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| Sadeghi, A.; Dinter, T.; Vountas, M.; Taylor, B. B.; Altenburg-soppa, M.; Peeken, Ilka; Bracher, Astrid. |
| The goal of this study was to improve PhytoDOAS, which is a new retrieval method for quantitative identification of major phytoplankton functional types (PFTs) using hyper-spectral satellite data. PhytoDOAS is an extension of the Differential Optical Absorption Spectroscopy (DOAS, a method for detection of atmospheric trace gases), developed for remote identification of oceanic phytoplankton groups. Thus far, PhytoDOAS has been successfully exploited to identify cyanobacteria and diatoms over the global ocean from SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) hyper-spectral data. This study aimed to improve PhytoDOAS for remote identification of coccolithophores, another functional group of phytoplankton. The main... |
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| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00266/37692/36870.pdf |
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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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| Yassaa, Noureddine; Peeken, Ilka; Zoellner, Eckart; Bluhm, Katrin; Arnold, Steve; Spracklen, Dominick; Williams, Jonathan. |
| Laboratory incubation experiments and shipboard measurements on the Southern Atlantic Ocean have provided the first evidence for marine production of monoterpenes. Nine marine phytoplankton monocultures were investigated using a GC-MS equipped with an enantiomerically-selective column and found to emit at rates, expressed as nmol C(10)H(16) (monoterpene) g [chlorophyll a](-1) day(-1), from 0.3 nmol g [chlorophyll a](-1) day(-1) for Skeletonema costatum and Emiliania huxleyi to 225.9 nmol g [chlorophyll a](-1) day(-1) for Dunaliella tertiolecta. Nine monoterpenes were identified in the sample and not in the control, namely: (-)-/(+)-pinene, myrcene, (+)-camphene, (-)-sabinene, (+)-3-carene, (-)-pinene, (-)-limonene and p-ocimene. In addition, shipboard... |
| Tipo: Text |
Palavras-chave: Algae; Isoprene; Organic trace gases; Southern Atlantic Ocean. |
| Ano: 2008 |
URL: https://archimer.ifremer.fr/doc/00238/34896/33131.pdf |
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