dc.contributor.author | Thomalla, Sandy J. | |
dc.contributor.author | Ogunkoya, A. Gilbert | |
dc.contributor.author | Vichi, Marcello | |
dc.contributor.author | Swart, Sebastiaan | |
dc.coverage.spatial | Southern Ocean | en_US |
dc.coverage.spatial | Antarctic Ocean | en_US |
dc.date.accessioned | 2020-11-02T19:13:31Z | |
dc.date.available | 2020-11-02T19:13:31Z | |
dc.date.issued | 2017 | |
dc.identifier.citation | Thomalla, S.J.; Ogunkoya, A.G.; Vichi, M,
and Swart, S. (2017) Using Optical
Sensors on Gliders to Estimate
Phytoplankton Carbon Concentrations
and Chlorophyll-to-Carbon Ratios in
the Southern Ocean.
Frontiers in Marine Science, 4:34, 19pp.
DOI: 10.3389/fmars.2017.00034 | en_US |
dc.identifier.uri | http://hdl.handle.net/11329/1436 | |
dc.identifier.uri | http://dx.doi.org/10.25607/OBP-939 | |
dc.description.abstract | One approach to deriving phytoplankton carbon biomass estimates (Cphyto) at
appropriate scales is through optical products. This study uses a high-resolution glider
data set in the Sub-Antarctic Zone (SAZ) of the Southern Ocean to compare four different
methods of deriving Cphyto from particulate backscattering and fluorescence-derived
chlorophyll (chl-a). A comparison of the methods showed that at low (<0.5mg m−3)
chlorophyll concentrations (e.g., early spring and at depth), all four methods produced
similar estimates of Cphyto, whereas when chlorophyll concentrations were elevated one
method derived higher concentrations of Cphyto than the others. The use of methods
derived from particulate backscattering rather than fluorescence can account for cellular
adjustments in chl-a:Cphyto that are not driven by biomass alone. A comparison of the
glider chl-a:Cphyto ratios from the different optical methods with ratios from laboratory
cultures and cruise data found that some optical methods of deriving Cphyto performed
better in the SAZ than others and that regionally derived methods may be unsuitable for
application to the Southern Ocean. A comparison of the glider chl-a:Cphyto ratios with
output from a complex biogeochemical model shows that although a ratio of 0.02mg
chl-a mg C−1 is an acceptable mean for SAZ phytoplankton (in spring-summer), the
model misrepresents the seasonal cycle (with decreasing ratios from spring to summer
and low sub-seasonal variability). As such, it is recommended that models expand
their allowance for variable chl-a:Cphyto ratios that not only account for phytoplankton
acclimation to low light conditions in spring but also to higher optimal chl-a:Cphyto ratios
with increasing growth rates in summer. | en_US |
dc.language.iso | en | en_US |
dc.rights | Attribution 4.0 International | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | * |
dc.subject.other | Phytoplankton carbon | en_US |
dc.subject.other | Chlorophyll to carbon ratios | en_US |
dc.subject.other | Particulate backscattering | en_US |
dc.title | Using Optical Sensors on Gliders to Estimate Phytoplankton Carbon Concentrations and Chlorophyll-to-Carbon Ratios in the Southern Ocean. | en_US |
dc.type | Journal Contribution | en_US |
dc.description.refereed | Refereed | en_US |
dc.format.pagerange | 19pp. | en_US |
dc.identifier.doi | 10.3389/fmars.2017.00034 | |
dc.subject.parameterDiscipline | Parameter Discipline::Biological oceanography::Phytoplankton | en_US |
dc.subject.instrumentType | Gliders | en_US |
dc.subject.dmProcesses | Data Management Practices::Data acquisition | en_US |
dc.bibliographicCitation.title | Frontiers in Marine Science | en_US |
dc.bibliographicCitation.volume | 4 | en_US |
dc.bibliographicCitation.issue | Article 34 | en_US |
dc.description.sdg | 14.A | en_US |
dc.description.eov | Phytoplankton biomass and diversity | en_US |
dc.description.maturitylevel | TRL 7 System prototyping demonstration in an operational environment (ground or space) | en_US |
dc.description.bptype | Manual (incl. handbook, guide, cookbook etc) | en_US |
dc.description.bptype | Standard Operating Procedure | en_US |
obps.contact.contactname | Sandy J. Thomalla | |
obps.contact.contactemail | sthomalla@csir.co.za | |
obps.resourceurl.publisher | https://www.frontiersin.org/articles/10.3389/fmars.2017.00034/full | en_US |