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ICOS/IMECC Workshop on Quantitative Network Design (QND) took place at Jusssieu in Paris (France) on 11-12 June, 2009. The workshop aims to discuss possible methods of QND and to apply the IMECC NA2 research to the need of ICOS project.


Partcipants

From the left (Dario Papale, Peter Rayner, Thomas Kaminski, Ernest Koffi, EnricoTomelleri, Marko Scholze, Han Dolman, Philippe Ciais). Frederic Chevallier and Leonard Rivier are missing.

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The agenda and the report on the meeting can be found hereafter or download from here. The slides of the presentations (pdf format) can also be download hereafter.

Agenda

Thursday June 11
12:00 Gathering
12:30 working lunch nearby
13:45 Welcome and logistics (Rayner)
13:50 Introduction (Dolman)
14:10 Quantitative Network Design (.pdf) by Peter Rayner, LSCE, Gif/Yvette, France

Estimating European fluxes by various methods
14:30 Network Design: What we learned, what we want to learn (?)(.pdf) by Enrico Tomelleri, Max-Planck Institute, Jena, Germany
15:00 Are representativeness and Network Design two different problems? by Dario Papale, UNITUS, Viterbo, Italy . For details, contact Dario Papale
15:30 coffee
15:50 Variational flux estimation (.pdf) by Frederic Chevallier, LSCE, Gif/Yvette, France
16:20 The Carbon Cycle Data Assimilation System, CCDAS (.pdf) by Marko Scholze, QUEST, University of Bristol, United Kingdom

Existing QND efforts
16:50 IMECC NA2: Development of a Network Design Tool (.pdf)
by Thomas Kaminski, Fastopt, Germany
17:20 Network design in ICOS: some issues (.pdf)
by Han Dolman, University of Amstersdam, The Netherlands
17:40 Discussion

Friday June 12
Getting down to business
09:00 What does ICOS need? (Ciais & Dolman)
09:30 Discussion
12:00 close

As a deliberately free-form meeting this agenda of course ran late as the discussion of each presentation took longer than proposed.

Over-arching questions:
What is the redundancy in the current network?
It was generally noted that this depends on the underlying complexity of the biosphere, itself a fundamental research topic and the subject of several actions arising from the meeting. We noted one could not answer this question without considering management.

It was noted that some questions had technical implications for the design of the ICOS instrument package, particularly the value of the virtual tall tower measurements.

We noted that the CCDAS tool being used in IMECC-NA2 is the only one currently using flux and concentration measurements simultaneously. It seemed valuable to use this shell around several models.

Several empirical methods can upscale flux measurements to continental carbon balances in which case the network optimisation problem becomes a sampling problem of climate and ecosystem variability. One can test this upscaling either with simple models or an artificial neural network by keeping back some flux sites for validation.

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