[1] We report measurements of light (C2–C4) nonmethane hydrocarbons (NMHCs) and C1–C4 alkyl nitrates made at Summit, Greenland, over a full annual cycle (June 1997– 1998). The remoteness of the Summit camp from industrial source regions resulted in trends of these trace gases that showed a clear seasonal variation with low variability. Variability (calculated as the percentage 1-sigma deviation...

Sources, optical properties, and chemical composition of atmospheric brown carbon (BrC) aerosol are uncertain, making it challenging to estimate its contribution to radiative forcing. Furthermore, optical properties of BrC may change significantly during its atmospheric aging. We examined the effect of photolysis on the molecular composition, mass absorption coefficient, and fluorescence of sec...

Background: In recent years, Tehran has faced major problems with air pollution for many reasons, and this issue has become a critical point in most of the days. However, less attention has been paid to the indoor air pollutants in exercise centers and their possible health effects. In this research, it was tried to briefly describe the characteristics and chemical composition of the aerosols p...

Atmospheric correction algorithms allow the reduction of atmospheric components influence in the acquisition of earth’s surface reflectance properties. Quantifying this reduction is critical for the remote sensing science. Different regions have different natural or man-made composition and respond differently for each algorithm. Highly turbid inland waters are significantly sensitive to atmosp...

[1] The isotopic anomaly of oxygen in atmospheric CO2 is caused by exchange reactions with isotopically anomalous O(D) in the middle atmosphere. In the stratosphere, the major source of O(D) is O3 photolysis; O3 is known to possess mass-independent isotopic composition, with dO3 dO3 100% relative to atmospheric O2. Higher in the mesosphere, Lyman a-driven photodissociation of O2 provides a more...