Bern 6-7 October 2003

COST Action #723

COST WG2

WG2: “An assimilated Ozone andHumidity Dataset”

W.A. LahozDARC, Reading, UK

http://darc.nerc.ac.uk

Thanks to Alan Geer & Mike Keil for plots

Bern 6-7 October 2003

COST Action #723

COST WG2

• Aims (WG2)• Participants• Workplan• Deliverables• Timetable• Examples (assimilation/evaluation/synergy/QC-

datasets)• Future work

COST Action plan

Bern 6-7 October 2003

COST Action #723

COST WG2

AIMS (WG2):• Algorithms to assimilate UTLS datasets into

troposphere/stratosphere GCMs & CTMs

• QC-datasets of UTLS O3 & H2O for use by scientific community

• Assess state of UTLS & understand processes, using data (assimilation analyses, …)

• Information -> comprehensive analysis of anthropogenic impact on UTLS region

Bern 6-7 October 2003

COST Action #723

COST WG2

EXAMPLES

Bern 6-7 October 2003

COST Action #723

COST WG2

DARC

Bern 6-7 October 2003

COST Action #723

Self-consistency• MIPAS ozone O-A 22 –29 Sep 2002 global mean on pressure levels

• MIPAS biased high wrt analyses @ 1.6hPa

• Evidence of spin-up ~9 hPa

COST WG2

Bern 6-7 October 2003

COST Action #723

Self-consistencyMIPAS ozone O-B22 –29 Sep 2002

global mean

Gaussian curve

bias

COST WG2

Bern 6-7 October 2003

COST Action #723

COST WG2

Nadir/limb synergy (see Struthers et al. JGR 2002)

•Assimilation of MLS ozone (limb) & GOME total ozone (nadir)

•Ozone analyses using both geometries are objectively “better” (more consistent with a BLUE) than those using just one or other of the geometries

Bern 6-7 October 2003

COST Action #723

QC-dataset

Ozone analyses

at 10hPa

Sep 2002 SH

Bern 6-7 October 2003

COST Action #723

COST WG2

KNMI

Bern 6-7 October 2003

COST Action #723

COST WG2

Evaluation vsindependent dataLindenberg (52N, 14E; 19/04/00)Blue: Fortuin-Kelder climatologyGreen: OzonesondeRed: O3 profile from KNMI GOME

ozone column assimilationMagenta: O3 profile from KNMI

GOME ozone profile assimilation

Henk Eskes & Arjo Segers, KNMI

Bern 6-7 October 2003

COST Action #723

QC-dataset

GOME Total ozone assimilated 7-yr dataset:

GOA

www.knmi.nl/goa

Henk Eskes &

Arjo Segers

KNMI

Bern 6-7 October 2003

COST Action #723

A. Sci. CZ/Obs. Bordeaux

COST WG2

Bern 6-7 October 2003

COST Action #723

J. Heyrovský Institute of Physical Chemistry, Academy

of Sciences of the Czech Republic, Prague

Observatoire Aquitain des Sciences de l’Univers,

Laboratoire d’Astrodynamique, d’Astronomie et d’Aéronomie

de Bordeaux

Co-operation:

•Odin observations for analyses of H2O,O3 & other species (e.g. H2CO, CF2O,HCN,…) -> information on concentrations

•Above species are key for atmospheric photochemistry-> datasets for assimilation into photochemical models & evaluation

•Analyses complemented by lab studies of line shapes of H2O, O3 & other species

Bern 6-7 October 2003

COST Action #723

Obs. Bordeaux

COST WG2

Bern 6-7 October 2003

COST Action #723

COST WG2

N2O from ODIN/SMR

Assimilated into MSDOL

55 hPa Sep 2002 SH

Laaziz EL Amraoui &

Philippe Ricaud

Obs. Bordeaux

Bern 6-7 October 2003

COST Action #723

COST WG2

FUTURE WORK:

• Studies of Sep SH 2002 & other periods• Assimilation of H2O data (errors)• Assimilation of ODIN (ongoing), GOMOS (started),

SCIAMACHY,…• H2O QC-datasets• Radiance assimilation• Studies with data from future missions (Eos Aura,

…)

Bern 6-7 October 2003

COST Action #723

COST WG2

EXTRA MATERIAL

Bern 6-7 October 2003

COST Action #723

COST WG2

AIMS (WG2):

• Develop algorithms to assimilate an increasing variety of UTLS datasets into GCMs & CTMs that encompass troposphere & stratosphere

• Provide quality-controlled assimilated datasets of UTLS O3 & H2O for use by scientific community

• Assess state of UTLS & understand processes, using assimilated data & other data records

• Use collected information to give a comprehensive analysis of anthropogenic impact on UTLS region

Bern 6-7 October 2003

COST Action #723

COST WG2

PARTICIPANTS:

• DARC, University of Reading, UK (W. Lahoz)• KNMI, The Netherlands (P. Siegmund, H. Kelder)• U. Köln, Germany (H. Elbern)• Bordeaux Observatory, France (J. Urban, P. Ricaud)• CNR, Rome, Italy (F. Fierli)• Academy of Sciences, Czech Republic (Z. Zelinger)• Others…

Bern 6-7 October 2003

COST Action #723

COST WG2WORKPLAN:

• Algorithms to assimilate research satellite data in UTLS

• Assimilation* of L2 data (T, O3, H2O,…) into GCMs & CTMs

• Evaluation* of models & observations (assimilation,…)

• Evaluation of key parameters in UTLS

• Synergy*: limb/nadir geometries,…

• QC-datasets* (+metadata) in UTLS (T, O3, H2O)

Bern 6-7 October 2003

COST Action #723

COST WG2WORKPLAN (1):

• Algorithms to assimilate research satellite data (e.g., GOME, ODIN, Envisat) into GCMs & CTMs

• Assimilation of retrieved research satellite data (troposphere, temperature, O3, H2O, NO2, N2O, ClO) into GCMs & CTMs

• Evaluation of assimilation algorithm, model, & retrieval parameters

• Evaluation of existing & future UTLS datasets: (i) assimilation, (ii) comparison between assimilated datasets, (iii) comparison between constrained & non-constrained model datasets, and (iv) comparison with independent data

Bern 6-7 October 2003

COST Action #723

COST WG2WORKPLAN (2):

• Evaluation of key parameters in UTLS to study (i) dynamics, (ii) chemistry, & (iii) climate

• Evaluation of merit of combining limb & nadir geometries using, e.g., measurement techniques, assimilation studies

• Production of quality controlled datasets in UTLS including documentation: (i) temperature, (ii) O3, & (iii) H2O

• Assimilation of limb radiances into GCMs & CTMs

Bern 6-7 October 2003

COST Action #723

COST WG2DELIVERABLES:

• Algorithms to assimilate data into GCMs & CTMs

• Report/evaluation on UTLS assimilated datasets

• Report on UTLS: (i) dynamics, (ii) chemistry, & (iii) climate • Report on synergies: nadir/limb,…

• QC-datasets (+metadata) in UTLS (T, O3, H2O)

• Report on assimilation of limb radiances into GCMs & CTMs

Bern 6-7 October 2003

COST Action #723

COST WG2DELIVERABLES (1):

• Algorithms to assimilate research satellite into GCMs & CTMs

• Report on available UTLS assimilated datasets including evaluation of data quality, documentation & contact points

• Report on key parameters in UTLS to study (i) dynamics, (ii) chemistry, & (iii) climate

Bern 6-7 October 2003

COST Action #723

COST WG2DELIVERABLES (2):

• Report on merit of combining limb and nadir geometries using, e.g., measurement techniques, assimilation studies

• Quality controlled datasets in UTLS including documentation: (i) temperature, (ii) ozone, and (iii) water vapour

• Report on assimilation of limb radiances into GCMs and CTMs

Bern 6-7 October 2003

COST Action #723

COST WG2TIMETABLE:

• Summary progress reports for WG2 (Months 12, 24, 36, 48)

• Report of algorithms (Month 48)

• Quality –controlled datasets (Month 48)

• Preliminary studies on radiances (Month 48)

Bern 6-7 October 2003

COST Action #723

COST WG2

Unassimilateddata• MLS O3 data

• 10 hPa• 1 Feb 1997• Blue (low)• Red (high)

Bern 6-7 October 2003

COST Action #723

COST WG2

Assimilated data

• O3 analysis 12 GMT

• Met Office AC scheme• Operational data + MLS T + MLS O3

• 10 hPa• 1 Feb 1997• Blue (low)• Red (high)

Bern 6-7 October 2003

COST Action #723

COST WG2

Evaluation vsindependent data• a)-d) Ozonesonde comparisons• Line: Ozonesonde• Stars: Analyses (MLS+GOME)• Diamonds: Initial data (Fortuin+ Kelder Climatology)

Bern 6-7 October 2003

COST Action #723

COST WG2

Evaluation vsindependent data• HALOE Comparisons• 3 week average• MLS+GOME analyses• Line: O-A• Dashed line: 1 error

Bern 6-7 October 2003

COST Action #723

COST WG2

Evaluation vsindependent data• TOMS Comparison• 3 week average• MLS+GOME analyses• Line: O-A• Dashed line: 1 error

Bern 6-7 October 2003

COST Action #723

COST WG2

Nadir/limb synergy (see Struthers et al. JGR 2002)

a) MLS only, b) GOME Only, c) MLS+GOME

O-A rms: straight line (O is MLS)

MLS error: dashed line

Bern 6-7 October 2003

COST Action #723

COST WG2

Nadir/limb synergya) MLS only,b) GOME only,c) MLS+GOMEO-A rms: straight line(O is GOME)GOME error: dashed line

Bern 6-7 October 2003

COST Action #723

Participation on analyses of averaged spectra - detection and identification of very weak lines:

global averages of spectra pre-selected bandwidths

residuals for different bands: ymeas - y(x)R.T.Moliere weak + unknown

lines

H2O2, HO2 ?

special interest - the chemistry and photo-physics of FC(O)Ox radicals - a likely product of the photo-dissociation of CF2O and CFClO, in 1989

concentration estimate of CF2O 1.4 x 1014 molecule cm-3 (18 km), increase by 10 % each year

J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the

Czech Republic, Prague

Observatoire Aquitain des Sciences de l’Univers, Laboratoire

d’Astrodynamique, d’Astronomie et d’Aéronomie de Bordeaux

Starting points of cooperation between:

Bern 6-7 October 2003

COST Action #723

Laboratory

• Line shape, broadening, intensities, rate constants, branching ratios

• IR region and MW region with the help of FTIR spectrometer, IR diode lasers, MW sources

• H2CO broadening not measured yet in IR and mm region, N2O, CH3CN (+STEAM), CF2O, CH3Cl, CH3Br if appear in averaged spectra

Interpretation

• the chemistry and photophysics of FC(O)Ox radicals is not well understood part of the chemistry of the stratosphere - precursor CF2O

• HCN model deficit, role of CH3CN

• influence and reactions of CH3Cl, CH3Br, role of radicals CH2Cl, CH2Br

Bern 6-7 October 2003

COST Action #723

B: STD RH (%)

December

New Dynamics50 levels0-63 km

NMC Method

Bern 6-7 October 2003

COST Action #723

B: RH correlations, December.

New Dynamics: NMC Method

16 km 19.7 km

Bern 6-7 October 2003

COST Action #723

COST WG2

BENEFICIARIES OF COST ACTION• EO Community (end users)• Weather Agencies• Space agencies• Instrument builders• Climate Modellers• Policy makers