@article{Leitner2002, author = {Leitner, Ulrike}, title = {"Anciennes folies neptuniennes!"}, series = {HIN : Alexander von Humboldt im Netz ; international review for Humboldtian studies}, volume = {III}, journal = {HIN : Alexander von Humboldt im Netz ; international review for Humboldtian studies}, number = {5}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {2568-3543}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-34824}, pages = {39 -- 49}, year = {2002}, abstract = {Als Humboldt sein 1804 geschriebenes Tagebuch seiner Reise von Mexico City nach Veracruz 1853 nochmals sichtete, schrieb er an den Rand einer Passage die kritischen Worte "Alte neptunistische Verr{\"u}cktheiten!" Dieser Text und seine sp{\"a}tere Randbemerkung beweisen nun endg{\"u}ltig, daß Humboldt noch gegen Ende seiner Amerikareise Neptunist war, was von Forschern oft bezweifelt worden war. Seltsamerweise hat Humboldt dieses Manuskript nicht mit in die Tageb{\"u}cher aufgenommen, als er sie gegen Ende seines Lebens in 9 Hefte neu binden ließ. Der Nachlaß Humboldts galt zusammen mit der Autographensammlung der Staatsbibliothek Berlin seit der Auslagerung im zweiten Weltkrieg als verschollen. Er befindet sich heute in Krakau, wo ich diesen Tagebuchteil vor einiger Zeit entdeckte, das nun eine wertvolle Erg{\"a}nzung zur Edition der Tageb{\"u}cher durch Margot Faak bildet. Der folgende Text stellt diesen Tagebuchteil vor und zeigt die Entwicklung einzelner Ansichten Humboldts in naturwissenschaftlichen Disziplinen, die z. T. paradigmatische Wandel von Theorien - beispielsweise in der Geologie - anzeigen.}, language = {de} } @article{Schwarz2017, author = {Schwarz, Ingo}, title = {Bernd K{\"o}lbel: Geologe und Alexander-von-Humboldt-Forscher}, series = {HiN : Alexander von Humboldt im Netz ; International Review for Humboldtian Studies}, volume = {XVIII}, journal = {HiN : Alexander von Humboldt im Netz ; International Review for Humboldtian Studies}, number = {34}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1617-5239}, doi = {10.18443/253}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-395836}, pages = {167 -- 170}, year = {2017}, abstract = {Nachruf mit Bibliographie.}, language = {de} } @phdthesis{Kaya2020, author = {Kaya, Mustafa}, title = {Cretaceous-Paleogene evolution of the proto-Paratethys Sea in Central Asia}, doi = {10.25932/publishup-48329}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-483295}, school = {Universit{\"a}t Potsdam}, pages = {iv, 237}, year = {2020}, abstract = {Unlike today's prevailing terrestrial features, the geologic past of Central Asia witnessed marine environments and conditions as well. A vast, shallow sea, known as proto-Paratethys, extended across Eurasia from the Mediterranean Tethys to the Tarim Basin in western China during Cretaceous to Paleogene times. This sea formed about 160 million years ago (during Jurassic times) when the waters of the Tethys Ocean flooded into Eurasia. It drastically retreated to the west and became isolated as the Paratethys during the Late Eocene-Oligocene (ca. 34 Ma). Having well-constrained timing and paleogeography for the Cretaceous-Paleogene proto-Paratethys sea incursions in Central Asia is essential to properly understand and distinguish the controlling mechanisms and their link to Asian paleoenvironmental and paleoclimatic change. The Cretaceous-Paleogene tectonic evolution of the Pamir and Tibet and their far-field effects play a significant role on the sedimentological and structural evolution of the Central Asian basins and on the evolution of the proto-Paratethys sea fluctuations as well. Comparing the records of the sea incursions to the tectonic and eustatic events has paramount importance to reveal the controlling mechanisms behind the sea incursions. However, due to inaccuracies in the dating of rocks (mostly continental rocks and marine rocks with benthic microfossils providing low-resolution biostratigraphic constraints) and conflicting results, there has been no consensus on the timing of the sea incursions and interpretation of their records has been in question. Here, we present a new chronostratigraphic framework based on biostratigraphy and magnetostratigraphy as well as a detailed paleoenvironmental analysis for the Cretaceous and Paleogene proto-Paratethys Sea incursions in the Tajik and Tarim basins, in Central Asia. This enables us to identify the major drivers of marine fluctuations and their potential consequences on regional and global climate, particularly Asian aridification and the global carbon cycle perturbations such as the Paleocene-Eocene Thermal Maximum (PETM). To estimate the paleogeographic evolution of the proto-Paratethys Sea, the refined age constraints and detailed paleoenvironmental interpretations are combined with successive paleogeographic maps. Regional coastlines and depositional environments during the Cretaceous-Paleogene sea advances and retreats were drawn based on the results of this thesis and integrated with existing literature to generate new paleogeographic maps. Before its final westward retreat in the Eocene, a total of six Cretaceous and Paleogene major sea incursions have been distinguished from the sedimentary records of the Tajik and Tarim basins in Central Asia. All have been studied and documented here. We identify the presence of marine conditions already in the Early Cretaceous in the western Tajik Basin, followed by the Cenomanian (ca. 100 Ma) and Santonian (ca. 86 Ma) major marine incursions far into the eastern Tajik and Tarim basins separated by a Turonian-Coniacian (ca. 92-86 Ma) regression. Basin-wide tectonic subsidence analyses imply that the Early Cretaceous invasion of the sea into the Tajik Basin is related to increased Pamir tectonism (at ca. 130 - 90 Ma) in a retro-arc basin setting inferred to be linked to collision and subduction. This tectonic event mainly governed the Cenomanian (ca. 100 Ma) sea incursion in conjunction with a coeval global eustatic high resulting in the maximum geographic extent of the sea. The following Turonian-Coniacian (ca. 92-86 Ma) major regression, driven by eustasy, coincides with a sharp slowdown in tectonic subsidence related to a regime change in Pamir tectonism from compression to extension. The Santonian (ca. 86 Ma) major sea incursion was more likely controlled dominantly by eustasy as also evidenced by the coeval fluctuations in the west Siberian Basin. During the early Maastrichtian, the global Late Cretaceous cooling is inferred from the disappearance of mollusk-rich limestones and the dominance of bryozoan-rich and echinoderm-rich limestones in the Tajik Basin documenting the first evidence for the Late Cretaceous cooling event in Central Asia. Following the last Cretaceous sea incursion, a major regional restriction event, marked by the exceptionally thick (≤ 400 m) shelf evaporites is assigned a Danian-Selandian age (ca. 63-59 Ma). This is followed by the largest recorded proto-Paratethys sea incursion with a transgression estimated as early Thanetian (ca. 59-57 Ma) and a regression within the Ypresian (ca. 53-52 Ma). The transgression of the next incursion is now constrained as early Lutetian (ca. 47-46 Ma), whereas its regression is constrained as late Lutetian (ca. 41 Ma) and is associated with a drastic increase in both tectonic subsidence and basin infilling. The age of the final and least pronounced sea incursion restricted to the westernmost margin of the Tarim Basin is assigned as Bartonian-Priabonian (ca. 39.7-36.7 Ma). We interpret the long-term westward retreat of the proto-Paratethys Sea starting at ca. 41 Ma to be associated with far-field tectonic effects of the Indo-Asia collision and Pamir/Tibetan plateau uplift. Short-term eustatic sea level transgressions are superimposed on this long-term regression and seem coeval with the transgression events in the other northern Peri-Tethyan sedimentary provinces for the 1st and 2nd Paleogene sea incursions. However, the last Paleogene sea incursion is interpreted as related to tectonism. The transgressive and regressive intervals of the proto-Paratethys Sea correlate well with the reported humid and arid phases, respectively in the Qaidam and Xining basins, thus demonstrating the role of the proto-Paratethys Sea as an important moisture source for the Asian interior and its regression as a contributor to Asian aridification. We lastly study the mechanics, relative contribution and preservation efficiency of ancient epicontinental seas as carbon sinks with new and existing data, using organic rich (sapropel) deposits dated to the PETM from the extensive epicontinental proto-Paratethys and West Siberian seas. We estimate ca. 1390±230 Gt organic C burial, a substantial amount compared to previously estimated global total excess organic C burial (ca. 1700-2900 Gt) is focused in the proto-Paratethys and West Siberian seas alone. We also speculate that enhanced organic carbon burial later over much of the proto-Paratethys (and later Paratethys) basin (during the deposition of the Kuma Formation and Maikop series, repectively) may have majorly contributed to drawdown of atmospheric carbon dioxide before and during the EOT cooling and glaciation of Antarctica. For past periods with smaller epicontinental seas, the effectiveness of this negative carbon cycle feedback was arguably diminished, and the same likely applies to the present-day.}, language = {en} } @phdthesis{LauerDuenkelberg2023, author = {Lauer-D{\"u}nkelberg, Gregor}, title = {Extensional deformation and landscape evolution of the Central Andean Plateau}, doi = {10.25932/publishup-61759}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-617593}, school = {Universit{\"a}t Potsdam}, pages = {xviii, 195}, year = {2023}, abstract = {Mountain ranges can fundamentally influence the physical and and chemical processes that shape Earths' surface. With elevations of up to several kilometers they create climatic enclaves by interacting with atmospheric circulation and hydrologic systems, thus leading to a specific distribution of flora and fauna. As a result, the interiors of many Cenozoic mountain ranges are characterized by an arid climate, internally drained and sediment-filled basins, as well as unique ecosystems that are isolated from the adjacent humid, low-elevation regions along their flanks and forelands. These high-altitude interiors of orogens are often characterized by low relief and coalesced sedimentary basins, commonly referred to as plateaus, tectono-geomorphic entities that result from the complex interactions between mantle-driven geological and tectonic conditions and superposed atmospheric and hydrological processes. The efficiency of these processes and the fate of orogenic plateaus is therefore closely tied to the balance of constructive and destructive processes - tectonic uplift and erosion, respectively. In numerous geological studies it has been shown that mountain ranges are delicate systems that can be obliterated by an imbalance of these underlying forces. As such, Cenozoic mountain ranges might not persist on long geological timescales and will be destroyed by erosion or tectonic collapse. Advancing headward erosion of river systems that drain the flanks of the orogen may ultimately sever the internal drainage conditions and the maintenance of storage of sediments within the plateau, leading to destruction of plateau morphology and connectivity with the foreland. Orogenic collapse may be associated with the changeover from a compressional stress field with regional shortening and topographic growth, to a tensional stress field with regional extensional deformation and ensuing incision of the plateau. While the latter case is well-expressed by active extensional faults in the interior parts of the Tibetan Plateau and the Himalaya, for example, the former has been attributed to have breached the internally drained areas of the high-elevation sectors of the Iranian Plateau. In the case of the Andes of South America and their internally drained Altiplano-Puna Plateau, signs of both processes have been previously described. However, in the orogenic collapse scenario the nature of the extensional structures had been primarily investigated in the northern and southern terminations of the plateau; in some cases, the extensional faults were even regarded to be inactive. After a shallow earthquake in 2020 within the Eastern Cordillera of Argentina that was associated with extensional deformation, the state of active deformation and the character of the stress field in the central parts of the plateau received renewed interest to explain a series of extensional structures in the northernmost sectors of the plateau in north-western Argentina. This study addresses (1) the issue of tectonic orogenic collapse of the Andes and the destruction of plateau morphology by studying the fill and erosion history of the central eastern Andean Plateau using sedimentological and geochronological data and (2) the kinematics, timing and magnitude of extensional structures that form well-expressed fault scarps in sediments of the regional San Juan del Oro surface, which is an integral part of the Andean Plateau and adjacent morphotectonic provinces to the east. Importantly, sediment properties and depositional ages document that the San Juan del Oro Surface was not part of the internally-drained Andean Plateau, but rather associated with a foreland-directed drainage system, which was modified by the Andean orogeny and that became successively incorporated into the orogen by the eastward-migration of the Andean deformation front during late Miocene - Pliocene time. Structural and geomorphic observations within the plateau indicate that extensional processes must have been repeatedly active between the late Miocene and Holocene supporting the notion of plateau-wide extensional processes, potentially associated with Mw ~ 7 earthquakes. The close relationship between extensional joints and fault orientations underscores that 3 was oriented horizontally in NW-SE direction and 1 was vertical. This unambiguously documents that the observed deformation is related to gravitational forces that drive the orogenic collapse of the plateau. Applied geochronological analyses suggest that normal faulting in the northern Puna was active at about 3 Ma, based on paired cosmogenic nuclide dating of sediment fill units. Possibly due to regional normal faulting the drainage system within the plateau was modified, promoting fluvial incision.}, language = {en} } @misc{KroegerRoussanovaSchmucketal.2013, author = {Kr{\"o}ger, Bj{\"o}rn and Roussanova, Elena and Schmuck, Thomas and Schn{\"o}pf, Markus and Schwarz, Ingo and Thiemer-Sachse, Ursula}, title = {HiN : Alexander von Humboldt im Netz}, series = {HIN : Alexander von Humboldt im Netz ; international review for Humboldtian studies}, volume = {XIV}, journal = {HIN : Alexander von Humboldt im Netz ; international review for Humboldtian studies}, number = {27}, editor = {Ette, Ottmar and Knobloch, Eberhard}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1617-5239}, doi = {10.18443/hinvol14iss272013}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-70191}, pages = {97}, year = {2013}, abstract = {Inhalt: Kr{\"o}ger, Bj{\"o}rn: Remarks on a scene, depicting the primeval world. A talk given by Leopold von Buch in 1831, popularizing the Duria antiquior Roussanova, Elena: Hermann Trautschold und die Ehrung Alexander von Humboldts in Russland Schmuck, Thomas: Tod in den Anden. Ein Brief Francis Halls an Humboldt 1831 und seine historischen und politischen Hintergr{\"u}nde Schnoepf, Markus: Evaluationskriterien f{\"u}r digitale Editionen und die reale Welt Thiemer-Sachse, Ursula: „Wir verbrachten mehr als 24 Stunden, ohne etwas anderes als Schokolade und Limonade zu uns zu nehmen". Hinweise in Alexander von Humboldts Tagebuchaufzeichnungen zu Fragen der Verpflegung auf der Forschungsreise durch Spanisch-Amerika Schwarz, Ingo: Hanno Beck zum 90. Geburtstag Beck, Hanno: Das literarische Testament Alexander von Humboldts 1799}, language = {de} } @misc{KoechyKortumLeitneretal.2002, author = {K{\"o}chy, Kristian and Kortum, Gerhard and Leitner, Ulrike and Lubrich, Oliver and Navas Sierra, Jose Alberto and Puig-Samper, Miguel {\´A}ngel and Rebok, Sandra and Schwarz, Ingo}, title = {HiN : Alexander von Humboldt im Netz}, volume = {III}, number = {5}, editor = {Ette, Ottmar and Knobloch, Eberhard}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {2568-3543}, doi = {10.18443/hinvol3iss052002}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-424305}, pages = {133}, year = {2002}, abstract = {Inhalt: - Kristian K{\"o}chy: Das Ganze der Natur - Alexander von Humboldt und das romantische Forschungsprogramm - Gerhard Kortum: „Alexander von Humboldt" als Name f{\"u}r Forschungsschiffe vor dem Hintergrund seiner meereskundlichen Arbeiten - Ulrike Leitner: „Anciennes folies neptuniennes!" {\"U}ber das wiedergefundene „Journal du Mexique {\`a} Veracruz" aus den mexikanischen Reisetageb{\"u}chern A. v. Humboldts - Oliver Lubrich: „Egipcios por doquier". Alejandro de Humboldt y su visi{\´o}n 'orientalista' de Am{\´e}rica - Jose Alberto Navas Sierra: Humboldt y el '{\´A}rea de Libre Comercio de las Am{\´e}ricas (ALCA)' - Un ejercicio de 'ciencia humboldtiana - Miguel {\´A}ngel Puig-Samper und Sandra Rebok: Un sabio en la meseta. El viaje de Alejandro de Humboldt a Espa{\~n}a en 1799 - Ingo Schwarz: Nachruf - Zur Erinnerung an Kurt-R. Biermann}, language = {de} } @misc{KnoblochCheirifWoloskyEstevamOFernandesetal.2014, author = {Knobloch, Eberhard and Cheirif Wolosky, Alejandro and Estevam O. Fernandes, Luiz and Erdmann, Dominik and Honigmann, Peter and Thomas, Christian and Treuber, Konstantin and Werner, Anja}, title = {HiN : Alexander von Humboldt im Netz}, series = {HIN : Alexander von Humboldt im Netz ; international review for Humboldtian studies}, volume = {XV}, journal = {HIN : Alexander von Humboldt im Netz ; international review for Humboldtian studies}, number = {28}, editor = {Ette, Ottmar and Knobloch, Eberhard}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1617-5239}, doi = {10.18443/hinvol15iss282014}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-84097}, pages = {79}, year = {2014}, abstract = {Inhalt: Eberhard Knobloch: Der Briefwechsel zwischen Alexander von Humboldt und Charles Lyell: Ein {\"U}berblick Alejandro Cheirif Wolosky: La recepci{\´o}n humboldtiana de Crist{\´o}bal Col{\´o}n Luiz Estevam O. Fernandes: Political Essay on the Kingdom of New Spain: Humboldt and the history of Mexico Dominik Erdmann/Christian Thomas: „… zu den wunderlichsten Schlangen der Gelehrsasmkeit zusammengegliedert". Neue Materialien zu den ‚Kosmos-Vortr{\"a}gen' Alexander von Humboldts, nebst Vor{\"u}berlegungen zu deren digitaler Edition Konstantin Treuber „Warum ich nicht Diorit-Trachyt sagen soll." - Ein geologischer Brief Gustav Roses an Alexander von Humboldt Anja Werner: Alexander von Humboldt's Footnotes: "Networks of Knowledge" in the Sources of the 1826 Essai politique sur l'{\^i}le de Cuba Peter Honigmann: Alexander von Humboldts Journale seiner russisch-sibirischen Reise 1829 [mit einer Einf{\"u}hrung von Eberhard Knobloch]}, language = {mul} } @misc{PaesslerAndressDuranCasasetal.2018, author = {P{\"a}ßler, Ulrich and Andress, Reinhard and Dur{\´a}n Casas, Vicente and Ette, Ottmar and H{\"u}lsenberg, Dagmar and Schmuck, Thomas and Sundermann, Werner}, title = {HiN : Alexander von Humboldt im Netz}, series = {HIN : Alexander von Humboldt im Netz ; international review for Humboldtian studies}, volume = {XIX}, journal = {HIN : Alexander von Humboldt im Netz ; international review for Humboldtian studies}, number = {36}, editor = {Ette, Ottmar and Knobloch, Eberhard}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {2568-3543}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-410919}, pages = {109}, year = {2018}, abstract = {Inhalt: -Ulrich P{\"a}ßler: Die edition humboldt digital. Dokumente zur Neuausgabe der Ideen zu einer Geographie der Pflanzen (1825-1826) -Reinhard Andress: Eduard Dorsch and his unpublished poem on the occasion of Humboldt's 100th birthday -Vicente Dur{\´a}n Casas: Immanuel Kant, Alexander von Humboldt and the Tequendama Fall. Two Prussians linked by Geography -Ottmar Ette: Languages about Languages: Two Brothers and one Humboldtian Science -Dagmar H{\"u}lsenberg: Alexander von Humboldts Erl{\"a}uterungen zu {\"O}fen f{\"u}r die Herstellung von Keramik- und Glaserzeugnissen -Thomas Schmuck: Missgl{\"u}ckte Begegnung. Der kurze Briefwechsel zwischen Leopold von Buch und Goethe -Werner Sundermann: Alexander von Humboldt und das Persische}, language = {de} } @misc{KnoblochKoelbelSauerweinetal.2008, author = {Knobloch, Eberhard and K{\"o}lbel, Bernd and Sauerwein, Martin and Sauerwein, Katrin and K{\"o}lbel, Steffen and Buckow, Cathleen and Leitner, Ulrike and Schwarz, Ingo and Suckow, Christian and Werner, Petra and Pieper, Herbert}, title = {HiN : Alexander von Humboldt im Netz = Herbert Pieper zum 65. Geburtstag}, volume = {IX}, number = {16}, editor = {Ette, Ottmar and Knobloch, Eberhard}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1617-5239}, doi = {10.18443/hinvol9iss162008}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-42246}, pages = {65}, year = {2008}, abstract = {Herbert Pieper zum 65. Geburtstag Inhalt: - Eberhard Knobloch: Herbert Pieper zum 65. Geburtstag. Ein R{\"u}ckblick - Bernd K{\"o}lbel, Martin Sauerwein, Katrin Sauerwein, Steffen K{\"o}lbel, Cathleen Buckow: Das Fragment des englischen Tagebuches von Alexander von Humboldt - Ulrike Leitner: Humboldt, Cotta, Ritter. Eine Miszelle {\"u}ber die Arbeit an einer Edition - Ingo Schwarz: "da ich mich lebhaft f{\"u}r sein Schiksal im Neuen Continent interessire". A. v. Humboldt als F{\"o}rderer Oscar M. Liebers - Christian Suckow: Humboldts spanische Option 1830. Eine Nachlese - Petra Werner: Bemerkungen zu Alexander von Humboldts Russland-Tagebuch - Herbert Pieper Alexander von Humboldts Wahl in die Akademie der Wissenschaften zu Berlin - Publikationen von Herbert Pieper [Bibliographie]}, language = {de} } @phdthesis{Bergner2003, author = {Bergner, Andreas G. N.}, title = {Lake-level fluctuations and Late Quaternary climate change in the Central Kenya Rift}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-0001428}, school = {Universit{\"a}t Potsdam}, year = {2003}, abstract = {Diese Arbeit besch{\"a}ftigt sich mit der Rekonstruktion von Klima in historischen Zeiten im tropischen Ostafrika. Nach einer {\"U}bersicht {\"u}ber die heutigen klimatischen Bedingungen der Tropen und den Besonderheiten des ostafrikanischen Klimas, werden die M{\"o}glichkeiten der Klimarekonstruktion anhand von Seesedimenten diskutiert. Es zeigt sich, dass die hoch gelegenen Seen des Zentralen Keniarifts, als Teil des Ostafrikanischen Grabensystems, besonders geeignete Klimaarchive darstellen, da sie sensibel auf klimatische Ver{\"a}nderungen reagieren. Ver{\"a}nderungen der Seechemie, wie sie in den Sedimenten aufgezeichnet werden, eignen sich um die nat{\"u}rlichen Schwankungen in der Quart{\"a}ren Klimageschichte Ostafrikas nachzuzeichnen. Basierend auf der guten 40Ar/39Ar- und 14C-Datierbarkeit der Seesedimente wird eine Chronologie der pal{\"a}o{\"o}kologischen Bedingungen anhand von Diatomeenvergesellschaftungen restauriert. Dabei zeigen sich f{\"u}r die Seen Nakuru, Elmenteita und Naivasha kurzfristige Transgression/ Regressions-Zyklen im Intervall von ca. 11.000 Jahren w{\"a}hrend des letzten (ca. 12.000 bis 6.000 J.v.H.) und vorletzten Interglazials (ca. 140.000 bis 60.000 J.v.H.). Zus{\"a}tzlich kann ein allgemeiner, langfristiger Trend der Seeentwicklung von großen Frischwasserseen hin zu st{\"a}rker salinen Gew{\"a}ssern innerhalb der letzen 1 Mio. Jahre festgestellt werden. Mittels Transferfunktionen und einem hydro-klimatischen Modellansatz k{\"o}nnen die restaurierten limnologischen Bedingungen als klimatische Schwankungen des Einzugsgebietes interpretiert werden. Wenngleich auch der zus{\"a}tzliche Einfluss von tektonischen Ver{\"a}nderungen auf das Seeeinzugsgebiet und das Gewicht ver{\"a}nderter Grundwasserstr{\"o}me abgewogen werden, zeigt sich, dass allein geringf{\"u}gig erh{\"o}hte Niederschlagswerte von ca. 30±10 \% zu dramatischen Seespiegelanstiegen im Zentralen Keniarift f{\"u}hren. Aufgrund der etablierten hydrrologisch-klimatischen Wechselwirkungen werden R{\"u}ckschl{\"u}sse auf die nat{\"u}rliche Variabilit{\"a}t des ostafrikanischen Klimas gezogen. Zudem wird die Sensitivit{\"a}t der Keniarift-Seen in Bezug auf die St{\"a}rke der {\"a}quatorialen Insolation und hinsichtilch variabler Oberfl{\"a}chenwassertemperaturen des Indischen Ozeans bewertet.}, language = {en} }