Dr. Allison McComiskey Profile

Dr. Allison McComiskey

at National Oceanic and Atmospheric Administration

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Proceedings Article | 9 October 2018 Paper

Climatology of aerosol optical depth at mid-continental US site: ground-based observations

Evgueni Kassianov, Justin Monroe, Laura Riihimaki, Connor Flynn, Erol Cromwell, Gary Hodges, Allison McComiskey

Proceedings Volume 10786, 107860H (2018) https://doi.org/10.1117/12.2326690

KEYWORDS: Aerosols, Climatology, Clouds, Radiometry, Atmospheric optics, Atmospheric particles, Calibration, Inspection, Passive remote sensing

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The total aerosol burden in the atmosphere is typically represented by aerosol optical depth (AOD). To capture important and climate-relevant signatures of the aerosol burden, such as year-to-year and seasonal variability, continuous multi-year AOD observations are required. For more than two decades, these observations have been performed at the mid-continental Atmospheric Radiation Measurement (ARM) Southern Great Plains (SGP) Central Facility (CF) using ground-based passive remote sensing. The partially overlapping and fragmentary AOD records at the ARM SGP CF have been provided by four individual instruments, namely two co-located (C1 and E13) Multifilter Rotating Shadowband Radiometers (MFRSRs), a Normal Incidence Multifilter Radiometer (NIMFR), and a Cimel Sunphotometer (CSPHOT). Since these individual records are sporadic with instrument- and time-dependent data quality, development of a continuous multi-year high-quality AOD dataset is a challenging task. In this work, an initial development of a continuous 20-year (1997-2017) high-quality AOD product is introduced. The development involves (1) incorporation of the available data quality information and delivery of the historical time series of AOD with high quality from four individual instruments, (2) comparison of multiple AOD retrievals to identify potential instrument-related issues and/or retrieval problems, and (3) merging these individual time series, generation of a two-decade continuous climatology of high-quality AOD and reporting of the uncertainty estimations of the merged product.

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