Dataset Open Access

Thermodynamic retrieved profiles from the ASSIST infrared spectrometer, FESSTVaL campaign

Turner, Dave; Rochette, Luc

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    <subfield code="a">Project: FESSTVaL (Field Experiment on submesoscale spatio-temporal variability in Lindenberg), a measurement campaign initiated by the Hans-Ertel-Center for Weather Research.</subfield>
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    <subfield code="a">&lt;p&gt;This dataset contains thermodynamic profiles retrieved from the ground-based infrared spectrometer called the ASSIST.&amp;nbsp; The ASSIST was located at the &amp;quot;MOLRAO&amp;quot; location at the DWD&amp;#39;s Lindenberg site.&amp;nbsp; The primary retrieved variables are T(z), q(z), liquid water path, and effective radius.&amp;nbsp; The uncertainties of these variables are provided, as well as a full error covariance matrix.&amp;nbsp; Most of the information from the ASSIST observation is in the lowest 2 km; the &amp;quot;cumulative degrees of freedom&amp;quot; fields (cdfs_temperature and cdfs_watervapor) provide a quantitative description of this information with height.&amp;nbsp; The data structure follows the standard DOE Atmospheric Radiation Measurement (ARM) program&amp;#39;s data format.&amp;nbsp; To get the time for the samples, add &amp;quot;base_time&amp;quot; to &amp;quot;time_offset&amp;quot; to get the number of seconds since 1 Jan 1970 at 00:00:00 UTC.&lt;/p&gt;

&lt;p&gt;&lt;strong&gt;Quality&lt;/strong&gt;: There are uncertainty profiles for all of the retrieved variables in the netCDF files.&amp;nbsp; However, the information content in the ASSIST observations decreases rapidly with height; profile quantifies above 3 km should be used with care.&amp;nbsp; Also, if the retrieved LWP &amp;gt; 10 g/m2, then there will be very little-to-no information on the temperature and humidity profile above the cloud base height.&amp;nbsp; I also recommend only using retrievals wherein the RMSr field is less than 8 and gamma field is less than 5. All of these variables are in the netCDF file.&lt;/p&gt;

&lt;p&gt;&lt;strong&gt;Parameters&lt;/strong&gt;: temperature, waterVapor, LWP, ReffL&lt;/p&gt;

&lt;p&gt;&lt;strong&gt;Funding&lt;/strong&gt;: LRtech provided the instrument to FESSTVaL free of charge.&amp;nbsp; The retrievals were performed under the auspices of the NOAA Atmospheric Science for Renewable Energy program&lt;/p&gt;</subfield>
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Publication date:
May 18, 2022
DOI:
10.25592/uhhfdm.10212

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Keyword(s):
Infrared spectrometer ASSIST thermodynamic profiles optimal estimation FESSTVaL SAMD measurement
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