MARS2014 Lecture Notes - Lecture 16: Sea Surface Temperature, Secchi Disk, Coral Bleaching
Monday, 26 March 2018
MARS2014- Week 6 Lecture 1
Marine Remote Sensing Pt.2 Oceans
-Field data 0.5% area coverage 95% accuracy
-Remote sensing data 100% area coverage with 70% accuracy
-Imagery:
•Multi-spectral = <10 bands
•Hyper-spectral = >10 bands
-Need to look at spatial sales (area covered), spectral scales (light sensitive
bands), and temporal scales (frequency and resist time) to determine what type of
sensing is necessary
-SST: sea surface temperature
-MODIS: Daily-Global SST
-MODIS not always complete due to swath width, clouds, and land, however the longer
the period the imagery is happening the more accurate and complete the image will
get
-Understanding SST is important in understanding the impacts on coral reefs (e.g.
coral bleaching)
-The ocean colour in images allow for interpretation and estimates of the biophysical
properties as they influence the light going through the water column
-Case 1 waters blue/ocean- phytoplankton and products derived from it
-Case 2 green/costal waters- mainly due to organic and inorganic suspended matter
-High levels of chlorophyll = high levels of phytoplankton = bigger species that
consume them (e.g. influx of manta rays)
-Secchi depth- plate lowered into the water column until the point where it cannot be
seen anymore
-PAR: Photosynthetic Active Radiation
-PAR is crucial for all living organisms
-SSH: sea surface height
-Different wavelength of light will penetrate water at different depth
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find more resources at oneclass.com
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Document Summary
Field data 0. 5% area coverage 95% accuracy. Remote sensing data 100% area coverage with 70% accuracy. Imagery: multi-spectral = <10 bands, hyper-spectral = >10 bands. Need to look at spatial sales (area covered), spectral scales (light sensitive bands), and temporal scales (frequency and resist time) to determine what type of sensing is necessary. Modis not always complete due to swath width, clouds, and land, however the longer the period the imagery is happening the more accurate and complete the image will get. Understanding sst is important in understanding the impacts on coral reefs (e. g. coral bleaching) The ocean colour in images allow for interpretation and estimates of the biophysical properties as they in uence the light going through the water column. Case 1 waters blue/ocean- phytoplankton and products derived from it. Case 2 green/costal waters- mainly due to organic and inorganic suspended matter.
