Summary of OSSE meeting on April 10, 2008 and progress

 080529   Draft

 

April 10, 2008

Attendee

Chris Hill (MSU), Lars-Peter Riishojgaard, Jack Woollen, Tong Zhu, Haibin Sun, Yucheng Son, Michiko

 

Telecom

Ron Errico (GMAO)

Tom Schlatter, Yuanfu Xie,  Nikki Prive  (ESRL)

Pat Fitzpatrick, Valentine Anantharaj (MSU)

Place:   WWB Rm 209

Presentations are  posted at:

http://www.emc.ncep.noaa.gov/research/JointOSSEs/NR/Apr08/

 

Tuesday April 8, 2008

Attendee:  Val Anantharaj , Chris  Hill , Lars-Peter Riishojgaard, Fuzhon Weng,  Jack Woollen, Tong Zhu, Haibin Sun,  Michiko Masutani

Discussion about meso scale OSSE at MSU.  Summary will be prepared by Chris.

 

         

 

Agenda at the meeting on 4/10/08

1.  Over view of the progress and related activities

2.  Progress in simulation of radiance

3.  Discussion on plan and coordination with regional OSSE at MSU

 Highlights in Progress

            1.  GMAO OSSEs in Presentation JCSDA seminar

            2.  JMA started working on LETKF

            3.  Discussion about simulation of DWL (Summarized in separate note)

ADM_Aeolus-simulation_080519.doc 

            4.  Discussion about simulation of radiance  (Summarized in separate note)

Draft  of summary  Simulation_Radiance_draft_080526.doc

            5.  OSSE chart by Tom Schlatter

                        TWS_GlobalOSSEFlow.1.ppt

            6.  Nature run data at NASA at portal and also gradsdods by Arlindo

                        NASA_Portal_T511_reorganized.080527.draft.doc

            7.  Further diagnostics of   evaluation of T799 NR

            8.  Detail planning  for OSSE at MSU

            9.  Presentation at EGU and  two preprint for ILRC

            10.  Parallel script for Joint OSSE is assembled by Yucheng

            11:  EMC seminar on April 1

                        http://www.emc.ncep.noaa.gov/seminars/presentations/2008/JointOSSEs/

 

[Summary of the meeting]

1   Over view of the progress and related activities

      Summaries of meeting in Janurary and February, materials are posted at

http://www.emc.ncep.noaa.gov/research/JointOSSEs/NR/Jan-Mar08

            Meeting summary

mtg.080110.080221.summary.fnl.doc

 

2. Simulation of radiance (Detail is summaized in attached note)

 

Ron Errico summarized the progress in simulation of radiance at GMAO.

Thinning and sampling strategies was not clear.  It will be summarized in attached note on simulation of radiance.

Ron Errico wants to deliver simulated radiance with codes after calibration has completed.   

This is not acceptable to NOAA and JCSDA

 

Discussion at OSSE meeting on April 10, 2008 and follow up

 

GMAO is simulating Satellite data used in gdas for  Nature run period with same thinning  (every other golf ball).

 

Ron will write documentation as well as comments in code.  Codes will be available to Joint OSSE team.

 

Vertically correlated error and random observational error based on error table is added. 

 

Radiance data with and without obs error will be provided.

 

Tuning at GMAO will be done using adjoint technique.   The radiance data will be released after tuning around end of summer.

 

NOAA need radiance data for precursor run and tuning can be done at NOAA as well.  It will take time to set up.   Tuning can be done by NOAA as well as GMAO

 

Michiko said we can wait for data which Ron feels comfortable.  He has clear scientific idea  we should respect.

 

NOAA effort to simulate radiance data at thinned foot prints.

Jack will produce 91 level profile at foot print used by operational GDAS.  The data include information required for simulation of radiances.

Tong produced GOES and AMSU.  Haibing may produce HIRS.   Jack is working on Buffering.

 

This data will help to keep cycle going and we have to prepare for radiation data from GMAO.

 

 

 

 

 

 

3.  Discussion on Meso scale OSSE

 MSU_2008Apr_OSSE-plan.080410.ppt

 

Summary of discussion on April 8 and 10th regarding MSU OSSE will be prepared by Chris Hill.

 

MSU has plan for OSSE to evaluate CrIS and ATMS using regional OSSE. 

 

Micth prefer giving away soft ware but Fuzhong wants simulation to be done under his supervision.  Releasing software may not be easy. 

 

Mitch's group is making CrIS like data from IASI but Lars-Peter think that is not easy task and much easier to do OSSE once CRTM have CrIS capability.   They will meet to discuss about this issue.

 

 

Satellite community think high resolution model such as 4km resolution is required for 1km data.  There is no data assimilation for 4km model at NCEP.  Most of the regional experiments are performed coarser than 12km and even 60km.  We are not sure if there is any demonstrated advantage 4km resolution model.  

 

There is a discussion about lateral boundary condition for regional OSSEs.  NR itself can be used as boundary condition but that will give too optimistic.   Doble nesting to putturb BC is suggested . Tom  said perform global OSSE first to feed the lateral BC regional OSSEs.   Jack was not convinced that not convinced regional OSSE has to wait to for global OSSE.

 

We also discuss if case study is good enough to evaluate data impact.

           

Lars-Peter said that there are large demands for impact study of HESS.  Only regional OSSE can handle high resolution data.    We cannot wait for global meso scale model.

 

 

[Progress]

1. Michele Rienecker presented JCSDA seminar on April 16.  

http://www.star.nesdis.noaa.gov/jcsda/documents/seminardocs/GMAO_JCSDA_20080416.pdf

 

In her presentation OSSE at GMAO was summarized.

 

Main participants of OSSE at GMAO are Ron Errico, Runhua Yang, Emily Liu, Arlindo da Silva, Joanna Joiner, Meta Sienkiewicz

 

Design of an Observation System Simulation Experiment

GMAO is trying to have a complete OSSE Capability within

 

Arlindo DaSilva and Math McGill are working on simulating DWL from NASA/GSFC.  DWL data are simulated as back scatter.

 

From the presentation

 

Goals: Capability at the GMAO

 

1. Estimate the effect of proposed instruments on analysis and forecast skill by “flying” them in a simulated environment.

2. Evaluate present and proposed data assimilation techniques in a simulation where “truth” is known perfectly.

 

Requirement

1. A self-consistent and realistic simulation of nature - provided to the community by ECMWF through NCEP.

2. Simulation of all presently-utilized observations, derived from the “nature run” and having simulated instrument plus representativeness errors characteristic of real observations.

3. A validated baseline assimilation of the simulated data that, for various relevant statistics, produces values similar to corresponding ones in a real DAS.

 

The OSSE Design Plan at the GMAO

A phased approach:

1. Phase one: use a simple approach to produce a significantly more realistic baseline than has been done to date using all observation types currently demonstrated to have significant impacts (rather than attempting to simulate all observations as realistically as possible).

2. Use the adjoint of the GEOS-5 DAS to determine separate impacts of all the simulated observation types for comparison with corresponding impacts in a real DAS.

3. Later phases: add more instruments to the baseline and attempt to

provide more realism to the simulated characteristics of observation and representativeness errors.

 

 

This is currently a small effort within the GMAO that we hope to grow.

 

2   OSSE at JMA

 

Takamasa Miyoshi and Takeshi Enomoto started working on simulation of conventional data using LETKF.

 

They have a little trouble in reading NCEP bufr code but managed to read with help from Jack. 

Note the data is written in "big endian" and there is a software to convert to "little endian". 

 

3.  Simulation of DWL

Summary of E-mail exchange is summarised in  

ADM_Aeolus-simulation_080519.doc

 

A) Most of major operational centers are expected to assimilate L1B data and I think we agreed that it is very important that L1B data is simulated.  So we can test complete DAS cycle in OSSE before the launch.  However, L1B simulator is not quite ready. 

 

B) There are more than objective to simulate DWL data

DWL data can be simulated as back scatter, L1B or L2B.  The choice will depends on the objective of experiments.

(1) Data impact study to test and select future systems

(2) Simulate ADM-Aeolus data to get assimilation system ready before the launch

(3)Understand the characteristics of the DWL data.  (Back Scatter will be simulated)

 

 

C) We have to coordinate KNMI, SWA and NASA

GMAO will simulate 18 types of aerosol for T511 NR  which may affect DWL sampling.  The simulated aerosol will be posted from NASA portal.  These data may be useful to KNMI and SWA.

 

D)Preparation data assimilation systems for ADM-Aeolus

 

Dave Emmitt of SWA said that SWA will simulate ADM if KNMI is not funded to simulate.  They have received all information need to simulate ADM from ESA.   SWA does not have any model level data, yet.  The data transfer has been the problem for SWA.  However, new linux machine and 8 processor Mac computer at SWA might help speed up the computation at SWA.

 

4.  Simulation of Radiance

 

Draft  of summary  Simulation_Radiance_draft_080526.doc can be found in

http://www.emc.ncep.noaa.gov/research/JointOSSEs/forums

There is no link, yet.

 

5.  OSSE chart by Tom Schlatter

http://www.emc.ncep.noaa.gov/research/JointOSSEs/NR/Apr08/

                        TWS_GlobalOSSEFlow.1.ppt

6.  Nature run data at NASA at portal and also gradsdods by Arlindo

                       

                        http://www.emc.ncep.noaa.gov/research/JointOSSEs/data

                        NASA_Portal_T511_reorganized.080527.draft.doc

7.  Further diagnostics of   evaluation of T799 NR

Michiko found surface temerature at both pole are getting cold.  After one month T799 NR is 10 degree colder than T511 NR.

8.  Detail planning  for OSSE at MSU

            Detail plan for OSSE at MSU is discussed.

            Working on coordination with CRTM development and NESDIS

            Detail summary will be produced by MSU

9.  Presentation at EGU and  two preprint for ILRC

10.  Parallel script for Joint OSSE is assembled by Yucheng

            Moorthis and Diane are working on parallel scripts.  However, it is taking long time and that would include what we do not need, such as coupling with ocean model.  Yucheng spearhead and spent some time to put together parallel script which OSSE can use.  This will speed up calibration at NCEP and ESRL.  We like to thank to Yucheng.