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<p><font face="TeX Gyre Adventor">Colleagues</font></p>
<p><font face="TeX Gyre Adventor">I have a general question where I
suspect the answer is "no".<br>
</font></p>
<p>Problem:</p>
<p>I would like to calculate temperature gradients from satellite
measured SST in ocean areas around a land mass (see <a
class="moz-txt-link-rfc2396E" href="http://u.pc.cd/K62rtalK"
moz-do-not-send="true"><http://u.pc.cd/K62rtalK></a> for a
plot of the SST data). The SST data matrix has missing values.
Using the landsea_mask and mask functions, I have confirmed that
the missing data (data@_FillValue) are at grid points over land.
If I remove the missing values, I destroy the regular grid.</p>
<p>Question: Does NCL have a function for calculating gradients in
ocean areas with land? Or are the various functions designed to
calculate gradients in the atmosphere?</p>
<p>Best fishes</p>
<p>Sam<br>
</p>
<div class="moz-signature">-- <br>
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<title>email signature</title>
Sam McClatchie (fisheries oceanographer)<br>
& Elena Turin (accounting & auditing)<br>
FishOcean Enterprises <span style="text-decoration: underline;"><a
href="http://www.fishocean.info" moz-do-not-send="true">www.fishocean.info</a></span><br>
38 Upland Rd, Huia, Auckland 0604, New Zealand<br>
cell: 027 752 8495<br>
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<br>
“The three great elemental sounds in nature are the sound of rain,<br>
the sound of wind in a primeval wood, and the sound of outer ocean
on a beach.<br>
I have heard them all, and of the three elemental voices, <br>
that of ocean is the most awesome, beautiful and varied.”<br>
<br>
― Henry Beston, The Outermost House: A Year of Life on the Great
Beach of Cape Cod </div>
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