Exploring the role of nitrogen chemistry in the forest atmosphere during the BEACHON-Rocky Mountain Biogenic Aerosol Study
Nitrogen oxides, through their interactions with volatile organic compounds (VOCs), NH3, OH, and other gas-phase species, exert important controls on the lifetime and fate of atmospheric VOCs and the formation of secondary aerosol. During the night, the nitrate (NO3) radical is an important oxidant, reacting rapidly with unsaturated VOCs, many of which are biogenic in origin (BVOC), to produce organic nitrates and other oxidized VOCs, some of which lead to the formation of secondary organic aerosol.
MOPITT Multispectral CO Products Released
The new Version 5 (“V5”) MOPITT (Measurements of Pollution in the Troposphere) product for carbon monoxide (CO) is the first satellite product to exploit simultaneous near-infrared (NIR) and thermal-infrared (TIR) observations to enhance retrieval sensitivity in the lower troposphere. Since most major sources of tropospheric CO are found at or near the Earth's surface, this feature will improve air quality forecasts and studies of CO sources.
Aura/HIRDLS reveals global characteristics of the double tropopause
Aura’s High Resolution Dynamics Limb Sounder (HIRDLS) reveals the global pattern of the double tropopause using the HIRDLS high vertical resolution profiles. Composition and structure near the tropopause are important for the Earth radiative balance and quantifying transport of ozone and other stratospheric species into the troposphere.
Progress in Understanding Climate-Relevant Processes in the Upper Troposphere and Lower Stratosphere
The extratropical upper troposphere and lower stratosphere (Ex‐UTLS) is a transition region between the stratosphere and the troposphere. In this region, dynamics, chemistry, clouds and radiation are strongly coupled, which makes this region important for chemistry-climate interactions. Significant progress has been made in understanding the climate-relevant processes in this region during the last decade, assisted by a suite of new observational studies.

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