A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit <a rel="external noopener" href="http://publications.lib.chalmers.se/records/fulltext/250754/local_250754.pdf">the original URL</a>. The file type is <code>application/pdf</code>.
Disk and circumsolar radiances in the presence of ice clouds
<span title="2016-11-25">2016</span>
<i title="Copernicus GmbH">
<a target="_blank" rel="noopener" href="https://fatcat.wiki/container/x2ckl4ac3beqpklzlv72spkk2u" style="color: black;">Atmospheric Chemistry and Physics Discussions</a>
</i>
Preserved Fulltext
The impact of ice clouds on solar-disk and circumsolar radiances is investigated using a Monte Carlo radiative transfer model. The monochromatic direct and diffuse radiances are simulated at angles of 0° to 8° from the center of the Sun. Input data for the model are derived from measurements conducted during the 2010 Small Particles in Cirrus campaign together with state-of-the-art databases of optical properties of ice crystals and aerosols. For selected cases, the simulated radiances are
<span class="external-identifiers">
<a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.5194/acp-2016-967">doi:10.5194/acp-2016-967</a>
<a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/mcufbcg2lvcohgsa2v433y3eii">fatcat:mcufbcg2lvcohgsa2v433y3eii</a>
</span>
more »
... red with ground-based radiance measurements with the Sun and Aureole Measurement (SAM) instrument. <br><br> First, the sensitivity of the radiances to the ice cloud properties and aerosol optical thickness was addressed. The angular dependence of the disk and circumsolar radiances was found to be most sensitive to assumptions about ice crystal roughness (or, more generally, non-ideal features of ice crystals) and size distribution, with ice crystal habit playing a somewhat smaller role. Second, in the comparisons with SAM data, the ice-cloud optical thickness was adjusted for each case so that the simulated radiances agreed closely (i.e., within 3&thinsp;%) with the measured disk radiances. Circumsolar radiances at angles larger than &asymp;&thinsp;3° were systematically underestimated when assuming smooth ice crystals, but the agreement with the measurements was better when rough ice crystals were assumed. Our results suggest that it may well be possible to infer the particle roughness (or more generally, non-ideality) directly from ground-based SAM measurements. In addition, the results show the necessity of correcting the ground-based measurements of direct radiation for the presence of diffuse radiation in the instrument's field of view, in particular in the presence of ice clouds.
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20180720181425/http://publications.lib.chalmers.se/records/fulltext/250754/local_250754.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext">
<button class="ui simple right pointing dropdown compact black labeled icon button serp-button">
<i class="icon ia-icon"></i>
Web Archive
[PDF]
<div class="menu fulltext-thumbnail">
<img src="https://blobs.fatcat.wiki/thumbnail/pdf/77/ca/77ca919830d5791b8b466db1ea97708ed7cd2886.180px.jpg" alt="fulltext thumbnail" loading="lazy">
</div>
</button>
</a>
<a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.5194/acp-2016-967">
<button class="ui left aligned compact blue labeled icon button serp-button">
<i class="unlock alternate icon" style="background-color: #fb971f;"></i>
Publisher / doi.org
</button>
</a>