ESTEC 11-13 March 2004 COST Action #723 WG2 OVERVIEW “An assimilated Ozone and Humidity Dataset” W.A. Lahoz DARC, Reading, UK http://darc.nerc.ac.uk Thanks to Alan Geer & Dominique Fonteyn
Jan 21, 2016
ESTEC 11-13 March 2004
COST Action #723
WG2 OVERVIEW “An assimilated Ozone and
Humidity Dataset”
W.A. LahozDARC, Reading, UK
http://darc.nerc.ac.uk
Thanks to Alan Geer & Dominique Fonteyn
ESTEC 11-13 March 2004
COST Action #723
• Aims• Participants• Workplan• Deliverables• Timetable
• Research themes• Future work
COST Action plan
Topics
COST workshop & WG2 presentations
ESTEC 11-13 March 2004
COST Action #723
• Algorithms to assimilate UTLS datasets into troposphere/stratosphere GCMs & CTMs Build on theory Retrieval/forward model algorithms -> radiance assimilation Synergy (limb/nadir, different tools, chemistry/dynamics,…) Apply to NWP, chemical forecasting systems
• QC-datasets of UTLS O3 & H2O for use by scientific community cal-val (e.g. Envisat,…)
Use algorithms & QC-datasets -> (co-operation) ->• Assess state of UTLS & “understand” processes, using data
(analyses, …)• Information -> comprehensive analysis of anthropogenic impact
on UTLS region
Aims
ESTEC 11-13 March 2004
COST Action #723Statistics are a global mean at 10hPa
Ozone monitoring statistics at 10hPa in DARC assimilation
Analysis
O-B Residuals
Number of accepted
observations
Observations
Background
Cal-val: MIPAS
ESTEC 11-13 March 2004
COST Action #723
MIPAS ozone O-B22 –29 Sep 2002
global mean
Gaussian curve
bias
Gaussian errors
ESTEC 11-13 March 2004
COST Action #723
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
-> apply to Envisat
Synergy
ESTEC 11-13 March 2004
COST Action #723
Global map of ozone column amount 21 April 1997 12 GMTMLS ozone profile + GOME column ozone
(Dobson units: red high, blue low)
9-10 September 2002 COST Action #723
Synergy of Envisat data
Ozone distributionin space + time(+more species)
Limb geometry:Height resolved
information
Nadir geometry:Constraint on total
information
Partition information betweentroposphere and stratosphere
Atmosphere
Atmosphere
Envisat
Envisat
hν
hν
MIPAS (limb), SCIAMACHY (limb), GOMOS (occultation)
SCIAMACHY (nadir)
ESTEC 11-13 March 2004
COST Action #723
The SH polar vortex split of Sep 2002
MIPAS ozone
DARC analyses
Blue: low ozone; Red: high ozone; 10 hPa
CourtesyAlan Geer
Filling in gaps in knowledge
ESTEC 11-13 March 2004
COST Action #723
O3 evolution 31.5hPa;22 Sep -> 25 Sep 2002ACRI GOMOS analysesRed (high), blue (low)
Synergy: different tools
ESTEC 11-13 March 2004
COST Action #723
COST WG2
N2O from ODIN/SMR
Assimilated into MSDOL
55 hPa Sep 2002 SH
Laaziz EL Amraoui &
Philippe Ricaud
Obs. Bordeaux
Synergy: different tools
ESTEC 11-13 March 2004
COST Action #723
Ozone 475K ClOx = ClO+2*Cl2O2 475K
24 Sep 2002 12UTC: Ozone photochemistryBIRA-IASB MIPAS analyses: red (high), blue (low)
unobserved
Synergy: different tools & unobserved species
ESTEC 11-13 March 2004
COST Action #723
Assimilated and measured ozone profiles over Lerwick
GOME
CourtesyKNMI
Better agreementwith profileassimilation
Algorithms
ESTEC 11-13 March 2004
COST Action #723
GOME Total ozone assimilated 7-yr dataset:
GOA
www.knmi.nl/goa
Henk Eskes &
Arjo Segers
KNMI
QC-dataset
ESTEC 11-13 March 2004
COST Action #723
ASSET partners (NWP systems, sophisticated photochemical models, retrievals, data dissemination) -> links with theory & instrument teams
Lab studies / atmospheric photochemistry (J. Heyrovský, IPC, Ac. Sciences Czech Rep., Prague & Obs. Aquitain des Sciences de l’Univers, Lab. d’Astrodynamique, d’Astronomie et d’Aéronomie, Bordeaux)
More…
COST action a basis for co-operation: meetings, workshops, visits, summer schools,…
Co-operation
ESTEC 11-13 March 2004
COST Action #723
• Studies of Sep SH 2002 & other periods (e.g. for cal-val of Envisat data)
• Assimilation of MIPAS & ODIN (ongoing), GOMOS (started), SCIAMACHY,…
• H2O QC-datasets• Radiance assimilation• Studies with data from future missions (Eos Aura,…)
-> Co-operation between all actors: instrument teams, theory, NWP, modellers, DA, EO…
Encourage groups to use Short-Term Scientific Mission (STSM) funds for visits
-> Basis to consolidate group members & workplan
Future
ESTEC 11-13 March 2004
COST Action #723
Material for WG2 discussion on Friday
ESTEC 11-13 March 2004
COST Action #723
• 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 (ASSET partners & associates,…)
Group members
ESTEC 11-13 March 2004
COST Action #723
• Algorithms to assimilate research satellite data in UTLS (retrievals/forward models; radiance assimilation)
• 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, chemistry/dynamics,…
• QC-datasets (+metadata) in UTLS (T, O3, H2O)
• Deliverables (algorithms, QC-datasets, reports,…)
Workplan
ESTEC 11-13 March 2004
COST Action #723
• 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
Deliverables
ESTEC 11-13 March 2004
COST Action #723
• 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)
Timetable