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Evaluate the impacts of tropical cyclones on the integrated sea- surface chlorophyll in the subtropical North AtlanticApproachUse 14 years of tropical cyclone track data and satellite chlorophyll data for the period 1998-2011 Use high resolution HYCOM ocean reanalysis data for the 5-year period 2008-2013Estimate tropical cyclone-induced mixed layer depth anomalies and their interannual variability Compute the interannual variability in the seasonal and area-averaged sea-surface chlorophyll and compare it with the year-to-year variability in tropical cyclone activity

Tropical Cyclones Impacts on Sea-Surface Chlorophyll

Left: Composite mean time evolution of tropical cyclone-induced mixed layer depth anomalies computed using daily data from HYCOM ocean reanalysis. Right: Scatter between the accumulated cyclone energy and tropical cyclone season-averaged satellite sea -surface chlorophyll-a concentration.

ImpactTropical cyclones induce significant mixed layer anomalies in the Sargasso Sea—nearly 12% of the interannual variability in mixed layer depth can be explained by that from tropical cyclone activityAbout 22% of the year-to-year variability in tropical cyclone season- and area-averaged sea-surface chlorophyll can be accounted for by tropical cyclones, with potential implications to oceanic carbon sequestration and global carbon cycle.

Foltz GR, K Balaguru, and LR Leung. 2015. “A Reassessment of the Integrated Impact of Tropical Cyclones on Sea Surface Chlorophyll in the Western Sub-Tropical North Atlantic.”

Geophysical Research


42. DOI: 10.1002/2015GL063222

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