[Eoas-seminar] Oceanography Thesis Defense - Thomas Kelly - Apr 13, 12:35 - 327OSB

eoas-seminar at lists.fsu.edu eoas-seminar at lists.fsu.edu
Thu Apr 12 11:51:56 EDT 2018


Just a reminder that Tom's Thesis Defense is tomorrow at 12:30.  I hope 
to see you all there.

-Mike


On 4/9/2018 10:28 AM, eoas-seminar at lists.fsu.edu wrote:
>
> *ADVISOR*: Dr. Michael Stukel
>
> *DATE*/*TIME*: Friday April 13th, 12:35
>
> *ROOM*: OSB 327
>
> *TITLE*:
>
> SPATIAL AND INTERANNUAL VARIABILITY IN EXPORT EFFICIENCY AND
>
>  THE BIOLOGICAL PUMP IN AN EASTERN BOUNDARY CURRENT
>
>  UPWELLING SYSTEM WITH SUBSTANTIAL LATERAL ADVECTION
>
> *ABSTRACT*:
>
> Estimating interannual variability in carbon export is a key goal of 
> many marine biogeochemical studies. However, due to variations in 
> export mechanisms between regions, generalized models used to estimate 
> global patterns in export often fail when used for intra-regional 
> analysis. We present here a region-specific model of export production 
> for the California Current Ecosystem (CCE) parameterized using 
> intensive Lagrangian process studies conducted during El Niño-Southern 
> Oscillation (ENSO) warm and neutral phases by the CCE Long-Term 
> Ecological Research (LTER) program. We find that, contrary to 
> expectations from prominent global algorithms, export efficiency 
> (e-ratio = export / primary productivity) is positively correlated 
> with temperature and negatively correlated with net primary 
> productivity (NPP). We attribute these results to the substantial 
> horizontal advection found within the region, and verify this 
> assumption by using a Lagrangian particle tracking model to estimate 
> water mass age. We further suggest that sinking particles in the CCE 
> are comprised of a recently-produced, rapidly-sinking component 
> (likely mesozooplankton fecal pellets) and a longer-lived, 
> slowly-sinking component that is likely advected long distances prior 
> to export. We determine a new algorithm for estimating particle export 
> in the CCE from NPP (Export = 0.08 x NPP + 72 mg C m^-2 d^-1 ). We 
> apply this algorithm to a two-decade long time series of NPP in the 
> CCE to estimate spatial and interannual variability across multiple 
> ENSO phases.
>
>
>
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-- 
Mike Stukel
Assistant Professor
Florida State University
Earth, Ocean, and Atmospheric Science

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