PD Dr. rer. nat. Iris Kriest

Scientist in research unit Biogeochemical Modeling

Office:
Room 5.505
Tower 5, Floor 5

Tel.: +49 431 600-1772
E-Mail: ikriest(at)geomar.de

Address:
GEOMAR Helmholtz Centre for Ocean Research Kiel
Wischhofstraße 1-3
24148 Kiel

Research Interests

My research foci are description of biogeochemical processes in large-scale models, assessment of model skill, and calibration of biogeochemical model parameters (constants) on a global scale. This involves analysis and synthesis of observations, in close collaboration with observing scientists, as well as development of different metrics for global model optimization. For my work I mainly use the "Transport Matrix Method" developed by Samar Khatiwala.

Education and Employment

2019 Habilitation at Kiel University
since 2004 Research Scientist at IFM-GEOMAR, now GEOMAR
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
1994 Scholarship (DAAD), Department of Fisheries and Oceans, St. John's, NF, Canada
1994 Diploma (Biology), Institute for Marine Research Kiel, Kiel University

Expeditions

2019 R/V Meteor M158 (Atlantic)
2016 R/V Meteor M130 (Atlantic)
1997 R/V Sonne SO120 (Arabian Sea)
1995 R/V Meteor M32/5 (Indian Ocean/Arabian Sea)
1993 R/V Meteor M25/2 (Mediterranean Sea)

Memberships

SCOR Working Group 161 ReMO "Respiration in the Mesopelagic Ocean" (co-chair)

External Funding

OceanICU "Understanding Ocean Carbon" - work package 6 (lead) "Determine significance of key processes in the evolving Ocean C Cycle" (EU Horizon; funding period 2022-2027)

CUSCO "Coastal Upwelling System in a Changing Ocean" - work package 5 (co-lead) "Particle size distribution, particle export and zooplankton-particle interactions" (Bundesministerium für Bildung und Forschung, funding period: 2019-2021)

PALMOD (German Climate Modeling Initiative) "From the Last Interglacial to the Anthropocene - Modeling a Complete Biogeochemical Cycle" - work package 4.1 (lead) "A model calibration framework exemplified for the ocean biogeochemical component" (Bundesministerium für Bildung und Forschung, funding period: 2015-2019)

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” (co-lead; German Science Foundation DFG, funding period: 2016 – 2019)

Publications

Number of items: 105.

Articles in a Scientific Journal - peer-reviewed

[thumbnail of os-21-1167-2025-supplement.pdf]

Guo, H., Koeve, W.

, Oschlies, A.

, He, Y. C., Kemena, T. P.

, Gerke, L. and Kriest, I.

(2025) Dual-tracer constraints on the Inverse-Gaussian Transit-time distribution improve the estimation of watermass ages and their temporal trends in the tropical thermocline.

Ocean Science, 21 (3). pp. 1167-1182. DOI 10.5194/os-21-1167-2025.

[thumbnail of J Adv Model Earth Syst - 2024 - Oliver - Using Shortened Spin‐Ups to Speed Up Ocean Biogeochemical Model Optimization.pdf]

Oliver, S., Khatiwala, S., Cartis, C., Ward, B. and Kriest, I.

(2024) Using Shortened Spin‐Ups to Speed Up Ocean Biogeochemical Model Optimization.

Journal of Advances in Modeling Earth Systems, 16 (9). Art.Nr.: e2023MS003941. DOI 10.1029/2023MS003941.

[thumbnail of Global Biogeochemical Cycles - 2024 - Getzlaff - Impacts of Vertical Migrants on Biogeochemistry in an Earth System Model.pdf]

Getzlaff, J. and Kriest, I.

(2024) Impacts of vertical migrants on biogeochemistry in an Earth system model.

Global Biogeochemical Cycles, 38 (7). e2023GB007842. DOI 10.1029/2023GB007842.

[thumbnail of J Adv Model Earth Syst - 2023 - Sauerland.pdf]

Sauerland, V., von Hallern, C., Kriest, I.

and Getzlaff, J. (2023) A CMA‐ES Algorithm Allowing for Random Parameters in Model Calibration.

Journal of Advances in Modeling Earth Systems, 15 (8). Art.Nr. e2022MS003390. DOI 10.1029/2022MS003390.

[thumbnail of 2022gl102645-sup-0001-supporting information si-s01.pdf]

Guo, H., Kriest, I.

, Oschlies, A.

and Koeve, W.

(2023) Can oxygen utilization rate be used to track the long-term changes of aerobic respiration in the mesopelagic Atlantic ocean?.

Geophysical Research Letters, 50 (13). Art.Nr. e2022GL102645. DOI 10.1029/2022GL102645.

[thumbnail of bg-20-2645-2023-supplement.pdf]

Kriest, I.

, Getzlaff, J., Landolfi, A.

, Sauerland, V., Schartau, M.

and Oschlies, A.

(2023) Exploring the role of different data types and timescales for the quality of marine biogeochemical model calibration.

Biogeosciences (BG), 20 (13). pp. 2645-2669. DOI 10.5194/bg-20-2645-2023.

Hill-Cruz, M.

, Kriest, I.

and Getzlaff, J. (2023) Diving deeper: Mesopelagic fish biomass estimates comparison using two different models.

Frontiers in Marine Science, 10 . Art.Nr. 1121569. DOI 10.3389/fmars.2023.1121569.

[thumbnail of Hill_Cruz_Frenger_2022.pdf]

Hill-Cruz, M.

, Frenger, I.

, Getzlaff, J., Kriest, I.

, Xue, T.

and Shin, Y. J. (2022) Understanding the drivers of fish variability in an end-to-end model of the Northern Humboldt Current System.

Ecological Modelling, 472 . Art.Nr. 110097. DOI 10.1016/j.ecolmodel.2022.110097.

[thumbnail of gmd_15_5987_2022_supplement.pdf]

Chien, C. T.

, Durgadoo, J. V.

, Ehlert, D., Frenger, I.

, Keller, D. P.

, Koeve, W.

, Kriest, I.

, Landolfi, A.

, Patara, L.

, Wahl, S.

and Oschlies, A.

(2022) FOCI-MOPS v1 – Integration of Marine Biogeochemistry within the Flexible Ocean and Climate Infrastructure version 1 (FOCI 1) Earth system model.

Geoscientific Model Development, 15 . pp. 5987-6024. DOI 10.5194/gmd-15-5987-2022.

Oliver, S. E., Cartis, C., Kriest, I.

, Tett, S. F. B. and Khatiwala, S. (2022) A derivative-free optimisation method for global ocean biogeochemical models.

Geoscientific Model Development, 15 . pp. 3537-3554. DOI 10.5194/gmd-15-3537-2022.

[thumbnail of bg-18-2891-2021-supplement.pdf]

Hill-Cruz, M.

, Kriest, I.

, Jose, Y. S.

, Kiko, R.

, Hauss, H.

and Oschlies, A.

(2021) Zooplankton mortality effects on the plankton community of the Northern Humboldt Current System: Sensitivity of a regional biogeochemical model.

Biogeosciences (BG), 18 (9). pp. 2891-2916. DOI 10.5194/bg-18-2891-2021.

[thumbnail of bg-17-3057-2020-supplement.pdf]

Kriest, I.

, Kähler, P., Koeve, W.

, Kvale, K. F.

, Sauerland, V. and Oschlies, A.

(2020) One size fits all? Calibrating an ocean biogeochemistry model for different circulations.

Biogeosciences (BG), 17 . pp. 3057-3082. DOI 10.5194/bg-17-3057-2020.

[thumbnail of Data_Sheet_1_Zooplankton-Mediated Fluxes in the Eastern Tropical North Atlantic.pdf]

Kiko, R.

, Brandt, P.

, Christiansen, S.

, Faustmann, J., Kriest, I.

, Rodrigues, E.

, Schütte, F. and Hauss, H.

(2020) Zooplankton-Mediated Fluxes in the Eastern Tropical North Atlantic.

Frontiers in Marine Science, 7 . Art.Nr. 358. DOI 10.3389/fmars.2020.00358.

[thumbnail of A juvenile glass squid.Credit: Woods Hole Oceanographic Institution/Paul Caiger]

Martin, A., Boyd, P., Buesseler, K., Cetinic, I., Claustre, H., Giering, S., Henson, S., Irigoien, X., Kriest, I.

, Memery, L., Robinson, C., Saba, G., Sanders, R., Siegel, D., Villa-Alfageme, M. and Guidi, L. (2020) Study the twilight zone before it is too late. Nature, 580 (7801). pp. 26-28. DOI 10.1038/d41586-020-00915-7.

[thumbnail of bg-16-3095-2019-supplement.pdf]

+1 more...

Niemeyer, D.

, Kriest, I.

and Oschlies, A.

(2019) The effect of marine aggregate parameterisations on nutrients and oxygen minimum zones in a global biogeochemical model.

Biogeosciences (BG), 16 . pp. 3095-3111. DOI 10.5194/bg-16-3095-2019.

[thumbnail of Sauerland_et_al-2019-Journal_of_Advances_in_Modeling_Earth_Systems.pdf]

Sauerland, V.

, Kriest, I.

, Oschlies, A.

and Srivastav, A. (2019) Multiobjective Calibration of a Global Biogeochemical Ocean Model Against Nutrients, Oxygen, and Oxygen Minimum Zones.

Journal of Advances in Modeling Earth Systems, 11 (5). pp. 1285-1308. DOI 10.1029/2018MS001510.

[thumbnail of bg-14-4965-2017-supplement.pdf]

Kriest, I.

(2017) Calibration of a simple and a complex model of global marine biogeochemistry.

Biogeosciences (BG), 14 . pp. 4965-4984. DOI 10.5194/bg-14-4965-2017.

+5 more...

Kiko, R.

, Biastoch, A.

, Brandt, P.

, Cravatte, S., Hauss, H.

, Hummels, R., Kriest, I.

, Marin, F., McDonnell, A. M. P., Oschlies, A.

, Picheral, M., Schwarzkopf, F. U.

, Thurnherr, A. M. and Stemmann, L. (2017) Biological and physical influences on marine snowfall at the equator. Nature Geoscience, 10 (11). pp. 852-858. DOI 10.1038/ngeo3042.

Kvale, K. F.

, Khatiwala, S., Dietze, H.

, Kriest, I.

and Oschlies, A.

(2017) Evaluation of the Transport Matrix Method for simulation of ocean biogeochemical tracers.

Geoscientific Model Development, 10 . pp. 2425-2445. DOI 10.5194/gmd-10-2425-2017.

Schartau, M.

, Wallhead, P., Hemmings, J., Löptien, U.

, Kriest, I.

, Krishna, S., Ward, B. A., Slawig, T. and Oschlies, A.

(2017) Reviews and syntheses: Parameter identification in marine planktonic ecosystem modelling.

Biogeosciences (BG), 14 (6). pp. 1647-1701. DOI 10.5194/bg-14-1647-2017.

[thumbnail of gmd-10-127-2017-supplement.zip]

Kriest, I.

, Sauerland, V., Khatiwala, S., Srivastav, A. and Oschlies, A.

(2017) Calibrating a global three-dimensional biogeochemical ocean model (MOPS-1.0).

Geoscientific Model Development, 10 . pp. 127-154. DOI 10.5194/gmd-10-127-2017.

Schwinger, J., Goris, N., Tjiputra, J. F., Kriest, I.

, Bentsen, M., Bethke, I., Ilicak, M., Assmann, K. M. 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, 9 . pp. 2589-2622. DOI 10.5194/gmd-9-2589-2016.

[thumbnail of grl54594-sup-0001-supplementary.pdf]

Keller, D. P.

, Kriest, I.

, Koeve, W.

and Oschlies, A.

(2016) Southern Ocean biological impacts on global ocean oxygen.

Geophysical Research Letters, 43 (12). pp. 6469-6477. DOI 10.1002/2016GL069630.

[thumbnail of gmd-8-2929-2015-supplement.zip]

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.

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.

Kriest, I.

and Oschlies, A.

(2013) Swept under the carpet: organic matter burial decreases global ocean biogeochemical model sensitivity to remineralization length scale.

Biogeosciences (BG), 10 . pp. 8401-8422. DOI 10.5194/bg-10-8401-2013.

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.

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.

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.

[thumbnail of KRIEST_&_OSCHLIES_2011.pdf]

Kriest, I.

and Oschlies, A.

(2011) Numerical effects on organic-matter sedimentation and remineralization in biogeochemical ocean models. Ocean Modelling, 39 (3-4). pp. 275-283. DOI 10.1016/j.ocemod.2011.05.001.

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.

Heinze, C., Kriest, I.

and Maier-Reimer, E. (2009) Age offsets among different biogenic and lithogenic components of sediment cores revealed by numerical modeling.

Paleoceanography, 24 (4). PA4214. DOI 10.1029/2008PA001662.

[thumbnail of 631_Paulmier_2009_StoichiometriesOfRemineralisationAndDenitrification_Artzeit_pubid11973.pdf]

Paulmier, A., Kriest, I.

and Oschlies, A.

(2009) Stoichiometries of remineralisation and denitrification in global biogeochemical ocean models.

Biogeosciences (BG), 6 . pp. 923-935.

[thumbnail of 24_Kriest_2008_OnTheTreatmentOfParticulate_Artzeit_pubid8800.pdf]

Kriest, I.

and Oschlies, A.

(2008) On the treatment of particulate organic matter sinking in large-scale models of marine biogeochemical cycles.

Biogeosciences (BG), 5 . pp. 55-72. DOI 10.5194/bg-5-55-2008.

[thumbnail of Modelling the effect of cell-size-dependent.pdf]

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.

(2002) Different parameterizations of marine snow in a 1D-model and their influence on representation of marine snow, nitrogen budget and sedimentation. Deep Sea Research Part I: Oceanographic Research Papers, 49 (12). pp. 2133-2162. DOI 10.1016/S0967-0637(02)00127-9.

[thumbnail of Kriest-Evans2000_Article_AVerticallyResolvedModelForPhy.pdf]

Kriest, I.

and Evans, G. (2000) A vertically resolved model for phytoplankton aggregation.

Proceedings of the Indian Academy of Sciences (Earth Planet. Sci.), 109 (4) . pp. 453-469.

[thumbnail of 1-s2.0-S0967063799000321-main.pdf]

Kriest, I.

and Evans, G. (1999) Representing phytoplankton aggregates in biogeochemical models. Deep Sea Research Part I: Oceanographic Research Papers, 46 . pp. 1841-1859. DOI 10.1016/S0967-0637(99)00032-1.

Book chapters

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

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

Hill-Cruz, M.

, Frenger, I.

, Kriest, I.

, Getzlaff, J., Xue, T.

and Shin, Y. (2022) Habitat impact on the interannual variability of fish in the northern Humboldt Current System. [Talk] In: Small Pelagic Fish: New Frontiers in Science for Sustainable Management. , 07.-11.11.2022, Lisbon, Portugal .

Hill Cruz, M.

, Kriest, I.

and Getzlaff, J. (2022) How to model mesopelagic fish? Inter-comparison of two modelling approaches. [Talk] In: Ocean Sciences Meeting 2022. , 24.02.-04.03-2022, Online .

Kriest, I.

, Kähler, P., Khatiwala, S., Koeve, W.

, Kvale, K. F.

, Sauerland, V. and Oschlies, A.

(2020) One size fits all? - Optimising ocean biogeochemistry for different circulations. [Talk] In: Ocean Sciences Meeting 2020. , 16.-21.02.2020, San Diego, USA .

Prowe, A. E. F.

and Kriest, I.

(2020) Plankton temperature dependence in ocean biogeochemical models. [Talk] In: Ocean Sciences Meeting 2020. , 16.-21.02.2020, San Diego, USA .

Hill Cruz, M.

, Kriest, I.

, Jose, Y. S.

and Oschlies, A.

(2019) Zooplankton mortality effects on the planktonic ecosystem of the upwelling system off Peru: A regional biogeochemical modelling approach. [Talk] In: Association for the Sciences of Limnology and Oceanography (ASLO) 2019 Aquatic Sciences Meeting. , 23.02.-02.03.2019, San Juan, Puerto Rico .

Kriest, I.

, Sauerland, V. and Oschlies, A.

(2018) As good as it gets: Fitting a global biogeochemical model to oxygen minimum zones. [Talk] In: Ocean Deoxygenation: Drivers and Consequences - Past/Present/Future. International Conference. , 03.-07.09.2018, Kiel, Germany .

Kriest, I.

, Sauerland, V. and Oschlies, A.

(2018) Parameter optimization helps to shed light on the role of ocean biota for oxygen and nitrogen cycles. [Invited talk] In: Kiel Symposium on Discrete Algorithms and their Applications in Marine-and Life Sciences – An Indo-German Perspective. , 12.-14.09.2018, Kiel, Germany .

Kriest, I.

(2017) Global biogeochemical model optimization - how good can we get, and what does "good" mean?. [Invited talk] In: BCCR/GFI Seminar (Bjerksnes Centre). , 10.05.2017, Bergen, Norway .

Kriest, I.

(2017) Some aspects of modeling mesopelagic particle flux on a global scale (and on long time scales). [Invited talk] In: Workshop on Biological Carbon Pump Programmes. , 18.-20.10.2017, IUEM, Plouzané (Brest), France .

Kriest, I.

, Dietze, H.

, Löptien, U.

and Schartau, M.

(2017) Calibration and parameter identification of global marine biogeochemistry models. [Talk] In: PalMod Annual Retreat. , 22.02.2017, Lübeck, Germany .

Oschlies, A.

, Koeve, W.

, Landolfi, A.

, Getzlaff, J., Somes, C. J.

and Kriest, I.

(2016) Patterns of deoxygenation – natural and anthropogenic drivers. [Talk] In: Ocean Sciences Meeting 2016. , 21.-26.02.2016, New Orleans, USA .

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

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 .

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 .

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

Kriest, I.

and Oschlies, A.

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

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

Hill Cruz, M.

, Kriest, I.

and Jose, Y. S.

(2021) Parameterisation of fish variability effects on biogeochemistry through zooplankton mortality: A sensitivity study for the Eastern Tropical South Pacific. [Poster] In: Advances in Marine Ecosystem Modelling Research (AMEMR) Virtual Conference 2021. , 12.-15.07.2021, Online .

Prowe, A. E. F.

and Kriest, I.

(2018) As you like it: 3D global model sensitivity to temperature formulations during warming. [Poster] In: OCB Summer Workshop 2018. , 25.-28.06.2018, Woods Hole, Ma, USA .

Roth, C., Duteil, O.

and Kriest, I.

(2018) Sensitivity of the oxygen levels to the CORE-II and JRA55 forcing dataset in a high resolution model of the tropical Atlantic Ocean. [Poster] In: Oxygen Deoxygenation Conference 2018. , 03.-07.09.2018, Kiel, Germany .

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 .

von Bröckel, K., Sellmer, C. and Kriest, I.

(2000) Silicate limitation in a filament.

[Poster] In: Biogeochemical Cycles: German contribution to International JGOFS. , 18.-21.09.2000, Bremen, Germany . Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen. ; pp. 32-33 .

Theses - published by a publisher

Kriest, I.

(1999) The influence of phytoplankton aggregation on sedimentation - A model study.

(PhD/ Doctoral thesis), 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.

Theses - not published by a publisher

[thumbnail of Abstract and short version]

Kriest, I.

(2019) Towards integrated assessment and calibration of global biogeochemical ocean models. (Professorial dissertation), Christian-Albrechts-Universität Kiel, Kiel, Germany, 246 pp.

Kriest, I.

(1994) Auswirkungen wachstumsbeeinflussender Faktoren auf den Phytoplanktonjahreszyklus : Vergleich von Modellierung und Daten. (Diploma thesis), Christian-Albrechts-Universität, Kiel, Kiel, Germany, 107 pp.

Reports - Cruise Reports

[thumbnail of awi_doi~10.2312_cr_m158.pdf]

Brandt, P.

, Begler, C., Coelho, P., Czeschel, R., Dennert, P., Fernandez Carrera, A., Filella, A., Gindorf, S., Gomez-Letona, M., Hans, A. C., Heukamp, F., Kiko, R.

, Kisjeloff, B., Imbol Koungue, R. A., Kriest, I.

, Martens, W., Prigent, A.

, Ramcharitar, B., Sarmiento Lezcano, A. N., Schmidtko, S.

, Schrandt, J. C., Sherman, J., Stelzner, M., Stöven, T.

, Subramaniam, A. and Tuchen, F. P.

(2019) Trans-Atlantic Equatorial cruise I, Cruise No. M158, September 19 - October 26, 2019, Walvis Bay (Namibia) - Recife (Brazil).

. METEOR-Berichte, M158 . Gutachterpanel Forschungsschiffe, Bremen, Germany, 48 pp. DOI 10.2312/cr_m158.

Reports - other reports

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 = Berichte zur Erdsystemforschung, 14 . Max-Planck-Institute for Meteorology, Hamburg, 50 pp.

This list was generated on Fri Nov 7 19:37:32 2025 CET.