Measurements of the stable carbon isotope ratio (δ 13 C) on annual tree rings offer new
opportunities to evaluate mechanisms of variations in photosynthesis and stomatal …

Adding nitrogen fertilizers to agricultural soils contributes to increasing concentrations of
nitrous oxide (N2O) in the atmosphere. However, the impacts of N addition on soil organic …

In regions where there are multiple sources of methane (CH 4) in close proximity, it can be
difficult to apportion the CH 4 measured in the atmosphere to the appropriate sources. In the …

We have analyzed near-global stratospheric data (and mesospheric data as well for H 2 O)
in terms of absolute abundances, variability, and trends for O 3, H 2 O, HCl, N 2 O, and HNO …

The outbreak of COVID-19 pandemic was accompanied by global mobility restrictions and
slowdown in manufacturing activities. Accordingly, cities experienced a significant decrease …

The isotopic composition of atmospheric nitrous oxide (N2O) was measured
semicontinuously, at∼ 35 min frequency in intermittent periods of 1–6 days over one and a …

Methane (CH 4) is a potent greenhouse gas and also plays a significant role in tropospheric
chemistry. High-frequency (sub-hourly) measurements of CH 4 and carbon isotopic ratio (δ …

Observations of atmospheric CO 2 mole fraction and the 13 C∕ 12 C ratio (expressed as δ
13 C) in urban airsheds provide constraints on the roles of anthropogenic and natural …

Abstract From February to April 2019, near-surface CO 2 and CH 4 concentrations and
carbon isotopic compositions (δ 13 C-CO 2 and δ 13 C-CH 4) were monitored at four …

Although atmospheric CO 2 observations are becoming increasingly widespread in China,
the identification of CO 2 emission sources is still scarce, especially in undeveloped Central …