double diffusion – Adventures in Oceanography and Teaching

24 Days of #KitchenOceanography — Diffusive layering

mglessmer — Thu, 17 Dec 2020 07:00:57 +0000

Welcome to 24 days of #KitchenOceanography! Both English and German instructions below. Herzlich Willkommen zu 24 Tagen Küchen-Ozeanographie! Deutsche und Englische Anleitungen weiter unten. Read more about this experiment here (includes a movie and a fun out-take!). Mehr zu diesem Experiment hier (mit Film und lustigen deleted scenes!).

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Diffusive layering — a super easy experiment!

mglessmer — Thu, 17 Dec 2020 05:15:32 +0000

Day 17 of my 24 days of #KitchenOceanography is about double-diffusive layering, and the post is using “go have a nice latte” as instructions. However, in times of Covid-19 (and a hard lockdown in Germany since Wednesday) that’s unfortunately impossible. And since Lars Henrik said that he was especially curious about this experiment, and today […]

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24 Days of #KitchenOceanography — Double-diffusive mixing with cream and tea

mglessmer — Wed, 16 Dec 2020 07:00:48 +0000

Welcome to 24 days of #KitchenOceanography! Both English and German instructions below. Herzlich Willkommen zu 24 Tagen Küchen-Ozeanographie! Deutsche und Englische Anleitungen weiter unten.

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24 Days of #KitchenOceanography — Double-diffusive mixing

mglessmer — Tue, 15 Dec 2020 07:00:52 +0000

Welcome to 24 days of #KitchenOceanography! Both English and German instructions below. Herzlich Willkommen zu 24 Tagen Küchen-Ozeanographie! Deutsche und Englische Anleitungen weiter unten.

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Temperature dependency of molecular diffusion, and convection taking over

mglessmer — Mon, 06 Apr 2020 12:05:48 +0000

I saw the idea for this experiment on Instagram (Max is presenting it for @glaeserneslabor) and had to try it, too! The idea is to put drops of dye into hot and cold water and observe how in hot water the dye is mixed a lot faster than in cold water — after all, molecules […]

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Salt fingers in my overturning experiment

mglessmer — Fri, 22 Nov 2019 13:05:43 +0000

You might have noticed them in yesterday’s thermally driven overturning video: salt fingers! In the image below you see them developing in the far left: Little red dye plumes moving down into the clear water. But wait, where is the salt? In this case, the “double” in double diffusion comes from heat and dye which […]

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Ostfriesentee — Double diffusion in a tea cup

mglessmer — Fri, 26 Apr 2019 14:44:19 +0000

Showing double-diffusive mixing in tank experiments is a pain if you try to do it the proper way with carefully measured temperatures and salinities. It is, however, super simple, if you go for the quick and dirty route: Cream in tea! Even easier than the “forget the salt, just add food dye” salt fingering experiment […]

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Accidental double-diffusive mixing

mglessmer — Fri, 19 Oct 2018 09:46:52 +0000

When setting up the stratification for the Nansen “dead water” demo (that we’ll show later today, and until then I am not allowed to share any videos, sorry!), I went into a meeting after filling in layer 4 (the then lowest). When I came back, I wanted to fill in layer 5 as the new […]

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Layered latte: A great real-life example of double-diffusive mixing!

mglessmer — Sat, 25 Aug 2018 16:37:06 +0000

Sometimes sitting in a café for a work meeting with #lieblingskollegin Julia can lead to unexpected discoveries of oceanographic processes — in my latte! It’s those little things that inspire blog posts… “Kitchen oceanography” brings the ocean to your house or class room! Oceanography is often taught in a highly theoretical way without much reference to […]

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Experiment: Double-diffusive mixing (salt fingering)

mglessmer — Fri, 24 Aug 2018 05:39:02 +0000

On the coolest process in oceanography. My favorite oceanographic process, as all of my students and many of my acquaintances know, is double-diffusive mixing. Look at how awesome it is: Double-diffusive mixing happens because heat and salt’s molecular diffusion are very different: Heat diffuses about a factor 100 faster than salt. This can lead to […]

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