Marine isoprene production and consumption in the mixed layer of the surface ocean – a field study over two oceanic regions.

Booge, Dennis, Schlundt, Cathleen , Bracher, Astrid, Endres, Sonja , Zäncker, Birthe and Marandino, Christa A. (2018) Marine isoprene production and consumption in the mixed layer of the surface ocean – a field study over two oceanic regions. Open Access Biogeosciences (BG), 15 . pp. 649-667. DOI 10.5194/bg-2017-257.

[img]
Preview
Text
bg-15-649-2018.pdf - Published Version
Available under License Creative Commons: Attribution 3.0.

Download (2063Kb) | Preview

Supplementary data:

Abstract

Parameterizations of surface ocean isoprene concentrations are numerous, despite the lack of source/sink process understanding. Here we present isoprene and related field measurements in the mixed layer from the Indian Ocean and the eastern Pacific Ocean to investigate the production and consumption rates in two contrasting regions, namely oligotrophic open ocean and the coastal upwelling region. Our data show that the ability of different phytoplankton functional types (PFTs) to produce isoprene seems to be mainly influenced by light, ocean temperature, and salinity. Our field measurements also demonstrate that nutrient availability seems to have a direct influence on the isoprene production. With the help of pigment data, we calculate in-field isoprene production rates for different PFTs under varying biogeochemical and physical conditions. Using these new calculated production rates, we demonstrate that an additional significant and variable loss, besides a known chemical loss and a loss due to air–sea gas exchange, is needed to explain the measured isoprene concentration. We hypothesize that this loss, with a lifetime for isoprene between 10 and 100 days depending on the ocean region, is potentially due to degradation or consumption by bacteria.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
AWI
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/bg-2017-257
ISSN: 1726-4170
Expeditions/Models/Experiments:
Date Deposited: 03 Jul 2017 09:58
Last Modified: 23 May 2019 12:06
URI: http://oceanrep.geomar.de/id/eprint/38746

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...