implementation of kenda at arpa-simc and first experiences with an osse

Download Implementation of KENDA at ARPA-SIMC and first experiences with an OSSE

Post on 31-Dec-2015

21 views

Category:

Documents

0 download

Embed Size (px)

DESCRIPTION

Implementation of KENDA at ARPA-SIMC and first experiences with an OSSE. Chiara Marsigli Tiziana Paccagnella ARPA Emilia-Romagna, SIMC. Outline. Implementation of KENDA at ECMWF (sms system) Set-up of the OSSE suite First results Discussion items. KENDA suite at ECMWF. - PowerPoint PPT Presentation

TRANSCRIPT

First experiments with KENDA for providing ICs to COSMO-It-EPS

Implementation of KENDA at ARPA-SIMC and first experiences with an OSSEChiara MarsigliTiziana Paccagnella

ARPA Emilia-Romagna, SIMC

OutlineImplementation of KENDA at ECMWF (sms system)Set-up of the OSSE suiteFirst resultsDiscussion itemsKENDA suite at ECMWF

MARS retrieval of conventional observationcreation of the directoriesand set-up of the runs(ARPA) bufr2netcdfget Boundary Conditions from ECMWF ENS (and Ics for the cold start)int2lmget analysis from previous KENDA cycleCOSMO runKENDA analysis stepprocessing of outputoutput archivingcurrently 20 members3-hourly cyclesOSSE set-upNATURE RUNoptimal configuration, generates the pseudo-observations (fof files)FOFFOFFOFFOFFOFFOFFOF000306091215182124CONTROL RUNdried run, qv reduced by half in the Initial Condition10 IC original qv10 IC halved qvKENDA CYCLE

KENDA OSSE suite at ECMWFget fof from nature run (psuedo-observations)modification of the IC (like in the control run)only for members 1-10 Execution of: Nature run Control run KENDA OSSEis driven by the specification in the .def file (file for the definition of the sms suite)Set-up of the experimentsKENDA cycle: 3-hourly cycles, 24 hours20 membersBCs from ECMWF ENS (also ICs for cold start)no model perturbationsobservations: TEMP SYNOP AIREPqv lev 40-41 +3h

NATURE RUNCONTROL RUN

qv lev 40-41 +6hNATURE RUNCONTROL RUN

qv lev 40-41 +12hNATURE RUNCONTROL RUNKENDA cycle - qv lev 40-41 +3h

BACKGROUND (lff)ANALYSIS (laf)MEANSPREADKENDA cycle - qv lev 40-41 +6h

MEANSPREADBACKGROUND (lff)ANALYSIS (laf)

qv lev 40-41 +6hNATURE RUNCONTROL RUN

KENDA ANALYSISKENDA cycle - qv lev 40-41 +9hBACKGROUND (lff)ANALYSIS (laf)

MEANSPREAD

KENDA cycle - qv lev 40-41 +12hBACKGROUND (lff)ANALYSIS (laf)MEANSPREAD

qv lev 40-41 +12hNATURE RUNCONTROL RUN

KENDA ANALYSISIssues under investigationsufficient spread is needed in the OSSE ensembleafter the KENDA step: the ensemble mean is correctly driven towards the pseudo-observationsthe ensemble spread is greatly reducedpseudo-observation rejected if the spread is too smalltechincal issues to be solved related to quality control checks (pseudo-observations rejected if they are too different from the background, which may be needed for an OSSE)further testing: localisation, multi-step analysis

suggestions for this OSSE are welcome!Thank you!Heght of the levelsLevelHeight (m)Pressure (hPa)5010100040800900303000670207000400101350015012150035Test cases (Hymex SOP)I.T. ensemble runArea of the main meteorological phenomenonKENDA cycle2012092512Alps201209240020120925122012092612Liguria Tuscany201209250020120926122012101100Corse Central Italy201210100020121011002012101112Corse Central Italy201210100020121011122012102512Northern Italy (IOP16)20121024002012102512