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Author Tsuruta, A., T. Aalto, L. Backman, J. Hakkarainen, I.T. van der Laan-Luijkx, M.C. Krol, R. Spahni, S. Houweling, M. Laine, M. van der Schoot, R. Langenfelds, R. Ellul, and W. Peters, Development of CarbonTracker Europe-CH4 – Part 1: system set-up and sensitivity analyses, Geosci. Model Dev. Discuss., 2016a.
Title Development of CarbonTracker Europe-CH4 – Part 1: system set-up and sensitivity analyses Type Journal Article
Year 2016 Publication Geoscientific Model Development Discussions Abbreviated Journal
Volume Issue Pages
Keywords
Abstract CarbonTracker Europe-CH4 (CTE-CH4) inverse model versions 1.0 and 1.1 are presented. The model optimizes global surface methane emissions from biosphere and anthropogenic sources using an ensemble Kalman filter (EnKF) based optimization method, using the TM5 chemistry transport model as an observation operator, and assimilating global in-situ atmospheric methane mole fraction observations. In this study, we examine sensitivity of our CH4 emission estimates on the ensemble size, covariance matrix, prior estimates, observations to be assimilated, assimilation window length, convection scheme in TM5, and model structure in the emission estimates by performing CTE-CH4 with several set-ups. The analyses show that the model is sensitive to most of the parameters and inputs that were examined. Firstly, using a large enough ensemble size stabilises the results. Secondly, using an informative covariance matrix reduces uncertainty estimates. Thirdly, agreement with discrete observations became better when assimilating continuous observations. Finally, the posterior emissions were found sensitive to the choice of prior estimates, convection scheme and model structure, particularly to their spatial distribution. The distribution of posterior mole fractions derived from posterior emissions is consistent with the observations to the extent prescribed in the various covariance estimates, indicating a satisfactory performance of our system. Academic paper: Development of CarbonTracker Europe-CH4 – Part 1: system set-up and sensitivity analyses. Available from: https://www.researchgate.net/publication/306338110DevelopmentofCarbonTrackerEurope-CH4-Part1systemset-upandsensitivityanalyses [accessed Apr 4, 2017].
Programme 416
Campaign
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 1991-962X ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 6403
Permanent link to this record
 
 
Author Tsuruta, A., T. Aalto, L. Backman, J. Hakkarainen, I.T. van der Laan-Luijkx, M.C. Krol, R. Spahni, S. Houweling, M. Laine, E. Dlugokencky, A.J. Gomez-Pelaez, M. van der Schoot, R. Langenfelds, R. Ellul, A. J., F. Apadula, C. Gerbig, D.G. Feist, R. Kivi, Y. Yoshida, and W. Peters
Title Development of CarbonTracker Europe-CH4 – Part 2: global methane emission estimates and their evaluation for 2000–2012. Type Journal Article
Year 2016 Publication Geoscientific model development discussions Abbreviated Journal
Volume Issue Pages
Keywords
Abstract Gobal methane emissions were estimated for 2000–2012 using the CarbonTracker Europe-CH4 (CTE-CH4) data assimilation system. In CTE-CH4, the anthropogenic and biosphere emissions of CH4 are simultaneously constrained by global atmospheric in-situ methane mole fraction observations. We use three configurations developed in Tsuruta et al. (2016) to assess the sensitivity of the CH4 flux estimates to (a) the number of unknown flux scaling factors to be optimized which in turn depends on the choice of underlying land-ecosystem map, and (b) on the parametrization of vertical mixing in the 30 atmospheric transport model TM5. The posterior emission estimates were evaluated by comparing simulations to surface in-situ observation sites, to profile observations made by aircraft, to dry air total column-averaged mole fractions (XCH4) observations from the Total Carbon Column Observing Network (TCCON), and to XCH4 retrievals from the Greenhouse gases Observing SATellite (GOSAT). Our estimated posterior mean global total emissions during 2000–2012 are 516 $\pm$ 51 Tg CH4 yr\textminus1, and emission estimates during 2007–2012 are 18 Tg CH4 yr\textminus1 greater than those from 2001–2006, mainly driven by an 35 increase in emissions from the south America temperate region, the Asia temperate region and Asia tropics. The sensitivity of the flux estimates to the underlying ecosystem map was large for the Asia temperate region and Australia, but not significant in the northern latitude regions, i.e. the north American boreal region, the north American temperate region and Europe. Instead, the posterior estimates for the northern latitude regions show larger sensitivity to the choice of convection scheme in TM5. The Gregory et al. (2000) mixing scheme with faster interhemispheric exchange leads to higher estimated CH4 emissions at northern latitudes, and lower emissions in southern latitudes, compared to the estimates using Tiedtke (1989) convection scheme. Our evaluation with non-assimilated observations showed that posterior mole fractions were better matched with the 5 observations when Gregory et al. (2000) convection scheme was used.
Programme 416
Campaign
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 1991-962X ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 6509
Permanent link to this record
 
 
Author Locatelli R, Bousquet P, Hourdin F, Saunois M, Cozic A, Couvreux F, Grandpeix J-Y, Lefebvre M-P, Rio C, Bergamaschi P, Chambers S D, Karstens U, Kazan V, van der Laan S, Meijer H A J, Moncrieff J, Ramonet M, Scheeren H A, Schlosser C, Schmidt M, Vermeulen A, Williams A G,
Title Atmospheric transport and chemistry of trace gases in LMDz5B: evaluation and implications for inverse modelling Type Journal Article
Year 2015 Publication Geosci. Model Dev. Abbreviated Journal
Volume 8 Issue 2 Pages 129-150
Keywords
Abstract
Programme 416
Campaign
Address
Corporate Author Thesis
Publisher Copernicus Publications Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 1991-9603 ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 5345
Permanent link to this record
 
 
Author O'Connor, F. M. Johnson, C. E. Morgenstern, O. Abraham, N. L. Braesicke, P. Dalvi, M. Folberth, G. A. Sanderson, M. G. Telford, P. J. Voulgarakis, A. Young, P. J. Zeng, G. Collins, W. J. Pyle, J. A.
Title Type Journal Article
Year 2014 Publication Geoscientific Model Development Abbreviated Journal
Volume 7 Issue 1 Pages 41-91
Keywords
Abstract In this paper, we present a description of the tropospheric chemistry component of the UK Chemistry and Aerosols (UKCA) model which has been coupled to the Met Office Hadley Centre's HadGEM family of climate models. We assess the model's transport and scavenging processes, in particular focussing on convective transport, boundary layer mixing, wet scavenging and inter-hemispheric exchange. Simulations with UKCA of the short-lived radon tracer suggest that modelled distributions are comparable to those of other models and the comparison with observations indicate that apart from a few locations, boundary layer mixing and convective transport are effective in the model as a means of vertically redistributing surface emissions of radon. Comparisons of modelled lead tracer concentrations with observations suggest that UKCA captures surface concentrations in both hemispheres very well, although there is a tendency to underestimate the observed geographical and interannual variability in the Northern Hemisphere. In particular, UKCA replicates the shape and absolute concentrations of observed lead profiles, a key test in the evaluation of a model's wet scavenging scheme. The timescale for inter-hemispheric transport, calculated in the model using a simple krypton tracer experiment, does appear to be long relative to other models and could indicate deficiencies in tropical deep convection and/or insufficient boundary layer mixing. We also describe the main components of the tropospheric chemistry and evaluate it against observations and other tropospheric chemistry models. In particular, from a climate forcing perspective, present-day observed surface methane concentrations and tropospheric ozone concentrations are reproduced very well by the model, thereby making it suitable for long centennial integrations as well as studies of biogeochemical feedbacks. Results from both historical and future simulations with UKCA tropospheric chemistry are presented. Future projections of tropospheric ozone vary with the Representative Concentration Pathway (RCP). In RCP2.6, for example, tropospheric ozone increases up to 2010 and then declines by 13% of its year-2000 global mean by the end of the century. In RCP8.5, tropospheric ozone continues to rise steadily throughout the 21st century, with methane being the main driving factor. Finally, we highlight aspects of the UKCA model which are undergoing and/or have undergone recent developments and are suitable for inclusion in a next-generation Earth System Model.
Programme 416
Campaign
Address
Corporate Author Thesis
Publisher Copernicus GmbH Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 1991-9603 ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 5766
Permanent link to this record
 
 
Author Passalacqua, O., Gagliardini, O., Parrenin, F., Todd, J., Gillet-Chaulet, F., and Ritz, C
Title Performance and applicability of a 2.5-D ice-flow model in the vicinity of a dome Type Journal Article
Year 2016 Publication Geosci. model dev. Abbreviated Journal
Volume 9 Issue 7 Pages 2301-2313
Keywords
Abstract In ice-flow modelling, computing in 3-D requires a lot of resources, but 2-D models lack physical likelihood when the flow is diverging. That is why 2-D models accounting for the divergence, so-called 2.5-D models, are an interesting trade-off. However, the applicability of these 2.5-D models has never been systematically examined. We show that these models are ineffective in the case of highly diverging flows, but also for varying temperature, which was not suspected.
Programme 902
Campaign
Address
Corporate Author Thesis Bachelor's thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 1991-9603 ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 6527
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Author Aki Tsuruta, Tuula Aalto, Leif Backman, Janne Hakkarainen, Ingrid T. van der Laan-Luijkx, Maarten C. Krol, Renato Spahni, Sander Houweling, Marko Laine, Ed Dlugokencky, Angel J. Gomez-Pelaez, Marcel van der Schoot, Ray Langenfelds, Raymond Ellul, Jgor Arduini, Francesco Apadula, Christoph Gerbig, Dietrich G. Feist, Rigel Kivi, Yukio Yoshida, Wouter Peters
Title Type Journal
Year 2017 Publication Geoscientific Model Development Abbreviated Journal
Volume 10 Issue 3 Pages 1261-1289
Keywords
Abstract
Programme 416
Campaign
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 1991-959X ISBN 1991-959X Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 7332
Permanent link to this record
 
 
Author Ingrid T. van der Laan-Luijkx, Ivar R. van der Velde, Emma van der Veen, Aki Tsuruta, Karolina Stanislawska, Arne Babenhauserheide, Hui Fang Zhang, Yu Liu, Wei He, Huilin Chen, Kenneth A. Masarie, Maarten C. Krol, Wouter Peters
Title Type Journal
Year 2017 Publication Geoscientific Model Development Abbreviated Journal
Volume 10 Issue 7 Pages 2785-2800
Keywords
Abstract
Programme 416
Campaign
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 1991-959X ISBN 1991-959X Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 7333
Permanent link to this record
 
 
Author Mathieu Barrere, Florent Domine, Bertrand Decharme, Samuel Morin, Vincent Vionnet, Matthieu Lafaysse
Title Type Journal
Year 2017 Publication Geoscientific Model Development Abbreviated Journal
Volume 10 Issue 9 Pages 3461-3479
Keywords
Abstract
Programme 1042
Campaign
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 1991-959X ISBN 1991-959X Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 7335
Permanent link to this record
 
 
Author
Title Numerical experiments on vapor diffusion in polar snow and firn and its impact on isotopes using the multi-layer energy balance model Crocus in SURFEX v8.0 Type Journal
Year 2018 Publication Geoscientific Model Development Abbreviated Journal
Volume 11 Issue 6 Pages 2393-2418
Keywords
Abstract

Abstract. To evaluate the impact of vapor diffusion on isotopic composition variations in snow pits and then in ice cores, we introduced water isotopes in the detailed snowpack model Crocus. At each step and for each snow layer, (1) the initial isotopic composition of vapor is taken at equilibrium with the solid phase, (2) a kinetic fractionation is applied during transport, and (3) vapor is condensed or snow is sublimated to compensate for deviation to vapor pressure at saturation.

We study the different effects of temperature gradient, compaction, wind compaction, and precipitation on the final vertical isotopic profiles. We also run complete simulations of vapor diffusion along isotopic gradients and of vapor diffusion driven by temperature gradients at GRIP, Greenland and at Dome C, Antarctica over periods of 1 or 10 years. The vapor diffusion tends to smooth the original seasonal signal, with an attenuation of 7 to 12% of the original signal over 10 years at GRIP. This is smaller than the observed attenuation in ice cores, indicating that the model attenuation due to diffusion is underestimated or that other processes, such as ventilation, influence attenuation. At Dome C, the attenuation is stronger (18%), probably because of the lower accumulation and stronger ?18O gradients.
Programme 1110
Campaign
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 1991-959X ISBN 1991-959X Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 7356
Permanent link to this record
 
 
Author
Title The Louvain-La-Neuve sea ice model LIM3.6: global and regional capabilities Type Journal
Year 2015 Publication Geoscientific Model Development Abbreviated Journal
Volume 8 Issue 10 Pages 2991-3005
Keywords
Abstract
Programme 1015,1244
Campaign
Address
Corporate Author Thesis Bachelor's thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 1991-959X ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 8162
Permanent link to this record