2015
DOI: 10.5194/acp-15-13739-2015
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Analysis of CO<sub>2</sub> mole fraction data: first evidence of large-scale changes in CO<sub>2</sub> uptake at high northern latitudes

Abstract: Abstract. Atmospheric variations of carbon dioxide (CO 2 ) mole fraction reflect changes in atmospheric transport and regional patterns of surface emission and uptake. Here we present a study of changes in the observed high northern latitude CO 2 seasonal cycle. We report new estimates for changes in the phase and amplitude of the seasonal variations, indicative of biospheric changes, by spectrally decomposing multi-decadal records of surface CO 2 mole fraction using a wavelet transform to isolate the changes … Show more

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Cited by 33 publications
(58 citation statements)
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“…The background concentration can be determined by applying statistical methods to high-frequency observations (Barlow et al, 2015;Ruckstuhl et al, 2012) or estimated by models (Balzani Lööv et al, 2008;Lunt et al, 2016). In this work, high-frequency data existed only for 12 CO 2 but not its isotopes and there was no model-derived background available for the isotopes; therefore, MHD data were used as background for the simulation of all CO 2 isotopes.…”
Section: Name Simulationsmentioning
confidence: 99%
See 1 more Smart Citation
“…The background concentration can be determined by applying statistical methods to high-frequency observations (Barlow et al, 2015;Ruckstuhl et al, 2012) or estimated by models (Balzani Lööv et al, 2008;Lunt et al, 2016). In this work, high-frequency data existed only for 12 CO 2 but not its isotopes and there was no model-derived background available for the isotopes; therefore, MHD data were used as background for the simulation of all CO 2 isotopes.…”
Section: Name Simulationsmentioning
confidence: 99%
“…This has motivated researchers to combine 14 CO 2 observations with other tracers, such as carbon monoxide (CO), to improve temporal coverage (Gamnitzer et al, 2006;Levin and Karstens, 2007;Lopez et al, 2013;Miller et al, 2012;Turnbull et al, 2006Turnbull et al, , 2011. For example, high-frequency CO data have been used with 14 CO 2 measurements to regularly calibrate the CO enh (enhancement of CO from background concentration) to ffCO 2 ratio, based on weekly 14 C measurements in Europe (Berhanu et al, 2017;Levin and Karstens, 2007). However, using a CO enh : ffCO 2 ratio to estimate higherfrequency ffCO 2 can be challenging to implement even when using a well-calibrated ratio because the ratios of different sources and sinks impacting each measurement can vary considerably as each source emits with its own CO : ffCO 2 ratio (Adams et al, 2016).…”
Section: Introductionmentioning
confidence: 99%
“…We use a wavelet transform, described in detail in Appendix B (Torrence and Compo, 1998; 50 Barlow et al, 2015;Mackie et al, 2016), to spectrally decompose the flask CH 4 mole fraction data collected at seven high northern latitude sites ( Figure 1). The wavelet transform decomposes a time series into time-frequency space, allowing us to investigate the dominant modes of variability and how they change with time.…”
Section: Methodsmentioning
confidence: 99%
“…Here, we show that observed changes in the peak-to-peak amplitude of the seasonal cycle of atmospheric CH 4 , isolated using a wavelet transform (Barlow et al, 2015) provide additional information about changes in high northern latitude fluxes of CH 4 .…”
mentioning
confidence: 86%
“…The background concentration can be determined by applying statistical methods to high-frequency observations (Barlow et al, 2015;Ruckstuhl et al, 2012) or estimated by models (Balzani Lööv et al, 2008;Lunt et al, 2016). In this work, highfrequency data existed only for 12 CO2 but not its isotopes and there was no model-derived background available for the isotopes, therefore, MHD data was used as background for the simulation of all CO 2 isotopes.…”
Section: Name Simulationsmentioning
confidence: 99%