English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

. Ground-based multi-axis differential optical absorption spectroscopy(MAX-DOAS) measurements of aerosols and tropospheric nitrogen dioxide( NO2 ) were carried out in Uccle (50.8 ∘  N, 4.35 ∘  E),Brussels, during 1 year from March 2018 until March 2019. The instrumentwas operated in both the UV and visible wavelength ranges in a dual-scanconfiguration consisting of two sub-modes: (1) an elevation scan in a fixedviewing azimuthal direction (the so-called main azimuthal direction)pointing to the northeast and (2) an azimuthal scan in a fixed low elevationangle (2 ∘ ). By applying a vertical profile inversion algorithm in themain azimuthal direction and a parameterization technique in the otherazimuthal directions, near-surface NO2 volume mixing ratios (VMRs) andvertical column densities (VCDs) were retrieved in 10 different azimuthaldirections. The dual-scan MAX-DOAS dataset allows for partly resolving thehorizontal distribution of NO2 around the measurement site and studyingits seasonal variations. Furthermore, we show that measuring thetropospheric NO2 VCDs in different azimuthal directions improves thespatial colocation with measurements from the Sentinel-5 Precursor (S5P),leading to a reduction of the spread in validation results. By using NO2 vertical profile information derived from the MAX-DOASmeasurements, we also resolve a systematic underestimation in S5P NO2 data due to the use of inadequate a priori NO2 profile shape data in the satellite retrieval.

atmospheric measurement techniques

Validation of TROPOMI tropospheric NO<sub>2</sub> columns using dual-scan multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements in Uccle, Brussels

Validation of TROPOMI tropospheric NO2 columns using dual-scan multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements in Uccle, Brussels

Validation of TROPOMI tropospheric NO₂ columns using dual-scan multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements in Uccle, Brussels