File:Moon jellyfishes and sea gooseberry in Sandvik 2.jpg

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Moon jellyfishes and sea gooseberry in Sandvik, Lysekil Municipality, Sweden.

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English: Two moon jellyfishes (Aurelia aurita) and a sea gooseberry (Pleurobrachia pileus) in Sandvik, Lysekil Municipality, Sweden. The jellies are disturbing the top water layer of the fjord. The photo was taken on a calm, sunny morning after a rain, so it's likely that the layer is warmer water with some freshwater added. In this case that would make a thermocline coincide with a halocline and resulting in a very thin but visible pycnocline. This difference in density and the altered refractive index is what makes the water look "oily". The jellies are quite small and young, about 5–6 cm (2.0–2.4 in) in diameter, and since the are just below the surface and stirring up the pycnocline beneath them, that would make the layer of warmer freshwater on the fjord about 6–8 cm (2.4–3.1 in) thick at the time. The gray dots in the photo are daphnias, the fjord was full of them at the time.
Date
Source Own work
Author W.carter
Camera location58° 23′ 18.2″ N, 11° 27′ 13.18″ E Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo
This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Some debris in the water, mostly plant parts, and surface bubbles have been removed.

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Date/TimeThumbnailDimensionsUserComment
current19:23, 23 July 2020Thumbnail for version as of 19:23, 23 July 20203,211 × 3,211 (6.25 MB)W.carter (talk | contribs)Uploaded own work with UploadWizard

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