Gas phase and particle time series collected in Delhi Jan – Feb 2019

Sophie L. Haslett, David M. Bell, Varun Kumar, Jay G. Slowik, Dongyu S. Wang, Suneeti Mishra, Neeraj Rastogi, Atinderpal Singh, Dilip Ganguly, Joel Thornton, Feixue Zheng, Yuanyuan Li, Wei Nie, Yongchun Liu, Wei Ma, Chao Yan, Markku Kulmala, Kaspar R. Daellenbach, David Hadden, Urs Baltensperger, Andre S. H. Prevot, Sachchida N. Tripathi, Claudia Mohr

This dataset contains a time series N₂O₅ and ClNO₂ data collected using a chemical ionisation mass spectrometer (CIMS), organic aerosol, nitrate and chloride collected using an aerosol mass spectrometer (AMS) and other key related variables such as NOₓ and O₃.

These data are useful in understanding the relationship between NOₓ and the formation of chlorine-containing compounds.

Measurements were performed at the Centre for Atmospheric Sciences at the Indian Institute of Technology in New Delhi (28.54° N, 77.19° E) in January and February 2019.

Citation

Sophie L. Haslett, David M. Bell, Varun Kumar, Jay G. Slowik, Dongyu S. Wang, Suneeti Mishra, Neeraj Rastogi, Atinderpal Singh, Dilip Ganguly, Joel Thornton, Feixue Zheng, Yuanyuan Li, Wei Nie, Yongchun Liu, Wei Ma, Chao Yan, Markku Kulmala, Kaspar R. Daellenbach, David Hadden, Urs Baltensperger, Andre S. H. Prevot, Sachchida N. Tripathi, Claudia Mohr (2023) Gas phase and particle time series collected in Delhi Jan – Feb 2019. Dataset version 1. Bolin Centre Database. https://doi.org/10.17043/haslett-2023-delhi-1

References

Haslett, S. L., Bell, D. M., Kumar, V., Slowik, J. G., Wang, D. S., Mishra, S., Rastogi, N., Singh, A., Ganguly, D., Thornton, J., Zheng, F., Li, Y., Nie, W., Liu, Y., Ma, W., Yan, C., Kulmala, M., Daellenbach, K. R., Hadden, D., … Mohr, C. (2023). Nighttime NO emissions strongly suppress chlorine and nitrate radical formation during the winter in Delhi. Atmospheric Chemistry and Physics, 23(16), 9023–9036. https://doi.org/10.5194/acp-23-9023-2023

Data description

Data are provided in an Excel xlsx file containing 13 sheets, and associated csv files.

The sheets/csv files contain the following:

• timeSeries-AMS: particulate concentrations measured by the Aerosol Mass Spectrometer (AMS, Aerodyne Research): Organic aerosol (Org); Nitrate (NO₃); Chloride (Chl), in µg/m³.
• timeSeries-FIGAERO-CIMS: Gas phase concentrations measured by the Chemical Ionisation Mass Spectrometer with a Filter Inlet for Gases and Aerosols (FIGAERO-CIMS, Aerodyne Research), using iodide as the reagent ion: ClNO₂ and N₂O₅, in pptv. Both were observed as adducts with iodide; ClNO₂ at mass-to-charge ratio 208 and N₂O₅ at 235.
• timeSeries-NOx: NOₓ measured by a Serinus 40 Oxides of Nitrogen (NOₓ) analyser (ECOTECH): NO, NO₂ in ppbv.
• timeSeries-O₃: ozone measured by a Model 202 Ozone Monitor (2B Technologies) in ppbv.
• timeSeries-insolation: Insolation in W m⁻²

The remaining sheets/files contain average diel cycles over the campaign for the following compounds:

• diel-N2O5: N₂O₅ (pptv, FIGAERO-CIMS)
• diel-ClNO2: ClNO₂ (pptv, FIGAERO-CIMS)
• diel-NO: NO (ppbv; NOₓ analyser)
• diel-NO2: NO₂ (ppbv; NOₓ analyser)
• diel-O3: O₃ (ppbv; O₃ analyser)
• diel-Chl: Chloride (µg/m³; AMS) in the particle phase
• diel-CIMSGasPhase and diel-CIMSParticlePhase: CHON compounds as percentage of organic signal in the gas and particle phase (FIGAERO-CIMS): C₂ClH₃O₂ as percentage of organic signal in the gas phase (FIGAERO-CIMS); C₁₀H₁₅NO₆ as percentage of organic signal in the gas and particle phase (FIGAERO-CIMS); C₈H₁₁NO₇ as percentage of organic signal in the gas and particle phase (FIGAERO-CIMS).

In all cases, compounds measured with the FIGAERO-CIMS were observed as adducts with iodide.