Improved catalog of NOx point source emissions (version 2)

<p>We present an updated (v2) catalog of NO_x emissions from point sources&#160;<br>as derived from TROPOMI measurements of NO₂ (PAL product) combined with wind fields from ERA5.<br>Several improvements have been introduced to the algorithm.&#160;<br>Most importantly, several corrections are applied,&#160;<br>accounting for the effects of plume height on satellite sensitivity, 3D topographic effects,&#160;<br>and the chemical loss of NO_x,&#160;<br>resulting in considerably higher and more accurate NO_x emissions.&#160;<br>In addition, error estimates are provided for each point source.<br>&#160; &#160; &#160; &#160;&#160;<br>The catalog v2 is based on a fully automated iterative detection algorithm of point sources worldwide.<br>It lists 1139 locations that have been found to be significant NO_x sources.<br>The majority of these locations match to power plants listed in the global power plant database.<br>Other NO_x point sources correspond to cement plants, metal smelters, industrial areas, or medium-sized cities.<br>&#160; &#160; &#160; &#160;&#160;<br>The emissions listed in v2 of the catalog show good agreement (within 20% on average)&#160;<br>to emissions reported by German Environment Agency (Umweltbundesamt, UBA)&#160;<br>as well as the United States Environmental Protection Agency (EPA).&#160;</p>