Yes,  Manos,  the  green  is due the plankton concentration. This
phenomenon  is  called  "eutrophication"  and is due the nitrogen
(nitrates and nitrites) and ammonium runoff from land to the sea;
nitrates  and  nitrites  are  widely used in agricultural fields;
also,  it  may  depend on other kind of leckage of organic matter
into   the  sea  (wasted  waters,  etc.): this nitrogen generates
plankton  "blooms"  (rapid  population  increase)  and  the water
becomes green. In Northern Europe (such as in the Baltic Sea) the
water is always so except a few days during the later summer.

The blue pictures were taken at higher depth and the blueish tone
depend  on the light: blue and ultra-violet wavelengths penetrate
deeper  than  red  into  water.  If  you  do  not  use filters to
compensate the color balance, all of the pictures/videos you take
at 35-40 and deeper will be blue.

When  the sea water is poor in plankton (like in Canary Islands),
it is transparent.

All i all, Manos, if you want good viz come to the Canary islands
but HEY! dont you forget the trimix at home!!

cheers,

       Aldo

aldo.solari@ho*.se*
www.ccbb.ulpgc.es/fish-ecology/solaris
___
Canary Islands 
Latitude  27º 37' -  29º 25' North, 
Longitude 13º 20' -  18º 10' West

cytech@ma*.co*.cy*

MM> Hehe ok this may sound silly to some people but for God sake what is
MM> causing the green tone in the water is it plangton ?

MM> Why do we have dark to light blue waters in the Mediteranean at least
MM> around
MM> Cyprus all my pics and Videos have a bluuueee backround !!!
MM> Noo!! This dark blue never disapears not even when is cloudy or pissing
MM> down the  rain ..

MM> Apologies for sending Html ....
MM> Manos Manoli.
MM> Limassol Cyprus.
MM>                         Wreck Diving  in the
MM> US                                                         One of my
MM> recent wreck dives.
MM>                [Image]                            [Image]


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