uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old September 2nd 09, 04:06 PM posted to uk.sci.weather
external usenet poster
 
First recorded activity by Weather-Banter: Dec 2004
Posts: 4,411
Default Schucks missed another good one.

NRL SEMINAR
3:00 PM, Tuesday, 8 September 2009
Advanced and High-resolution Data Assimilation Techniques
Andrew Lorenc
MET Office,
Exeter, Devon, United Kingdom

The review intends to shed light on possible strategies for the
convective scales data assimilation (DA) of clouds and
precipitations.

Operational schemes are often based on quasi-linear optimal estimation
theory, and use the variational technique (e.g. 3DVar/4DVar) to cope
with the minimization problem. The review will try to figure out
possibilities and limitations of the seamless extension of such
schemes to higher resolution (Lorenc and Payne, 2007) and cloud
analysis (Errico et al, 2007).

Another method of solving the quasi-linear estimation problem is to
discretize it with ensembles, (through the various forms of Ensemble
Kalman Filters (EnKF).)

Several reviews have already considered the EnKF vs. 4D-Var approaches
(Dance, 2004), so we suggest the review may focus on hybrid strategies
(1DVAR+4DVAR, VAR+EnKF, Lognormal+Gaussian DA systems) in conjunction
with cloud VAR+analysis.

At those scales and for the hydrometeors, non-linearity becomes a
significant issue. It may first appear as a displacement error,
requiring some specific DA schemes, such as Beezley and Mandel (2008).
The review may also give some clues about the notion of fronts and
vertical/horizontal displacement errors in clouds and the way
alternative DA scheme could be designed to solve such problems.


Just as well reallly as I usually rely on online dictionaries these
days and I doubt very much it would be worth carrying my desktop
through US customs. They thayer baying so quaint ayun all.

Errmm.. wots an hydrometeor?

Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
WR&OBS Copley 3/7 another good one Ken Cook uk.sci.weather (UK Weather) 0 July 3rd 11 09:55 AM
How odd that NO.ZOB missed this one Fran[_2_] sci.geo.meteorology (Meteorology) 0 July 29th 08 09:31 AM
[WR] Whistlefield, 6.05.2008 : Another Good One. Alan White uk.sci.weather (UK Weather) 1 May 6th 08 06:28 PM
Surprisingly good Monday and less good Tuesday [email protected] uk.sci.weather (UK Weather) 3 June 14th 05 10:30 PM
good june does not mean good july Graham Davis uk.sci.weather (UK Weather) 0 July 3rd 03 09:55 PM


All times are GMT. The time now is 08:05 PM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 Weather Banter.
The comments are property of their posters.
 

About Us

"It's about Weather"

 

Copyright © 2017