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| Soppa, Mariana A.; Hirata, Takafumi; Silva, Brenner; Dinter, Tilman; Peeken, Ilka; Wiegmann, Sonja; Bracher, Astrid. |
| Diatoms are the major marine primary producers on the global scale and, recently, several methods have been developed to retrieve their abundance or dominance from satellite remote sensing data. In this work, we highlight the importance of the Southern Ocean (SO) in developing a global algorithm for diatom using an Abundance Based Approach (ABA). A large global in situ data set of phytoplankton pigments was compiled, particularly with more samples collected in the SO. We revised the ABA to take account of the information on the penetration depth (Z(pd)) and to improve the relationship between diatoms and total chlorophyll-a (TChla). The results showed that there is a distinct relationship between diatoms and TChla in the SO, and a new global model... |
| Tipo: Text |
Palavras-chave: Ocean colour; Phytoplankton functional types; Diatom; Remote sensing; Chlorophyll-a. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00290/40075/39289.pdf |
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| Tilstone, Gavin; Dall’olmo, Giorgio; Hieronymi, Martin; Ruddick, Kevin; Beck, Matthew; Ligi, Martin; Costa, Maycira; D’alimonte, Davide; Vellucci, Vincenzo; Vansteenwegen, Dieter; Bracher, Astrid; Wiegmann, Sonja; Kuusk, Joel; Vabson, Viktor; Ansko, Ilmar; Vendt, Riho; Donlon, Craig; Casal, Tânia. |
| A field intercomparison was conducted at the Acqua Alta Oceanographic Tower (AAOT) in the northern Adriatic Sea, from 9 to 19 July 2018 to assess differences in the accuracy of in- and above-water radiometer measurements used for the validation of ocean colour products. Ten measurement systems were compared. Prior to the intercomparison, the absolute radiometric calibration of all sensors was carried out using the same standards and methods at the same reference laboratory. Measurements were performed under clear sky conditions, relatively low sun zenith angles, moderately low sea state and on the same deployment platform and frame (except in-water systems). The weighted average of five above-water measurements was used as baseline reference for... |
| Tipo: Text |
Palavras-chave: Fiducial reference measurements; Remote sensing reflectance; Ocean colour radiometers; TriOS RAMSES; Seabird HyperSAS; Field intercomparison; AERONET-OC; Acqua Alta Oceanographic Tower. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00629/74135/73599.pdf |
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