Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
doi:10.5194/cp-2016-92
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
26 Sep 2016
Review status
A revision of this discussion paper was accepted for the journal Climate of the Past (CP) and is expected to appear here in due course.
Assimilation of Pseudo-Tree-Ring-Width observations into an Atmospheric General Circulation Model
Walter Acevedo1, Bijan Fallah2, Sebastian Reich1, and Ulrich Cubasch2 1Institut für Mathematik, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany
2Institut für Meteorologie, Freie Universität Berlin, Carl-Heinrich-Becker-Weg 6-10, 12165 Berlin, Germany
Abstract. We investigate the assimilation of Tree-Ring-Width (TRW) chronologies into an atmospheric global climate model using Ensemble Kalman Filter (EnKF) techniques and a process-based tree-growth forward model as observation operator. Our results, within a perfect-model experiment setting, indicate that the non-linear response of tree-growth to surface temperature and soil moisture does deteriorate the operation of the time-averaged (EnKF) methodology. Moreover, this skill loss appeared significantly sensitive to the structure of growth rate function, used to represent the Principle of Limiting Factors (PLF)s within the forward model. On the other hand, it was observed that the error reduction achieved by assimilating a particular pseudo-TRW chronology is modulated by the strength of the yearly internal variability of the model at the chronology site. This result might help the dendrochronology community to optimize their sampling efforts. In our experiments, the ''online'' (with cycling) paleao Data Assimilation (DA) approach did not outperform the ''offline'' (no-cycling) one, despite its considerable additional implementation complexity.

Citation: Acevedo, W., Fallah, B., Reich, S., and Cubasch, U.: Assimilation of Pseudo-Tree-Ring-Width observations into an Atmospheric General Circulation Model, Clim. Past Discuss., doi:10.5194/cp-2016-92, in review, 2016.
Walter Acevedo et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC1: 'Acevedo Review for Authors', Anonymous Referee #1, 10 Oct 2016 Printer-friendly Version Supplement 
AC1: 'Answer to reviewer #1', Bijan Fallah, 10 Nov 2016 Printer-friendly Version 
 
RC2: 'Reviewer comment', Anonymous Referee #2, 24 Oct 2016 Printer-friendly Version 
AC2: 'Answer to reviewer #2', Bijan Fallah, 10 Nov 2016 Printer-friendly Version 
 
AC3: 'The New Manuscript', Bijan Fallah, 10 Nov 2016 Printer-friendly Version Supplement 
Walter Acevedo et al.
Walter Acevedo et al.

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Short summary
This study investigates several aspects of Palaeo-Data Assimilation (PDA): (i) we test the performance of several forward operators in the framework of a PDA-based climate reconstruction, (ii) compare the PDA-based simulations' skill against the free ensemble runs and (iii) investigate the skill of the "online" (with cycling) DA and the "off-line" (no-cycling) DA.
This study investigates several aspects of Palaeo-Data Assimilation (PDA): (i) we test the...
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