Lucy Carpenter
speaker
271 appearances
1 recordings
1 series
first heard May 2026
last heard 11 May
Lucy Carpenter’s voice in public audio — every appearance, attributed to the second.
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recordings per month · last 12 monthsRecordings per month over the last 12 months — 1 in all, peaking in May 2026 with 1.
Appearances
And it turned out the chemistry linked the iodine emissions from the seaweed particles
to these aerosol particles.
Now we think it's not just happening above seaweed beds, but also over the wider open ocean as well.
A really key thing is how you sample.
If a gas is very reactive, you might need an inlet that's only a centimetre long and a special way of making sure the gas or radical is not lost before it gets into your system.
So for some very reactive things, we actually have to put the instrument itself on the roof or on the sampling tower.
Other molecules, you can essentially have a great big manifold, suck the air down, you pump the air in, trap it, concentrate it often, because if you're measuring at that tiny, tiny level...
You can't just put something straight through into your instrument.
You have to concentrate it until you've got enough of it.
Get rid of the things you don't need, like the CO2 and the nitrogen and the oxygen, and then just inject what you want.
So that's how we tend to do lots of science.
Absolutely.
So the seaweeds, they actually accumulate huge amounts of iodine and bromine sometimes as part of what biologists call the oxidative stress response.
So they don't like being exposed to dry, sunny air.
They like being in the sea.
So when they're out, they actually have a whole reactive chemistry going on.
And their release of these halogens is part of their response to get rid of things like hydrogen peroxide from their system.
But yeah, the molecules that we're seeing are...
The chemicals that they are emitting that then react with organic material in the seawater.
And together, those things make these very, you know, exotic mixed organic halogens that we saw and other halogens that we didn't see at the time, but later found out were being emitted as well.
Showing 81–100 of 271 · page 5 of 14
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