The New Nature Run and International Collaborations in OSSEs

1
The New Nature Run and International
Collaborations in OSSEs
Nature Run Serves as a true atmosphere for
OSSEs Preparation of the nature run consumes a
significant amount of resources. If different NRs
are used the results can not be compared. Many
nature runs will delay the delivery of the OSSE
results.
OSSEs are a very labor intensive project.

• Need one or two new good nature runs which will
  be used by many OSSEs.
• Share the simulated data,
• compare the results.

• Forecast runs forced by daily SST and ICE will be
  used for the Nature run.
• Analysis is forced by observation and has jump in
  time evolution
• Analysis is affected by the data assimilation
  scheme
• Forecast run allows frequent sampling
• Analysis lacks the dynamical consistency

2
New Nature Run by ECMWF Based on
Recommendations by JCSDA, NCEP, GMAO, GLA, SIVO,
SWA, NESDIS, ESRL
Low resolution Nature Run Spectral resolution
T511 Vertical level L91 3 hourly dump Model
IFS cycle 31r1 Daily SST and ICE (Provided by
NCEP) Period May 1, 2005- May 30, 2006
The simulation of the observation must be done
from model levels and full resolution. Low
resolution pressure and isentropic level data
will be available for diagnostics and evaluation.
To be archived in the MARS system on the THORPEX
server at ECMWF Accessed by external users Copies
in US for designated users (at NCEP NASA/GSFC,
ESRL. SWA )
A large number of standard diagnostic plots have
been produced with the 'climplot' software by
Adrian Tompkins at ECMWF. Cyclone track
diagnostics is produced by Thomas Jung of ECMWF.
High resolution Nature run for selected
period T799 resolution, 91 levels, one hourly
dump Get initial condition from L-NR one six
week periods
3

• Data distribution
• The complete data set sent to NCEP and copied to
  ESRL and NASA/GSFC.
• B. Sample pressure level is posted at Nature run
  web site.
• User lists for each data sets are
  maintained by Michiko Masutani. Contact POC for
  your institute and provide all users Name,
  affiliation and E-mail address to Michiko to use
  above data set.

Contacts for the New Nature Run ECMWF Erik
Andersson NCEP Michiko Masutani NASA/GSFC
Lars-Peter Riishojgaard(GMAO), Oreste
Reale(GLA), Joe Terry (SIVO) JCSDA John
LeMarshall NESDIS Thomas J. Kleespies SWA
Steven Greco ESRL Tom Schlatter Air
Force Daniel Pawlak THORPEX Pierre
Gauthier(DAOS) , David Person(USA) Zoltan Toth
(GIFS) Met Office Richard Swinbank Meteo France
Jean Pailleux KNMI Gert-Jan
Marseille JMA Munehiko Yamaguchi, Kozo
Okamoto MRI Tetsuo Nakazawa ES Takeshi
Enomoto EUMETSAT Jo Schmetz ESA Eva
Oriol
Extended international collaboration within
Meteorological community is essential for timely
and reliable OSSEs JCSDA , NCEP, NESDIS,NASA,
ESRL ECMWF, ESA, EUMETSAT THORPEX,
IPO Operational Test Center OTC Joint
THORPEX/JCSDA