The extratropical upper troposphere and lower stratosphere (Ex‐UTLS) is a transition region
between the stratosphere and the troposphere. The Ex‐UTLS includes the tropopause, a …

Abstract The Studies of Emissions and Atmospheric Composition, Clouds and Climate
Coupling by Regional Surveys (SEAC4RS) field mission based at Ellington Field, Texas …

Many prior studies clearly document episodic Asian pollution in the western US free
troposphere. Here, we examine the mechanisms involved in the transport of Asian pollution …

Multi-A**s Differential Optical Absorption Spectroscopy (MAX-DOAS) is a well-established
ground-based measurement technique for the detection of aerosols and trace gases …

The stratosphere contains~ 17% of Earth's atmospheric mass, but its existence was
unknown until 1902. In the following decades our knowledge grew gradually as more …

Every year during the Asian summer monsoon season from about mid-June to early
September, a stable anticyclonic circulation system forms over the Himalayas. This Asian …

Numerical weather prediction (NWP) models are known to possess a distinct moist bias in
the mid-latitude lower stratosphere, which is expected to affect the ability to accurately …

We present in situ observations of convectively injected water vapor in the lower
stratosphere from instruments aboard two aircraft operated during the Deep Convective …

Acetone is one of the most abundant oxygenated volatile organic compounds (VOCs) in the
atmosphere. The oceans impose a strong control on atmospheric acetone, yet the oceanic …

The global behavior of the extratropical tropopause transition layer (ExTL) is investigated
using O3, H2O, and CO measurements from the Atmospheric Chemistry Experiment Fourier …