TY - JOUR
T1 - Detailed analysis of the isotopic composition of CO and characterization of the air masses arriving at Mount Sonnblick (Austrian Alps)
AU - Gros, V.
AU - Bräunlich, M.
AU - Röckmann, T.
AU - Jöckel, P.
AU - Bergamaschi, P.
AU - Brenninkmeijer, C. A. M.
AU - Rom, W.
AU - Kutschera, W.
AU - Kaiser, A.
AU - Scheel, H. E.
AU - Mandl, M.
AU - van der Plicht, J.
AU - Possnert, G.
N1 - Relation: http://www.agu.org/
Rights: American Geophysical Union
PY - 2001/2/16
Y1 - 2001/2/16
N2 - Air sampling for analysis of CO and its isotopic composition (C-13, O-18, and C-14) has been performed at the alpine station Sonnblick(47 degreesN, 13 degreesE, 3106 m above sea level) since September 1996. A high degree of variability is observed, which is due to the wide variation in the origin of air masses sampled. On the basis of the CO and isotope results, a classification of the different samples is performed. Other data such as Be-7, O-3, relative humidity, and back trajectories are used to give additional information about the air mass origin. Background values, representative of the NH midlatitudes free troposphere, are observed about 50% of the time and are used to define seasonal cycles. CO and its isotopes show a minimum in summer and a maximum in winter with extreme values of 90 and 160 ppb for CO, -30 and -25 parts per thousand for delta C-13, 0 and 8 parts per thousand for delta O-18, and 8 and 20 molecules cm(-3) STP for (CO)-C-14. CO and stable isotope data are compared with results from a three-dimensional model (TM2). Generally good agreement supports the CO, delta (CO)-C-13, and deltaC(18)O source/sink distributions inferred by the model. According to model calculations, fossil fuel combustion contributes 35% in summer and 50% in winter of total CO for such a midlatitude location. Other categories of sampled air are "subtropical," "polluted," and "stratospheric" and are observed 24%, 18%, and 4% of the time. Corresponding signatures of CO and its isotopic variations are presented, and some specific events are discussed.
AB - Air sampling for analysis of CO and its isotopic composition (C-13, O-18, and C-14) has been performed at the alpine station Sonnblick(47 degreesN, 13 degreesE, 3106 m above sea level) since September 1996. A high degree of variability is observed, which is due to the wide variation in the origin of air masses sampled. On the basis of the CO and isotope results, a classification of the different samples is performed. Other data such as Be-7, O-3, relative humidity, and back trajectories are used to give additional information about the air mass origin. Background values, representative of the NH midlatitudes free troposphere, are observed about 50% of the time and are used to define seasonal cycles. CO and its isotopes show a minimum in summer and a maximum in winter with extreme values of 90 and 160 ppb for CO, -30 and -25 parts per thousand for delta C-13, 0 and 8 parts per thousand for delta O-18, and 8 and 20 molecules cm(-3) STP for (CO)-C-14. CO and stable isotope data are compared with results from a three-dimensional model (TM2). Generally good agreement supports the CO, delta (CO)-C-13, and deltaC(18)O source/sink distributions inferred by the model. According to model calculations, fossil fuel combustion contributes 35% in summer and 50% in winter of total CO for such a midlatitude location. Other categories of sampled air are "subtropical," "polluted," and "stratospheric" and are observed 24%, 18%, and 4% of the time. Corresponding signatures of CO and its isotopic variations are presented, and some specific events are discussed.
KW - ATMOSPHERIC CARBON-MONOXIDE
KW - (CO)-C-14
KW - JUNGFRAUJOCH
KW - SWITZERLAND
KW - TROPOSPHERE
KW - MODEL
KW - FRACTIONATION
KW - SEASONALITY
KW - TRANSPORT
KW - ABUNDANCE
U2 - 10.1029/2000JD900509
DO - 10.1029/2000JD900509
M3 - Article
VL - 106
SP - 3179
EP - 3193
JO - Journal of geophysical research-Atmospheres
JF - Journal of geophysical research-Atmospheres
SN - 2169-897X
IS - 3
ER -