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| Titel |
Intercomparing Isotopic Water Vapour Measurements to determine spatial and temporal representativity |
| VerfasserIn |
Nicholas Deutscher, Stephen Parkes, Camille Risi, David Griffith, Christian Frankenberg, Justus Notholt, Nicholas Jones |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250055184
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| Zusammenfassung |
| The atmospheric stable isotope composition of water vapour provides valuable insights
into the atmospheric hydrological cycle. The composition is determined by the
source of water vapour to the atmosphere, condensation and post-condensation
processes, and mixing. In this study, we investigate the characteristics of co-located
measurements of water vapour isotopes. Currently, at a tropical site in Darwin,
Australia, we obtain surface in situ H2O, H218O and HDO measurements, along
with solar absorption data allowing retrieval of column amounts of these gases. A
similar solar absorption FTS is located in the sub-tropics at Wollongong, Australia,
approximately 30km away from a instrument obtaining surface in situ measurements. We
investigate these time series for a number of properties. We first look at whether the
surface datasets are useful in determining the accuracy of column measurements
most sensitive to the surface (e.g. surface retrievals, SCIAMACHY and GOSAT
satellites retrievals). The relationship between the column measurements and surface
isotopic values is assessed under a range of atmospheric conditions, with the aim to
determine the representativity of satellite-based column measurements of surface
processes. The influence of spatial separation between surface and column data is
investigated, and finally how the combination of a co-located column and surface datasets
can help constrain modeling studies, and lead to better understanding of physical
processes. |
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