Atmospheric Δ¹⁴CO₂ trend in Western European background air from 2000 to 2012

Figures & data

Fig. 1.  Δ¹⁴CO₂ trends in background air over Europe 2000–2012. (a) Individual data from Jungfraujoch with 1σ error bars together with a harmonic fit curve calculated through the monthly mean data; the outlier in spring 2000 is a contaminated sample and is not included in the monthly mean values of Table 1, (b) Schauinsland monthly means in comparison with the Jungfraujoch fit curve from (a) and May–August (spring and summer) mean values with 1σ standard deviation of the four monthly values.

Table 1. Monthly mean Δ¹⁴CO₂ data from Jungfraujoch and Schauinsland as well as monthly values from the fitted curve through Jungfraujoch data. Last column gives spring and summer mean values (including 1 sigma standard deviations of the monthly averaged data).

		Jungfraujoch	JFJ fit curve	Schauinsland	SIL summer
		Δ^14C	Δ^14C	Δ^14C	May–Aug
Decimal date	Month	[‰]	[‰]	[‰]	[‰]
2000.044	1	92.3	91.31	86.9
2000.126	2	91.0	90.03	89.3
2000.208	3	89.4	89.15	84.6
2000.291	4	85.2	88.74	83.7
2000.374	5	87.2	88.73	87.6	86.5±2.0
2000.458	6	88.8	88.96	84.1
2000.541	7	90.6	89.20	85.9
2000.626	8	92.3	89.21	88.5
2000.709	9	88.6	88.82	85.9
2000.792	10	86.5	87.95	85.3
2000.876	11	84.8	86.65	87.5
2000.959	12	84.7	85.09	85.4
2001.044	1	84.6	83.51	79.5
2001.125	2	80.9	82.16	73.4
2001.206	3	80.6	81.23	80.1
2001.289	4	77.3	80.82	74.7
2001.374	5	81.0	80.91	79.4	80.8±1.6
2001.458	6	82.1	81.34	80.8
2001.541	7	83.9	81.89	83.1
2001.626	8	82.8	82.30	79.8
2001.709	9	81.1	82.38	80.9
2001.792	10	83.0	82.02	83.3
2001.876	11	81.8	81.22	76.7
2001.959	12	80.5	80.12	77.1
2002.044	1	77.7	78.93	73.1
2002.125	2	75.2	77.88	71.6
2002.206	3	76.2	77.15	70.3
2002.289	4	74.6	76.85	67.5
2002.374	5	75.6	76.96	73.9	74.8±1.4
2002.458	6	78.6	77.33	75.1
2002.541	7	79.1	77.74	76.7
2002.626	8	80.9	77.94	73.5
2002.709	9	79.3	77.73	74.5
2002.792	10	76.2	77.00	70.5
2002.876	11	74.5	75.77	67.3
2002.959	12	68.3	74.18	67.9
2003.044	1	70.6	72.47	66.0
2003.125	2	69.8	70.93	62.0
2003.206	3	70.2	69.78	62.3
2003.289	4	66.6	69.17	65.8
2003.374	5	70.4	69.13	67.3	69.1±1.4
2003.458	6	70.4	69.54	70.2
2003.541	7	73.7	70.16	68.7
2003.626	8	71.9	70.74	70.1
2003.709	9	70.3	70.99	68.1
2003.792	10	69.5	70.75	67.5
2003.876	11	68.4	69.95	65.3
2003.959	12	65.7	68.67	63.6
2004.044	1	63.4	67.10	61.5
2004.125	2	64.0	65.48	58.7
2004.206	3	65.5	64.10	56.3
2004.289	4	62.5	63.13	57.7
2004.374	5	62.3	62.69	56.0
2004.458	6	64.3	62.74	63.4	61.5±3.7
2004.541	7	63.3	63.13	62.9
2004.626	8	64.0	63.66	63.9
2004.709	9	65.2	64.10	62.6
2004.792	10	62.1	64.05	62.3
2004.876	11	63.1	63.47	59.0
2004.959	12	63.4	62.62	61.4
2005.044	1	63.1	61.69	56.1
2005.125	2	60.1	60.86	49.0
2005.206	3	60.1	60.28	51.8
2005.289	4	56.1	60.03	54.3
2005.374	5	62.3	60.09	58.4	57.9±0.8
2005.458	6	59.3	60.36	57.2
2005.541	7	63.9	60.66	58.7
2005.626	8	60.1	60.82	57.1
2005.709	9	60.8	60.71	54.6
2005.792	10	59.3	60.28	53.6
2005.876	11	60.0	59.55	54.8
2005.959	12	57.2	58.65	50.8
2006.044	1	58.0	57.76	51.1
2006.125	2	58.0	57.06	46.9
2006.206	3	55.4	56.68	48.4
2006.289	4	54.8	56.69	53.6
2006.374	5	56.4	57.03	55.3	57.0±2.0
2006.458	6	59.2	57.57	55.2
2006.541	7	59.1	58.11	58.8
2006.626	8	62.0	58.43	58.5
2006.709	9	57.1	58.38	54.6
2006.792	10	57.8	57.88	56.3
2006.876	11	52.6	56.95	55.2
2006.959	12	54.0	55.71	54.1
2007.044	1	54.7	54.37	56.9
2007.125	2	54.2	53.14	49.3
2007.206	3	50.5	52.21	46.8
2007.289	4	52.9	51.70	45.3
2007.373	5	51.0	51.62	48.7	50.1±1.0
2007.456	6	53.0	51.88	50.3
2007.540	7	53.2	52.31	50.7
2007.625	8	52.8	52.71	50.7
2007.708	9	52.9	52.89	53.3
2007.792	10	49.6	52.74	45.0
2007.875	11	49.7	52.22	46.1
2007.959	12	52.4	51.40	46.1
2008.044	1	51.3	50.40	45.4
2008.125	2	51.9	49.40	44.4
2008.206	3	49.3	48.56	43.7
2008.289	4	46.2	47.97	43.5
2008.374	5	42.5	47.65	44.2	47.1±2.7
2008.458	6	46.0	47.56	45.6
2008.540	7	49.1	47.56	50.0
2008.625	8	49.3	47.50	48.6
2008.708	9	46.6	47.26	47.0
2008.792	10	49.1	46.77	42.7
2008.875	11	44.5	46.06	42.4
2008.959	12	42.3	45.22	38.4
2009.044	1	45.0	44.43	39.4
2009.125	2	43.8	43.87	37.3
2009.206	3	45.3	43.70	37.6
2009.289	4	39.4	43.98	38.9
2009.374	5	46.3	44.71	43.6	46.7±2.2
2009.458	6	48.2	45.74	48.8
2009.540	7	49.5	46.85	46.8
2009.625	8	49.8	47.80	47.6
2009.708	9	47.8	48.36	42.7
2009.792	10	47.3	48.38	na
2009.875	11	44.7	47.80	39.0
2009.959	12	44.7	46.73	39.3
2010.044	1	45.1	45.33	32.3
2010.125	2	45.1	43.88	34.8
2010.206	3	38.8	42.61	37.4
2010.289	4	41.5	41.73	33.9
2010.374	5	42.2	41.36	38.0	40.0±2.7
2010.458	6	39.9	41.48	37.8
2010.541	7	42.6	41.97	40.7
2010.626	8	44.5	42.63	43.5
2010.709	9	47.1	43.22	41.5
2010.792	10	41.4	43.47	42.2
2010.876	11	42.5	42.97	37.7
2010.959	12	41.1	42.13	33.6
2011.044	1	39.7	41.10	38.2
2011.125	2	40.5	40.08	32.0
2011.206	3	39.3	39.23	31.4
2011.289	4	39.5	38.69	35.8
2011.374	5	38.0	38.49	35.6	39.0±2.4
2011.458	6			39.4
2011.541	7			41.0
2011.626	8			40.1
2011.709	9			37.8
2011.792	10			32.6
2011.876	11			33.4
2011.959	12			32.8
2012.044	1			32.8
2012.125	2			25.2
2012.206	3			33.7
2012.289	4			31.8
2012.374	5			28.7	31.5±2.0
2012.458	6			31.4
2012.541	7			33.4
2012.626	8			32.3
2012.709	9			32.5