A multi-scale analysis of dynamic optical signals in a Southern California chaparral ecosystem: A comparison of field, AVIRIS and MODIS data (original) (raw)
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This study is dedicated to the understanding of time and space variability of bio-optical variables at a coastal station off Baja California Peninsula (ANTARES Baja California station, 31.75 o N/116.96 o W). The sampling procedure begun in May 2007 and in this presentation we will report changes observed in the absorption properties by three components of seawater (phytoplankton, detritus and chromophoric-dissolved-organic-matter or CDOM) in the photic zone in relation to changes in environmental conditions (inorganic nutrient) and phytoplankton community structure. Chlorophyll-a concentration (Chla) ranged from 0.04 to 1.44 mg m-3 with a strong vertical variability related to advective processes and the depth of the nutricline. Diatoms and dinoflagellates were the dominant fraction which was evaluated by HPLC pigment concentration (Fucoxanthin and Peridinin respectively). At low Chla phytoplankton community structure there are a higher proportion of small cells that were identified...
Bio-Optical Characteristics of the Northern Gulf of California during June 2008
International Journal of Oceanography, 2014
Bio-optical variables in the Northern Gulf of California were analyzed usingin situand satellite data obtained during a cruise in June 2008. The study area was divided into three bio-optical regions: Upper Gulf (UG), Northern Gulf (NG), and Great Isles (GI). Each region was characterized according to phytoplankton pigment concentration, phytoplankton and nonpigmented material spectral absorption coefficients, and spectral reflectance. Observed patterns were an indication of the shift in bio-optical conditions from north to south going from turbid and eutrophic waters to mesotrophic ones. Although there was a good agreement between satellite andin situChla(RMSE ±33%), an overestimation ofin situChlawas observed. This was partly explained by the presence of nonalgal particles, as well as the influence of desert and continental aerosols, which is generally overcorrected in the standard processing. The UG and NG could be considered as Case 2 waters, but they did exhibit different bio-o...