists on board are super excited about these pancakes. Pancake ice
is generally white or grey – but our pancakes are turning more and more
yellow! Some form of biology is thriving on (or under?) the pancakes –
and since the bio-geo-chemists have not seen this before they are all
very keen to get out on the ice to sample!

Yellow (consolidated) pancakes.

Personally, I prefer white pancakes on the ocean and yellow pancakes
(with jam) on my plate!

*we do sea ice observations every hour when there is daylight, and seven
o’clock is my slot

 

Helicopter flights and seal-tagging attempts

Everyone who has had the opportunity to put on a helicopter survival
suit knows that “easiness-to-get-into” and “comfortable-to-wear” were
not high up on the designer’s agenda when they were created… but I’ve
managed to crawl into  one of them and I’m waiting together with Mia and
Horst to get into the helicopter for today’s seal tagging expedition.
It’s my third – the first one was not very successful. We had to fly far
to find an ice floe large enough that we would be able to land on it –
and when we finally found it there were no Weddell Seals to be found.
Plenty of seals, but the wrong ones. Karsten, the pilot, flew back and
forth across the ice floe, from one black seal dot to the next – but the
dots were repeatedly identified as “Crab-eaters” by Mia or Horst.
Crab-eaters feed in the surface water, while Weddell Seals dive down to
the bottom to find food. That’s why the latter are ideal as
oceanographic helpers  – we put a small sensor hat with an antenna on
their head; every time the seal dives down to feed it collects  a
temperature and salinity profile, and when the seal later rests on the
ice, the data is transmitted back to us via satellite. Since the Weddell
Seals stay in the pack ice all year, we can obtain salinity and
temperature data throughout the winter – when it is impossible for
research ships to reach the area.

Back to today’s expedition, which started out better than my first one –
it didn’t take long before Mia spotted a Weddell Seal and we were on the
ice. But before we had sorted our gear and changed to our
“work-on-the-ice-clothes”, the seal had slipped into the water and there
was nothing to do but to  crawl back into the survival suit and find our
seats in the helicopter. Mia soon caught a second Weddell seal in her
binoculars, and we were down on the ice again – only to realize that it
was a juvenile, too small to be tagged. Horst quickly returned to the
helicopter, clearly disappointed. Mia and I admittedly enjoyed the
encounter with the youngster and lingered with our cameras. Contrary to
the older, very lazy seals, this one was curious and clearly interested
in the strange two-legged red-dressed creatures that walked into his
lonely, white world.

Too small to get a tag – but very cute!

We were soon up in the air again – and found what seemed to be the ideal
location. Three Weddell Seals within what seemed like walking distance.
The helicopter took off – and there we were, all alone with our bags… on
an ice floe in Antarctica! We soon realized that the ideal location was
everything but ideal. The ice ridges and the glittering snow around us
was breathtakingly beautiful – but likewise breathtakingly hard to walk
across. When the closest seal turned out to be a second juvenile (just
as curious and cute as the first one), we soon had to give up. The other
two seals where too far away – if we would even be able to find them
within the maze of ice ridges.

Chilling out in the helicopter before take-off.

It was three disappointed, tired and very hungry seal taggers that
returned to Polarstern that evening – but we soon cheered up when we
learned that yesterday’s seal had started sending data, and that the
weather forecast for tomorrow promised good flight & seal tagging
conditions.