Implication of weekly and diurnal 14C calibration on hourly estimates of 
CO-based fossil fuel CO2 at a moderately polluted site in southwestern Germany

Vogel, F. R.; Hammer, S.; Steinhof, A.; Kromer, B.; Levin, I.

doi:10.1111/j.1600-0889.2010.00477.x

Datensatz

DATENSATZ AKTIONENEXPORT

Zur Ablage hinzufügen

Lokale TagsFreigabegeschichteDetailsÜbersicht

Freigegeben

Zeitschriftenartikel

Implication of weekly and diurnal ¹⁴C calibration on hourly estimates of CO-based fossil fuel CO₂ at a moderately polluted site in southwestern Germany

MPG-Autoren

/persons/resource/persons62571

Steinhof, A.
Service Facility 14C Lab, Dr. A. Steinhof, Max Planck Institute for Biogeochemistry, Max Planck Society;

Externe Ressourcen

http://dx.doi.org/10.1111/j.1600-0889.2010.00477.x
(Verlagsversion)

Volltexte (beschränkter Zugriff)

Für Ihren IP-Bereich sind aktuell keine Volltexte freigegeben.

Volltexte (frei zugänglich)

Es sind keine frei zugänglichen Volltexte in PuRe verfügbar

Ergänzendes Material (frei zugänglich)

Es sind keine frei zugänglichen Ergänzenden Materialien verfügbar

Zitation

Vogel, F. R., Hammer, S., Steinhof, A., Kromer, B., & Levin, I. (2010). Implication of weekly and diurnal ¹⁴C calibration on hourly estimates of CO-based fossil fuel CO₂ at a moderately polluted site in southwestern Germany. Tellus, Series B - Chemical and Physical Meteorology, 62(5), 512-520. doi:10.1111/j.1600-0889.2010.00477.x.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-000E-DB21-D

Zusammenfassung

A 7-year-long data set of integrated high-precision ¹⁴CO(2) observations combined with occasional hourly ¹⁴CO(2) flask data from the Heidelberg sampling site is presented. Heidelberg is located in the highly populated and industrialized upper Rhine valley in southwestern Germany. The ¹⁴CO(2) data are used in combination with hourly carbon monoxide (CO) observations to estimate regional hourly fossil fuel CO₂ (delta FFCO₂) mixing ratios. We investigate three different ¹⁴C calibration schemes to calculate delta FFCO₂: (1) the long-term median delta CO/delta FFCO₂ ratio of 14.6 ppb ppm-1 (mean: 15.5 +/- 5.6 ppb ppm-1), (2) individual (2-)week-long integrated delta CO/delta FFCO₂ ratios, which take into account the large week-to-week variability of +/- 5.6 ppb ppm-1 (1 Sigma; interquartile range: 5.5 ppb ppm-1), and (3) a calibration which also includes diurnal changes of the delta CO/delta FFCO₂ ratio. We show that in winter a diurnally changing delta CO/delta FFCO₂ ratio provides a much better agreement with the direct ¹⁴C-based hourly delta FFCO₂ estimates whereas summer values are not significantly improved with a diurnal calibration. Using integrated ¹⁴CO(2) samples to determine weekly mean delta CO/delta FFCO₂ ratios introduces a bias in the CO-based delta FFCO₂ estimates which can be corrected for with diurnal grab sample data. Altogether our ¹⁴C-calibrated CO-based method allows determining delta FFCO₂ at a semi-polluted site with a precision of approximately +/- 25%.