Climate Variability and Phytoplankton Composition in the Pacific Ocean Presented by James Acker Authors: Rousseaux C.S., Gregg W.W., Gregory G. Leptoukh.

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Presentation transcript:

Climate Variability and Phytoplankton Composition in the Pacific Ocean Presented by James Acker Authors: Rousseaux C.S., Gregg W.W., Gregory G. Leptoukh 2012 Online Giovanni Workshop September 25-27, 2012, Greenbelt, MD Chlorophyll a, NASA Ocean Color El Niño La Niña 1

El Niño Seabird abundance and anchoveta and sardine landings from Peru (Chavez et al. 2003) 2

When it comes to feeding fishes, all phytoplankton are not equal… Cyanobacteria Diatoms Coccolithophores Chlorophytes Chlorophyll a 3

Are El Niño conditions unfavorable to all phytoplankton groups or only some? 4

pCO 2 NutrientsPhytoplankton Diatoms Chloro, Cocco, Cyano DIC Fe, NO3, NH4 Si Herbivores N/C DetritusIron Detritus Silica Detritus Clouds Precipitation water Relative humidity Ozone Wind Stress Wind speed Mixing Advection 5

Figure 2| Comparison of chlorophyll (mg m -3 ) from the assimilation model, the free-run model, and SeaWiFS. The assimilation and free-run chlorophyll distributions represent simulations for April 1, SeaWiFS data for the same day are shown for comparison, along with the monthly mean. Grey indicates land and coast, black indicates missing data, and white indicates sea ice. BiasUncertaintyN SeaWiFS-1.3% 32.7%2086 Free-run Model-1.4% 61.8%4465 Assimilation Model 0.1% 33.4%4465 6

Comparison of the free run, the multivariate and the univariate approach for chlorophyll and nutrients in the South Pacific Ocean. Time series of annual averages of (a) Chlorophyll, (b) Nitrate, (c) Silicate and (d) Iron. [Rousseaux & Gregg 2012] 7

MEI 8

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Global Phytoplankton Relative Abundance 469 observations taken from figures in peer-reviewed papers; Available at GMAO Web site How well does the NOBM compare to in situ data? 12

North Central PacificEquatorial PacificSouth Pacific Diatoms (3)-0.87 (21) (7) Chlorophytes (2) (17) (7) Cyanobacteria (24) (20) 3.20 (2) Coccolithophores 1.99 (3) (15)-2.11 (7) Percentage difference between the NOBM and the in situ data. The number of observations used for the comparison is between parenthesis Only >20% in 3 cases How well does the NOBM compare to in situ data? 13

1. Climate variability has most impact on the phytoplankton community composition in the Equatorial Pacific 2. Large Shifts are observed both on temporal and spatial scale 3. These shifts have potential important consequences for the carbon cycles and higher trophic levels Any questions? Send me an at This presentation is based on the results presented in Rousseaux, C.S. & Gregg, W.W. Climate variability and phytoplankton composition in the Pacific Ocean. Journal Of Geophysical Research. In print Conclusion: 14