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| Titel |
Investigation of the diurnal pattern of the vertical distribution of pollen in the lower troposphere using LIDAR |
| VerfasserIn |
Y. M. Noh, H. Lee, D. Mueller, K. Lee, D. Shin, S. Shin, T. J. Choi, Y. J. Choi, K. R. Kim |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 15 ; Nr. 13, no. 15 (2013-08-07), S.7619-7629 |
| Datensatznummer |
250085613
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| Publikation (Nr.) |
 copernicus.org/acp-13-7619-2013.pdf |
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| Zusammenfassung |
| The diurnal pattern of the vertical distribution of biogenic pollen in the
lower troposphere was investigated by LIDAR. Meteorological data were taken
at the ground. Pollen concentrations were measured at the surface using a
Burkard 7-day-recording volumetric spore sampler. Aerosol extinction
coefficients and depolarization ratios at 532 nm were obtained from LIDAR
measurements in spring (4 May–2 June) 2009 in Gwangju, South Korea. Linear
volume depolarization ratios varied between 0.08 and 0.14 and were observed
only during daytime (09:00–17:00 local time (LT)) during days of high pollen
concentration (4 to 9 May). Daily average pollen concentrations ranged
1000–2500 cm−3 in the same period. The temporal evolution of the
vertical distribution of the linear volume depolarization ratio showed a
specific diurnal pattern. Linear volume depolarization ratios of more than
0.06, were measured near the surface in the morning. High depolarization
ratios were detected up to 2 km aboveground between 12:00 and 14:00 LT,
whereas high depolarization ratios were observed only close to the surface
after 17:00 LT. Low values of depolarization ratios (≤0.05) were
detected after 18:00 LT until the next morning. During the measurement
period, the daily variations of the high depolarization ratios close to the
surface showed correlation to number concentration measurements of pollen.
This finding suggests that high depolarization ratios could be attributed to
enhanced pollen concentrations. The diurnal characteristics of the high
values of depolarization ratios are thought to be closely associated with
turbulent transport. Diurnal and vertical characteristics of pollen, if
measured continuously, could be used to improve the accuracy of
pollen-forecasting models via data assimilation studies. |
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