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GODAE OceanView Observing system Evaluation Task Team Report

Peter OkePeter Oke11 and Gilles Larnicol and Gilles Larnicol22

1CSIRO Marine and Atmospheric Research; 2CLSNovember 2011

“The most exciting phrase to hear in science, the one that heralds the most discoveries, is not ‘Eureka!’, but ‘That’s funny…’ ”, Isaac Asimov (1920-1992)

www.cmar.csiro.au/staff/oke/

GOV OSEVal-TT organisation

Co-Chairs: Peter Oke (CSIRO)Gilles Larnicol (CLS)

Core Members: Magdalena Balmaseda (ECMWF)Laurent Bertino (NERSC)Gary Brassington (BoM)Jim Cummings (NRL)Yosuke Fujii (JMA/MRI)Pat Hogan (NRL)Villy Kourafalou (Univ. Miami)Daniel Lea (UKMet)Matthew Martin (UKMet)Avichal Mehra (NOAA)Pavel Sakov (NERSC)Anthony Weaver (CERFACS)

Associate members:Mike Bell (UKMet)Eric Dombrowsky (Mercator)Fabrice Hernandez (Mercator)Eric Lindstrom (NASA)Andreas Schiller (CSIRO)


Observing System Evaluation Task Team (OSEval-TT)

Routine Monitoring

of the GOOS

Routine Monitoring

of the GOOS

Delayed-mode OSEs and OSSEs

for short-range and seasonal forecast

systems



systems

Design and evaluation of new

and future observation system

components



components

Provision and management of

Observation Impact Statements (OIS)

based on OSEval evidence




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Framework for Ocean Observing:where GODAE OceanView fits

Contributed by E. Lindstrom, OOPC Chair, NASA

GOV OSEva

l-TT

GO

DAE

O

cean

View

GO

DAE

O

cean

View



Routine Monitoring

of the GOOS

Routine Monitoring

of the GOOS



systems



systems



components



components







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Capability building:GODAE and GOV OSEval Workshops

• 1st GODAE OSE/OSSE workshop (November 2007, UNESCO, Paris)

OSEval-TT established

• 2nd GOV OSEVal-TT workshop (June 2009, CLS, Toulouse) Initiation of Routine Monitoring activitiesOSEval-TT work plan (draft)

• GODAE OceanView and CLIVAR GSOP workshop on Observing System Evaluation and Inter-comparisons (June 2011, Santa Cruz, CA, USA)

Extension and expansion of NRT OSEs (3 groups plan to participate; others may participate)

Concept of “Observation Impact Statement” introduced



Routine Monitoring

of the GOOS

Routine Monitoring

of the GOOS



systems



systems



components



components







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Example of an OSE (with-holding XBT)

OSEs using HYCOM after the DWH Oil spill to assess the impact of XBT data

Halliwell et al. (NRL & NOAA)

www.cmar.csiro.au/staff/oke/ Contributed by G. Halliwell, NOAA/AOML/PhOD


Impact of P-3 Observations on Ocean Analyses

• Collaboration between AOML and NRL-Stennis– NRL ran two experiments with the 1/25° regional HYCOM:

1. Assimilate all observations

2. Deny only the P3 observations

• Critical issues affecting this evaluation:– Results depend on choices of model and DA scheme– Impact of update cycle– Impact of relative weighting of synthetic T,S profiles derived from altimetry

vs. in-situ T,S profiles

Contributed by G. Halliwell, NOAA/AOML/PhOD


RED: With P3 assimilation

BLACK: No P3 assimilation


No assimilation ~ 4-5 degrees

No assimilation < 0.5

No assimilation +- 1 degree


Experiment Bias (°C) RMS Diff. (°C)

Skill Score

P-3 Profiles Assimilated

-1.11 1.41 0.88

P-3 Profiles Denied

-1.18 1.79 0.84

No Data Assimilation

-0.40 4.5 0.31

Error Analysis, Nancy Foster T Profiles, 9 July

Experiment Bias (°C) RMS Diff. (m)

Skill Score

P-3 Profiles Assimilated

-21.1 35.8 0.09

P-3 Profiles Denied

-24.3 44.3 < 0

No Data Assimilation

19.3 89.5 < 0

20°C isotherm depth

Temperature, 30 – 360 m


8-10 July


Oke, P., and P. Sakov: Design and Assessment of the Australian Integrated Marine Observing System

Simple method to assess the potential impact of data from moorings


Footprint of individual moorings

Cabbage Patch Mooring

Deep Slope Mooring


Footprint of individual moorings


SA-IMOS regional moorings array

Intraseasonal SSH

Intraseasonal SSV


Combined “footprint” for NRSs on interannual time-scales

MODEL Observations

SSH

SST


Delayed-mode OSEs and design experiments

Many examples of research in this area at the GODAE OceanView – CLIVAR GSOP workshop

… refer to GOV-CLIVAR WS report



Routine Monitoring

of the GOOS

Routine Monitoring

of the GOOS



systems



systems



components



components







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Responses to “observing system events”

Continuation of Jason-1 data processing in inter-leaved orbit (June 2009)

UKMet and BoM provided a demonstration of the impact of Jason-1 data in inter-leaved orbit during recent outages

Contributed by G. Brassington, BoM


NRT OSEs Routinely run parallel forecast at operational centers and

with-hold a different data each month:

Quantify the impact of each data type on forecasts Multi-system approach

Feb 2011Mar 2011Apr 2011May 2011Jun 2011Jul 2011

XBTTAOJason-2All altimsSSTArgo


SSTArgoXBTTAOJason-2All altims


NRT OSEs Routinely run parallel forecast at operational centers and

with-hold a different data each month:

Quantify the impact of each data type on forecasts Multi-system approach


XBTTAOJason-2All altimsSSTArgo

Feb 2012Apr 2012Jun 2012Aug 2012Oct 2012Dec 2013

SSTArgoXBTTAOJason-2All altims



Routine Monitoring

of the GOOS

Routine Monitoring

of the GOOS



systems



systems



components



components







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Provision of Observation Impact Statements (OISs)

24


Provision of Observation Impact Statements (OISs)


Summary

OSEval-TT Work plan completed (but living ) GODAE OceanView OSEval-TT are committed to supporting

observation agencies/teams in demonstrating the impact of observations on forecast and analysis products

Many groups are undertaking research activities Recent initiatives have motivated many developments at operational

centers :DFS, analysis sensitivity, forecast sensitivity

The OSEval-TT proposed the idea of NRT OSEs; and are promoting the idea of Observation Impact Statements (OISs) (fom C. Conlon)

Details of schedule, reporting, dissemination and engagement with GOV Patrons will be refined offline

Considering review article of OSEval achievements (expand on Oceanography special issue)

Resources for OSE / IV work ???

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