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Relationship between CO2 at a rural site and integral measures of atmospheric stagnation, recirculation, and ventilation
- Source :
- Naturwissenschaften. 98:565-574
- Publication Year :
- 2011
- Publisher :
- Springer Science and Business Media LLC, 2011.
-
Abstract
- Integral quantities, wind run, S, and recirculation factor, R, useful for describing air flow, are calculated and combined with CO(2) mixing ratios. Meteorological observations were obtained from a RASS sodar and CO(2) mixing ratios from a continuous analyzer installed at a rural site in the upper Spanish plateau. The measuring campaign spread over 3 years and two approaches were followed. The first approach considered integral quantities on a daily basis and two classifications of air flow, to date scarcely used. The first classification distinguished among stagnation, recirculation, and ventilation, the second considering synoptic, meso-, and local scales. Moreover, 52.94% of daily values handled in this paper corresponded to ventilation and 49.70% to synoptic scale. The main goal of this approach is the subsequent link between the two classifications: the synoptic scale was associated with ventilation, mesoscale with recirculation and local scale partially with recirculation. CO(2) observations were distributed in air flow groups following these classifications and mesoscale processes were satisfactorily described since noticeable evidence of transport from nearby cities was observed. In the second approach, S and R pairs were used and CO(2) mixing ratios were distributed following percent intervals of ventilation, calculated by binning these pairs. The main goal of the second approach is to consider only three groups of mixing ratios. In the first group, with high ventilation, mixing ratios were low. With intermediate ventilation, mixing ratios were medium, and with low ventilation mixing ratios were high. A contrast of 21 ppm between the third and first groups was obtained at the 95th percentile. Finally, the second group provided a contrast of 3 ppm between north and south directions and also between east and west attributed to transport from nearby cities.
- Subjects :
- Air Movements
Rural Population
Percentile
Meteorological Concepts
Wind run
Meteorology
Airflow
Mesoscale meteorology
SODAR
Wind
General Medicine
Carbon Dioxide
Models, Theoretical
law.invention
Spain
law
Synoptic scale meteorology
Ventilation (architecture)
Environmental science
Ecology, Evolution, Behavior and Systematics
Mixing (physics)
Environmental Monitoring
Subjects
Details
- ISSN :
- 14321904 and 00281042
- Volume :
- 98
- Database :
- OpenAIRE
- Journal :
- Naturwissenschaften
- Accession number :
- edsair.doi.dedup.....37119ccb45218146e9e7a70a5da17f9a