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| Titel |
Trajectory mapping of middle atmospheric water vapor by a mini network of NDACC instruments |
| VerfasserIn |
M. Lainer, N. Kämpfer, B. Tschanz, G. E. Nedoluha, S. Ka, J. J. Oh |
| 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 ; 15, no. 16 ; Nr. 15, no. 16 (2015-08-31), S.9711-9730 |
| Datensatznummer |
250120003
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| Publikation (Nr.) |
 copernicus.org/acp-15-9711-2015.pdf |
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| Zusammenfassung |
| The important task to observe the global coverage of middle
atmospheric trace gases like water vapor or ozone usually is
accomplished by satellites. Climate and atmospheric studies rely
upon the knowledge of trace gas distributions throughout the
stratosphere and mesosphere. Many of these gases are currently
measured from satellites, but it is not clear whether this
capability will be maintained in the future. This could lead to
a significant knowledge gap of the state of the atmosphere. We
explore the possibilities of mapping middle atmospheric water vapor
in the Northern Hemisphere by using Lagrangian trajectory
calculations and water vapor profile data from a small network of
five ground-based microwave radiometers. Four of them are operated
within the frame of NDACC (Network for the Detection of Atmospheric
Composition Change). Keeping in mind that the instruments are based
on different hardware and calibration setups, a height-dependent
bias of the retrieved water vapor profiles has to be expected among
the microwave radiometers. In order to correct and harmonize the
different data sets, the Microwave Limb Sounder (MLS) on the Aura
satellite is used to serve as a kind of traveling
standard. A domain-averaging TM (trajectory mapping) method is
applied which simplifies the subsequent validation of the quality of
the trajectory-mapped water vapor distribution towards direct
satellite observations. Trajectories are calculated forwards and
backwards in time for up to 10 days using 6 hourly meteorological
wind analysis fields. Overall, a total of four case studies of
trajectory mapping in different meteorological regimes are
discussed. One of the case studies takes place during a major sudden
stratospheric warming (SSW) accompanied by the polar vortex
breakdown; a second takes place after the reformation of stable
circulation system. TM cases close to the fall equinox and June
solstice event from the year 2012 complete the study, showing the
high potential of a network of ground-based remote sensing
instruments to synthesize hemispheric maps of water vapor. |
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