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Isoprene emission from phytoplankton monocultures: the relationship with chlorophyll- a , cell volume and carbon content

Isoprene emission from phytoplankton monocultures: the relationship with chlorophyll- a , cell... Environmental context Isoprene, a natural product of both terrestrial vegetation and marine organisms, is rapidly oxidised in the atmosphere, and thereby plays a key role in the regional budget of oxidants. Although isoprene production from terrestrial plants has been extensively investigated, production processes and emission rates from marine species are still poorly understood. We present results from laboratory experiments showing that isoprene is emitted from living phytoplankton cells at variable rates depending on the light intensity, cell volume, and carbon content of the plankton cells. Abstract We report here isoprene emission rates determined from various phytoplankton cultures incubated under PAR light which was varied so as to simulate a natural diel cycle. Phytoplankton species representative of different phytoplankton functional types (PFTs) namely: cyanobacteria, diatoms, coccolithophorides, and chlorophytes have been studied. Biomass normalised isoprene emission rates presented here relative to the chlorophyll- a (Chl- a ) content of the cultures showed that the two cyanobacteria ( Synechococcus and Trichodesmium ) were the strongest emitters with emission rates in the range of 17 to 28 µg C 5 H 8 g –1 Chl- a h –1 . Diatoms produced isoprene in a significantly lower emission range: 3 to 7.5 µg C 5 H 8 g –1 Chl- a h –1 and Dunaliella tertiolecta was by far the lowest emitter of our investigated plankton cultures. Despite the group specific differences observed, a high emission rate variance was observed to occur within one phytoplankton group. However, a combination of literature and our own data showed a clear relationship between the actual cell volume and the isoprene emission rates. This relationship could be a valuable tool for future modelling approaches of global isoprene emissions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Environmental Chemistry CSIRO Publishing

Isoprene emission from phytoplankton monocultures: the relationship with chlorophyll- a , cell volume and carbon content

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Publisher
CSIRO Publishing
Copyright
CSIRO
ISSN
1448-2517
eISSN
1449-8979
DOI
10.1071/EN09156
Publisher site
See Article on Publisher Site

Abstract

Environmental context Isoprene, a natural product of both terrestrial vegetation and marine organisms, is rapidly oxidised in the atmosphere, and thereby plays a key role in the regional budget of oxidants. Although isoprene production from terrestrial plants has been extensively investigated, production processes and emission rates from marine species are still poorly understood. We present results from laboratory experiments showing that isoprene is emitted from living phytoplankton cells at variable rates depending on the light intensity, cell volume, and carbon content of the plankton cells. Abstract We report here isoprene emission rates determined from various phytoplankton cultures incubated under PAR light which was varied so as to simulate a natural diel cycle. Phytoplankton species representative of different phytoplankton functional types (PFTs) namely: cyanobacteria, diatoms, coccolithophorides, and chlorophytes have been studied. Biomass normalised isoprene emission rates presented here relative to the chlorophyll- a (Chl- a ) content of the cultures showed that the two cyanobacteria ( Synechococcus and Trichodesmium ) were the strongest emitters with emission rates in the range of 17 to 28 µg C 5 H 8 g –1 Chl- a h –1 . Diatoms produced isoprene in a significantly lower emission range: 3 to 7.5 µg C 5 H 8 g –1 Chl- a h –1 and Dunaliella tertiolecta was by far the lowest emitter of our investigated plankton cultures. Despite the group specific differences observed, a high emission rate variance was observed to occur within one phytoplankton group. However, a combination of literature and our own data showed a clear relationship between the actual cell volume and the isoprene emission rates. This relationship could be a valuable tool for future modelling approaches of global isoprene emissions.

Journal

Environmental ChemistryCSIRO Publishing

Published: Dec 21, 2010

Keywords: ocean, sea–air exchanges.

References