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| Titel |
On the potential of public available gridded precipitation re-analysis and monitoring products to access the wet-deposition impact on PTS radionuclide monitoring capability |
| VerfasserIn |
Andreas Becker, Ole Ross, Lars Ceranna |
| 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 |
250056739
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| Zusammenfassung |
| Accessing global maps of the monthly detection capability of the radio-nuclide compartment
of the International Monitoring System (IMS) of the Provisional Technical Secretariat (PTS)
to the CTBTO PrepCom (http://www.ctbto.org, Wotawa et al., 2009) there is a striking
similarity in the patterns of reduced monitoring capability and the monthly averaged global
precipitation patterns. This is true; although wet deposition is not explicitly recognized in the
atmospheric transport modeling methods applied by the PTS to daily calculate the so-called
source-receptor sensitivity (SRS) fields, forming the basis for the network monitoring
capability assessments.
There is an atmospheric physics reason for this: The capability is reduced in areas of
systematically reduced surface level horizontal transport that is – due to the conservation of
mass accompanied by regions of ascending air. The uplifting of air gives rise to condensation
and formation of precipitation.
It is thus straightforward to use precipitation patterns derived from public available
re-analysis data sets as proxies to describe areas of limited detection capabilities. Moreover, if
available on a regular grid matching the aforementioned SRS fields, the precipitation data sets
could even be utilized to recognize in a computational lightweight post-processing step the
effect of wet deposition as far as the particulate radio-nuclides are concerned. This is of
major importance any time, a reliable quantitative assessment of the source-receptor
sensitivity is needed, e.g. for the analysis of isotopic ratios. Actually the wet deposition
recognition is a prerequisite if ratios of particulate and noble gas measurements come into
play. This is so far a quite unexplored field of investigation, but would alleviate the
clearance of several apparently CTBT relevant detections as bogus, encountered in the
past.
Key to the quality of any post-processing approach to describe the wet-deposition effect is
the quality of the precipitation data set utilized. Despite their striking advantages with regard
to data coverage and resolution, remote sensing based measurements of precipitation are still
subdued to significant uncertainties, in particular across the land surface, i.e. the most
likely area of investigation as far as evasive (underground) nuclear explosions are
concerned.
As part of the Global Precipitation Climatology Project of the World Climate Research
Program (WCRP) and in support of the Global Climate Observing System (GCOS) of the
World Meteorological Organization (WMO), the Deutscher Wetterdienst (DWD) operates the
Global Precipitation Climatology Centre at its Offenbach, Germany based headquarter
(http://gpcc.dwd.de). The GPCC re-analysis and near-real time monitoring products are
recognized as the most reliable global data set on rain-gauge based (in-situ) precipitation
measurements.
One of the most interesting GPCC products (Schneider et al., 2010) is surely the so-called
Monitoring Product that is realized roughly two months after the fact based on the data
gathered while listening to the GTS to fetch the SYNOP and CLIMAT messages. This
product is highly welcome to the satellite based remote sensing community to provide for a
gridded data set of highly reliable in-situ precipitation measurements to supplement their
products and to calibrate their in-direct precipitation measurements (Gruber and Levizzani,
2008, Chapter 2.2) yielding the Global Precipitation Climatology Project (GPCP) data set
(Adler et al., 1995).
Both, the GPCC and the GPCP products bear the capability to serve as data base for the
post-processing of the wet deposition impact on the radionuclide monitoring capability of the
CTBT network on the regional and global scale, respectively. The presentation will present
some example application to illustrate the potential of the GPCC and GPCP products in
CTBT context.
References
Adler, R. F., G. J. Huffman, A. Chang, R. Ferraro, P.-P. Xie, J. Janowiak, B. Rudolf, U.
Schneider, S. Curtis, D. Bolvin, A. Gruber, J. Susskind, P. Arkin and E. Nelkin, 2003: The
Version-2 Global Precipitation Climatology Project (GPCP) Monthly Precipitation analysis
(1979-present). J. Hydrometeorol., 4, 1147–1167.
Gruber, A. and V. Levizzani, 2008: Assessment of Global Precipitation, A Project of the
Global Energy and Water Cycle Experiment (GEWEX) Radiation Panel GEWEX, World
Climate Research Program, WMO, WCRP Report, May 2008, WCRP-128, WMO/TDNo. 1430;
http://www.wmo.int/pages/prog/wcrp/documents/AssessmentGlobalPrecipitationReport.pdf
Wotawa, G., Becker, A., Kalinwoski, M.B., Saey, P.J.R., Tuma, M., and Zähringer, M.,
2009: Computation and analysis of the global distribution of the Radioxenon Isotope 133Xe
based on emissions from nuclear power plants and isotope production facilities and its
relevance for the verification of the Nuclear-Test-Ban Treaty. In Recent Advances in Nuclear
Explosion Monitoring, Pure Appl. Geophys. Topical Volume (eds. Becker, A, Schurr, B.,
Kalinowski, M.B., Koch, K., Brown, D.) |
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