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• W82989367 abstract "Since modern Arctic regions are characterized by an icehouse climate no modern vegetation type exists that is comparable to the early Cainozoic vegetation of high latitudes. In addition, many of the plant taxa reported from the early Cainozoic of Arctic areas cannot currently be placed within extant taxa below the rank of families. This makes it diffi cult to estimate various aspects of palaeoclimate using quantitative approaches. In the present paper four different quantitative palaeobotanical methods are used to estimate palaeoclimate parameters for three fl oras from the early Palaeocene and the middle Eocene-early Oligocene of Spitsbergen. The methods used are: 1) the Coexistence Approach based on the nearest living relative (NLR) method, 2) leaf margin analysis, 3) the multivariate Climate-Leaf Analysis Multivariate Program (CLAMP) based on leaf physi- ognomy of modern vegetation mainly from North America and East Asia, and, 4) a recently developed mulitvari- ate leaf-physiognomical approach based on modern European vegetation. Because most NLRs could only be determined with a low taxonomic resolution the Coexistence Approach estimated rather wide ranges for temperature and precipitation for most of the fl oras investigated. Leaf margin analysis for the Lower Paleocene Firkanten Formation produced an estimate for mean annual temperature (MAT), which is in agreement with other proxies and previous interpretations, but estimates for both Eocene formations appear to be too low. CLAMP produced temperature estimates that are in fairly good agreement with previous palaeoclimatic interpretations for the Palaeogene of the Arctic, as well as most CA estimates. Although estimates for the length of the growing season (GSL) are more or less in accordance with what can be expected for polar regions, estimates for growing season precipitation (GSP) may be slightly too low, especially for the Eocene - Oligocene fl oras. The European leaf physiognomic approach (ELPA) produced temperature estimates that are consistently lower than all other methods, as well as independent proxies. Accordingly, GSL estimates are rather low and GSP estimates are even lower than those obtained with CLAMP. All methods point to a cooling trend from the Paleocene to the middle/late Eocene - early Oligocene. Such a cooling trend is in agreement with independent data on global and regional climate development during the Palaeogene. In gen- eral, leaf physiognomic methods may be taphonomically biased towards specifi c leaf types and several authors have argued against the use of leaf physiognomic methods calibrated with data from modern vegetation, which cannot be considered a potential analogue for polar forests from the Palaeogene of the Arctic. Nevertheless, our results indicate that only CLAMP, and with some restrictions also CA, seem to be able to produce quantitative estimates for selected palaeoclimate parameters for the Palaeogene of Spitsbergen." @default.
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• W82989367 date "2007-01-01" @default.
• W82989367 modified "2023-09-27" @default.
• W82989367 title "Fossil leaves as palaeoclimate proxies in the Palaeogene of Spitsbergen (Svalbard)" @default.
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