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Effect of Wind Speed on Moderate Resolution Imaging Spectroradiometer (MODIS) Aerosol Optical Depth over the North Pacific
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.ORCID iD: 0000-0001-8293-367X
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
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Number of Authors: 52018 (English)In: Atmosphere, E-ISSN 2073-4433, Vol. 9, no 2, article id 60Article in journal (Refereed) Published
Abstract [en]

The surface-wind speed influences on aerosol optical depth (AOD), derived from the Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua daily observations over the central North Pacific during the period 2003-2016, have been investigated in this study. The cloud coverage is relatively low over the present investigation area compared to other marine areas, which favors AOD derived from passive remote sensing from space. In this study, we have combined MODIS AOD with 2 m wind speed (U-2m) on a satellite-pixel basis, which has been interpolated from National Centers for Environmental Prediction (NCEP) reanalysis. In addition, daily averaged AOD derived from Aerosol Robotic Network (AERONET) measurements in the free-troposphere at the Mauna Loa Observatory (3397 m above sea level), Hawaii, was subtracted from the MODIS column AOD values. The latter was to reduce the contribution of aerosols above the planetary boundary layer. This study shows relatively strong power-law relationships between MODIS mean AOD and surface-wind speed for marine background conditions in summer, fall and winter of the current period. However, previous established relationships between AOD and surface-wind speed deviate substantially. Even so, for similar marine conditions the present relationship agrees reasonable well with a power-law relationship derived for north-east Atlantic conditions. The present MODIS retrievals of AOD in the marine atmosphere agree reasonably well with ground-based remote sensing of AOD.

Place, publisher, year, edition, pages
2018. Vol. 9, no 2, article id 60
Keywords [en]
AOD, surface-wind speed, satellite retrievals, sea salt, ammonium sulfate, white caps
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-156015DOI: 10.3390/atmos9020060ISI: 000427507000026OAI: oai:DiVA.org:su-156015DiVA, id: diva2:1204387
Available from: 2018-05-08 Created: 2018-05-08 Last updated: 2025-02-07Bibliographically approved

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Freud, EyalNilsson, E. DouglasGlantz, Paul

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