Mondiale algenbloei. Mogelijk of niet.

[Gelukkoos]

Is een algenbloei mogelijk over de ganse planeet in alle zeeën en oceanen ten gevolge van de opwarming van de aarde? Ik weet dat dit doemdenken is. Maar toch.

[Coleoptaat]

Dat lijkt mij erg onwaarschijnlijk. Voor algenbloei ligt meestal een voedseloverschot (stikstof en fosfaat) aan de basis. Dat is in grote zeeën en oceanen vrijwel niet te realiseren door diverse stromingen.

[new holland]

Op somminge plaatsen in de oceaan waar waterstromen tegen elkaar botsen en zo mineralen naar de fotische zone van de oceaan brengen zou een algen bloei kunnen ontstaat. Wat er dan gebeurt is dat er meer voedsel is voor andere dieren en zo terug een evenwicht instellen. Niet slecht voor de honger in de wereld. Als er dan nog een algenbloei zou ontstaan kunnen we er nog groene stroom mee maken.

[barthol]

Als ik het goed begrijp is zoiets in het verleden wel gebeurd. Gerelateerd aan een Super-Greenhouse Event en een Oceanic Anoxic Event.

fragment uit Wikipedia/Anoxic-Event :

This is a recent understanding. This picture was only pieced together during the last three decades. The handful of known and suspected anoxic events have been tied geologically to large-scale production of the world's oil reserves in worldwide bands of black shale in the geologic record. Likewise the high relative temperatures believed linked to so called "super-greenhouse events"^[6] Oceanic anoxic events^[3] were in all likelihood caused or stimulated by extreme episodes of volcanic outgassing. These events contributed to the characteristic elevated carbon dioxide levels four to six times current levels that are attributed to these periods. At even a few degrees warmer, rain forests are extremely vulnerable to fire hazards. These forests have little natural resistance to fires,^[6] and some conjecture a critical tipping point. Practically overnight the increase of temperature might have been reached and triggered a huge burn-off^[6] of planetary forests. This would have released unprecedented amounts of carbon dioxide into the atmosphere. With a change of mean temperatures of three degrees Celsius, the ice caps melted. This triggered a runaway effect. In the super-greenhouse ecologies—the term meaning average temperature rose to or beyond six degrees above today—the seas were so warm, it is believed the water temperatures at the two poles^[7] were in the lower 80s°F (i.e. above 27 °C).^[3] The Cretaceous and Jurassic periods' world ecologies were essentially ice free,^[3] had massive storms driven by warm oceans, and were dying from the double hit^[3] of lack of oxygen and toxic hydrogen sulfide accumulations at lower layers because of a shut down in the ocean conveyor belts.^[3] In this time, most of the world would experience the highly noxious scent of rotten eggs and the seas would have slowly acquired a deep green hue from the high amounts of algae.

Boeiend is ook de ABC-science documentaire: Crude - The incredible journey of Oil