Quantitative observation of cyanobacteria and diatoms from space using PhytoDOAS on SCIAMACHY data
Quantitative observation of cyanobacteria and diatoms from space using PhytoDOAS on SCIAMACHY data
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DOI：
10.5194/bg-6-751-2009
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发表时间：
2009-01-01
期刊：
影响因子：
4.9
通讯作者：
Peeken, I.
中科院分区：
文献类型：
--
作者：
Bracher, A.;Vountas, M.;Peeken, I.
在这项研究中，差分光学吸收光谱（DOAS）的技术已被改编为两个主要的浮游植物群体（PhytoDOAS）的大气制图扫描成像吸收光谱仪（SCIAMACHY）卫星传感器的数据的吸收和生物量的检索。SCIAMACHY测量紫外-可见-近红外光谱区的后向散射太阳辐射，具有高光谱分辨率（0.2至1.5 nm）。为了确定SCIAMACHY数据中430至500 nm范围内的浮游植物吸收特性，使用了在两次不同的RV“Polarstern”考察期间现场测量的浮游植物吸收光谱。这两个光谱已被测量在不同的海洋区域，不同的浮游植物群体（蓝藻和硅藻）占主导地位的浮游植物组成。结果清楚地表明，在SCIAMACHY光谱的两个浮游植物群体的不同吸收特性。使用这些结果以及从非弹性散射的DOAS检索得到的光穿透深度的计算（由Vountas等人开发，2007年），全球分布的色素浓度为这些特征的浮游植物群体的两个月期间（2004年2月至3月和2005年11月至11月）进行了测定。关于蓝细菌和硅藻分布的该卫星信息清楚地匹配基于并置水样品的高压液相色谱（HPLC）色素分析的浓度和从具有NASA海洋生物地球化学模型的全球模型分析得出的浓度（Gregg等人，2003; Gregg and凯西2007）.从空间对主要浮游植物群体的分布进行定量评估，可以区分不同的海洋地球化学区域，这对于海洋生态系统和海洋地球化学循环的全球建模具有重要意义，从而可以估计气候变化对海洋生物圈的影响。
In this study the technique of Differential Optical Absorption Spectroscopy (DOAS) has been adapted for the retrieval of the absorption and biomass of two major phytoplankton groups (PhytoDOAS) from data of the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) satellite sensor. SCIAMACHY measures back scattered solar radiation in the UV-Vis-NIR spectral regions with a high spectral resolution (0.2 to 1.5 nm). In order to identify phytoplankton absorption characteristics in the SCIAMACHY data in the range of 430 to 500 nm, phytoplankton absorption spectra measured in-situ during two different RV "Polarstern" expeditions were used. The two spectra have been measured in different ocean regions where different phytoplankton groups (cyanobacteria and diatoms) dominated the phytoplankton composition. Results clearly show distinct absorption characteristics of the two phytoplankton groups in the SCIAMACHY spectra. Using these results in addition to calculations of the light penetration depth derived from DOAS retrievals of the inelastic scattering (developed by Vountas et al., 2007), globally distributed pigment concentrations for these characteristic phytoplankton groups for two monthly periods (February-March 2004 and October-November 2005) were determined. This satellite information on cyanobacteria and diatoms distribution clearly matches the concentrations based on high pressure liquid chromatography (HPLC) pigment analysis of collocated water samples and concentrations derived from a global model analysis with the NASA Ocean Biogeochemical Model (Gregg et al., 2003; Gregg and Casey 2007). The quantitative assessment of the distribution of key phytoplankton groups from space enables various biogeochemical regions to be distinguished and will be of great importance for the global modeling of marine ecosystems and biogeochemical cycles which enables the impact of climate change in the oceanic biosphere to be estimated.