The development of a new lightning-frequency parameterization and its implementation in a weather prediction model (Record no. 57793)

000 -LEADER
fixed length control field 03173nam a2200253Mi 4500
001 - CONTROL NUMBER
control field ocn650811580
003 - CONTROL NUMBER IDENTIFIER
control field OCoLC
005 - DATE AND TIME OF LATEST TRANSACTION
control field 20140325095217.0
008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION
fixed length control field 100723s2010 gw m 000 0 eng d
035 ## - SYSTEM CONTROL NUMBER
System control number (OCoLC)650811580
040 ## - CATALOGING SOURCE
Original cataloging agency GyFmHBV
Language of cataloging ger
Transcribing agency HEBIS
049 ## - LOCAL HOLDINGS (OCLC)
Holding library CNRM
090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN)
Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) 101945
100 1# - MAIN ENTRY--PERSONAL NAME
Personal name Dahl, Johannes M. L.
Relator code aut
9 (RLIN) 118
245 04 - TITLE STATEMENT
Title The development of a new lightning-frequency parameterization and its implementation in a weather prediction model
Statement of responsibility, etc. Johannes M. L. Dahl.
260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT)
Place of publication, distribution, etc. Köln
Name of publisher, distributor, etc. DLR, Bibliotheks- und Informationswesen
Date of publication, distribution, etc. 2010.
300 ## - PHYSICAL DESCRIPTION
Extent III, 149 S.
Other physical details graph. Darst.
490 1# - SERIES STATEMENT
Series statement Forschungsbericht
502 ## - DISSERTATION NOTE
Dissertation note Univ., Diss., 2010--München.
520 8# - SUMMARY, ETC.
Summary, etc. Based on a straightforward physical model, a new lightning parameterization has been developed: A two-plate capacitor represents the basic dipole charge structure of a thunderstorm, which is charged by the generator current and discharged by lightning. In this approach, the generator current as well as the discharge strength are parameterized using the graupel-mass field. If these two quantities are known, and if the charging and discharging are in equilibrium, then the flash rate is uniquely determined. This approach remedies shortcomings of earlier theoretical approaches that relate the flash rate e.g., to generator power. No distinction is made between intracloud and cloud-to-ground discharges. In order to test this approach, polarimetric radar data were used, from which the graupel distribution in observed thunderstorms could be inferred. The lightning activity was detected using the LINET network. The comparison between theoretically-predicted and measured flash rates is encouraging: Over a wide range of flash rates, the theoretical approach yields accurate results for isolated thunderstorms. Two existing parameterizations, which only use the depth of the clouds as predictor, produce substantially less accurate forecasts. These two existing approaches, the one developed in this study, as well as a fourth one based on updraft velocity, were implemented in the convection-resolving COSMO-DE numerical weather prediction model. With this model, real-world convective scenarios were simulated. The output of the lightning scheme includes the location and time of every simulated discharge. Testing the performance of the parameterizations with modeled convection is difficult as there is no one-to-one correspondence between observed and modeled convective clouds. Where a comparison between modeled and observed flash rates of individual clouds was possible, the results for individual cells were promising. The comparison of the bulk lightning activity over an area comprising southern Germany and adjacent countries suggests that none of the four parameterizations captures the overall lightning activity well. This is mainly because COSMO-DE does not simulate the observed number of cells at the correct times.
810 2# - SERIES ADDED ENTRY--CORPORATE NAME
Corporate name or jurisdiction name as entry element Deutsches Zentrum für Luft- und Raumfahrt
Volume/sequential designation 2010,11.
9 (RLIN) 116
810 2# - SERIES ADDED ENTRY--CORPORATE NAME
Corporate name or jurisdiction name as entry element Deutsches Zentrum für Luft- und Raumfahrt
Title of a work Forschungsbericht
Volume/sequential designation 2010,11.
9 (RLIN) 117
856 41 - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier http://www.estofex.org/files/dahl_phd.pdf
Holdings
Withdrawn status Lost status Source of classification or shelving scheme Damaged status Not for loan Permanent Location Current Location Shelving location Date acquired Full call number Barcode Date last seen Copy number Uniform Resource Identifier Price effective from Koha item type
          NCAR Library NCAR Library Mesa Lab 2010-11-08 101945 50583010336166 2012-07-17 1 http://www.estofex.org/files/dahl_phd.pdf 2010-11-08 REPORT

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