A factor of 2.5 increase in the global abundance of atmospheric methane (CH4) since 1750
contributes 0.5 Wm− 2 to total direct radiative forcing by long-lived greenhouse gases (2.77 …

Air Emissions from Animal Feeding Operations: Current Knowledge, Future Needs
discusses the need for the US Environmental Protection Agency to implement a new method …

The Southern Ocean plays an important role in determining atmospheric carbon dioxide
(CO2), yet estimates of air-sea CO2 flux for the region diverge widely. In this study, we …

Based on about 20 years of NOAA/CMDL's atmospheric CO 2 concentration data and a
global atmospheric tracer transport model, we estimate interannual variations and spatial …

Sixteen mixtures of methane (CH4) in dry air were prepared using a gravimetric technique to
define a CH4 standard gas scale covering the nominal range 300–2600 nmol mol− 1. It is …

We present new measurements of δ13C of CO2 extracted from a high‐resolution ice core
from Law Dome (East Antarctica), together with firn measurements performed at Law Dome …

A reliable and precise in situ CO 2 and CO analysis system has been developed and
deployed at eight sites in the NOAA Earth System Research Laboratory's (ESRL) Global …

The stable isotope ratios of atmospheric CO2 (18O/16O and 13C/12C) have been monitored
since 1977 to improve our understanding of the global carbon cycle, because biosphere …

High‐precision, multispecies measurements of flask air samples since 1992 from CSIRO's
global sampling network reveal strong correlation among interannual growth rate variations …

Systematic, operational, long‐term observations of the terrestrial carbon cycle (including its
interactions with water, energy and nutrient cycles and ecosystem dynamics) are important …