My research combines satellite products, model outputs and in situ data to study ecosystem processes, from physics to top predators and carbon export with a stronger focus on phytoplankton. I currently work with several MBARI research groups (Chavez, Haddock, Robison, Smith). Topics include physical and biological variability at regional and global scales, response to climate and ocean change, links with higher trophic levels, bioluminescence in the upper ocean, and connections between surface, midwater and benthic communities.
Current and past research projects
Large-scale climate variability and impacts on biology
- Global modes of climate variability defined from sea surface temperatures (1910-2009) and related to regional modes (e.g., ENSO, PDO, NPGO, AMO, ENSO Modoki) (webpage, Messié & Chavez 2011).
- Global-scale modes of variability in physical and biological variables (1993-2010), that capture synchronous variations associated with ENSO (first mode, Messié & Chavez 2012), and with ENSO Modoki and the NPGO (second mode, Messié & Chavez 2013).
- For a review of marine primary production in relation to climate variability and change, see Chavez, Messié & Pennington 2011.
Nitrate supply and primary production in Eastern Boundary Upwelling Systems (EBUS)
- Nitrate supply calculations from satellite winds and in situ nitrate climatologies (Messié et al. 2009).
- Seasonal regulation of primary production in EBUS based on nitrate supply and proxies for iron, light, temperature and physical export (Messié & Chavez 2015). This study showed that primary production regulation is highly variable in space and time and across systems.
- For a comparison of the four major EBUS (California, NW Africa, Peru and Benguela), see Chavez & Messié 2009.
Physical-biological interactions in the western tropical Pacific
- Seasonal cycle of satellite chlorophyll and its drivers, found to be primarily changes in horizontal advection and local upwelling (Messié & Radenac 2006).
- Model analysis of a dramatic bloom observed during the 1997-98 El Niño / La Niña transition, which was shown to be generated by an island mass effect (Gilbert Islands, Republic of Kiribati) (Messié et al. 2006). A similar bloom was observed during the 2009-10 El Niño / La Niña transition (Gierach, Messié et al. 2013).
- Description of a persistent oligotrophic zone found within the warm pool (Radenac, Messié et al. 2013). Such low chlorophyll values can be explained by a deep nutricline, the presence of a barrier layer and the remoteness of nutrient-rich areas.
- For a review of phytoplankton dynamics in the western tropical Pacific (seasonal variability, 1997-98 Kiribati bloom and westerly winds impacts), see PhD dissertation 2006 (in French).
Participation in modeling studies
- Forecasting Anchovy and Sardine Transitions (FAST)
- Salmon Applied Forecasting, Assessment and Research Initiative (SAFARI, see also Santora et al. 2013 for an evaluation of modeled zooplankton)
- Salmon Ecosystem Simulation and Management Evaluation (SESAME)
Biodiversity and ecosystems functioning
- Monterey Bay Marine Biodiversity Observing Network (MBON)
- Bioluminescence and phytoplankton/zooplankton interactions
- Integrated MBARI time series
- Phytoplankton taxa proxies from satellite and autonomous sensors
- Impact of environmental conditions on sharks distribution and diving behavior.
Recent publications (last 5 years)
Radenac, M.-H., Léger, F., Messié, M., Dutrieux, P., Menkes, C. & Eldin, G. (2016). Wind-driven changes of surface current, temperature, and chlorophyll observed by satellites north of New Guinea. Journal of Geophysical Research, 121(4), 2231–2252, doi:10.1002/2015JC011438.
Current MBARI projects
Biological Oceanography, Biodiversity and biooptics (bioluminescence), Integrated time series, CANON.