Dr. Makan Karegar

Dr. Makan Karegar

Berufliches Profil

• Jan. 2022 - Present: Member of Collaborative Research Centre 1502, sfb1502.de.

• Aug. 2018 - Present: Research Associate at the Institute of Geodesy and Geoinformation (Astronomical Physical and Mathematical Geodesy Group), University of Bonn.

• Jun. 2018: Ph.D. in Geology, School of Geosciences, University of South Florida, Tampa, USA.

• Jun. 2016 - Aug. 2018: Visiting Researcher at the Institute of Geodesy and Geoinformation (Astronomical Physical and Mathematical Geodesy Group), University of Bonn.

• Aug. 2012 - Aug. 2018 : Doctoral student in Geosciences, University of South Florida, School of Geosciences, Tampa, USA.

• Oct. 2006 - Aug. 2009: M.Sc. in Geodesy, Khajeh Nasir Toosi University of Technology, Faculty of Geodesy and Geomatics Engineering, Tehran, Iran.

Forschungsinteressen

• Earth's surface deformation and its interactions with human activities and climate changes

• Regional sea-level rise
  

• Global Navigation Satellite System (GNSS)

Auszeichnungen

• Fellowship: NASA Earth Surface Interior Program (2015-2018):  Integrating GRACE, surface deformation from InSAR, GPS, and land surface models to investigate hydrological signal. Award to University of South Florida, Tampa, USA. 

• Argelander Starter-Kit Grant (2021-2023): Argelander Program for Early-Career Researchers - Reaching for the Stars, The University of Bonn.

• The Winner of Ideas Competition at the University of Bonn (2022).

Lehre

Publications 

• Sefton, J., Kemp, A.C., Engelhart, S., Ellison, J.C., Karegar, M.A., Charley, B., McCoy, M.D. (2022). Implications of Anomalous Relative Sea-level Rise for the peopling of Remote Oceania, Proceedings of National Academy of Sciences, 119 (52), e2210863119, https://doi.org/10.1073/pnas.2210863119

• Karegar, M.A., Kusche, J., Nievinski, F.G., Larson, K.M. (2022). Raspberry Pi Reflector (RPR): a Low-cost Water-level Monitoring System based on GNSS Interferometric Reflectometry, Water Resources Research, 58, e2021WR031713, https://doi.org/10.1029/2021WR031713

• Karegar, M.A., Kusche, J. (2020). Imprints of COVID‐19 Lockdown on GNSS Observations: An Initial Demonstration Using GNSS Interferometric Reflectometry. Geophysical Research Letters, 47 (19), doi.org/10.1029/2020GL089647.

• Karegar, M.A., Larson, K.M., Kusche, J., Dixon., T.H. (2020). Novel quantification of shallow sediment compaction by GPS interferometric reflectometry and implications for flood susceptibility, Geophysical Research Letters, 47(14), e2020GL087807. https://doi.org/10.1029/2020GL087807

• Klos, A., Karegar, M.A., Kusche, J., Springer, A. (2020). Quantifying noise in daily GPS height time series: harmonic function versus GRACE-assimilating modeling approaches, IEEE Geoscience and Remote Sensing Letters, doi: 10.1109/LGRS.2020.2983045

• Springer, A., Karegar, M.A., Kusche, J., Kurtz, W., Keune, J., Kollet, S. (2019). Evidence of daily hydrological loading in GPS time series over Europe. Journal of Geodesy, 93(10), 2145-2153, https://doi.org/10.1007/s00190-019-01295-1

• Karegar, M.A. (2018). Theory and Application of Geophysical Geodesy for Studying Earth's Surface Deformation. Graduate Theses and Dissertations, School of Geosciences, University of South Florida, Tampa, USA, P. 242, June 2018. https://scholarcommons.usf.edu/etd/7255

• Karegar, M.A., Dixon, T. H., Kusche, J., Chambers, D. P. (2018). A new hybrid method for estimating hydrologically induced vertical deformation from GRACE and a hydrological model: An example from Central North America. Journal of Advances in Modeling Earth Systems, 10. doi.org/10.1029/2017MS001181

• Karegar, M.A., Dixon, T., Malservisi, R., Kusche, J., Engelhart, S. (2017) Nuisance Flooding and Relative Sea-Level Rise: the Importance of Present-Day Land Motion. Nature Scientific Reports, 7, doi.10.1038/s41598-017-11544-y

• Dixon T.H., Karegar M.A. (2017). Coastal Subsidence: Harbinger of Future Flooding?, Speaking of Geoscience, The Geological Society of America’s Guest blog

• Karegar, M.A., Dixon, T.H., & Engelhart, S.E. (2016). Subsidence along the Atlantic Coast of North America: Insights from GPS and late Holocene relative sea level data. Geophysical Research Letters, 43(7), 3126-3133. doi:10.1002/2016GL068015

• Karegar, M.A., Dixon, T.H., & Malservisi, R. (2015). A three-dimensional surface velocity field for the Mississippi Delta: Implications for coastal restoration and flood potential. Geology, 43(6), 519-522. doi:G36598.1

• Karegar, M.A., Dixon, T.H., Malservisi, R., Yang, Q., Hossaini, S.A., & Hovorka, S.D. (2015). GPS-based monitoring of surface deformation associated with CO 2 injection at an enhanced oil recovery site. International Journal of Greenhouse Gas Control, 41, 116-126. doi: https://doi.org/10.1016/j.ijggc.2015.07.006

• Marshall, A., Connor, C., Kruse, S., Malservisi, R., Richardson, J., Courtland, L., ... & Karegar, M.A. (2015). Subsurface structure of a maar–diatreme and associated tuff ring from a high-resolution geophysical survey, Rattlesnake Crater, Arizona. Journal of Volcanology and Geothermal Research, 304, 253-264. doi: https://doi.org/10.1016/j.jvolgeores.2015.09.006

• Eshagh, M., & Karegar, M.A. (2012). Software for generating gravity gradients using a geopotential model based on an irregular semivectorization algorithm. Computers & geosciences, 39, 152-160. doi: https://doi.org/10.1016/j.cageo.2011.06.003

• Karegar, M.A., & Alamdari, M. (2011). Application of Molodensky's Method for Precise Determination of Geoid in Iran. Journal of Geodetic Science, 1(3), 259-270.  doi: https://doi.org/10.2478/v10156-011-0004-0

• Eshagh, M., & Karegar, M.A. (2010). Semi-vectorization: an efficient technique for synthesis and analysis of gravity gradiometry data. Earth Science Informatics, 3(3), 149-158. doi: s12145-010-0062-3

• Eshagh, M., & Karegar, M.A. (2009). The effect of geopotential perturbations of GOCE on its observations-A numerical study. Acta Geodaetica et Geophysica Hungarica ,  44 (4), 385-398. doi: AGeod.44.2009.4.2

• Eshagh, M., Karegar, M.A. , & Najafi-Alamdari, M. (2008). Simplification of geopotential perturbing force acting on a satellite. Artificial Satellites ,  43 (2), 45-64. doi: https://doi.org/10.2478/v10018-009-0006-7

Selected featured research in public media

• "Unter Brücken und im Weltraum – Die neue Ära der GNSS-Reflektometrie passt in einen Schuhkarton ", Zeitschrift für Geodäsie, Geoinformation und Landmanagement, Januray (2023).

• "Ein neues Gerät misst, ob alles im Fluss bleibt", General-Anzeiger, Januray 8 (2023).
  

• "Low-cost sensor records the level of rivers", Press at the University of Bonn, ScienceDaily, November 23 (2022).

• "Flood risks: More accurate data due to Covid-19", Press at the University of Bonn, EurekAlert | AAAS, ScienceDaily, September 23 (2020).

• Dirmeyer P., "Bulging, Shrinking, and Deformation of Land by Hydrologic Loading", American Geophysical Union, Earth and Space Science News (Eos), Editors’ Highlights for Karegar et al. (2018), June 19 (2018).

• Schifman L., "Sea-Level Rise & the State of Sinking: A Brief Discussion of Land Subsidence Factors in the US", envirobites, December 3 (2018).

• Cartier K., "Playing with Water: Humans Are Altering Risk of Nuisance Floods", Interview with Earth and Space Science News (EOS), 98, American Geophysical Union,  September 28 (2017).

• Radford T., "US faces higher risk of floods", Climate News Network, September 25 (2017).

• "Oostkust VS zinkt langzaam onder water", De Morgen, September 13 (2017).

• "The USA Threatened by More Frequent Flooding", Interview with Press at the University of Bonn and Spiegel Magazine, September 11 (2017).

• "Jedes Jahr drei Millimeter – US-Ostküste versinkt langsam im Meer", Die Welt, September 11 (2017).

• Frischkorn K.,  "What Are All The Ways That Land Can Disappear Beneath Your Feet?" Smithsonian, June 29 (2017).

• Dixon T.H., Karegar M.A., "Coastal Subsidence: Harbinger of Future Flooding?", Speaking of Geoscience, The Geological Society of America’s Guest blog, February 22 (2017).

• Rowan L., "Subsiding Atlantic Coast Due to Geologic Adjustment and Groundwater Extraction", Geodetic Science Snapshot, UNAVCO, Novembe, 28 (2016).

• Upton. J., "Sinking Atlantic Coastline Meets Rapidly Rising Seas", Climate Central, April 14 (2016).

• "Engineering a better future for the Mississippi Delta", PHYS.ORG, EurekAlert | AAAS, ScienceDaily, Geological Socity of America, April 28 (2015).  

Past and current students

BSc thesis:

• Nadja Jonas (2019, Concepts for Retrieving Sea-level Change from GPS Interferometric Reflectometry)
• Carolin Köß (2021, Analysing Seismic Signals Collected by the Raspberry Shake in Todenfeld, Germany)

MSc thesis:

• Christian Mielke (2021, The Quantification of Drought and Water Loss using GNSS)
• Waruna Don (2021, How fast are Western Tropical Pacific Islands uplifting? Geodetic constraints from GPS, Satellite Altimetry and Tide Gauge)
• Mingyao Li (2022, AVGR: A Python-based Framework for Estimating Linear Rate Uncertainty in Geodetic Time Series using Allan Variance)
• Meryem Aydin (2022, From Static GNSS Positioning to Measuring Flooding)
• Alonso Vega Fernandez (2022, GNSS-IR)
• Sree Ram R. Krishnan (2023, InSAR Observation of Subsiding Islands)

PhD students: 

• Soran Parang (2020 - present, Co-supervisor: Towards an improved understanding of vertical land motion and sea-level change in eastern North America). Department of Earth and Environmental Sciences, University of Ottawa, Canada.
• Artur Fischer (2022/6 - 2022/8, Supervising research visit: Real-time monitoring of river level with a low-cost GNSS receiver). Department of Geodesy, University of Warmia and Mazury in Olsztyn, Poland.

Student assistant(s):

• Waruna Don (2021, 1. Compiling Sediment Compaction Data. 2. Assembling RPR Sensors)
• Sree Ram R. Krishnan (2022, SWOT for river hydrology)
• Simran Suresh (2022, SWOT for river hydrology)