User talk:Ajlarson99/sandbox

Review of Epilimnion

Hi User:Ajlarson99, great work on improving the page for Epilimnion - the page was quite sparse and I think you did a good job of improving the page structure and adding relevant information. The page structure should be useful for expanding out the hypolimnion page as well (which is also quite sparse at the moment). I'm a data scientist at the USGS and I've added some suggestions below that I hope will improve your additions.

• In the first sentence, you might state that the epilimnion is "above the deeper metalimnion and hypolimnion."
• In the second sentence of the first paragraph, I think it should state "It is typically warmer and has..." rather than "It is warmer and typically has..." Lakes can have inverse stratification during the winter where the epilimnion is colder (near 0 C) but less dense than the warmer hypolimnion water (e.g. https://www.rmbel.info/primer/stratification-and-mixing/)
• I suggest removing ", but is always present in those types of lakes." at the beginning of the Properties paragraph since that is redundant with the first part of that sentence - stratification implies the lake has layers, so this doesn't need to be explicitly stated.
• I suggest removing the bold effect on the words in the paragraphs of your article - I'm not sure if you're bolding these to indicate hyperlinks to other articles later, but they shouldn't be bolded in my opinion.
• You could hyperlink to turbulence when talking about epilimnion and being open to wind action. The wind action and convection creates turbulence in the epilimnion which results waves / and increased aeration.
• The epilimnion is on top of the metalimnion (which contains the thermocline), so I suggest stating "On the bottom side of the epilimnion is the metalimnion, which contains the thermocline". The metalimnion is often defined as an area (top and bottom depths) where the change in density of water exceeds a certain threshold and the thermocline (one depth) is the point of greatest density change. however, there can be nuance in the methods for calculating the depths - see discussion of the thresholds here
• In the lake turnover and mixing section, you might want to add one sentence stating that the lake can have inverse stratification during the winter, where the epilimnion has cooler water than the warmer but more dense hypolimnion.
• For the chemistry section, it is an incorrect statement that warmer waters hold more dissolved gases than colder water (it is the opposite). see https://en.wikipedia.org/wiki/Solubility#Solubility_of_gases . I think you should state that the amounts of dissolved O2 and CO2 in the epilimnion is in constant exchange with the atmosphere and can have significantly different concentrations than other lake layers. Sometimes these concentrations are higher than the hypolimnion (which is often the case for O2) but sometimes they are lower than the hypolimnion (which is often the case for CO2).
• good section on the biology. well done

Let me know if you have any questions / concerns with my comments. Jayzlimno (talk) 19:20, 30 April 2021 (UTC)

		The Limnology and Oceanography Barnstar
		Nice work! Jayzlimno (talk) 19:20, 30 April 2021 (UTC)