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<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">Dear Semantics WG,</span><span lang="EN-US" style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">ESO measures the atmospheric conditions at the various sites (Paranal, La Silla, Chajnantor, and later Armazones).</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">Here, a minimal list of the most important quantities measured:</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;background:white">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:EN-GB"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">Absolute humidity</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;background:white">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:EN-GB"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">Relative humidity</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;background:white">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:EN-GB"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">Turbulence intensity (in units of m**(1/3))</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;background:white">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:EN-GB"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">Temperature</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;background:white">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:EN-GB"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">Dew temperature</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;background:white">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:EN-GB"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">Precipitable water vapour</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;background:white">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:EN-GB"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">Wind direction</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;background:white">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:EN-GB"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">Wind speed component U, V, W</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;background:white">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:EN-GB"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">Rain (percentage)</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;background:white">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:EN-GB"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:black;mso-fareast-language:EN-GB">Coherence time
</span><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">of the turbulence (Tau0)</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;background:white">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:EN-GB"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">Isoplanatic angle (Theta0)</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;background:white">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:EN-GB"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">Characteristic velocity of the turbulence</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;background:white">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:EN-GB"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">S</span><span style="color:black;mso-fareast-language:EN-GB">mall (0.5 micron) dust
</span><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">p</span><span style="color:black;mso-fareast-language:EN-GB">article count per cube meter</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;background:white">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:EN-GB"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">etc.</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">Some of those quantities are measured at different altitudes around the domes (e.g. from -20m to +30m from the level of the VLT platform);</span><span lang="EN-US" style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">some others are measured at very different levels (from 0.5km to 16 km) to build the atmospheric vertical profiles of e.g., humidity, temperature,
turbulence, etc..</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">All those measurements are offered via the ESO TAP (tap_obs).</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">The problem is that there are no UCDs I could use to describe those columns</span><span lang="EN-US" style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">(apart from the obvious phys.temperature, but then what to use for the dew temeperature?).<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">Would it be possible to introduce some new UCDs to cover those concepts?</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">I can provide the definitions for the listed quantities, if that helps defining those UCDs.</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">I also hope that other ground-based observatories have the same need, anybody out there?</span><span lang="EN-US" style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Many thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Alberto<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">--<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Alberto Micol<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Science Archive Group<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">European Southern Observatory<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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