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| Titel |
How well do tall-tower measurements characterize the CO2 mole fraction distribution in the planetary boundary layer? |
| VerfasserIn |
L. Haszpra, Z. Barcza, T. Haszpra, Zs. Pátkai, K. J. Davis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 4 ; Nr. 8, no. 4 (2015-04-07), S.1657-1671 |
| Datensatznummer |
250116292
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| Publikation (Nr.) |
 copernicus.org/amt-8-1657-2015.pdf |
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| Zusammenfassung |
| Planetary boundary layer (PBL) CO2 mole fraction data are needed by
transport models and carbon budget models as both input and reference for
validation. The height of in situ CO2 mole fraction measurements is
usually different from that of the model levels where the data are needed;
data from short towers, in particular, are difficult to utilize in
atmospheric models that do not simulate the surface layer well. Tall-tower
CO2 mole fraction measurements observed at heights ranging from 10 to
115 m above ground level at a rural site in Hungary and regular airborne
vertical mole fraction profile measurements (136 vertical profiles) above
the tower allowed us to estimate how well a tower of a given height could
estimate the CO2 mole fraction above the tower in the PBL. The
statistical evaluation of the height-dependent bias between the real PBL
CO2 mole fraction profile (measured by the aircraft) and the
measurement at a given elevation above the ground was performed separately
for the summer and winter half years to take into account the different
dynamics of the lower troposphere and the different surface CO2 flux in
the different seasons. The paper presents (1) how accurately the vertical
distribution of CO2 in the PBL can be estimated from the measurements
on the top of a tower of height H; (2) how tall of a tower would be needed for the
satisfaction of different requirements on the accuracy of the estimation of
the CO2 vertical distribution; (3) how accurate of a CO2 vertical
distribution estimation can be expected from the existing towers; and (4) how
much improvement can be achieved in the accuracy of the estimation of
CO2 vertical distribution by applying the virtual tall-tower concept. |
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