2026-05-23T07:44:55Z https://api.figshare.com/v2/oai
oai:figshare.com:article/28846736 2025-04-23T12:12:26Z category_25732 portal_549 item_type_3 month_year_04_2025
10.5522/04/28846736.v2 https://figshare.com/articles/dataset/Free_tropospheric_nitrogen_dioxide_concentrations_from_cloud-slicing_TROPOMI/28846736 https://ndownloader.figshare.com/files/53919779 https://ndownloader.figshare.com/files/53919782 https://ndownloader.figshare.com/files/53919785 https://ndownloader.figshare.com/files/53919788 Horner, Rebekah Rebekah Horner Marais, Eloise Eloise Marais 0000-0001-5477-8051 <![CDATA[Free tropospheric nitrogen dioxide concentrations from cloud-slicing TROPOMI]]> Atmospheric composition, chemistry and processes TROPOMI cloud-slicing free troposphere NO2 2025-08-01 2025-08-01 Dataset 2025 University College London Seasonal multiyear mean nitrogen dioxide (NO2) mixing ratios in the free troposphere (300-700 hPa) obtained by applying cloud-slicing to total column densities of NO2 from the TROPOspheric Monitoring Instrument (TROPOMI).

Years averaged over are given in the filenames. Data are global coverage on a 1 degree horizontal grid.

The cloud-slicing technique is mostly consistent with the approach detailed in the open access, peer-reviewed Horner et al. (2024) paper, except that the target pressure range is 300-700 hPa to cover the full extent of the free troposphere and filtering to remove cloud-sliced NO2 data that fall statistically below zero is relaxed from (slope_error + slope) to (2*slope_error + slope), where the slope is the Theil-Sen regression slope obtained from regressing cloud top heights and total NO2 columns above optically thick clouds. These methodological adjustments are made for comparison to cloud-sliced NO2 obtained from the geostationary Tropospheric Emissions: Monitoring of Pollution (TEMPO) that has a limited viewing domain covering North America.

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