Nickolay A. Krotkov

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[1] The Dutch-Finnish Ozone Monitoring Instrument (OMI) launched on the NASA Aura satellite in July 2004 offers unprecedented spatial resolution, coupled with contiguous daily global coverage, for space-based UV measurements of sulfur dioxide (SO 2). We present a first validation of the OMI SO 2 data with in situ aircraft measurements in NE China in April(More)
[1] Photomineralization of terrigenous dissolved organic matter (tDOM) in the Arctic Ocean is limited by persistent sea ice cover that reduces the amount of ultraviolet (UV) radiation reaching the underlying water column. UV-dependent processes are likely to accelerate as a result of shrinking sea ice extent and decreasing ice thickness caused by climatic(More)
Satellite instruments currently provide global maps of surface UV irradiance by combining backscattered radiance data with radiative transfer models. The models are often limited by uncertainties in physical input parameters of the atmosphere and surface. Global mapping of the underwater UV irradiance creates further challenges for the models. The(More)
Comprehensive review of studies of satellite data applied to emissions estimation. Overview of retrievals for eight major tropospheric air pollutants. Techniques to enhance the usefulness of satellite retrievals. Identification of target source categories for satellite data application. Recommendations on ways to improve the usability of satellite(More)
[1] The meteorological mechanisms for lofting trace gases and aerosols out of the planetary boundary layer (PBL) into the free troposphere are key to understanding local air pollution problems as well as regional and global atmospheric chemistry and climate issues. Over the North American continent, convective storms and lifting in warm conveyor belts(More)
[1] On 5 April 2005, during the East Asian Study of Tropospheric Aerosols: An International Regional Experiment (EAST-AIRE) aircraft campaign, heavy loadings of SO 2 (20 ppb near ground, 1–3 ppb at $2 km altitude) and dust with aerosol optical depth of $1 were measured over Shenyang, an industrialized city $600 km NE of Beijing. In this study, Ozone(More)
Satellite measurements of volcanic sulfur dioxide (SO 2) emissions can provide critical information for aviation hazard mitigation, particularly when ash detection techniques fail. Recent developments in space-based SO 2 monitoring are discussed, focusing on daily, global ultraviolet (UV) measurements by the Ozone Monitoring Instrument (OMI) on NASA's Aura(More)