Publications 2014

​From silk to satellite; a half century of ocean colour changes in the Northeast Atlantic
D. Raitsos, P. Yaswant, S. J. Lavender, I. Hoteit, A. McQuatters-Gollop, P.C. Reid, and A.J. Richardson
Global Change Biology, Volume 20, Issue 7, Pages 2117-2123, 2014
D. Raitsos, P. Yaswant, S. J. Lavender, I. Hoteit, A. McQuatters-Gollop, P.C. Reid, and A.J. Richardson
Chlorophyll; Northeast Atlantic; Northern hemisphere temperature; Ocean colour; Phytoplankton variability
2014
Changes in phytoplankton dynamics influence marine biogeochemical cycles, climate processes, and food webs, with substantial social and economic consequences. Large-scale estimation of phytoplankton biomass was possible via ocean colour measurements from two remote sensing satellites - the Coastal Zone Colour Scanner (CZCS, 1979-1986) and the Sea-viewing Wide Field-of-view Sensor (SeaWiFS, 1998-2010). Due to the large gap between the two satellite eras and differences in sensor characteristics, comparison of the absolute values retrieved from the two instruments remains challenging. Using a unique in situ ocean colour dataset that spans more than half a century, the two satellite-derived chlorophyll-a (Chl-a) eras are linked to assess concurrent changes in phytoplankton variability and bloom timing over the Northeast Atlantic Ocean and North Sea. Results from this unique re-analysis reflect a clear increasing pattern of Chl-a, a merging of the two seasonal phytoplankton blooms producing a longer growing season and higher seasonal biomass, since the mid-1980s. The broader climate plays a key role in Chl-a variability as the ocean colour anomalies parallel the oscillations of the Northern Hemisphere Temperature (NHT) since 1948.


DOI: 10.1111/gcb.12457