Match Campaign Manual

Introduction

This manual is mainly but not only addressed to the staff of ozonesonde stations, which participate in ozonesonde Match campaigns. It gives some background and advice for the day to day business of a Match campaign. After touching briefly the aims of the Match campaigns a description of the Match method is given. Important advice about the submission of data and about the contact persons is given afterwards. The history of the Match technique as well as results are mentioned briefly. An attempt to acknowledge the work of the station staff is tried at the end.
For those not familiar with the stratospheric ozone problem The Ozone Hole Tour of the University of Cambridge is recommended.

Aim

The two main aims of Match campaigns are:
1. to measure the chemical ozone loss in polar regions, and
2. to check our understanding of the underlying processes.

Method

The idea of Match is to probe, i.e. to determine the ozone content of, a lot of air parcels twice during their way through the atmosphere. This is achieved by coordinating the soundings roughly in the following way.
1. The trajectories (transport paths) of air masses, which had been measured by ozonesondes previously, are analysed and forecasted by meteorologists at the FU Berlin.
2. These trajectories are checked for cases when such an air mass reaches the vicinity of one of the participating measuring sites (ozonesonde station) within 10 days.
3. The staff at the ozonesonde station gets informed and is asked to launch an ozonesonde in order to examine the same air mass for a second time.
A decrease in the ozone concentration within the time period of the two sonde flights can then be attributed to chemical ozone depletion. Due to the great number of sonde pairs, statistically significant ozone loss rates can be determined.
The coordination scheme is shown in detail in the Figure below. The coordination team at AWI Potsdam sends out an alert message at least 24 hours (time period B) before a launch at a particular station is predicted to produce a match. The next day until 10:00 UT these stations usually will either get a confirmation message or a non-confirmation message for the requested sounding on the same day (time period A), depending on the newest forecast data. The confirmation message contains an updated optimal launch time and a launch window.

Sondes that can be released inside the launch window but not close to the optimal launch time should make the match also, but probably with a worse match radius. (The match radius is defined as the distance between the locations of the air mass in mind and the ozonesonde at the altitude of the air mass. Shorter match radii are more valuable for the analysis, of course.) The launch window is covering the whole period where a launched sonde is expected to make a match. Sondes launched outside the window can not be expected to make that match.
Any alert messages or confirmation messages which are send out are recommendations, only! Sometimes in rare cases it will happen, that trouble in receiving the met-data for computing the trajectories will delay the emission of these messages. In these cases the coordination team will be quite busy in getting the needed data and will usually not be able to give special advice to the station staff. However, the coordination team will of course try to serve every received request. In cases when time goes on and the station staff has to make a decision about an ozonesonde launch with respect to an alert message the day before, a launch due to the informations in the alert messages is recommended if the expected match radius is less than 250 km. In all other cases no ozonesonde launch is recommended like a non-confirmation message would do.
Alert and confirmation messages are send out according to the availability windows at the particular stations. Such availability windows vary quite a lot from station to station and look in the coordination files like e.g.:
During the Arctic campaigns mainly the stations north of 60 degree north are involved. However, usually once or twice during a winter polar stratospheric air moves across mid-latitudes. During these events the participation of all mid-latitude stations is highly welcomed and needed. In these cases the mid-latitude stations will get a separate, non-specific alert mail several days before.

Data submission

Please provide all ozonesonde data as soon as possible. The prefered way is to upload the data to the Nadir data base at NILU. The corresponding directory is:
/nadir/projects/vintersol/data/o3sondes/STATIONNAME
The format should be the well known NASA Ames format 2160. If possible the nasaconv software developed at the Finnish Meteorological Institute (FMI) in Sodankylä should be used.
In case an ozonesonde data file cannot be transmitted to the Nadir data base within a reasonable time, the coordination team would be happy if the station staff would be able to follow one of two options:
An ozonesonde data file does exist: Please email the file to the coordination team with the phrase "Match data" in the subject line.
An ozonesonde data file does not exist, yet: Please email or fax a short message with standardised informations about the messured ozone profile to the coordination team. In case of a email submission please use the phrase "Match notice" in the subject line. The Match notice should have the following format:
Please find the details of the description in the glossary, when needed. It would be very helpful if this format would be strictly used, in order to serve automatic processes which subsequently follow in the coordination procedure.
Please report any changes in station characteristics immediately to the coordination team, i.e.
Changes in the availability window at the station in particular with respect to the last Match campaign. Changes in the communication coordinates (email address, fax number).

Contacts

The campaigns will be coordinated by Holger Deckelmann with some assistance by Markus Rex and Peter von der Gathen at AWI Potsdam.
The quality control team at the FMI will have a look at the incoming ozonesonde data in near real time in order to search for typical profile features which cover most probable sonde failures and will flag them accordingly.
The Nadir data base at NILU, where all ozonesonde data should be uploaded, will be supervised by Aasmund Fahre Vik.
Email addresses of the contact points above will be send out by separate emails to the particular stations in order to avoid spam emails.

History

During the north-hemispheric winter 1991/92 an concerted campaign funded by the EU and national agencies, the European Arctic Stratospheric Ozone Experiment (EASOE), took place. The activities included the launch of a large number (~1400) of ozonesondes in the Arctic and in the mid-latitudes. This data set were used afterwards to determine Arctic ozone losses for the first time with the Match method. Since the launches were not coordinated only matches were used which happened by chance. Fortunately, because of the large number of soundings enough matches had been found for a successful analysis. This way the method were established and for the Second European Stratospheric Arctic and Mid-latitude Experiment (SESAME) in the winter 1994/95 the method had been advanced to the active form with coordinated launches as described above. Since then in nearly each Arctic winter a Match campaign was performed. The only exceptions were the winters 2001/02 and 2003/04, which were relatively warm stratospheric winters with minor ozone losses. In the mean time the winters 1992/93 and 1993/94 were analysed by the passive Match approach, too. In total an analysed ozonesonde Match data exist for 12 Arctic winters and one Antarctic winter (2003).
The technique has been picked up by Sasano and co-workers for determining ozone loss rates from data of the space-borne sensor Improved Limb Atmospheric Spectrometer (ILAS) [Sasano et al., 2000; Terao et al., 2002].

Results

The results of the Match analyses in the polar vortex have been published in several peer reviewed papers. A number of further papers which use Match results for detailed model studies or picked up the technique for own investigations have also been published. Most important outcomes and implications of the Match method are:

Acknowledgements

Arctic Match campaigns are mainly funded by the EU and national agencies. The Match scientists are in particular grateful to the staff at all stations which perform the ozonesonde launches! Without their engagement no Match results would have been archieved in the past.
Below lists of northern hemispheric and Antarctic station names, the corresponding staff members as well as the principal investigators is given. The missing names of the staff members will be included as soon as their are known.

Ozonesonde station net (Arctic Match campaigns)

Station Station staff Principle Investigator
Alert John Kivisto David Tarasick
Andøya Georg Hansen
Athens Costas Varotsos
Boulder Bryan Johnson
Bratts Lake Ormanda Niebergall David Tarasick
Churchill John Hrominchuk David Tarasick
De Bilt Marc Allaart
Edmonton Dayna McIntyre David Tarasick
Egbert Andrew Sheppard, Helena Dryfhout-Clark, Lauriant Giroux David Tarasick
Eureka David Tarasick
Goose Bay David Tarasick
Observatoire de Haute Provence Pierre Da Canceicao, Gérard Velghe Claude Vialle
Hohenpeißenberg Hans Claude
Jægersborg Paul Eriksen Paul Eriksen
Jokioinen Esko Kyrö
Keflavik Jens Kristinsson Manuel Gil
Kelowna Bob McInnes David Tarasick
Kiruna Lars-Erik Sarri
Kühlungsborn Michael Gerding
Legionowo Michal Orlowski, Barbara Krapiec Grzegorz Zablocki
Lerwick Martin Leishman, William Hamilton, Pete Davis, Paul Hargreaves,
Mike Bradley, Pete Kerr, Owen Barton
David Moore
Lindenberg Susanne Meier Susanne Meier
Moshiri Hideaki Nakane
North Pole Drifting Station 38 Nikita Zinoviev Alexander Makshtas
Ny-Ålesund Kathrin Lang, René Bürgi, Thomas Ribeaud Peter von der Gathen
Ørland Georg Hansen
Payerne Pierre Viatte
Prague Barbora Klikova Pavla Skrivankova
Resolute Wayne Davidson David Tarasick
Salekhard Tatjana Popova, Vladimir Balashov Valery Dorokhov
San Pietro Capofiume Fabrizio Ravegnani
Scoresbysund Tore Andreasen Paul Eriksen
Sodankylä Esko Kyrö
Summit / Greenland Andrew Clark Bryan Johnson
Tenerife Juan Mario Sancho
Thessaloniki Christos Zerefos
Thule Michael Teckemeier, Bjarne Schøder Paul Eriksen
Uccle Hugo DeBacker
Valentia Michael Crean Keith Lambkin
Wallops Island Francis Schmidlin
Yakutsk Aleksandr Sokolov Valery Dorokhov
Yarmouth Michael Crosby David Tarasick

Ozonesonde station net (Antarctic Match campaigns)

Station Station Staff Principal Investigator
Belgrano Marcelo Bisogni, Pablo Origlia, Hernan Barretto Margarita Yela
Davis Denise Allen, Colin Hughes, Didier Monselesan, Annette Schlub Andrew Klekociuk
Dome Concordia Maurizio Busetto Marion Marchand, Christine David, Philippe Keckhut
Dumont d'Urville Antoine Kergomard, Pierre Tixerand, Geneviève Caisso Marion Marchand, Christine David, Philippe Keckhut
Marambio Ricardo Sánchez, Daniel Aguero Esko Kyrö
McMurdo Paula Crock Terry Deshler
Neumayer Claudia Rudolph, Karin Smolla Gert König-Langlo
South Pole Johan Booth, Emrys Hall Bryan Johnson
Syowa Hideaki Nakajima, Kosuke Saeki Kaoru Sato, Hideaki Nakajima