Dr. Robert Ladwig

Dr. Robert Ladwig

Aquatic Ecosystem Modeling, Physical Limnology and Freshwater Ecology

Publications

Multi-model projections of future evaporation in a sub-tropical lak

Published in Journal of Hydrology, 2022

In this study, we present such multi-model analysis, where five lake models forced by four different climate model projections are used to simulate historic and future change (1901–2099) in lake evaporation.

Recommended citation: La Fuente, S., Jennings, E., Gal, G., Kirillin, G., Shatwell, T., Ladwig, R., Moore, T., Couture, R.-M.,, Côté, M., Vinnå, C.L.R., Woolway, R.I. (2022): "Multi-model projections of future evaporation in a sub-tropical lake" Journal of Hydrology, doi https://doi.org/10.1016/j.jhydrol.2022.128729 https://doi.org/10.1016/j.jhydrol.2022.128729

Hacking Limnology Workshop and DSOS22: Creating a Community of Practice for the Nexus of Data Science, Open Science, and the Aquatic Sciences

Published in Limnology and Oceanography Bulletin, 2022

The 2nd Aquatic Ecosystem Modeling-Junior (AEMON-J) Hacking Limnology Workshop and 3rd Virtual Summit: Incorporating Data Science and Open Science in the Aquatic Sciences (DSOS) took place on 25–29 July 2022.

Recommended citation: Meyer, M., Barbosa, C.C., Ladwig, R., Mesman, J.P., Borekci, N.S., Cawley, K., Feldbauer, J., Oleksy, I.A., Pilla, R.M., Tran, P.Q., Zwart, J.A., Schnedler-Meyer, N.A., Andersen, T.K., Brousil, M.R., Fickas, K.C., Filazzola, A., King, T.V., Sanchez-Lopez, N., Stengel, V., Trolle, D. (2022): "Hacking Limnology Workshop and DSOS22: Creating a Community of Practice for the Nexus of Data Science, Open Science, and the Aquatic Sciences" Limnology and Oceanography Bulletin, doi https://doi.org/10.1002/lob.10525 https://doi.org/10.1002/lob.10525

Ensemble of models shows coherent response of a reservoir’s stratification and ice cover to climate warming

Published in Aquatic Sciences, 2022

We used an ensemble of vertical one-dimensional hydrodynamic lake models driven with regional climate projections to calculate water temperature, stratification, and ice cover under the A1B emission scenario for the German drinking water reservoir Lichtenberg.

Recommended citation: Feldbauer, J., Moore, T.N., Mesman, J., Ladwig, R., Berendonk, T., Zündorf, H., Petzoldt, T. (2022): "Ensemble of models show coherent response of a reservoirs stratification and ice cover to climate warming" Aquatic Sciences, doi https://doi.org/10.1007/s00027-022-00883-2 https://doi.org/10.1007/s00027-022-00883-2

Long-term change in metabolism phenology in north temperate lakes

Published in Limnology and Oceanography, 2022

We developed a Bayesian modeling framework to estimate DO concentrations and metabolism in eight lakes in contrasting landscapes in Wisconsin, USA. We identify the DO and metabolism phenologies for each lake, and use those to compare how decadal patterns relate to trophic state and landscape setting.

Recommended citation: Ladwig R., Appling A., Delany A., Dugan H., Gao Q., Lottig N., Stachelek J., Hanson P. (2022): "Long-term change in metabolism phenology in north temperate lakes" Limnology and Oceanography, doi https://doi.org/10.1002/lno.12098 https://doi.org/10.1002/lno.12098

A framework for ensemble modelling of climate change impacts on lakes worldwide: the ISIMIP Lake Sector

Published in Geoscientific Model Development, 2022

We describe a simulation protocol developed by the Lake Sector of the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP) for simulating climate change impacts on lakes using an ensemble of lake models and climate change scenarios for ISIMIP phases 2 and 3..

Recommended citation: Golub, M., Thiery, W., Marce, R., Pierson, D., Vanderkelen, I., Mercado, D., Woolway, R.I., Grant, L., Jennings, E., Schewe, J., Zhao, F., Frieler, K., Mengel, M., Bogomolov, V.Y., Bouffard, D., Couture, R.-M., Debolskiy, A.V., Droppers, B., Gal, G., Guo, M., Janssen, A.B.G.,, Kirillin, G., Ladwig, R., Magee, M., Moore, T., Perroud, M., Piccolroaz, S., Raaman Vinaa, L., Schmid, M., Shatweel, T., Stepanenko, V.M., Tan, Z., Yao, H., Adrian, R., Allan, M., Anneville, O., Arvola, L., Atkins, K., Boegman, L., Carey, C., Christianson, K., de Eyto, E., DeGasperi, C., Grechushnikova, M., Hejzlar, J., Joehnk, K., Jones, I.D., Laas, A., Mackay, E.B., Mammarella, I., Markensten, H., McBride, C., Özkundakci, D., Potes, M., Rinke, K., Robertson, D., Rusak, J., Salgado, R., van den Linden, L., Verburg, P., Wain, D., Ward, N.K., Wollrab, S., Zdorovennova, G. (2022): "A framework for ensemble modelling of climate change impacts on lakes worldwide: the ISIMIP Lake Sector" Geoscientific Model Development, doi [https://doi.org/10.1002/lno.12098](https://doi.org/10.5194/gmd-15-4597-2022)https://doi.org/10.5194/gmd-15-4597-2022 [https://doi.org/10.1002/lno.12098](https://doi.org/10.5194/gmd-15-4597-2022)

Integrating periphyton and surface water–groundwater methods to understand lake ecosystem processes

Published in Limnology and Oceanography Methods, 2021

We (1) propose how to overcome barriers associated with studying littoral ecological-hydrological dynamics; (2) summarize field, laboratory, and modeling techniques for assessing spatiotemporal periphyton patterns and benthic hydrological fluxes; and (3) identify paths for hydrological techniques to be incorporated into ecological studies, deepening our understanding of whole-lake ecosystem function.

Recommended citation: Karen S. Atkins, Thomas P. Shannon, Michael F. Meyer, Isabella A. Oleksy, Nicholas T. Framsted, Deviyani Gurung, Robert Ladwig (2021): "Integrating periphyton and surface water–groundwater methods to understand lake ecosystem processes" Limnology and Oceanography Methods, doi https://doi.org/10.1002/lom3.10467 https://doi.org/10.1002/lom3.10467

The AEMON-J “Hacking Limnology” Workshop Series & Virtual Summit: Incorporating Data Science and Open Science in Aquatic Research

Published in Limnology and Oceanography Bulletin, 2021

Following the 2020 Virtual Summit: Incorporating Data Science and Open Science in Aquatic Research, a grassroots group of scientists convened the 2nd Virtual DSOS Summit on 22–23 July 2021. DSOS combined forces with the Aquatic Ecosystem MOdeling Network - Junior (AEMON-J) to host a 4-d Hacking Limnology Workshop Series prior to the summit (13–16 July 2021).

Recommended citation: Michael F. Meyer, Robert Ladwig, Jorrit P. Mesman, Isabella A. Oleksy, Carolina C. Barbosa, Kaelin M. Cawley, Alli N. Cramer, Johannes Feldbauer, Patricia Q. Tran, Jacob A. Zwart, Gregorio A. Lopez Moreira M., Muhammed Shikhani, Deviyani Gurung, Robert T. Hensley, Elena Matta, Ryan P. McClure, Thomas Petzoldt, Nuria Sanchez-Lopez, Karline Soetaert, Mridul K. Thomas,Simon N. Topp, Xiao Yang (2021) The AEMON-J “Hacking Limnology” Workshop Series & Virtual Summit: Incorporating Data Science and Open Science in Aquatic Research. Limnology and Oceanography Bulletin. https://doi.org/10.1002/lob.10475 https://doi.org/10.1002/lob.10475

Impact of salinization on lake stratification and spring mixing

Published in Limnology and Oceanography Letters, 2021

Around the world, freshwater lakes are increasing in salinity due to salt pollution. High salt concentrations can harm freshwater organisms but also can stabilize lake water columns because saline water is denser than freshwater. In a worst case scenario, salinization can prevent the ecologically important spring turnover event of the water column. Using multiple approaches, we found that increased winter salt loading will delay spring turnover, prolong summer stratification, and increase water column stability during spring, summer, and winter in north temperate lakes.

Recommended citation: Ladwig R., Rock L.A., Dugan H.A. (2021): "Impact of salinization on lake stratification and spring mixing" Limnology and Oceanography Letters, doi 10.1002/lol2.10215 https://doi.org/10.1002/lol2.10215

LakeEnsemblR: An R package that facilitates ensemble modelling of lakes

Published in Environmental Modelling & Software, 2021

We present an R package, LakeEnsemblR, that facilitates running ensembles of five different one-dimensional hydrodynamic lake models (FLake, GLM, GOTM, Simstrat, MyLake).

Recommended citation: Moore T., Mesman J., Ladwig R., Feldbauer J., Olsson F., Pilla R., Shatwell T., Venkiteswaran J., Delany A., Dugan H., Rose K., Read J. (2021): "LakeEnsemblR: An R package that facilitates ensemble modelling of lakes" Environmental Modelling & Software, doi https://doi.org/10.1016/j.envsoft.2021.105101 https://doi.org/10.1016/j.envsoft.2021.105101

Lake thermal structure drives interannual variability in summer anoxia dynamics in a eutrophic lake over 37 years

Published in Hydrology and Earth System Sciences, 2021

In this study, we used a vertical one-dimensional hydrodynamic-ecological model (GLM-AED2) coupled with a calibrated hydrological catchment model (PIHM-Lake) to simulate the thermal and water quality dynamics of the eutrophic Lake Mendota (USA) over a 37-year period to get a better understanding of inter-annual drivers of summer anoxia.

Recommended citation: Ladwig, R., Hanson, P. C., Dugan, H. A., Carey, C. C., Zhang, Y., Shu, L., Duffy, C. J., and Cobourn, K. M.: Lake thermal structure drives interannual variability in summer anoxia dynamics in a eutrophic lake over 37 years, Hydrol. Earth Syst. Sci., 25, 1009–1032, https://doi.org/10.5194/hess-25-1009-2021, 2021 https://doi.org/10.5194/hess-25-1009-2021

Virtual Growing Pains: Initial Lessons Learned from Organizing Virtual Workshops, Summits, Conferences, and Networking Events during a Global Pandemic

Published in Limnology and Oceanography Bulletin, 2021

To concentrate and synthesize the transition to conducting science virtually, we showcase how six scientific societies and communities planned, organized, and conducted virtual meetings in 2020.

Recommended citation: Michael F. Meyer, Robert Ladwig, Hilary A. Dugan, Alyssa Anderson, Abdou R. Bah, Bertram Boehrer, Lisa Borre, Rosaura J. Chapina, Chris Doyle, Elizbaeth J. Favot, Giovanna Flaim, Philip Forsberg, Paul C. Hanson, Bas W. Ibelings, Peter Isles, Fang-Pang Lin, Dendy Lofton, Tadhg N. Moore, Sara Peel, Jody A. Peters, Don Pierson, Lisette N. de Senerpont Domis, Jeffrey A. Schloss, Muhammed Shikhani, Amy P. Smagula, Jason D. Stockwell, Perry Thomas, R. Quinn Thomas, Todd Tietjen, Kathleen C. Weathers (2021) Virtual growing pains: Initial lessons learned from organizing virtual workshops, summits, conferences, and networking events during a global pandemic. Limnology and Oceanography Bulletin. https://doi.org/10.1002/lob.10431 https://doi.org/10.1002/lob.10431

Phenological shifts in lake stratification under climate change

Published in Nature Communications, 2021

We used a lake-climate model ensemble and long-term observational data, to investigate changes in lake stratification phenology across the Northern Hemisphere from 1901 to 2099.

Recommended citation: Woolway, R.I., Sharma, S., Weyhenmeyer, G.A. et al. Phenological shifts in lake stratification under climate change. Nat Commun 12, 2318 (2021). https://doi.org/10.1038/s41467-021-22657-4 https://doi.org/10.1038/s41467-021-22657-4

Future projections of water level and thermal regime changes of a multipurpose subtropical reservoir (Sao Paulo, Brazil)

Published in Science of The Total Environment, 2021

Using data generated by a regionalized climate model (RCM) as input to a simple hydrological model and a one-dimensional vertical hydrodynamic model, we forecast potential changes in the Itupararanga reservoir, São Paulo, Brazil, in an exemplary time period (2028–2030) in the next decade.

Recommended citation: Barbosa, C.C., Calijuri, M.d.C., Alves dos Santos, A.C., Ladwig, R., Amorim de Oliveira, L.F., and Buarque, A.C.S.: Future projections of water level and thermal regime changes of a multipurpose subtropical reservoir (Sao Paulo, Brazil), Science of the Total Environment, https://doi.org/10.1016/j.scitotenv.2020.144741, 2021 https://doi.org/10.1016/j.scitotenv.2020.144741

Adapting the water management to mitigate the impact of multiple stressors on an urban lake: Case study Lake Tegel (Germany)

Published in TU Berlin, 2019

This doctoral thesis explores different management options for Lake Tegel by coming field sampling, statistical analysis and numerical modeling.

Recommended citation: Ladwig R. (2019): "Adapting the water management to mitigate the impact of multiple stressors on an urban lake: Case study Lake Tegel (Germany)" TU Berlin, http://dx.doi.org/10.14279/depositonce-8289. http://dx.doi.org/10.14279/depositonce-8289

Chironomid larvae enhance phosphorus burial in lake sediments: Insights from long-term and short-term experiments

Published in Science of The Total Environment, 2019

This paper investigates the bioturbation effects by chironomid larvae on phosphorus retention.

Recommended citation: Hupfer M., Jordan S., Herzog C., Ebeling C., Ladwig R., Rothe M., Lewandowski J. (2019): "Chironomid larvae enhance phosphorus burial in lake sediments: Insights from long-term and short-term experiments" Science of The Total Environment, ISSN 0048-9697, https://doi.org/10.1016/j.scitotenv.2019.01.274. https://www.sciencedirect.com/science/article/pii/S0048969719303195

Climate Change Demands Adaptive Management of Urban Lakes: Model- Based Assessment of Management Scenarios for Lake Tegel (Berlin, Germany)

Published in Water, 2018

This paper is about the calibration of a vertical 1D hydrodynamic-water quality model (GLM-AED2) to Lake Tegel. The model was used to investigate the impact of climate change under alternative management scenarios on the lake ecosystem.

Recommended citation: Ladwig R., Furusato E., Kirillin G., Hinkelmann R., Hupfer M. (2018): "Climate Change Demands Adaptive Management of Urban Lakes: Model- Based Assessment of Management Scenarios for Lake Tegel (Berlin, Germany)" Water 10, 168, doi 10.3390/w10020186 https://www.mdpi.com/2073-4441/10/2/186

Sediment core data reconstruct the management history and usage of a heavily modified urban lake in Berlin, Germany

Published in Environ Sci Pollut Res., 2017

This paper is about the analysis of the sediment composition of an urban lake using XRF scanning and post-processing by multivariate statistical methods (PCA, k-means, SOM).

Recommended citation: Ladwig R., Heinrich L., Singer G., Hupfer M. (2017): "Sediment core data reconstruct the management history and usage of a heavily modified urban lake in Berlin, Germany" Environ Sci Pollut Res. 24: 25166-25178, doi 10.1007/s11356-017-0191-z https://link.springer.com/article/10.1007%2Fs11356-017-0191-z