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<span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);"><b>From:
</b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;">Simon Bittner <simon.bittner@uni-bremen.de><br>
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<span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);"><b>Subject:
</b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;"><b>IM4CA Forecast Product — Preview & Feedback Request</b><br>
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<span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);"><b>Date:
</b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;">19 May 2026 at 14:17:46 CEST<br>
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<span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);"><b>To:
</b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;">Konstantin Gerilowski <gerilows@iup.physik.uni-bremen.de>, "Sander HOUWELING (SRON)" <s.houweling@sron.nl>, "Röckmann, T. (Thomas)" <t.rockmann@uu.nl>, Jean-daniel
Paris <jean-daniel.paris@lsce.ipsl.fr>, "Velandia Salinas, N. (Nataly)" <n.velandiasalinas@uu.nl>, Iancu Stefan <iancu.stefan@incas.ro>, Ardelean Magdalena <ardelean.magdalena@incas.ro>, "Geissbühler, D.C. (Dylan)" <d.c.geissbuhler@uu.nl><br>
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<span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);"><b>Cc:
</b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;">Mihalis Vrekoussis <mvrekous@uni-bremen.de>, Alex Poulidis <alepou@uni-bremen.de>, Yuna Katsuyama | Universitaet Bremen <yuna@uni-bremen.de><br>
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Sommige mensen die dit bericht hebben ontvangen, ontvangen niet vaak e-mail van simon.bittner@uni-bremen.de.
<a href="https://aka.ms/LearnAboutSenderIdentification" style="background: revert !important;color: revert !important;content-visibility: revert !important;direction: revert !important;display: revert !important;font-size: revert !important;opacity: revert !important;rotate: revert !important;scale: revert !important;visibility: revert !important;">
Ontdek waarom dit belangrijk is</a> </div>
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<span style="color:#9C6500">CAUTION:</span> This email originated from outside of Utrecht University. Do not click links or open attachments unless you recognize the sender and know the content is safe.</div>
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<div dir="auto">Hi everyone,<br>
<br>
I didn’t have a mailing list on hand. Feel free to forward it to everyone involved. We have been testing our forecast product and are still ironing out a few final details, but we wanted to share it now so you can assess what additional information might help
improve on-site decision-making during the campaign.<br>
<br>
Here is a brief overview of what we currently provide:</div>
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<li>We use ICON-EU data to drive WRF, dynamically downscaling the meteorological fields to 1.3 × 1.3 km grid spacing. These fields then drive FLEXPART-WRF, which simulates CH4 plume dispersion on a 700 × 700 m grid. No CH₄ background is included.</li><li>The CH4 plume simulation does not include complex chemistry — only wet deposition is considered.</li><li>As source locations and emission strengths are not well constrained, we use virtual sources in the forecast. All sources are assumed to emit 1 kt/year, with potential locations derived from flight boxes, cluster centres, and E-PRTR (2024). The absolute
values are therefore not representative, but plume locations, diffusion patterns, and potential build-up should be well captured for the virtual sources. Additional sources can be added easily if needed.</li></ol>
<div dir="auto">Output is available via two channels: (Research drive: <a href="https://vu.data.surf.nl/f/249145670" originalsrc="https://vu.data.surf.nl/f/249145670" target="_blank">https://vu.data.surf.nl/f/249145670</a> (only works with access), Website: <a href="https://aether.uni-bremen.de/forecast/" originalsrc="https://aether.uni-bremen.de/forecast/" target="_blank">https://aether.uni-bremen.de/forecast/</a>)
and consists of KMZ files (usable in Google Earth Pro) and a PDF file. KMZ files contain CH₄ mixing ratios at different altitudes, CH₄ vertical column density, and total cloud cover, while the PDF overview shows average conditions over 3h/6h time windows.<br>
We plan to upload new files each evening around 18:00 (EEST) for the following days. If you would like to receive a notification when files are uploaded, we can add everyone to a mailing list for the duration of the campaign. Our website will get more resources
soon, so for now, be patient when downloading from there :D<br>
<br>
Please have a look at the KMZ files and PDF, and let us know what plots or zoom regions would be most useful for day-to-day decision-making. If possible, I would like to collect suggestions and feedback during the meeting next week.<br>
<br>
Thanks a lot. We look forward to your feedback!</div>
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<div class="matchFont">Best
<div dir="auto">Simon & Alex</div>
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