Talk:Underwater

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WikiProject Scuba diving (Rated Start-class, Low-importance)
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Untitled[edit]

Mark,

The changes/additions you made are good. However, some are quite a bit off the subject. This article is about conditions underwater and not about all things oceanographic (like tides and waves and currents), which are covered in other articles. If the discussion gets that broad, then the page will need to be merged into an oceanography page. - Marshman 16:50, 24 May 2004 (UTC)

Why are the pictures so sterile, there is virtually no organic life in them, could at least have more life on one of them and perhaps a deep sea pic, of course such a photo may be difficult to obtain /Minoya 09:28, 14 December 2006 (UTC)

"In fact, 75% of the water in the world ocean (the great depths) has a temperature between 0 °C and 2 °C." Does not deep ocean water have a temperature of around 4 Celsius? Water is at its most dense at this temperature. Deep water with a temperature below 4 Celsius would float upwards either to be warmed or to float near the surface as icebergs or a colder water layer. This is the case for fresh water lakes but, I don't know, maybe it is different for seawater?

"It is also impossible to shout underwater without drowning."
Why ? 74.56.90.14 —Preceding unsigned comment added by 74.56.90.14 (talk) 20:46, 3 September 2007 (UTC)

Euphotic depth[edit]

"At 100 m (330 ft) the light present from the sun is about 0.5% of that at the surface." "The euphotic depth is the depth at which light intensity falls to 1% of the value at the surface. ... [the euphotic depth may] reach 200 meters in the open ocean." These two paragraphs seem contradictory. Maybe there's a better way of phrasing them? Greylurk (talk) 00:12, 18 October 2011 (UTC)

The way I read it, the "0.5% at 100 metres" is a sort of general or average value, while the "1% at 200 metres" seems to be a maximum. I'll copyedit to see if that is clearer. However, as neither of the statements are sourced, there's no reason why they shouldn't simply be removed if they are confusing. --RexxS (talk) 00:33, 18 October 2011 (UTC)

How come that the "equivalent" to surface atmospheric pressure would be found "10m" below, but at that depth there can already be "ruptures" in the ear's membrane?

Transmission[edit]

...in the very clear water of the open ocean less than 25% of the surface light reaches a depth of 10 m (33 feet). At 100 m (330 ft) the light present from the sun is normally about 0.5% of that at the surface. Where do these numbers come from and to what do they refer? Does "25%" refer to the total solar irradiation integrated over the full spectrum, or weighted to the photosynthesis action spectrum, or to the human vision action spectrum (i.e. the illumination perceived by a diver)? Due to the extreme wavelength dependence of light transmission in water (see Electromagnetic absorption by water) these numbers will differ greatly, and will be largest for photosynthesis due to the blue peak in the action spectrum.--SiriusB (talk) 08:13, 28 July 2013 (UTC)

Assessment comment[edit]

The comment(s) below were originally left at Talk:Underwater/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.

A great start with lots of easily-expandable content. Sections need to be utilized more, as do wikilinks and references. -Pumpmeup 05:35, 22 November 2007 (UTC)

Last edited at 05:35, 22 November 2007 (UTC). Substituted at 20:18, 1 May 2016 (UTC)

What is the scope of this article?[edit]

It seems to be a pastiche of vaguely connected statements with little logical structure. • • • Peter (Southwood) (talk): 14:42, 28 June 2016 (UTC)