Research Projects

A Generalized Micro-scale Diffusion Model

The sea-surface microlayer is a thin, organic rich film that covers virtually the entire ocean’s surface. Previous research has found the microlayer to be a zone of large chemical gradients and may be important in metal complexation. This project developed a theoretical 3-specie model against which to compare results from a microcosm. Residence times were calculated for each trace metal.

 

Photo-physiology GPP Model

This Project integrates Fast Repetition-Rate fluorometry with a photophysiology model in order to determine in situ rates of electron transport and gross primary productivity. 

 

Trace Metal Export and the Remineralization Length Scale

Preferential remineralization of biolimiting nutrients is a well document phenomenon. In this project we seek to measure the RLS and residence time for trace elements in the euphotic zone as part of a CCE-LTER process cruise. Samples were collected on 4 experimental cycles using trace metal clean sediment trap tubes and ultra-pure brine solution.

 

Investigating Inter-annual Variability in Export Efficiency

This is a regional analysis of in situ observations of export production, net primary production and remote sensing fields in order to determine the relationship between the ecosystem and export efficiency in the California Current. One goal was to determine if modes of interannual variability (e.g. ENSO) affect the export relationships since such information is key for biogeochemical models running under changing climate conditions.

 

Integrating d15N Data into Linear Inverse Ecosystem Models

LEIMs solve the inverse problem by constraining an otherwise free solution space based on mass balance, theoretical bounds and observed values. Compared to forward models, LEIMs take an agnostic perspective on parameterizing transfer functions–and therefore avoids some of the issues related to tuning even simple models. In this project we incorporated a novel algorithm to take advantage of d15N isotopic data to better constrain pelagic LIEM and other LIEMs where all endmembers are not fully constrained.

 

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