IFES-GCOE グローバルCOEプログラム 「統合フィールド環境科学の教育研究拠点形成」
         北海道大学大学院環境科学院/農学院環境資源学専攻

グローバルCOEプログラム「統合フィールド環境科学の教育研究拠点形成」
北海道大学大学院環境科学院/農学院環境資源学専攻

"Global Quantitative Observation of Various Phytoplankton Groups from Space by Analysis of Hyper-Spectral Satellite Data"

研究院アワー2011年11月21日(月)


とき:2011年11月21日(月) 17:00〜18:00

場所: 大学院地球環境科学研究院講義棟D201室

演題:Global Quantitative Observation of Various Phytoplankton Groups from Space by Analysis of Hyper-Spectral Satellite Data

講演者:Astrid Bracher博士
(ドイツ・アルフレッド・ウェゲナー研究所(AWI)研究員 兼 ブレーメン大学客員教授)

座長:平田 貴文 特任助教(統合環境科学部門 実践・地球環境科学分野)

要旨:Quantitative distribution of major functional phytoplankton types (PFTs) of the world ocean improves the understanding of the role of marine phytoplankton in the global marine ecosystem and biogeochemical cycles. Because phytoplankton pigments absorb light for photosynthesis, satellite sensors detecting the ocean color can monitor phytoplankton on the global scale with reasonable spatial and temporal resolution. The analysis of hyper-spectral satellite data with PhytoDOAS, a method of Differential Optical Absorption Spectroscopy (DOAS) currently specialized for SCIAMACHY (Scanning Imaging Absorption Spectrometer for Atmospheric Cartography) on ENVISAT (details in Bracher et al. 2009, Sadegi et al. 2011), enables to extract the optical signature of marker pigments specific for certain PFTs. With including the calculation of the light penetration depth derived from the retrieval of inelastic scattering, the biomass (chl-a) of the PFTs is calculated and data from 2002-2011 have been processed. The lecture will give insight on the retrieval method and show the global maps of PFT distribution of four different dominant PFTs (diatoms, cyanobacteria, coccolithophores, dinoflagellates). In addition, results of evaluating the PHYTODOAS PFT products with in-situ data obtained from collocated pigment water samples analyzed via HPLC, with other satellite and model PFT products will be shown. The use of these global PFT satellite data sets for studying PFT bloom dynamics in specific oceanic regions or for evaluating an ecosystem model will be presented.

 

北海道大学グローバルCOEプログラム「統合フィールド環境科学の教育研究拠点形成」