We will go over making final figures but READ the Figure Making Guidelines PDF

# We will go over making final figures but read the

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the x-axis along with the linear fit of the trend line. We will go over making final figures but READ the Figure Making Guidelines PDF on Moodle! Finding the euphotic zone depth. 1. Once we have the Kd,PAR, we can compute the depth (z) of the euphotic zone (z eu ). This tells us for each station the actual depth to which photosynthesis can occur. Below this, there may still be some light detectable but this is the disphotic zone (some vision possible but no photosynthesis). We have discussed using 1% and 10%; these correspond to 1% of surface Ed,PAR and 10% of surface Ed,PAR, respectively. We will compute the 10% euphotic zone depth, for which we will use the abbreviation, z 10 . 2. The formula for computing z eu10 is: ζ = K d,PAR × z eu10 . ζ (zeta) is a constant value, for 10% it is -2.3. EXAMPLE: from the Kd,PAR determined above (-0.31) -2.3 = -0.31z 10 z 10 = -2.3/-0.31 = 7.4 m The -2.3 value comes from the following equation: ln ( ) ln (0) d d d E z K z E  If we want 10% of E d at the surface ( i.e. , E d (0)), then we need the natural log of 10% × the Ed(0) value, or 0.1×E d . The natural log of 10%,or 0.1., is -2.3. 3. Now, consider the euphotic zone depth 0f 7.4 m. This is a predicted value; we calculated it from first principles but also we used a Kd value, which is empirical. Note in Figure 4 that we only measured down to 6 m. This means that the photic zone easily reaches to the bottom of the water column for this station.

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• Fall '08
• Ptshaw

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