In this section
@inproceedings{Saboya:2020:10.1002/essoar.10505573.1,
author = {Saboya, E and Zazzeri, G and Graven, H and Manning, AJ and Michel, SE},
doi = {10.1002/essoar.10505573.1},
title = {Continuous CH and δ¹³CH Measurements in London Demonstrate Under-Reported Natural Gas Leakage},
url = {http://dx.doi.org/10.1002/essoar.10505573.1},
year = {2020}
}
TY - CPAPER
AB - <jats:p>Assessment of bottom-up greenhouse gas emissions estimates throughindependent methods is needed to demonstrate whether reported values areaccurate or if bottom-up methodologies need to be refined. Previousstudies of measurements of atmospheric methane (CH4) in London revealedthat inventories substantially underestimated the amount of natural gasCH4 1,2. We report atmospheric CH4 concentrations and δ13CH4measurements from 91桃色 since early 2018 using aPicarro G2201-i analyser. Measurements from May 2019-Feb. 2020 werecompared to the values simulated using the dispersion model NAME coupledwith the UK national atmospheric emissions inventory, NAEI, and theglobal inventory, EDGAR, for emissions outside the UK. Simulations ofCH4 concentration and δ13CH4 values were generated using nested NAMEback-trajectories with horizontal spatial resolutions of 2 km, 10 km and30 km. Observed concentrations were underestimated in the simulations by12 %, and there was no correlation between the measured and simulatedδ13CH4 values. CH4 from waste sources and natural gas comprised of 32.1% and 27.5 % of the CH4 added by regional emissions. To estimate theisotopic source signatures for individual pollution events, an algorithmwas created for automatically analysing measurement data by using theKeeling plot approach. Over 70 % of source signatures had values higherthan -50 ‰, suggesting large amounts of natural gas CH4. The analysesbased on model-data comparison of δ13CH4 and on Keeling plot sourcesignature emission both indicate that emissions due to natural gas leaksin London are being under-reported in the NAEI. These results suggestthat estimates of CH4 emissions in urban areas need to be revised in theCH4 emissions inventories. 1 Helfter, C. et al. (2016), AtmosphericChemistry and Physics, 16(16), pp. 10543-10557 2 Zazzeri, G. et al.(2017), Scientific Reports, 7(1), pp. 1-13</jats:p>
AU - Saboya,E
AU - Zazzeri,G
AU - Graven,H
AU - Manning,AJ
AU - Michel,SE
DO - 10.1002/essoar.10505573.1
PY - 2020///
TI - Continuous CH and δ¹³CH Measurements in London Demonstrate Under-Reported Natural Gas Leakage
UR - http://dx.doi.org/10.1002/essoar.10505573.1
UR - https://doi.org/10.1002/essoar.10505573.1
ER -