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| Titel |
Towards a new daily in-situ precipitation data set supporting parameterization of wet-deposition of CTBT relevant radionuclides |
| VerfasserIn |
A. Becker, L. Ceranna, O. Ross, U. Schneider, A. Meyer-Christoffer, M. Ziese, K. Lehner, B. Rudolf |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250069049
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| Zusammenfassung |
| As contribution to 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 (GPCC). The GPCC re-analysis and near-real time monitoring products are
recognized world-wide as the most reliable global data set on rain-gauge based (in-situ)
precipitation measurements. The GPCC Monitoring Product (Schneider et al, 2011; Becker et
al. 2012, Ziese et al, EGU2012-5442) is available two months after the fact based on the data
gathered while listening to the GTS to fetch the SYNOP and CLIMAT messages.
This product serves also the reference data to calibrate satellite based precipitation
measurements yielding the Global Precipitation Climatology Project (GPCP) data set
(Huffmann et al., 2009). The quickest GPCC product is the First Guess version of
the GPCC Monitoring Product being available already 3-5 days after the month
regarded.
Both, the GPCC and the GPCP products bear the capability to serve as data base for the
computational light-weight post processing of the wet deposition impact on the radionuclide
(RN) monitoring capability of the CTBT network (Wotawa et al., 2009) on the
regional and global scale, respectively. 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, encountered in the past, as bogus and provide an
assessment for the so far overestimation of the RN detection capability of the CTBT
network.
Besides the climatological kind of wet deposition assessment for threshold monitoring
purposes, there are also singular release events like the Fukushima accident that need to be
classified as bogus by a properly working RN verification regime. For these kinds of events a
higher temporal resolution of the precipitation data sets is needed. In course of the research
project ‘Global DAily Precipitation Analysis for the validation of medium-range
CLImate Predictions (DAPACLIP) within the Framework Research Programme
MiKlip (Mittelfristige Klimaprognose), funded by the German ministry for research
(BMBF), a new quality controlled and globally gridded daily precipitation data set is
built up, where GPCC will serve the land-surface compartment. The data set is
primarily constructed to study decadal behaviour of the essential climate variable
precipitation, but as a collateral benefit it will also serve RN verification regime
needs. The Fukushima accident has also provided impetus to construct even hourly
in-situ precipitation data sets as will be presented in the same session by Yatagai
(2012). A comprehensive overview on available precipitation data sets based on
in-situ (rain gauge), satellite measurements or the combination of both systems is
available from the International Precipitation Working Group (IPWG) web pages
(http://www.isac.cnr.it/~ipwg/data/datasets.html).
References
Becker, A., U. Schneider, A. Meyer-Christoffer, M. Ziese, P. Finger and B. Rudolf, 2012:
A description of the 1951-2000 monthly global land-surface climatology of the Global
Precipitation Climatology Centre and its derivative global products providing use
case tailored reference in-situ precipitation reanalysis data sets. In preparation for
ESSD.
Huffman, G.J, et al, 2009: Improving the Global Precipitation Record: GPCP Version 2.1.
Geophys. Res. Lett., 36,L17808, doi:10.1029/2009GL040000.
Schneider, U., A. Becker, A. Meyer-Christoffer, M. Ziese, B. Rudolf, 2011:
Global Precipitation Analysis Products of the GPCC. GPCC Internet Publication,
1-13pp.
(Available at ftp://ftp-anon.dwd.de/pub/data/gpcc/PDF/GPCC_intro_products_2008.pdf
)
Wotawa, G., Becker, A., et al, 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 and Applied Geophysics Topical
Volume 167, Numbers 4-5, 541-557
Yatagai, A., 2012: Quantitative precipitation analysis over Fukushima for understanding
the wet deposition process in March 2011. EGU2012 abstract to Session SM3.10/AS4.20 on
Nuclear Explosion Monitoring. |
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