 |
| Titel |
Greenhouse gas measurements in the upper Spanish plateau |
| VerfasserIn |
M. L. Sánchez, I. A. Pérez, M. A. García, N. Pardo |
| Konferenz |
EGU General Assembly 2012
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250059918
|
|
|
|
|
|
| Zusammenfassung |
| Since May 2009, the continuous CO2 measurements performed from 2000 in a rural area in
the Spanish plateau (CIBA station) have been extended to other greenhouse gases in the
framework of the CCGG NOAA/ESRL cooperative network. Current measurements are
performed using a Picarro cavity ring down spectroscopy analyzer together with those
provided from NOAA, through the flasks weekly air sampling data. Available data
include CO2, CH4, N2O, CO, H2, SF6 and the δ13C and δ18O isotopic fractions. The
inter-comparison results of CO2 and CH4 recorded by the Picarro analyser and
those concurrently obtained in the flasks weekly data, showed very satisfactory
results revealing the low drift of the continuous analyser, especially for the CO2
concentrations.
This paper presents the most salient results obtained, namely, background concentrations,
seasonal cycle and preliminary annual trends. The main results obtained can be summarized
as follows: a) A high annual increasing CO2trend from 2000, 2.82 ppm/y, a value consistent
with the increase in CO2emissions in Spain during the last decade. The slight decline
observed over the last two years, in agreement with the decline in Spanish emissions,
supports the interpretation given. b) The expected “anticorrelation” between CO2 and δ13C
and CO2 ambient concentrations as well as the annual trends. c) Relatively high CH4 mean
concentrations, 1888.6 ppb, featured by a significant impact in the SE-SSE sectors, proving
the local influence of a non-verified emitting source yet. d) N2O and SF6 mean
concentrations consistent with those reported in other continental sites across the
Northern Hemisphere, 324.1 ppb and 7.3 ppt, respectively. Both exhibited evident
linear increasing trends of 1.00 ppb/y and 0.26 ppt/y, respectively. Due to the still
limited available temporal series, additional measurements are necessary in order to
confirm the future evolution of the trends currently reported during the coming years. |
|
|
|
|
|
|