@phdthesis{Koehler1998,
  author    = {K{\"o}hler, Torsten},
  title     = {Effiziente Algorithmen f{\"u}r die Optimierung der Therapie-Planung zur regionalen Hyperthermie},
  address   = {Potsdam},
  pages     = {91 S. : graph. Darst.},
  year      = {1998},
  language  = {de}
}
@book{Koehler1996,
  author    = {K{\"o}hler, Torsten},
  title     = {Zur Antennensteuerung bei der Hyperthermie-Behandlung},
  series = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik},
  volume    = {1996, 12},
  journal   = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik},
  publisher = {Univ.},
  address   = {Potsdam},
  year      = {1996},
  language  = {de}
}
@article{PirliHainzlSchweitzeretal.2018,
  author    = {Pirli, Myrto and Hainzl, Sebastian and Schweitzer, Johannes and K{\"o}hler, Andreas and Dahm, Torsten},
  title     = {Localised thickening and grounding of an Antarctic ice shelf from tidal triggering and sizing of cryoseismicity},
  series = {Earth \& planetary science letters},
  volume    = {503},
  journal   = {Earth \& planetary science letters},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0012-821X},
  doi       = {10.1016/j.epsl.2018.09.024},
  pages     = {78 -- 87},
  year      = {2018},
  abstract  = {We observe remarkably periodic patterns of seismicity rates and magnitudes at the Fimbul Ice Shelf, East Antarctica, correlating with the cycles of the ocean tide. Our analysis covers 19 years of continuous seismic recordings from Antarctic broadband stations. Seismicity commences abruptly during austral summer 2011 at a location near the ocean front in a shallow water region. Dozens of highly repetitive events occur in semi-diurnal cycles, with magnitudes and rates fluctuating steadily with the tide. In contrast to the common unpredictability of earthquake magnitudes, the event magnitudes show deterministic trends within single cycles and strong correlations with spring tides and tide height. The events occur quasi-periodically and the highly constrained event sources migrate landwards during rising tide. We show that a simple, mechanical model can explain most of the observations. Our model assumes stick-slip motion on a patch of grounded ice shelf, which is forced by the variations of the ocean-tide height and ice flow. The well fitted observations give new insights into the general process of frictional triggering of earthquakes, while providing independent evidence of variations in ice shelf thickness and grounding.},
  language  = {en}
}
@article{KoebschWinkelLiebneretal.2019,
  author    = {Koebsch, Franziska and Winkel, Matthias and Liebner, Susanne and Liu, Bo and Westphal, Julia and Schmiedinger, Iris and Spitzy, Alejandro and Gehre, Matthias and Jurasinski, Gerald and K{\"o}hler, Stefan and Unger, Viktoria and Koch, Marian and Sachs, Torsten and B{\"o}ttcher, Michael E.},
  title     = {Sulfate deprivation triggers high methane production in a disturbed and rewetted coastal peatland},
  series = {Biogeosciences},
  volume    = {16},
  journal   = {Biogeosciences},
  number    = {9},
  publisher = {Copernicus},
  address   = {G{\"o}ttingen},
  issn      = {1726-4170},
  doi       = {10.5194/bg-16-1937-2019},
  pages     = {1937 -- 1953},
  year      = {2019},
  abstract  = {In natural coastal wetlands, high supplies of marine sulfate suppress methanogenesis. Coastal wetlands are, however, often subject to disturbance by diking and drainage for agricultural use and can turn to potent methane sources when rewetted for remediation. This suggests that preceding land use measures can suspend the sulfate-related methane suppressing mechanisms. Here, we unravel the hydrological relocation and biogeochemical S and C transformation processes that induced high methane emissions in a disturbed and rewetted peatland despite former brackish impact. The underlying processes were investigated along a transect of increasing distance to the coastline using a combination of concentration patterns, stable isotope partitioning, and analysis of the microbial community structure. We found that diking and freshwater rewetting caused a distinct freshening and an efficient depletion of the brackish sulfate reservoir by dissimilatory sulfate reduction (DSR). Despite some legacy effects of brackish impact expressed as high amounts of sedimentary S and elevated electrical conductivities, contemporary metabolic processes operated mainly under sulfate-limited conditions. This opened up favorable conditions for the establishment of a prospering methanogenic community in the top 30-40 cm of peat, the structure and physiology of which resemble those of terrestrial organic-rich environments. Locally, high amounts of sulfate persisted in deeper peat layers through the inhibition of DSR, probably by competitive electron acceptors of terrestrial origin, for example Fe(III). However, as sulfate occurred only in peat layers below 30-40 cm, it did not interfere with high methane emissions on an ecosystem scale. Our results indicate that the climate effect of disturbed and remediated coastal wetlands cannot simply be derived by analogy with their natural counterparts. From a greenhouse gas perspective, the re-exposure of diked wetlands to natural coastal dynamics would literally open up the floodgates for a replenishment of the marine sulfate pool and therefore constitute an efficient measure to reduce methane emissions.},
  language  = {en}
}