Preprints
https://doi.org/10.5194/acp-2022-743
https://doi.org/10.5194/acp-2022-743
 
05 Dec 2022
05 Dec 2022
Status: this preprint is currently under review for the journal ACP.

OMI UV aerosol index data analysis over the Arctic region for future data assimilation and climate forcing applications

Blake T. Sorenson1, Jianglong Zhang1, Jeffrey S. Reid2, Peng Xian2, and Shawn Jaker1 Blake T. Sorenson et al.
  • 1Department of Atmospheric Sciences, University of North Dakota, Grand Forks, North Dakota, 58202, United States of America
  • 2Marine Meteorology Division, Naval Research Laboratory, Monterey, California, 93943, United States of America

Abstract. Due to a lack of high latitude ground-based and satellite-based data from traditional passive- and active-based measurements, the impact of aerosol particles on the Arctic region is one of the least understood factors contributing to recent Arctic sea ice changes. In this study, we investigated the feasibility of using the UV Aerosol Index (AI) parameter from the Ozone Monitoring Instrument (OMI), a semi-quantitative aerosol parameter, for quantifying spatiotemporal changes in UV-absorbing aerosols over the Arctic region. We found that OMI AI data are affected by additional row anomaly that is unflagged by the OMI quality control flag and are systematically biased as functions of observing conditions, such as azimuth angle, and certain surface types over the Arctic region. Two methods were developed in this study for quality assuring the Arctic AI data. Using quality-controlled OMI AI data from 2005 through 2020, we found decreases in UV-absorbing aerosols in the spring months (April and May) over much of the Arctic region and increases in UV-absorbing aerosols in the summer months (June, July, and August) over northern Russia and northern Canada. Additionally, we found significant increases in the frequency and size of UV-absorbing aerosol events across the Arctic and high Arctic (north of 80° N) regions for the latter half of the study period (2014–2020), driven primarily by a significant increase in boreal biomass-burning plume coverage.

Blake T. Sorenson et al.

Status: open (until 16 Feb 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-743', Anonymous Referee #1, 09 Jan 2023 reply
  • RC2: 'Comment on acp-2022-743', Andrew Sayer, 24 Jan 2023 reply

Blake T. Sorenson et al.

Blake T. Sorenson et al.

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Short summary
We quality control OMI aerosol index data by identifying additional row anomaly and removing systematic biases, and further use the QA-ed data to quantify trends in UV absorbing aerosols over the Arctic region. We found decreasing trends in UV absorbing aerosols in spring months and increasing trends in summer months. For the first time, observational evidence of increasing trends in UV absorbing aerosols over the North Pole is found using the OMI data, especially over the last half decade.
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