In case anyone is teaching a class on this topic, please consider directing your students to this news brief we prepared in November, 2006.
http://sciencebulletins.amnh.org/?sid=b.s.dead_zones.20061113&src=l --- William Silvert <[EMAIL PROTECTED]> wrote: > I don't have the material at hand, but I believe > that these calculations > have been done for the Baltic. There is a large and > growing anoxic zone > which is attributed to agricultural runoff, and I am > almost certain that the > connection has been established through quantitative > models. > > And I see no reason why these effects should be > localised. > > Bill Silvert > > ----- Original Message ----- > From: "Esat Atikkan" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Wednesday, February 13, 2008 7:04 PM > Subject: Re: Let's talk about the Gulf dead zone and > water nutrients > > > > The 'bacteria decomposing dead algae' thus > depleting O2 model could > > possibly explain local hypoxia/anoxia. However > when the O2 depleted area > > becomes as broad as that seen in the Gulf of > Mexico or in the Pacific > > Ocean, off Oregon, that model may be lacking. > > > > One approach would be to estimate the actual > amount of such algae > > reaching the bottom, and the quantity of O2 it > would take to decompose > > (via bacteria). > > > > Is anyone aware of such a quantification? > > > > Esat Atikkan > > > > William Silvert <[EMAIL PROTECTED]> wrote: > > Just to hit the first point, the reason why > hypereutrophic waters tend to > > have benthic dead zones is because they produce > too much algae, which sink > > rather than being eaten and accumulates on the > bottom. There it is > > degraded > > by bacteria, and this is the process that sucks up > the oxygen. > > > > Bill Silvert > ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs
