Publication Abstracts
Dlugokencky et al. 2001
Dlugokencky, E.J., , K.A. Masarie, P.M. Lang, and E.S. Kasischke, 2001: Measurements of an anomalous global methane increase during 1998. Geophys. Res. Lett., 28, 499-502, doi:10.1029/2000GL012119.
Measurements of atmospheric methane from a globally distributed network of air sampling sites indicate that the globally averaged CH4 growth rate increased from an average of 3.9 ppb /yr during 1995-1997 to 12.7±0.6 ppb in 1998. The global growth rate then decreased to 2.6±0.6 ppb during 1999, indicating that the large increase in 1998 was not a return to the larger growth rates observed during the late-1970s and early-1980s. The increased growth rate during 1998 corresponds to an increase in the imbalance between CH4 sources and sinks equal to ∼24 Tg CH4, the largest perturbation observed in 16 years of measurements. We suggest that wetland and boreal biomass burning sources may have contributed to the anomaly. An adaptation of a global process-based model, which included soil-temperature and precipitation anomalies, was used to calculate emission anomalies of 11.6 Tg CH4 from wetlands north of 30°N and 13 Tg CH4 for tropical wetlands during 1998 compared to average emissions calculated for 1982-1993. For 1999, calculated wetland emission anomalies were negative for high northern latitudes and the tropics, contributing to the low growth rate observed in 1999. Also 1998 was a severe fire year in boreal regions where ∼1.3×105 km2 of forest and peat land burned releasing an estimated 5.7 Tg CH4.
Export citation: [ BibTeX ] [ RIS ]
BibTeX Citation
@article{dl06000k,
author={Dlugokencky, E. J. and Walter, B. P. and Masarie, K. A. and Lang, P. M. and Kasischke, E. S.},
title={Measurements of an anomalous global methane increase during 1998},
year={2001},
journal={Geophys. Res. Lett.},
volume={28},
pages={499--502},
doi={10.1029/2000GL012119},
}
[ Close ]
RIS Citation
TY - JOUR ID - dl06000k AU - Dlugokencky, E. J. AU - Walter, B. P. AU - Masarie, K. A. AU - Lang, P. M. AU - Kasischke, E. S. PY - 2001 TI - Measurements of an anomalous global methane increase during 1998 JA - Geophys. Res. Lett. VL - 28 SP - 499 EP - 502 DO - 10.1029/2000GL012119 ER -
[ Close ]
