Sentences with phrase «ocean calcareous»
The main carbon sink is ocean calcareous phytoplankton like coccolithophores, and diatoms.
https://wattsupwiththat.com/ Not exact matches
In a new study recently published in the journal Global Biogeochemical Cycles, scientists of Kiel University (CAU) with colleagues from GEOMAR Helmholtz Centre for Ocean Research Kiel and international partners from the USA, New Zealand, and Great Britain studied marine benthic shell - forming organisms around the world in relation to the chemical conditions they currently experience — with a surprising result: 24 percent, almost a quarter of the analyzed species, including sea urchins, sea stars, coralline algae or snails, already live in seawater unfavorable to the maintenance of their calcareous skeletons and shells (a condition referred to as CaCO3 - undersaturation).
This process, termed ocean acidification, makes it energetically more costly for calcifying organisms to form their calcareous shells and skeletons.
The reason is that Emiliania's dense calcareous platelets function as ballast in aggregated organic matter and accelerate its sinking to the deep ocean.
Pre-bomb radiocarbon and the reservoir orrection for calcareous marine species in the Southern Ocean.
Raised CO2 in aquatic systems can also lead to physiological stress, difficulty in building calcareous shells etc. (as will happen if atmospheric CO2 continues to build up beyond around 700ppm - the so called ocean acidification effect).
Calcareous nannofossils from approximately the past 7000 yr of the Holocene and from oxygen isotope stage 5 are present at 39 analyzed sites in the central Arctic Ocean.
Without knowing if, for example, industrialised agriculture has tipped the oceans from calcareous phyto production to silicaceous diatoms, and thus reduced light C pulldown, I can not understand how we can assign the increase just to what is coming out of our chimneys.
Ocean acidification is often considered in terms of its direct negative effects on the growth and calcification of organisms with calcareous shells or skeletons.