نتایج جستجو برای: upper holocene warm period

تعداد نتایج: 713284  

2008
Tim Denham Simon Haberle

A practice-based method is advanced to understand the emergence and transformation of agricultural practices in the Upper Wahgi valley during the Holocene. Conceptually, practices represent the nexus of human–environment interactions, as well as of structure–agency relationships, while methodologically, they are the visible remains – whether encountered directly through archaeology, or inferred...

Journal: :Scientific reports 2016
Andrew C Smith Peter M Wynn Philip A Barker Melanie J Leng Stephen R Noble Wlodek Tych

Century-to-millennial scale fluctuations in precipitation and temperature are an established feature of European Holocene climates. Changes in moisture delivery are driven by complex interactions between ocean moisture sources and atmospheric circulation modes, making it difficult to resolve the drivers behind millennial scale variability in European precipitation. Here, we present two overlapp...

Journal: : 2023

The present paper is a preliminary attempt to develop protocol for analyzing Late Pleistocene and Holocene paleocommunities of soricids using modern approaches the morphological data analysis. First, we assessed abilities fossil soricid collections from Ural Far East localities provide complex interregional analysis phenotype variation. Accordingly, first time in general context, study provides...

Journal: :iranian journal of earth science 0
fatemeh hadavi professor, department of geology, ferdowsi university of mashhad, mashhad, iran marziyeh notghi moghaddam assistant professor, department of geology, payame noor university, tehran, iran lida khodadadi department of geology, payame noor university, tehran, iran

calcareous nannofossil assemblages recovered from a long, continuous section have been described from the sarayan region in lut block in east iran. the marine upper cretaceous sediments of this section yield medium diverse and well-preserved calcareous nannofossil assemblages. a structural analysis of upper cretaceous calcareous nannofloras has revealed 30 nannofossil species. a revised zonatio...

2008
Luo Wang Houyuan Lu Jiaqi Liu Zhaoyan Gu Jens Mingram Guoqiang Chu Jingjing Li Patrick Rioual Jörg F. W. Negendank Jingtai Han Tungsheng Liu

[1] We present a continuous record of fossil diatoms from Huguang Maar Lake (HML) in southeastern China, spanning the time interval 17,500 to 6000 calendar years (cal years) B.P. The seasonal change in relative abundance of the dominant diatom taxa, Aulacoseira and Cyclotella species, can be used as a proxy of the strength of winter monsoon winds (WMW), which is supported by the results of a se...

1999
Jerry A. Mohr Cathy Whitlock Carl N. Skinner

Pollen and high-resolution charcoal data from Bluff Lake and Crater Lake, California, indicate similar changes in climate, vegetation and fire history during the last 15 500 years. Pollen data at Bluff Lake suggest that the vegetation between c. 15 500 and 13 100 cal. BP consisted of subalpine parkland with scattered Pinus and Abies. After 13 100 cal. BP a relatively closed forest of P. montico...

Journal: :Frontiers in Earth Science 2021

The summer climate of northern Japan since the last glacial period has likely been determined by atmospheric and oceanic dynamics, such as changes in North Pacific High, position westerlies, Kuroshio Current, Tsushima Warm Current (TWC), East Asian monsoon. However, it is unclear which factor most important. In this study, we analyzed leaf wax δ 13 C δD glycerol dialkyl tetraethers (GDGTs) sedi...

Fatemeh Hadavi Lida Khodadadi Marziyeh Notghi Moghaddam,

Calcareous nannofossil assemblages recovered from a long, continuous section have been described from the Sarayan region in Lut Block in east Iran. The marine Upper Cretaceous sediments of this section yield medium diverse and well-preserved calcareous nannofossil assemblages. A structural analysis of Upper Cretaceous calcareous nannofloras has revealed 30 nannofossil species. A revised zonatio...

2005
E. Christa Farmer Peter B. deMenocal Thomas M. Marchitto

[1] Mg/Ca analyses of G. bulloides and abundances of N. pachyderma (left coiling) from Ocean Drilling Program (ODP) Leg 175 Hole 1084B in the Benguela coastal upwelling system document lower sea surface temperatures during the Last Glacial Maximum (LGM), Younger Dryas, mid-Holocene, and Little Ice Age in the southeastern Atlantic. Taking into consideration the possible effects of differential c...

2012
A. Muñoz J. Cristobo P. Rios M. Druet V. Polonio E. Uchupi J. Acosta

The north flowing Falkland / Malvinas Current has generated sediment drifts at a depth of 1200-1600 m in the Patagonian middle continental slope out of early Holocene hemipelagics, late Pleistocene ice rafted clastics, and Neogene fluvial sediments. Possibly there may be two generations of drifts, Pleistocene on the outer middle slope and Holocene on the inner shelf. The ice rafted debris origi...

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