Martin Kehl

Dr. Martin Kehl


Research Focus & Metrics

Academic Career Length

22Years (2005-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 January 2009 in Erdkunde
Verified
Journal Article
Closed access
MKMartin Kehl
Martin Kehl
Summary: The mostly Mediterranean climate of Iran is governed by the pressure systems of the Siberian High, the West- erly depressions and the SW Monsoon. In the past, the locations and intensities of these systems changed probably causing climate change and affecting landscape evolution in this ecologically diverse country. Recently, new evidence for Quaternary climate change in Iran has been presented. This paper briefly reviews the present state of knowledge and identifies future perspectives of paleoclimatic research in Iran. Paleoclimatic deductions have mainly been based on geomorphic evidence and, more recently, also on stratigraphical investigations including the physical dating of sediments. In northern and western Iran climate changed between dry and cold climatic conditions during the stadials and moist and warm conditions during the interglacials. Lake sediments and loess deposits also suggest moisture increases during interstadials of the Last and Pe- nultimate Glacials. In western Iran, the Younger Dryas and the Lower Holocene were most probably characterized by dry climatic conditions. Overall, the climatic cycles and events known from other parts of the globe are rarely documented in Iran and our picture of past climate change there is patchy and incomplete. More proxy-information and geochronological data are needed, in particular for central and southern Iran. The sedimentary records of lakes and playas as well as loess deposits hold a strong potential to identify climate signals and the paleoclimate information of speleothems or tree-rings has not yet been challenged. Zusammenfassung: Das im Wesentlichen mediterrane Klima des Iran wird durch die Drucksysteme des Sibirischen Hochs, der zyklonalen Depressionen und des SW Monsuns bestimmt. Die Intensitäten und Positionen dieser Drucksysteme variier- ten in der geologischen Vergangenheit, was zu Klimawechseln und Folgen für die Landschaftsgenese in diesem naturräumlich vielseitigem Land geführt haben wird. Unlängst wurden neue Belege für quartäre Klimawechsel in Iran präsentiert. Dieser Beitrag stellt den aktuellen Kenntnisstand zusammen und zeigt Perspektiven für künftige paläoklimatische Forschungen auf. Schlussfolgerungen über das Paläoklima Irans wurden bisher im Wesentlichen aus geomorphologischen Hinweisen gewon- nen und in jüngerer Zeit auch aus stratigraphischen Untersuchungen und physikalischen Altersdatierungen von Sedimenten. Demnach wechselte das Klima in Nord- und Westiran von trocken-kalten Bedingungen während der Stadiale zu feucht- warmen Verhältnissen während der Interglaziale. Seesedimente und Lössablagerungen deuten auch Phasen vergleichsweise feuchterer Bedingungen während des letzten und vorletzten Glazials an, die wahrscheinlich mit Interstadialen zu korrelieren sind. In Westiran waren die Jüngere Dryas und das untere Holozän sehr wahrscheinlich durch trockene Klimaverhältnisse gekennzeichnet. Insgesamt sind die aus anderen Regionen bekannten Klimazyklen und -ereignisse noch wenig dokumen- tiert und unser Bild des Klimawandels in der Region ist daher sehr lückenhaft und unvollständig. Vor diesem Hintergrund werden mehr Proxy-Informationen und geochronologische Daten benötigt, insbesondere über Zentral- und Südiran. Die Sedimentarchive der iranischen Seen und Playas sowie Lössablagerungen bieten ein großes Potential, weitere Klimasignale zu identifizieren. Dies gilt auch für die noch kaum untersuchten Klimaarchive von Speleothemen und Baumringen.

1 October 2012 in Quaternary International
Verified
Journal Article
Closed access
ISIsabell Schmidt
Isabell Schmidt
MBMarcel Bradtmöller
Marcel Bradtmöller
MKMartin Kehl
Martin Kehl
APAndreas Pastoors
Andreas Pastoors
YTYvonne Tafelmaier
Yvonne Tafelmaier
GWGerd-Christian Weniger
Gerd-Christian Weniger

1 April 2009 in Quaternary International
Verified
Journal Article
Closed access
MFManfred Frechen
Manfred Frechen
MKMartin Kehl
Martin Kehl
CRChristian Rolf
Christian Rolf
RSReza Sarvati
Reza Sarvati
ASArmin Skowronek
Armin Skowronek

31 May 2013 in The Holocene
Verified
Journal Article
Closed access
PDF file
LZLydia Zapata
Lydia Zapata
JLJosé Antonio López-Sáez
José Antonio López-Sáez
MRMónica Ruiz-Alonso
Mónica Ruiz-Alonso
JLJörg Linstädter
Jörg Linstädter
Guillem Pérez-JordàGuillem Pérez-Jordà
Guillem Pérez-Jordà
LPLeonor Peña-Chocarro
Leonor Peña-Chocarro
The littoral site of Ifri Oudadane is one of the most important recently excavated sites in the Mediterranean Maghreb. The shelter presents Epipalaeolithic and Neolithic layers and therefore offers the possibility to investigate the Neolithic transition in the region. Besides introducing the archaeological context, this paper focuses on palaeobotanical data in order to reconstruct Holocene environmental change and human use of plant resources for the period c. 11 to 5.7 ka cal. BP. Results show intense landscape transformations resulting from anthropic and climatic factors. First human occupations start at the beginning of the Holocene with favourable conditions in this otherwise harsh semi-arid stretch of land. A wooded environment with evergreen sclerophyllous oaks and riparian forests is documented and exploited by hunter-gatherers. From c. 7.6 ka cal. BP farming activities are well attested together with significant human impact, herding pressure and a progressive decline of arboreal components. After 6.6 ka cal. BP conditions become less favourable and markers for aridity increase. Riparian taxa disappear (Alnus) or decrease (Fraxinus, Populus, Salix); shrubs (Tamarix) and grasses (Artemisia) increase with a degradation of forest into shrubland (macchia). During 6.6 and 6.0 ka cal. BP there is a general occupation gap in arid and semi-arid Morocco and evidence for that change is also found in the alluvial deposits of the Moulouya, NE Morocco. Indicators for food production decrease at the same time and the site is abandoned during the first half of the 6th millennium cal. BP.


24 May 2013 in Geology
Verified
Journal Article
Closed access
BBB. Buggle
B. Buggle
UHU. Hambach
U. Hambach
MKMartin Kehl
Martin Kehl
SMS. B. Markovic
S. B. Markovic
LZL. Zoller
L. Zoller
BGB. Glaser
B. Glaser