Woods Hole Oceanographic Institution

Ke Chen

»The role of atmospheric forcing versus ocean advection during the extreme warming of the Northeast U.S. continental shelf in 2012
»Mean circulation in the coastal ocean off Northeastern North America from a regional-scale ocean model
»Diagnosing the warming of the Northeastern U.S. Coastal Ocean in 2012: A linkage between the atmospheric jet stream variability and ocean response
»Data assimilative modeling investigation of Gulf Stream Warm Core Ring interaction with continental shelf and slope circulation
»Seasonal and Interannual Variability of Physical and Biological Dynamics at the Shelfbreak Front of the Middle Atlantic Bight: Nutrient Supply Mechanisms
»Mesoscale Variations of Sea Surface Temperature and Ocean Color Patterns at the Mid-Atlantic Bight Shelfbreak
»Numerical Investigation of the Middle Atlantic Bight Frontal Circulation using a High Resolution Ocean Hindcast Model

Chen K., G. G. Gawarkiewicz, Y.-O. Kwon, W. G. Zhang, The role of atmospheric forcing versus ocean advection during the extreme warming of the Northeast U.S. continental shelf in 2012, Journal Of Geophysical Research, doi: 10.1002/2014JC010547, 2015

In the coastal ocean off the Northeast U.S., the sea surface temperature (SST) in the first half of 2012 was the highest on the record for the past roughly 150 years of recorded observations. The underlying dynamical processes responsible for this extreme event are examined using a numerical model, and the relative contributions of air-sea heat flux versus lateral ocean advective heat flux are quantified. The model accurately reproduces the observed vertical structure and the spatiotemporal characteristics of the thermohaline condition of the Gulf of Maine and the Middle Atlantic Bight waters during the anomalous warming period. Analysis of the model results show that the warming event was primarily driven by the anomalous air-sea heat flux, while the smaller contribution by the ocean advection worked against this flux by acting to cool the shelf. The anomalous air-sea heat flux exhibited a shelf-wide coherence, consistent with the shelf-wide warming pattern, while the ocean advective heat flux was dominated by localized, relatively smaller scale processes. The anomalous cooling due to advection primarily resulted from the along-shelf heat flux divergence in the Gulf of Maine, while in the Middle Atlantic Bight the advective contribution from the along- and cross-shelf heat flux divergences were comparable. The modeling results confirm the conclusion of the recent analysis of in situ data by Chen et al. (2014a) that the changes in the large-scale atmospheric circulation in the winter of 2011-2012 primarily caused the extreme warm anomaly in the spring of 2012. The effect of along-shelf or cross-shelf ocean advection on the warm anomalies from either the Scotian Shelf or adjacent continental slope was secondary.

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