Raised Beaches Podcast: Episode 5

For a full list of references, see my website: https://raisedbeaches.net/2025/03/09/raised-beaches-podcast-episode-5/

Listen here: https://raisedbeaches.buzzsprout.com/

Watch here: https://www.youtube.com/@evangowan

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Episode 5 - Intro
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I discuss what I have been doing from late December 2024 to the end of February 2025, including watching Sakurajima volcano erupt, and an earthquake I felt in January. I discuss downloading sediment core data from NOAA and the attacks on the government science institutions in the United States. Finally, I have a discussion on DEI.

My recently published papers:

- Rovere et al (2025): https://doi.org/10.1016/j.geomorph.2025.109659
- Gowan et al (2025): https://doi.org/10.1186/s40645-024-00681-4

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Episode 5 Deep Dive - Greenhouse Effect
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I introduce the Greenhouse Effect, and why even though the concentration of greenhouse gases are small, they play a large role in keeping the planet at a livable temperature.

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Episode 5 - More on the Greenhouse Effect
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I discuss the historical background on how the Greenhouse Effect was discovered, as well as how it came to be called the "greenhouse effect". I also discuss the greenhouse effect on Venus and Mars.

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Episode 5 - Papers
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The first paper I go over is on determining paleo sea level from a beach ridge in Argentina. This research was part of the WARMCOASTS project, which I was part of. I briefly go through four other papers.

References:

- Rovere et al (2025): https://doi.org/10.1016/j.geomorph.2025.109659
- Barker et al (2025): https://doi.org/10.1126/science.adp3491
- Creel et al (2024): https://doi.org/10.1038/s41467-024-54535-0
- de Wit et al (2025): https://doi.org/10.5194/essd-17-545-2025
- Vacchi et al (2025): https://doi.org/10.1038/s41467-025-56721-0

Thanks to Alessio Rovere for some of the pictures used here, and of course for being a great mentor on investigating raised coastal deposits!

WARMCOASTS - Sea level and extreme waves in the Last Interglacial: This project received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement no. 802414)

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Thank you to:
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Raised Beaches Podcast logo by Aurooj: https://www.instagram.com/artbytinyleaf/
Sean for the Raised Beaches Podcast theme song
That Blasted Salami, who helped me get started: https://www.youtube.com/channel/UC5GTc4yWm-yiBFTuV3MsGaQ

Follow Dr. Evan J. Gowan on social media:

Mastodon: @DrEvanGowan@fediscience.org

Bluesky: @evangowan.bsky.social

The deep dive of episode 4 is on Milankovitch Cycles. For a full list of references, see the post on my website: https://raisedbeaches.net/2024/12/30/raised-beaches-podcast-episode-4/

Listen here: https://raisedbeaches.buzzsprout.com/

Watch here: https://www.youtube.com/@evangowan

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Episode 4 - Intro
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I discuss what I have been doing in November and December 2024, as well as an overview of all of 2024.

- Current work on ice sheet reconstructions.
- Trip to Okinawa and a discussion on the sea level indicators there, based on beachrock.
- Some discussion of the Aso Caldera in Kyushu.
- The anomalously hot water around Japan, and how it is affecting the fisheries.
- The ammonite fossil exhibit at Kumamoto University.
- Overview of my activities in 2024.


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Episode 4 Deep Dive - Milankovitch Cycles
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I introduce Milankovitch Orbital Theory and Milankovitch Cycles, and why orbital variability is the main control on paleoclimate changes. I also give examples of well known proxy records that demonstrate Milankovitch Cycles.

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Episode 4 - More on Milankovitch Cycles
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I discuss about James Croll's hypothesis on orbital changes being responsible for climate changes, which predates Milankovitch's theory, Charles Darwin's remarks on it, as well as why it was not accepted. I also discuss Milankovitch Cycles on Mars.


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Episode 4 - Papers
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I discuss a paper that I am coauthor on, led by Karla Rubio-Sandoval, which is an investigation of four raised beach/shoreline deposits in Camarones, Argentina. This research was part of the WARMCOASTS project, which I was part of.

References:

- Rubio-Sandoval et al (2024) - Quaternary and Pliocene sea-level changes at Camarones, central Patagonia, Argentina: https://doi.org/10.1016/j.quascirev.2024.108999

Thanks to Alessio Rovere for some of the pictures used here, and of course for being a great mentor on investigating raised coastal deposits!

WARMCOASTS - Sea level and extreme waves in the Last Interglacial: This project received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement no. 802414)

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Thank you to:
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Raised Beaches Podcast logo by Aurooj: https://www.instagram.com/artbytinyleaf/
Sean for the Raised Beaches Podcast theme song
That Blasted Salami, who helped me get started: https://www.youtube.com/channel/UC5GTc4yWm-yiBFTuV3MsGaQ

Follow Dr. Evan J. Gowan on social media:

Mastodon: @DrEvanGowan@fediscience.org

Bluesky: @evangowan.bsky.social

The deep dive of episode 3 is on proxy records.

For a full list of references, see the post on my website: https://raisedbeaches.net/2024/11/01/raised-beaches-podcast-episode-3/

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Episode 3 - Intro
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I discuss about how autumn is late coming to Japan, and my geological observations from my recent trip to Nagasaki. I talk about the devastating hurricanes in the southeastern United States, and how Hurricane Helene affected the National Centers for Environmental Information (NCEI). I discuss a newly published paper on the rate of sea level rise. Finally, I introduce the Global Self-consistent, Hierarchical, High-resolution Geography Database, and some of the issues I have had with it.

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Episode 3 Deep Dive - Proxy Records
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I introduce what proxy records are and give some examples about what kind of proxy records paleoclimate scientists use to infer past climate.

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Episode 3 - More on Proxy Records
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I give some background on how I learned about proxy records. I also describe the most famous proxy record, LRO4. Finally I discuss the end of the JOIDES Resolution, and the costs of collecting proxy records.

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Episode 3 - Papers
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I discuss a paper I am coauthor on about methane fluxes in Beringia, a glacial and sea level history of southern Banks Island and the Amundsen Gulf in northwestern Canada, and a 485 million year surface temperature reconstruction.

- Fuchs et al (2024), Methane flux from Beringian coastal wetlands for the past 20,000 years: https://doi.org/10.1016/j.quascirev.2024.108976
- Vaughan et al (2024), Passage and removal of the Amundsen Gulf Ice Stream, NW Laurentide Ice Sheet, recorded by the glacial and sea level history of southern Banks Island, Arctic Canada: https://doi.org/10.1016/j.quascirev.2024.108880
- Judd et al (2024), A 485-million-year history of Earth's surface temperature: https://doi.org/10.1126/science.adk3705

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Thank you to:
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Raised Beaches Podcast logo by Aurooj: https://www.instagram.com/artbytinyleaf/
Sean for the Raised Beaches Podcast theme song
That Blasted Salami, who helped me get started: https://www.youtube.com/channel/UC5GTc4yWm-yiBFTuV3MsGaQ

Follow Dr. Evan J. Gowan on social media:

Mastodon: @DrEvanGowan@fediscience.org

Bluesky: @evangowan.bsky.social