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    <p>Lars,</p>
    <p>In truth, we haven't even attempted to find or request standard
      names for these. We used units of "days" for the counts of days.
      The freeze date variables used units of "days since 1900-01-01
      00:00:00". Things are stable enough now that we need to get back
      to addressing the standard name questions.</p>
    <p>Jim<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 3/22/17 11:24 AM, Bärring Lars
      wrote:<br>
    </div>
    <blockquote
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        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB">Dear Jim, all,<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB">This list is very interesting and helpful. I
            think that most of them if not all are similar, in structure
            at least, to the ones we are working on. To what extent you
            already managed to find a CF description to describe the
            them?
            <o:p></o:p></span></p>
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style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
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        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB">I am asking because the ones that we are
            working on right now are similar to your [Modified] Growing
            Degree Days and  First/Last Freeze Date, as well as the Pth
            Percentile X. The other ones I like to think that we have
            covered, even though the actual proof of having test files
            that pass the checker remains.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
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        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB">Thanks & Kind regards,<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB">Lars<o:p></o:p></span></p>
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            1.0pt;padding:3.0pt 0cm 0cm 0cm">
            <p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"
                  lang="EN-US">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"
                lang="EN-US"> CF-metadata
                [<a class="moz-txt-link-freetext" href="mailto:cf-metadata-bounces@cgd.ucar.edu">mailto:cf-metadata-bounces@cgd.ucar.edu</a>]
                <b>On Behalf Of </b>Jim Biard<br>
                <b>Sent:</b> den 22 mars 2017 14:47<br>
                <b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:cf-metadata@cgd.ucar.edu">cf-metadata@cgd.ucar.edu</a><br>
                <b>Subject:</b> Re: [CF-metadata] Recording "day of year
                on which something happens"<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p>Hi.<o:p></o:p></p>
        <p>Here are descriptions of a few different products I am
          working on right now. This may help broaden the discussion a
          bit.<o:p></o:p></p>
        <ul type="disc">
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
            level1 lfo1">
            Consecutive Dry Days - the maximum span of days over a given
            interval (a year in my case) where less than 0.01 inches of
            precipitation fell.<o:p></o:p></li>
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
            level1 lfo1">
            Consecutive Wet Days - the inverse of consecutive dry days.
            The maximum span of days where at least 0.01 inches of
            precipitation fell.<o:p></o:p></li>
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
            level1 lfo1">
            Cooling Degree Days - the sum over an interval (a year in my
            case) of the positive differences between daily average
            temperature in deg F and 65 deg F.<o:p></o:p></li>
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
            level1 lfo1">
            Heating Degree Days - the inverse of cooling degree days.<o:p></o:p></li>
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
            level1 lfo1">
            Growing Degree Days - the sum over an interval (a year in my
            case) of the positive differences between daily average
            temperature in deg F and 50 deg F.<o:p></o:p></li>
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
            level1 lfo1">
            Modified Growing Degree Days - the sum over an interval (a
            year in my case) of the positive differences between
            modified daily average temperature (average of Tmin and Tmax
            where Tmin values below 50 deg F are set to 50 deg F and
            Tmax values above 86 deg F are set to 86 deg F) in deg F and
            50 deg F.<o:p></o:p></li>
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
            level1 lfo1">
            First Freeze Date - The date of the first day in the
            interval from Aug 1 of the year to April 30 of the next year
            when the daily minimum temperature was 0 deg C or less.<o:p></o:p></li>
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
            level1 lfo1">
            Last Freeze Date - The date of the last day in the interval
            from Nov 1 of the previous year to July 31 of the year when
            the daily minimum temperature was 0 deg C or less.<o:p></o:p></li>
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
            level1 lfo1">
            Growing Season Length - The number of days between the first
            and last freeze dates for the year.<o:p></o:p></li>
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
            level1 lfo1">
            1st Percentile X - The first percentile value of X (done for
            Tmax, Tmin, and precip) over a 30-year interval.<o:p></o:p></li>
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
            level1 lfo1">
            99th Percentile X - The 99th percentile value of X (done for
            Tmax, Tmin, and precip) over a 30-year interval.<o:p></o:p></li>
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
            level1 lfo1">
            Days of X Above Threshold Y - The number of days in an
            interval (a year in my case) where the value X (Tmax, Tmin,
            precip) was greater than a threshold value Y.<o:p></o:p></li>
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
            level1 lfo1">
            Days of X Below Threshold Y - The number of days in an
            interval (a year in my case) where the value X (Tmax, Tmin,
            precip) was less than a threshold value Y.<o:p></o:p></li>
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
            level1 lfo1">
            Precip Sum Above Threshold Y - The sum over an interval (a
            year in my case) of the quantity of daily precip above
            threshold Y.<o:p></o:p></li>
        </ul>
        <p>The growing degree days and days of X above/below threshold
          are all cases of one of<o:p></o:p></p>
        <ul type="disc">
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2
            level1 lfo2">
            Days of X Above Threshold Y<o:p></o:p></li>
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2
            level1 lfo2">
            Days of X Below Threshold Y<o:p></o:p></li>
        </ul>
        <p>The cooling degree and heating degree days, and precip sum
          above threshold Y are all cases of one of<o:p></o:p></p>
        <ul type="disc">
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0
            level1 lfo3">
            X Sum Above Threshold Y<o:p></o:p></li>
          <li class="MsoNormal"
            style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0
            level1 lfo3">
            X Sum Below Threshold Y (The negative differences are all
            inverted to become positive differences.)<o:p></o:p></li>
        </ul>
        <p class="MsoNormal" style="margin-bottom:12.0pt">Grace and
          peace,<br>
          <br>
          Jim<o:p></o:p></p>
        <div>
          <p class="MsoNormal">On 3/22/17 5:33 AM, Jon Blower wrote:<o:p></o:p></p>
        </div>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <pre>Dear all,<o:p></o:p></pre>
          <pre><o:p> </o:p></pre>
          <pre>Thanks again for the helpful replies to my last summary email. I’ll pick up on the points here:<o:p></o:p></pre>
          <pre><o:p> </o:p></pre>
          <pre> 1. I realise that my use of the word “threshold” may have been confusing in this context. I was following the precedent set by previous standard names. The variable would record the day of the year (or growing season) on which the “threshold” number of degree days is attained. The possible values of this threshold are stored in a coordinate variable. This is very different from the “threshold” temperature that is used in the calculation of the “growing degree day” parameter itself.<o:p></o:p></pre>
          <pre><o:p> </o:p></pre>
          <pre> 2. I’m not at all an expert here, but my understanding is that there are various possible ways to calculate GDDs. Lars has helpfully pointed out that ET-SCI and ETCCDI definitions exist, and I’ll pass these on to the project team – maybe that’s what the team are using. But anyway, I’m not totally sure that “integral_of_air_temperature_excess_wrt_time” is strictly accurate in all cases, since it’s not always simply a question of integrating some “delta-T” over time. The Wikipedia article points out some ways in which GDD is not a strict integral (e.g. in some cases it is considered that there is a maximum number of GDDs that can be meaningfully attained in a day).<o:p></o:p></pre>
          <pre><o:p> </o:p></pre>
          <pre> 3. David correctly pointed out the “Northern Hemisphere chauvinism” in my proposal. Our project is focused on Europe, but it is quite correct to consider how the same approach might apply to the southern hemisphere growing season. <o:p></o:p></pre>
          <pre><o:p> </o:p></pre>
          <pre> 4. I’m still not convinced about using “sum” in cell_methods. This might be appropriate if the variable in question were GDD, but the variable is actually a _time_ at which we reach a certain number of GDD. We are not summing time, so I’m not sure that using “sum” is right. Happy to be corrected on this though, maybe I’ve misunderstood the intention.<o:p></o:p></pre>
          <pre><o:p> </o:p></pre>
          <pre>I think I need to discuss these issues within the project to work out exactly what we’re actually going to be recording – I’ll do this and report back our thoughts. <o:p></o:p></pre>
          <pre><o:p> </o:p></pre>
          <pre>Many thanks again,<o:p></o:p></pre>
          <pre>Jon<o:p></o:p></pre>
          <pre><o:p> </o:p></pre>
          <pre>_______________________________________________<o:p></o:p></pre>
          <pre>CF-metadata mailing list<o:p></o:p></pre>
          <pre><a moz-do-not-send="true" href="mailto:CF-metadata@cgd.ucar.edu">CF-metadata@cgd.ucar.edu</a><o:p></o:p></pre>
          <pre><a moz-do-not-send="true" href="http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata">http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata</a><o:p></o:p></pre>
        </blockquote>
        <p class="MsoNormal"><o:p> </o:p></p>
        <div>
          <p class="MsoNormal">-- <o:p></o:p></p>
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style="font-size:10.5pt;font-family:"Times","serif";color:#333333"><o:p></o:p></span></p>
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                      <td style="padding:1.5pt 1.5pt 1.5pt
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                        <p class="MsoNormal" style="line-height:9.0pt"><b><span
style="font-size:8.5pt;font-family:"Arial","sans-serif";color:#333333">Jim
                              Biard</span></b><span
style="font-size:8.5pt;font-family:"Arial","sans-serif";color:#333333"><br>
                            <b>Research Scholar</b> <br>
                            <a moz-do-not-send="true"
                              href="http://cicsnc.org/"><b><span
                                  style="color:#263A8F;text-decoration:none">Cooperative
                                  Institute for Climate and Satellites
                                  NC
                                </span></b></a><br>
                            <a moz-do-not-send="true"
                              href="http://ncsu.edu/"><b><span
                                  style="color:#263A8F;text-decoration:none">North
                                  Carolina State University
                                </span></b></a><br>
                            <a moz-do-not-send="true"
                              href="http://ncdc.noaa.gov/"><b><span
                                  style="color:#263A8F;text-decoration:none">NOAA
                                  National Centers for Environmental
                                  Information
                                </span></b></a><br>
                            <i>formerly NOAA’s National Climatic Data
                              Center</i> <br>
                            151 Patton Ave, Asheville, NC 28801 <br>
                            e: <a moz-do-not-send="true"
                              href="mailto:jbiard@cicsnc.org"><span
                                style="color:#263A8F">jbiard@cicsnc.org</span></a>
                            <br>
                            o: +1 828 271 4900 <br>
                            <br>
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style="font-size:10.5pt;font-family:"Times","serif";color:#333333"><o:p></o:p></span></p>
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                <p class="MsoNormal"><span
style="font-size:13.5pt;font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
              </div>
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    </blockquote>
    <br>
    <div class="moz-signature">-- <br>
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                        <span style="font-size: 11px; "><span
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                            <b>Jim Biard</b>
                            <br>
                            <b>Research Scholar</b>
                            <br>
                            <a href="http://cicsnc.org/" style="color:
                              rgb(38, 58, 143); text-decoration: none;
                              font-weight: bold; ">
                              Cooperative Institute for Climate and
                              Satellites NC
                            </a>
                            <br>
                            <a href="http://ncsu.edu/" style="color:
                              rgb(38, 58, 143); text-decoration: none;
                              font-weight: bold; ">
                              North Carolina State University
                            </a>
                            <br>
                            <a href="http://ncdc.noaa.gov/"
                              style="color: rgb(38, 58, 143);
                              text-decoration: none; font-weight: bold;
                              ">
                              NOAA National Centers for Environmental
                              Information
                            </a>
                            <br>
                            <i>formerly NOAA’s National Climatic Data
                              Center</i>
                            <br>
                            151 Patton Ave, Asheville, NC 28801
                            <br>
                            e: <a href="mailto:jbiard@cicsnc.org"
                              style="color: rgb(38, 58, 143); ">jbiard@cicsnc.org</a>
                            <br>
                            o: +1 828 271 4900
                            <br>
                            <br>
                            <i style="color:Gray">Connect with us on
                              Facebook for <a
                                href="https://www.facebook.com/NOAANCEIclimate"
                                style="color: rgb(38, 58, 143);">climate</a>
                              and
                              <a
                                href="https://www.facebook.com/NOAANCEIoceangeo"
                                style="color: rgb(38, 58, 143); ">ocean
                                and geophysics</a>
                              information, and follow us on Twitter at
                              <a
                                href="https://twitter.com/NOAANCEIclimate"
                                style="color: rgb(38, 58, 143); ">@NOAANCEIclimate</a>
                              and
                              <a
                                href="https://twitter.com/NOAANCEIocngeo"
                                style="color: rgb(38, 58, 143); ">@NOAANCEIocngeo</a>.
                            </i>
                          </span>
                        </span>
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