NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Glowing Sea Surface
From: Fred Hebard
Date: 2003 Nov 13, 08:50 -0500
From: Fred Hebard
Date: 2003 Nov 13, 08:50 -0500
Trevor, I was not intending to insult you, but rather to answer the question you poised a second time, after Jared & George's answer, and to point out as best I could for the whole list that a biological explanation was not unlikely. Given that a hurricane was stirring the waters, it does not appear to me you have to invoke a bloom to explain what you saw, but rather a smaller population might suffice. In addition, is there a need for the organism(s) to be alive to phosphoresce and do they need to be algae? Fred On Nov 12, 2003, at 8:21 AM, Trevor J. Kenchington wrote: > Fred, > > Marine life, of some species, thrives at temperatures down to the > freezing point of seawater. Temperature is therefore immaterial to the > issue at hand. In any case, the Harbour is still fairly warm at the > moment -- as I can confirm from personal exposure. However, algae > (assuming that the thing in question was an alga) need sunlight. The > species living in each area are adapted to use the seasonal cycles of > sunlight available in that area (along with seasonal cycles in many > other things), while light is abundant here in high summer but getting > scarce by the autumnal equinox. > > So, for the third time: In my judgement (as a professional marine > scientist), I find it a bit improbable that anything would be blooming > here in late September in sufficient abundance to produce the > appearance > of continuous light (rather than individual sparks) that I saw. Not > impossible but a bit improbable. > > I did not turn to this list for an education in marine biology. (Got > that at university, starting nearly 30 years ago.) I did think that > someone might be able to tell me whether there were possible > physico-chemical explanations for what I saw. Jared has said that, at > least where the water itself is concerned, there are not. If I get the > chance, I'll ask the phytoplankton types at my wife's research > institute > whether they can suggest a species which might have produced the light. > > > Trevor Kenchington > > > > Fred Hebard wrote: > >> Trevor, >> >> I believe marine fauna are fairly common near sea ice. This implies >> that flora are there also, at the base of the food chain. Which I >> always hear about the nutrient-rich arctic waters, where the nutrients >> in questions are minerals for the flora. So algae probably are >> abundant in your harbor until it ices over. I have no idea what ice >> would do to the light intensity in the water underneath, but it might >> knock it down enough to crash algal populations. Now what it was that >> was doing bioluminescence, I do not know. > > > > > -- > Trevor J. Kenchington PhD Gadus@iStar.ca > Gadus Associates, Office(902) 889-9250 > R.R.#1, Musquodoboit Harbour, Fax (902) 889-9251 > Nova Scotia B0J 2L0, CANADA Home (902) 889-3555 > > Science Serving the Fisheries > http://home.istar.ca/~gadus >