This paper presents a compilation of atmospheric radiocarbon for the period 1950–2019,
derived from atmospheric CO2 sampling and tree rings from clean-air sites. Following the …

Plant water‐use efficiency (WUE, the carbon gained through photosynthesis per unit of
water lost through transpiration) is a tracer of the plant physiological controls on the …

The past century has been a time of unparalleled changes in global climate and global
biogeochemistry. At the forefront of the study of these changes are regular time-series …

Abstract In this “Grand Challenges” paper, we review how the carbon isotopic composition of
atmospheric CO2 has changed since the Industrial Revolution due to human activities and …

The transfer of photosynthetically produced organic carbon from surface to mesopelagic
waters draws carbon dioxide from the atmosphere. However, current observation-based …

Southeast Asia has emerged as an important region for understanding hominin and
mammalian migrations and extinctions. High-profile discoveries have shown that Southeast …

Accurate knowledge of 13C isotopic signature (δ13C) of methane from each source is
crucial for separating biogenic, fossil fuel and pyrogenic emissions in bottom-up and top …

The stable carbon isotopic composition (δ 13 C) measured in tree rings is a standard proxy
for paleoclimate reconstructions and is increasingly being used as a paleophysiological …

Atmospheric concentrations of methane, a powerful greenhouse gas, have strongly
increased since 2007. Measurements of stable carbon isotopes of methane can constrain …

Since the 1950s, observations of radiocarbon (14C) in tropospheric carbon dioxide (CO2)
have been conducted in both hemispheres, documenting the so-called nuclear “bomb spike” …