Description of the oceanographic condition off Sanriku, northwestern Pacific, and its relation to spring bloom detected by the Ocean Color and Temperature Scanner (OCTS) images

1998 ◽  
Vol 54 (5) ◽  
pp. 479-494 ◽  
Author(s):  
Denzo Inagake ◽  
Sei-ichi Saitoh
Keyword(s):  
Spring Bloom ◽  
Ocean Color ◽  
Northwestern Pacific ◽  
Oceanographic Condition ◽  
Off Sanriku

scholarly journals Analysis of 23 Years of Daily Cloud-Free Chlorophyll and Suspended Particulate Matter in the Greater North Sea

2021 ◽  
Vol 8 ◽  
Author(s):  
Aida Alvera-Azcárate ◽  
Dimitry Van der Zande ◽  
Alexander Barth ◽  
Charles Troupin ◽  
Samuel Martin ◽  
...  
Keyword(s):  
Particulate Matter ◽  
North Sea ◽  
Suspended Particulate Matter ◽  
Spring Bloom ◽  
Ocean Color ◽  
Light Availability ◽  
Good Representation ◽  
Clear Trend ◽  
Water Column Stratification ◽  
Suspended Particulate

Satellite-derived estimates of ocean color variables are available for several decades now and allow performing studies of the long-term changes occurred in an ecosystem. A daily, gap-free analysis of chlorophyll (CHL) and suspended particulate matter (SPM, indicative of light availability in the subsurface) at 1 km resolution over the Greater North Sea during the period 1998–2020 is presented. Interannual changes are described, with maximum average CHL values increasing during the period 1998–2008, a slightly decreasing trend in 2009–2017 and an stagnation in recent years. The typical spring bloom is observed to happen earlier each year, with about 1 month difference between 1998 and 2020. The duration of the bloom (time between onset and offset) appears also to be increasing with time, but the average CHL value during the spring bloom does not show a clear trend. The causes for earlier spring blooms are still unclear, although a rising water temperature can partially explain them through enhanced phytoplankton cell division rates or through increased water column stratification. SPM values during winter months (prior to the development of the spring bloom) do not exhibit a clear trend over the same period, although slightly higher SPM values are observed in recent years. The influence of sea surface temperature in the spring bloom timing appears to be dominant over the influence of SPM concentration, according to our results. The number of satellites available over the years for producing CHL and SPM in this work has an influence in the total amount of available data before interpolation. The amount of missing data has an influence in the total variability that is retained in the final dataset, and our results suggest that at least three satellites would be needed for a good representation of ocean color variability.

Sixteen-year phytoplankton biomass trends in the northwestern Pacific Ocean observed by the SeaWiFS and MODIS ocean color sensors

2016 ◽  
Vol 72 (3) ◽  
pp. 479-489 ◽  
Author(s):  
Eko Siswanto ◽  
Makio C. Honda ◽  
Kazuhiko Matsumoto ◽  
Yoshikazu Sasai ◽  
Tetsuichi Fujiki ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Phytoplankton Biomass ◽  
Ocean Color ◽  
Northwestern Pacific ◽  
Northwestern Pacific Ocean ◽  
Color Sensors
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