| Climate forcing of C. finmarchicus populations of the North Atlantic |
| The three-gyre hypothesis |
| Climatological C. finmarchicus distributions |
| GLOBEC study sites in the North Atlantic |
| Genetic basis for the three-gyre hypothesis |
| Life cycle of Calanus finmarchicus |
| C. finmarchicus climatology:
Globec Broadscale surveys 1995-1999 |
| C. finmarchicus model |
| C. finmarchicus solution: January- June |
| Inferred Mortality |
| Are the inverse solutions ecologically realistic? |
| January-June average mortality rate |
| Term-by-term analysis |
| A numerical experiment: turn off the upstream sources of C. finmarchicus to GB |
| Spatially averaged mortality rate |
| Biological control of the vernal population increase of C. finmarchicus on Georges Bank |
| Climatological C. finmarchicus distributions |
| Overall Objectives |
| Inversions of the Òmean stateÓ | ||
| Climatological mean seasonal forcing | ||
| Diapause entry hypotheses: food, photoperiod | ||
| Diapause exit hypotheses: development, photoperiod | ||
| Control parameter: mortality (spatially variable, stage dependent | ||
| Skill assessment: cross-validation | ||
| Use the genetic data to estimate the rate of population exchange between gyres, and compare with model predictions of same | ||
| Investigate interannual to decadal variability | ||
| High-NAO state vs. low-NAO state | ||
| Hindcast 1950s-present | ||
| Interannual to interdecadal variability |
| Initial Objectives – Year 1 |
| (1) Configure climatological model (Julia) | ||
| (2) Assemble CPR observations (Dennis/Peter/Gregory) | ||
| (3) Use the genetic data to estimate exchange between gyres (Ann) | ||
| (4) Synthesize Globec data: (Peter/Nancy) | ||
| - stage resolution | ||
| - vertical distribution | ||
| (5) Initial inversion (Dennis/Keston/Dale/Julia) | ||
| Climatological mean seasonal forcing | ||
| CPR C6 surface data only | ||
| No population dynamics | ||
| Control parameter: spatially variable source (molting flux) / sink (mortality) | ||
| C. finmarchicus abundance,
1958-2007 Compiled by Gregory Beaugrand |
| END |