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• W4301394948 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Dry deposition of ammonia (NH<span class=inline-formula>₃)</span> is the largest contributor to the nitrogen deposition from the atmosphere to soil and vegetation in the Netherlands, causing eutrophication and loss of biodiversity; however, data sets of NH<span class=inline-formula>₃</span> fluxes are sparse and in general have monthly resolution at best. An important reason for this is that measurement of the NH<span class=inline-formula>₃</span> flux under dry conditions is notoriously difficult. There is no technique that can be considered as the gold standard for these measurements, which complicates the testing of new techniques. Here, we present the results of an intercomparison of two novel measurement set-ups aimed at measuring dry deposition of NH<span class=inline-formula>₃</span> at half hourly resolution. Over a 5-week period, we operated two novel optical open-path techniques side by side at the Ruisdael station in Cabauw, the Netherlands: the RIVM-miniDOAS 2.2D using the aerodynamic gradient technique, and the commercial Healthy Photon HT8700E using the eddy covariance technique. These instruments are widely different in their measurement principle and approach to derive deposition values from measured concentrations; however, both techniques showed very similar results (<span class=inline-formula><i>r</i>=0.87</span>) and small differences in cumulative fluxes (<span class=inline-formula>∼</span> 10 %) as long as the upwind terrain was homogeneous and free of nearby obstacles. The observed fluxes varied from <span class=inline-formula>∼</span> <span class=inline-formula>−80</span> to <span class=inline-formula>∼</span> <span class=inline-formula>+</span>140 ng NH<span class=inline-formula>₃</span> m<span class=inline-formula>^−2</span> s<span class=inline-formula>^−1</span>. Both the absolute flux values and the temporal patterns were highly similar, which substantiates that both instruments were able to measure NH<span class=inline-formula>₃</span> fluxes at high temporal resolution. However, for wind directions with obstacles nearby, the correlations between the two techniques were weaker. The uptime of the miniDOAS system reached 100 % once operational, but regular intercalibration of the system was applied in this campaign (35 % of the 7-week uptime). Conversely, the HT8700E did not measure during and shortly after rain, and the coating of its mirrors tended to degrade (21 % data loss during the 5-week uptime). In addition, the NH<span class=inline-formula>₃</span> concentrations measured by the HT8700E proved sensitive to air temperature, causing substantial differences (range: <span class=inline-formula>−15</span> to <span class=inline-formula>+6</span> <span class=inline-formula>µ</span>g m<span class=inline-formula>^−3)</span> between the two systems. To conclude, the miniDOAS system appears ready for long-term hands-off monitoring. The current HT8700E system, on the other hand, had a limited stand-alone operational time under the prevailing weather conditions. However, under relatively dry and low-dust conditions, the system can provide sound results, opening good prospects for future versions, also for monitoring applications. The new high temporal resolution data from these instruments can facilitate the study of processes behind NH<span class=inline-formula>₃</span> dry deposition, allowing an improved understanding of these processes and better parameterisation in chemical transport models." @default.
• W4301394948 created "2022-10-05" @default.
• W4301394948 creator A5033846615 @default.
• W4301394948 date "2022-10-04" @default.
• W4301394948 modified "2023-10-01" @default.
• W4301394948 title "Reply on RC1" @default.
• W4301394948 doi "https://doi.org/10.5194/amt-2022-171-ac1" @default.
• W4301394948 hasPublicationYear "2022" @default.
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