Decadal variability in North Atlantic phytoplankton blooms

摘要: [1] The interannual to decadal variability in the timing and magnitude of North Atlantic phytoplankton bloom is examined using a combination satellite data output from an ocean biogeochemistry general circulation model. as estimated chlorophyll used novel metric for validating model's skill. Maps reveal that subtropical begins winter progresses northward starting May subpolar regions. A transition zone, which experiences substantial timing, separates two Time series modeled (1959-2004) show no long-term trend toward earlier or delayed blooms any three regions considered here. However, does distinct decadal-scale periodicity, found be correlated with Oscillation (NAO) index. mechanism underpinning relationship identified anomalous wind-driven mixing conditions associated NAO. In positive NAO phases, stronger westerly winds result deeper mixed layers, delaying start spring by 2-3 weeks. region also expands during pushing zone further south central Atlantic. only weakly dependent on but more strongly layer depth. extensive bloom, particularly region, expected impact availability food higher trophic levels.