نتایج جستجو برای: four periods including present warm period
تعداد نتایج: 3087212 فیلتر نتایج به سال:
Winter CO(2) gas exchange of the last three flushes of cembran pine (Pinus cembra L.) was studied under ambient conditions at the alpine timberline, an ecotone with strong seasonal changes in climate. During the coldest months of the year, December to March, gas exchange was almost completely suppressed and even the highest irradiances and temperatures did not cause a significant increase in ne...
Understanding how the Viking societies were impacted by past climate variability and they adapted to it has hardly been investigated. Here, we have carried out a new multi-proxy investigation of lake sediments, including geochemical palynological analyses, reconstruct changes in temperature agricultural practices pre-Viking Southeastern Norway during period between 200 1300 CE. The periods 200–...
Abstract. The total ozone data over Europe are available for only few ground-based stations in the pre-satellite era disallowing examination of the spatial trend variability over the whole continent. A need of having gridded ozone data for a trend analysis and input to radiative transfer models stimulated a reconstruction of the daily ozone values since January 1950. Description of the reconstr...
The number of large slope failures in some high-mountain regions such as the European Alps has increased during the past two to three decades. There is concern that recent climate change is driving this increase in slope failures, thus possibly further exacerbating the hazard in the future. Although the effects of a gradual temperature rise on glaciers and permafrost have been extensively studi...
The purpose of this study is predicting climate changes and investigating the effect of probable climate change on the growing degree-days in the northwest of Iran. For this purpose the climatic data of seven synoptic stations during a 25 years period (1985-2009) was collected including Oroomieh, Tabriz, Zanjan, Sanandaj, Ghazvin, Kermanshah, and Hamedan were used as the base period and thus te...
Abstract Coastal zones are ecosystems of high economic value but exposed to numerous disturbances, while they represent nurseries for many fish species, raising the issue preservation their functions and services. In this context, juvenile assemblages all types habitats present in shallow coastal were studied on south-east coast France using underwater visual censuses warm (June–July 2014) cold...
Multi-proxy high-resolution records relating to climate and dominant vegetation cover have been obtained from a peat deposit retrieved the Kapsabet swamp in western Kenya. The 4-m long sequence provided continuous sedimentation record spanning ca. 3023 cal yr BP present is representative of late Holocene changes relatively high-altitude part Lake Victoria catchment. Paleoenvironmental factors i...
abstract this study aimed at investigating the possible relationship between self-assessment in writing and self-regulation of iranian efl learners. the main purpose of the study was not only to report and inform about this relationship, but also to investigate and find practical outcomes of the incorporation of self-assessment in writing, such as improving writing skill. the research was carr...
Abstract We measured stable isotopes (δ 18 O and δ 13 C) in Sphagnum cellulose that was extracted from a long peat core drilled the ombrotrophic Mohos bog, Ciomadul Mountain, Romania. The 10-m-long profile spans period 11,800 cal yr BP to present. C data indicate there were several cooling events warm periods area of bog during Holocene. 8.2-ka cold event, however, not detected using values. Re...
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