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| Titel |
Characteristics of the nocturnal boundary layer inferred from ozone measurements onboard a Zeppelin airship |
| VerfasserIn |
Franz Rohrer, Xin Li, Andreas Hofzumahaus, Christian Ehlers, Frank Holland, Dieter Klemp, Keding Lu, Thomas F. Mentel, Astrid Kiendler-Scharr, Andreas Wahner |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250094299
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| Publikation (Nr.) |
 EGU/EGU2014-9703.pdf |
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| Zusammenfassung |
| The nocturnal boundary layer (NBL) is a sublayer within the planetary boundary layer (PBL)
which evolves above solid land each day in the late afternoon due to radiation cooling of the
surface. It is a region of several hundred meters thickness which inhibits vertical mixing. A
residual and a surface layer remain above and below the NBL. Inside the surface layer, almost
all direct emissions of atmospheric constituents take place during this time. This stratification
lasts until the next morning after sunrise. Then, the heating of the surface generates a
new convectionally mixed layer which successively eats up the NBL from below.
This process lasts until shortly before noon when the NBL disappears completely
and the PBL is mixed convectionally. Ozone measurements onboard a Zeppelin
airship in The Netherlands, in Italy, and in Finland are used to analyse this behaviour
with respect to atmospheric constituents and consequences for the diurnal cycles
observed in the surface layer, the nocturnal boundary layer, and the residual layer are
discussed. |
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