Surface camp
Halvard Dome, summit. Four tents, one tower, a trench cut into the snow for the logging bench. The top of the core is last summer’s snow: wind-packed, bright enough to hurt, soft enough to crush in a glove.
Eight hundred metres of winter, read from the top
Halvard Dome, summit. Four tents, one tower, a trench cut into the snow for the logging bench. The top of the core is last summer’s snow: wind-packed, bright enough to hurt, soft enough to crush in a glove.
Tap the core at any depth. A disc is sawn out, laid on the light-box and turned between crossed polarisers. Every grain of ice becomes a colour.
“Day 2. Eighteen metres before supper. The firn squeaks on the saw. Tomas says it sounds like new shoes.”
I. S-O. · field log
A glaze of clear, bubble-free ice, years down. One warm summer the surface melted, trickled into the snow below and refroze. That summer’s own layer is gone, which is how the band got its nickname: what you see is the hole where a season used to be.
Annual layers. A pale, fine winter; a thin, coarse summer. Here each pair is thick. Count them like tree rings.
Down to here the core is firn: old snow, still porous, still breathing the sky above it. At about 70 m the weight overhead pinches the last channels shut. The grain disappears, the air is sealed in, and from this line down the core is ice.
“Day 9. First clean three-metre run. Bubbles all the way through it, like a held breath.”
I. S-O. · field log
Four millimetres of grey glass shards. Their chemistry matches the Verrin ash, dated in lake mud far from here to years before drilling. Counting annual layers down from the surface, the team arrived within nine years of that. The count holds; everything above is pinned.
Each bubble is a sample of atmosphere, closed in when the firn sealed. The air is a little younger than the ice that holds it. Deeper down, as pressure builds, the bubbles shrink and stretch.
Thinning. The same year of snowfall, squeezed by everything above and drawn out sideways: here, against at the top.
Ash, unnamed. No match in any catalogue. Bagged as 7B-0371-T for the microprobe.
The air in these bubbles is squeezed so hard that the core cracks as it relaxes at the surface. Runs come up fractured, sometimes in discs. They are handled in mittens, logged fast and left to rest a full season before anyone dares to cut them.
“Day 27. Run 163 arrived as poker chips. Nobody spoke. I numbered every piece in pencil.”
I. S-O. · field log
They fade. Under this pressure the air stops being a bubble and moves into the crystal lattice itself, as clathrate. The core turns glass-clear. The old air is still there; it has only stopped being visible.
Above this line, the mild and steady climate we live in. Below it, snow that fell in the last glacial period: colder (watch the isotope trace step down), drier, windier. The dust bands thicken. A colder world was a dustier one.
“Day 41. The drill came up smelling of nothing, which is what twelve thousand years smells like.”
I. S-O. · field log
A third ash. A full centimetre, coarse. Something large, a long time ago, not far away.
Hair-thin. A year is now . A long human life fits in less than a metre of core.
Silt first, then grit, then pebbles the size of a thumbnail, dragged up from the bed and frozen in. The layers are folded over one another here. Nobody can date them any more; the count stops.
“Day 52. Last run. The cutters bit rock at 800.0 and the cable went slack. Brown grit in the chips. We stood round the barrel as if it were a fire.”
I. S-O. · field log
Below this there is no more winter to read. Eight hundred metres, some twenty-seven thousand snowfalls, boxed in one-metre lengths and flown out cold.
Halvard Dome, core 7B and Dr. Ingrid Solheim-Okafor are invented, and so is every number on this sheet. The physics is not.