018 – Sound in the deep ocean with David Barclay

https://www.armatusoceanic.com/podcast/018-sound
 
We think of the deep sea as an eerily quiet and spooky place but that isn’t completely true, animal communication, seismic activity, human noise and even the sound of rain and waves from 10 km above. We chat with undersea audio expert Dr David Barclay about the fascinating audio properties of the deep ocean. As we are talking audio data on an audio medium, lets have some fun with a game of ‘what can we grenad-hear’ where Thom tries to guess the deep-sea sound.
 
We also have deep-sea news: India are developing their own 6 km rated human occupied vehicle (Samudrayaan); genetics links deep-sea shrimp with their planktonic juvenile stages; the HACON project explores the Aurora black smoker field at 4000 m/13,000 ft under the Arctic; we also reveal that a mysterious squid-like creature, was, in fact, a squid.
 
We also discuss communication (through the medium of famous quotes). Are we losing the ability to actually engage and learn things from each other? Are we all just yelling at each other online from our respective teams? Not willing to really listen to the other side but rather ‘own them’ and drop the mic. In a pandemic of misinformation where a catchy meme can ruin, or even end, peoples lives do we have a duty to try to engage with people? What about the tole that takes on our own mental health?
 
Don Walsh drops by with some amazing stories from his sub commander days. A life entirely dependent on listening and being quiet. We then have a ‘tale from the high seas’ from Larkin to finish things up.
 
Feel free to get in touch with us with questions or you own tales from the high seas on:
 
podcast@armatusoceanic.com
 
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Read the show notes and find out more about us at:
www.armatusoceanic.com
 
Glossary
CTD: Conductivity, temperature and depth sensor
Gametes: sex or germ cells. Eggs and sperm
Grenadier: another name for a rattail fish
Hydrothermal vent: seawater heated by the earth flows out of the seabed
Lander: Free-falling or pop-up vehicle. Sinks from the surface and comes up again by dropping ballast
Refraction: the change in direction of a wave passing from one medium to another
Sound channel: Also called the SOFAR channel, a horizontal layer of water in the ocean at which depth the speed of sound is at its minimum
 
 
Links
Alan’s new hadal centre:
https://www.minderoo.org/deep-sea-research/
 
India’s deep sub:
https://www.wionews.com/india-news/samudrayaan-indias-first-manned-deep-sea-probe-to-travel-6-km-under-water-425414
 
Matching deep-sea shrimp with their pelagic larva:
https://www.mdpi.com/1424-2818/13/10/457/htm
 
Giant squid like creature:
https://www.timesnownews.com/the-buzz/article/viral-news-massive-squid-like-creature-larger-than-human-spotted-by-scientists-while-exploring-red-sea/822261
 
COP26 – Deep Sea World:
https://youtu.be/0oSpk1eSWMs
 
HACON project:
https://mashable.com/article/deep-sea-science-arctic
 
Forbes’ azotic theory:
https://en.wikipedia.org/wiki/Azoic_hypothesis
 
David’s other podcast: Sciographie:
https://www.dal.ca/news/2020/09/11/scientists-tell-their-own-stories-on-third-season-of-sciographie.html
 
David’s research website:
https://noise.phys.ocean.dal.ca/deepoceannoise.html
 
Implosion in the Challenger Deep paper:
https://tos.org/oceanography/assets/docs/34-2_loranger.pdf
 
Underwater noise during COVID-19:
https://asa.scitation.org/doi/full/10.1121/10.0001271
 
KM3Net: hunting for neutrinos in the deep sea:
https://www.km3net.org/
 
 
Credits
Theme – Hadal Zone Express by Märvel
Logo image
David's lander in action