Middle Miocene climate of southwestern Anatolia from multiple botanical proxies

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Middle Miocene climate of southwestern Anatolia from multiple botanical proxies

Bouchal, Johannes M., 1979- (author): Naturhistoriska riksmuseet,Enheten för paleobiologi,Paleobiologi

Güner, Tuncay H. (author): Naturhistoriska riksmuseet,Enheten för paleobiologi,Faculty of Forestry, Department of Forest Botany, Istanbul University Cerrahpa¸sa, 34473 Bahçeköy, Istanbul, Turkey

Denk, Thomas (author): Naturhistoriska riksmuseet,Enheten för paleobiologi

(creator_code:org_t)

2018-10-17
2018
English.
In: Climate of the Past Discussions. - Vienna : European Geosciences Union (EGU). - 1814-9340 .- 1814-9359 .- 1814-9332. ; 14, s. 1427-1440

Related links:: https://doi.org/10.5...; show more...; https://nrm.diva-por... (primary) (Raw object); https://cp.copernicu...; https://urn.kb.se/re...; https://doi.org/10.5...; show less...

Journal article (other academic/artistic)

Abstract Subject headings

The middle Miocene climate transition (MMCT) was a phase of global cooling possibly linked to decreasing levels of atmospheric CO2. The MMCT coincided with the European Mammal Faunal Zone MN6. From this time, important biogeographic links between Anatolia and eastern Africa include the hominid Kenyapithecus. Vertebrate fossils suggested mixed open and forested landscapes under (sub)tropical seasonal climates for Anatolia. Here, we infer the palaeoclimate during the MMCT and the succeeding cooling phase for a middle Miocene (14.8–13.2 Ma) of an intramontane basin in southwestern Anatolia using three2palaeobotanical proxies: (i) Köppen signatures based on the nearest-living-relative principle. (ii) Leaf physiognomy analysed with the Climate Leaf Analysis Multivariate Program (CLAMP). (iii) Genus-level biogeographic affinities of fossil floras with modern regions. The three proxies reject tropical climates for the MMCT of southwestern Anatolia and instead infer warm temperate C climates. Köppen signatures reject summer-dry Cs climates but cannot discriminate between fully humid Cf and winter-dry Cw; CLAMP reconstructs Cf climate based on the low X3.wet/X3.dry ratio. Additionally, we assess whether the palaeobotanical record does resolve transitions from the warm Miocene Climatic Optimum (MCO, 16.8–14.7 Ma) into the MMCT (14.7–13.9 Ma), and a more pronounced cooling at 13.9–13.8 Ma, as reconstructed from benthic stable isotope data. For southwestern Anatolia, we find that arboreal taxa predominate in MCO floras (MN5), whereas in MMCT floras (MN6) abundances of arboreal and non-arboreal elements strongly fluctuate indicating higher structural complexity of the vegetation. Our data show a distinct pollen zone between MN6 and MN7+8 dominated by herbaceous taxa. The boundary MN6 and MN7+8, roughly corresponding to a first abrupt cooling at 13.9–13.8 Ma, possibly might be associated with this herb-rich pollen zone.

Subject headings

NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)
NATURVETENSKAP -- Biologi -- Botanik (hsv//swe)
NATURAL SCIENCES -- Biological Sciences -- Botany (hsv//eng)
NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)

Keyword

Miocene
Climate proxies
The changing Earth
Den föränderliga jorden

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vet (subject category)
art (subject category)

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By the author/editor: Bouchal, Johanne ...; Güner, Tuncay H.; Denk, Thomas

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Climate Research

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Botany

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Geology

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Physical Geograp ...

Articles in the publication: Climate of the P ...

By the university: Swedish Museum of Natural History

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