Dr. rer. nat. Iris Kriest


Scientist at Research Unit Biogeochemical Modelling

Office:
Room 10
"Seeburg", Düsternbrooker Weg 2
Tel.: +49 431 600-4033
Fax: +49 431 600-4469
E-Mail: ikriest(at)geomar.de

Address:
GEOMAR Helmholtz Centre for Ocean Research Kiel
Düsternbrooker Weg 20
24105 Kiel

Research Interests

My research foci are description of biogeochemical processes in large-scale models, assessment of model skill,  and optimization of biogeochemical model components on a global scale. This involves analysis and synthesis of observations, as well as development and tests of different metrics. For my work I mainly use the  "Transport Matrix Method" developed by  Samar Khatiwala.

Education and Employment

  • since 2004 Research Scientist at IFM-GEOMAR, now GEOMAR | Helmholtz Centre for Ocean Research Kiel
  • 2002–2004  PostDoc, Max-Planck-Institute for Meteorology, Hamburg
  • 1999–2002  PostDoc, Institute for Marine Research, Kiel
  • 1995–1999  PhD student, Institute for Marine Research, Kiel (participation in cruise M32/5 and So120, Arabian Sea)
  • 1994  Scholarship (DAAD), Department of Fisheries and Oceans, St. John's, NF, Canada
  • 1994  Diploma in Biology, Institute for Marine Research Kiel, Christian-Albrechts-University of Kiel

Memberships

GEOMAR WEB (Women‘s Executive Board)

External Funding

 SFB 754 “Climate-Biogeochemistry Interactions in the Tropical Ocean” - Subproject B8 "The role of zooplankton in N-, P- and C-cycling and for the oxygen budget of tropical oxygen minimum zones” (German Science Foundation, DFG, Funding Period: 2016 – 2019)

PALMOD (German Climate Modeling Initiative) "From the Last Interglacial to the Anthropocene - Modeling a Complete Biogeochemical Cycle" - Workpackage 4.1 "A Model Calibration Framework Exemplified for the Ocean Biochemical Component" (Bundesministerium für Bildung und Forschung, Funding Period: 2015-2018)

Publications

Number of items: 65.

Articles in a Scientific Journal - peer-reviewed

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Kriest, I. and Oschlies, A. (2015) MOPS-1.0: modelling the regulation of the global oceanic nitrogen budget by marine biogeochemical processes Geoscientific Model Development, 8 . pp. 2929-2957. DOI 10.5194/gmd-8-2929-2015.

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Dutay, J. C., Tagliabue, A., Kriest, I. and van Hulten, M. M. P. (2015) Modelling the role of marine particle on large scale 231Pa, 230Th, Iron and Aluminium distributions Progress in Oceanography, 133 . pp. 66-72. DOI 10.1016/j.pocean.2015.01.010.

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Duteil, O., Koeve, W., Oschlies, A., Bianchi, D., Galbraith, E., Kriest, I. and Matear, R. (2013) A novel estimate of ocean oxygen utilisation points to a reduced rate of respiration in the ocean interior Biogeosciences (BG), 10 (11). pp. 7723-7738. DOI 10.5194/bg-10-7723-2013.

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Dietze, H. and Kriest, I. (2012) Cs-137 off Fukushima Dai-ichi, Japan - model based estimates of dilution and fate Ocean Science, 8 (3). pp. 319-332. DOI 10.5194/os-8-319-2012.

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Kriest, I., Oschlies, A. and Khatiwala, S. (2012) Sensitivity analysis of simple global marine biogeochemical models Global Biogeochemical Cycles, 26 . GB2029. DOI 10.1029/2011GB004072.

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Kriest, I., Khatiwala, S. and Oschlies, A. (2010) Towards an assessment of simple global marine biogeochemical models of different complexity Progress in Oceanography, 86 (3-4). pp. 337-360. DOI 10.1016/j.pocean.2010.05.002.

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Paulmier, A., Kriest, I. and Oschlies, A. (2009) Stoichiometries of remineralisation and denitrification in global biogeochemical ocean models Biogeosciences (BG), 6 . pp. 923-935.

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Kriest, I. and Oschlies, A. (2007) Modelling the effect of cell-size-dependent nutrient uptake and exudation on phytoplankton size spectra Deep-Sea Research Part I-Oceanographic Research Papers, 54 (9). pp. 1593-1618. DOI 10.1016/j.dsr.2007.04.017.


Kriest, I. and Evans, G. (2000) A vertically resolved model for phytoplankton aggregation Proc. Indian Acad. Sci (Earth Planet. Sci.), 109 (4) . pp. 453-469.


Kriest, I. and Evans, G. (1999) Representing phytoplankton aggregates in biogeochemical models Deep-Sea Research Part I-Oceanographic Research Papers, 46 . pp. 1841-1859.

Articles in a Scientific Journal - without review

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Schwinger, J., Goris, N., Tjiputra, J., Kriest, I., Bentsen, M., Bethke, I., Ilicak, M., Assmann, K. and Heinze, C. (2016) Evaluation of NorESM-OC (versions 1 and 1.2), the ocean carbon-cycle stand-alone configuration of the Norwegian Earth System Model (NorESM1) Geoscientific Model Development Discussions . pp. 1-73. DOI 10.5194/gmd-2015-256.


Maier-Reimer, E., Kriest, I., Segschneider, J. and Wetzel, P. (2005) The Hamburg Ocean Carbon Cycle Model HAMOCC5.1 - Technical Description Release 1.1. Reports on Earth System Science, 14 .

Book chapters

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Oschlies, A. and Kriest, I. (2011) Wann, woher und wohin? - Untersuchungen zur Geschichte und Zukunft von CO2 im Ozean Investigating the role of ocean ventilation in anthropogenic CO2 uptake and sequestration via Green functions In: Forschung im HLRN-Verbund 2011 . Konrad-Zuse-Zentrum für Informationstechnik, Berlin, Germany, pp. 86-87. ISBN 978-3-00-034131-1

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Oschlies, A. and Kriest, I. (2011) Wie gut sind unsere Beschreibungen biologischer Vorgänge im globalen Ozean? Einfluss von Remineralisierungsparametern auf globale biogeochemische Ozeanmodelle In: Forschung im HLRN-Verbund 2011 . Konrad-Zuse-Zentrum für Informationstechnik, Berlin, Germany, pp. 88-89. ISBN 978-3-00-034131-1

Presentations


Keller, D., Kriest, I., Koeve, W. and Oschlies, A. (2015) Southern Ocean Biological Impacts on Global Ocean Oxygen [Invited talk] In: Alfred Wegener Institute Helmholz Centre for Polar and Marine Research Invited seminar, 07.04.2015, Bremerhaven, Germany .


Bernadello, R., Martin, A., Khatiwala, S., Kriest, I., Henson, S., Dunne, J., Totterdell, I., Allen, I. and Yool, A. (2015) Evaluating our understanding of the biological carbon pump using the transport matrix method and global nutrient distributions, 2015. Evaluating our understanding of the biological carbon pump using the transport matrix method and global nutrient distributions [Talk] In: EGU General Assembly 2015, 12.–17.04.2015 , Vienna, Austria .


Kriest, I. (2015) Defining essential ocean variables (EOVs) for biogeochemistry [Invited talk] In: ConnectinGEO Workshop "Towards a sustainability process for GEOSS Essential Variables", 11.-12.06.2015, Bari, Italy .


Kriest, I. (2015) Dogs and cats: can models and measurements get along? [Talk] In: IOCCP International Sensors Summer Course, 22.06.-01.07.2015, Kristineberg, Sweden .


Kriest, I. and Oschlies, A. (2015) Regulation of global oceanic nitrogen and oxygen budget by marine biogeochemical processes [Talk] In: ASLO Aquatic Sciences Meeting 2015, 22.-27.02.2015, Granada, Spain .


Oschlies, A., Landolfi, A., Kriest, I., Somes, C. J., Dietze, H. and Koeve, W. (2015) A modeler's perspective on environmental controls of N2 fixation [Talk] In: ASLO Aquatic Sciences Meeting 2015, 22.-27.02.2015, Granada, Spain .


Kriest, I. and Oschlies, A. (2014) Evaluation of global biogeochemical ocean models simulated on millenial time scales [Talk] In: CarboChange Annual Project Meeting 2014, 07.-10.04.2014, Reykjavik, Iceland .


Kriest, I. and Oschlies, A. (2014) Simulating deep ocean biogeochemistry on a global scale: some aspects and challenges [Talk] In: IMBER Open Science Conference FUTURE OCEAN, 23.-27.06.2014, Bergen, Norway .


Kriest, I. and Oschlies, A. (2014) Simulating remineralization processes in oxygen minimum zones: uncertainties and consequences for global biogeochemical cycles [Talk] In: 46. International Liege Colloquium, 05.-09.05.2014, Liege, Belgium .


Kriest, I. and Oschlies, A. (2014) The good, the bad and the ugly - Evaluating biogeochemical ocean models in a world of uncertainties [Talk] In: Future Ocean: Cluster Retreat 2014, 29.-30.09.2014, Schleswig, Germany .


Kriest, I. and Slawig, T. (2014) Mathematical analysis and parameter identification for marine ecosystem models [Talk] In: DAAD Science Tour, 02.12.2014, Kiel, Germany .


Kriest, I. and Oschlies, A. (2013) Particle sinking and burial: their representation in global biogeochemical models, and their impact on distributions of tracers and fluxes [Talk] In: ASLO Aquatic Science Meeting, 17.-22.02.2013, New Orleans, USA .


Kriest, I. and Oschlies, A. (2013) The effect of remineralization and burial in global biogeochemical models [Talk] In: CarboChange Annual Project Meeting 2013, 24.-26.04.2013, Norwich, UK .


Wagner, H., Koeve, W., Kriest, I., Khatiwala, S. and Oschlies, A. (2013) Deep-Ocean evaluation of forced models with natural C-14 [Talk] In: CarboChange Annual Project Meeting 2013, 24.-26.04.2013, Norwich, UK .


Kriest, I. (2012) Confronting global marine biogeochemical models with observations [Invited talk] In: Workshop on Joint Oceanic and Atmospheric Biogeochemical Data Assimilation, 11.-13.07.2012, Göttingen, Germany .


Kriest, I. (2012) Potential impact of aggregation and size distribution for representation of tracer distributions and fluxes in global biogeochemical models [Invited talk] In: 2. International Workshop on Marine Aggregates from Molecular Principles to Biogeochemical Impacts, 15.-17.08.2012, Bremen, Germany .


Duteil, O., Kriest, I., Khatiwala, S. and Oschlies, A. (2011) Coupling of a complex biogeochemical model with the Transport Matrix Method : quantification of the impact of margin iron input on the ecosystem [Talk] In: EGU General Assembly 2011, 03.-08.04.2011, Vienna, Austria .


Koeve, W., Oschlies, A., Kriest, I., Duteil, O. and Dietze, H. (2011) Evaluating and optimising paramerisations of pelagic calcium carbonate production in global biogeochemical ocean models [Talk] In: BIOACID Annual Meeting 2011, 26.-30.09.2011, Bremen, Germany .


Kriest, I. (2011) Respective influences of circulation and biogeochemical parameters on simulated nutrient and oxygen fields [Talk] In: Carbochange Kick-off Meeting, 07.-10.03.2011, Bergen, Norway .


Kriest, I. (2011) Sensitivity of biogeochemical models to particle export and recycling [Invited talk] In: 3. GEOTRACES Data-Model Synergy Workshop, 14.-17.11.2011, Barcelona, Spain .

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Oschlies, A., Koeve, W., Kriest, I., Duteil, O. and Khativala, S. (2010) Assessing global biogeochemical models used in OA research [Talk] In: Joint EPOCA, BIOACID and UKOARP Meeting, 27.09.-30.09.2010, Bremerhaven . Abstracts : Joint EPOCA, BIOACID an UKOARP Meeting ; Atlantic Hotel, Bremerhaven, Germany, September 27th - 30th, 2010 ; p. 39 .


Kriest, I. (2009) Representation of biogeochemical processes in global ocean models and its effect on simulated nutrients and oxygen fields [Talk] In: FB2 Seminar, Leibniz-Institute of Marine Sciences (IFM-GEOMAR), 16.11.2009, Kiel, Germany .


Kriest, I. (2009) Size distributions of marine plankton: comparison of model results to observations [Invited talk] In: Seminar "Komplexe Systeme und Modellierung", 04.06, Oldenburg .


Kriest, I. and Oschlies, A. (2009) Sinking and remineralisation of particulate organic matter in largescale models of marine biogeochemistry [Talk] In: ASLO Aquatic Sciences Meeting, 28.01, Nice, France .


Kriest, I., Oschlies, A. and Khatiwala, S. (2009) Parameterisation of Export, Sinking and Remineralisation and its Effect on Simulated Tracers in Largescale Models of Marine Biogeochemistry [Talk] In: AGU Chapman Conference on the Biological Carbon Pump of the Oceans, 03.09, Brockenhurst, Hampshire, UK .


Kriest, I., Oschlies, A. and Khatiwala, S. (2009) Parameterisation of remineralisation length scales in large-scale models of marine biogeochemistry [Talk] In: 2. GEOTRACES data/model synergy workshop, 07.12, Paris, France .


Shigemitsu, M., Yamanaka, Y., Watanabe, Y., Okoda, N., Kriest, I. and Oschlies, A. (2009) Seasonal characteristics of the carbon isotope biogeochemistry of settling particles in the western subarctic Pacific: a model study [Talk] In: 2. GEOTRACES data/model synergy workshop, 07.12, Paris, France .


Kriest, I., Oschlies, A. and Khatiwala, S. (2008) Development and assessment of a model for global ecosystems [Talk] In: Final MERSEA Plenary Meeting, 29.04, Paris, France .


Kriest, I., Oschlies, A. and Khatiwala, S. (2008) Development and assessment of global marine biogeochemical models of varying complexity [Talk] In: 4. Scientific Computing Seminar, Parameter Estimation, Optimization and Inverse Modeling in Geosciences, 16.06, Kiel .


Kriest, I. (2007) Observations of particle size: how can we assess size based models? [Talk] In: German Advances in Marine Ecosystem Modelling, 13.11, Hamburg .


Kriest, I. (2007) POM sinking in large-scale models of marine biogeochemical cycles: its parameterisation, implicit assumptions and relation to surface ocean processes [Talk] In: FB2 Seminar, Leibniz-Institute of Marine Sciences (IFM-GEOMAR), 05.11.2007, Kiel, Germany .


Kriest, I. and Oschlies, A. (2007) Size dependent processes in biogeochemical models [Talk] In: German Advances in Marine Ecosystem Modelling, 01.03, Hamburg .


Kriest, I. and Oschlies, A. (2007) The interplay between particle size distribution and biogeo¬chemical processes [Talk] In: MERSEA 4th annual meeting, 24.04, Rome, Italy .


Garcon, V., Salihoglu, B., Kriest, I. and Oschlies, A. (2006) Phytoplankton distribution and carbon production in the North Atlantic [Other] In: 13. Ocean Sciences Meeting, 23.02, Honolulu, Hawaii, USA .


Kriest, I. and Oschlies, A. (2006) A model of cell size dependent phytoplankton physiology - first results and comparison with observations [Other] In: MERSEA 3. Plenary Meeting, 06.03, London, UK .


Segschneider, J., Kriest, I., Maier-Reimer, E., Gehlen, M. and Schneider, B. (2006) Impact of vertical flux simulation on surface pCO2 [Other] In: 2. Annual CarboOcean Meeting, 05.12, Maspalomas, Gran Canaria, Spain .

Conference posters


Kriest, I. and Oschlies, A. (2015) Calibrating a global ocean model of N, P, O cycles against observed tracer distributions [Poster] In: EGU General Assembly 2015, 12.–17.04.2015 , Vienna, Austria .


Oschlies, A., Kriest, I., Koeve, W., Duteil, O. and Schartau, M. (2015) Evaluating oxygen and oxygen minimum zones in global biogeochemical models [Poster] In: EGU General Assembly 2015, 12.–17.04.2015 , Vienna, Austria . Geophysical Research Abstracts, 17 (EGU2015-15645).


Wagner, H., Koeve, W., Kriest, I. and Oschlies, A. (2015) Sensitivity of simulated deep ocean natural radiocarbon to gas exchange velocity and historical atmospheric ∆14C variations [Poster] In: EGU General Assembly 2015, 12.–17.04.2015 , Vienna, Austria . Geophysical Research Abstracts, 17 (EGU2015-11423).


Landolfi, A., Kriest, I., Koeve, W. and Oschlies, A. (2014) N inventory sensitivity to organic matter remineralization [Poster] In: EGU General Assembly 2014, 27.04.-02.05.2014, Vienna, Austria .


Oschlies, A., Kriest, I. and Duteil, O. (2014) A biogeochemical model assessment platform [Poster] In: WGOMD Workshop on High Resolution Ocean Climate Modeling, 07.-09.04.2014, Kiel, Germany .


Koeve, W., Duteil, O., Dietze, H., Kriest, I. and Oschlies, A. (2012) Applying the TA* method for the evaluation of the CaCO3-cycle in ocean models [Poster] In: Ocean Sciences Meeting 2012, 20.-24.02.2012, Salt Lake City, USA .


Wagner, H., Koeve, W., Kriest, I. and Oschlies, A. (2012) Sensitivity of modeled oceanic radiocarbon to gas exchange formulation [Poster] In: CARBOCHANGE Annual Meeting 2012, 07.-09.03.2012, Galway, Ireland .


Losa, S. N., Schröter, J., Kriest, I. and Oschlies, A. (2006) Estimating biological parameters of a size-dependent NPZD ecosystem model [Poster] In: EGU General Assembly 2006, 02.-07.04, Vienna, Austria .


Salihoglu, B., Garcon, V., Oschlies, A. and Kriest, I. (2006) Influence of nutrient utilization and remineralization stoichiometry on phytoplankton distribution and carbon export: a modeling study at BATS [Poster] In: EGU General Assembly 2006, 02.-07.04, Vienna, Austria .

Theses - published by a publisher

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Kriest, I. (1999) The influence of phytoplankton aggregation on sedimentation - A model study (Doctoral thesis/PhD), Christian-Albrechts-Universität Kiel, Kiel, Germany, 135 pp. . Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel, 306 . DOI 10.3289/ifm_ber_306.

This list was generated on Tue May 24 21:00:47 2016 CEST.