HIGH RESOLUTION CHRONOLOGY USING ROCK MAGNETIC CYCLOSTRATIGRAPHY IN THE BAZA BASIN, SOUTHERN SPAIN

2020 ◽  
Author(s):  
Monica C. Powers ◽  
◽  
David Anastasio ◽  
Josep M. Pares ◽  
M. Duval ◽  
...  
Keyword(s):  
High Resolution ◽  
Southern Spain

scholarly journals CARMENES – M Dwarfs and their Planets: First Results

2016 ◽  
Vol 12 (S328) ◽  
pp. 46-53 ◽  
Author(s):  
A. Quirrenbach ◽  
P.J. Amado ◽  
I. Ribas ◽  
A. Reiners ◽  
J.A. Caballero ◽  
...  
Keyword(s):  
High Resolution ◽  
Radial Velocity ◽  
Wavelength Range ◽  
Southern Spain ◽  
Science Program ◽  
Velocity Measurements ◽  
M Dwarfs ◽  
First Results ◽  
Calar Alto

AbstractCARMENES is a pair of high-resolution (R ≳ 80, 000) spectrographs covering the wavelength range from 0.52 to 1.71 μm with only small gaps. The instrument has been optimized for precise radial velocity measurements. It was installed and commissioned at the 3.5 m telescope of the Calar Alto observatory in Southern Spain in 2015. The first large science program of CARMENES is a survey of ~300 M dwarfs, which started on Jan 1, 2016. We present an overview of the instrument, and provide a few examples of early science results.

scholarly journals High-Resolution Temperature Variability Reconstructed from Black Pine Tree Ring Densities in Southern Spain

Atmosphere ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 748
Author(s):  
Jan Esper ◽  
Claudia Hartl ◽  
Ernesto Tejedor ◽  
Martin de Luis ◽  
Björn Günther ◽  
...  
Keyword(s):  
High Resolution ◽  
Tree Ring ◽  
Volcanic Eruptions ◽  
Temperature Variability ◽  
Southern Spain ◽  
Black Pine ◽  
Early 19Th Century ◽  
Pine Tree ◽  
Natural Park ◽  
Reconstructed Temperature

The presence of an ancient, high-elevation pine forest in the Natural Park of Sierras de Cazorla in southern Spain, including some trees reaching >700 years, stimulated efforts to develop high-resolution temperature reconstructions in an otherwise drought-dominated region. Here, we present a reconstruction of spring and fall temperature variability derived from black pine tree ring maximum densities reaching back to 1350 Coefficient of Efficiency (CE). The reconstruction is accompanied by large uncertainties resulting from low interseries correlations among the single trees and a limited number of reliable instrumental stations in the study region. The reconstructed temperature history reveals warm conditions during the early 16th and 19th centuries that were of similar magnitude to the warm temperatures recorded since the late 20th century. A sharp transition from cold conditions in the late 18th century (t1781–1810 = −1.15 °C ± 0.64 °C) to warm conditions in the early 19th century (t1818–1847 = −0.06 °C ± 0.49 °C) is centered around the 1815 Tambora eruption (t1816 = −2.1 °C ± 0.55 °C). The new reconstruction from southern Spain correlates significantly with high-resolution temperature histories from the Pyrenees located ~600 km north of the Cazorla Natural Park, an association that is temporally stable over the past 650 years (r1350–2005 > 0.3, p < 0.0001) and particularly strong in the high-frequency domain (rHF > 0.4). Yet, only a few of the reconstructed cold extremes (1453, 1601, 1816) coincide with large volcanic eruptions, suggesting that the severe cooling events in southern Spain are controlled by internal dynamics rather than external (volcanic) forcing.

Holocene vegetation and climate change recorded in alpine bog sediments from the Borreguiles de la Virgen, Sierra Nevada, southern Spain

2012 ◽  
Vol 77 (1) ◽  
pp. 44-53 ◽  
Author(s):  
Gonzalo Jiménez-Moreno ◽  
R. Scott Anderson
Keyword(s):  
Climate Change ◽  
Magnetic Susceptibility ◽  
High Resolution ◽  
Sierra Nevada ◽  
High Elevation ◽  
High Impact ◽  
Southern Spain ◽  
Pollen Record ◽  
Arboreal Pollen ◽  
Vegetation And Climate

High-resolution pollen and magnetic susceptibility (MS) analyses have been carried out on a sediment core taken from a high-elevation alpine bog area located in Sierra Nevada, southern Spain. The earliest part of the record, from 8200 to about 7000 cal yr BP, is characterized by the highest abundance of arboreal pollen andPediastrum, indicating the warmest and wettest conditions in the area at that time. The pollen record shows a progressive aridification since 7000 cal yr BP that occurred in two steps, first shown by a decrease inPinus, replaced by Poaceae from 7000 to 4600 cal yr BP and then by Cyperaceae,Artemisiaand Amaranthaceae from 4600 to 1200 cal yr BP.Pediastrumalso decreased progressively and totally disappeared at ca. 3000 yr ago. The progressive aridification is punctuated by periodically enhanced drought at ca. 6500, 5200 and 4000 cal yr BP that coincide in timing and duration with well-known dry events in the Mediterranean and other areas. Since 1200 cal yr BP, several changes are observed in the vegetation that probably indicate the high-impact of humans in the Sierra Nevada, with pasturing leading to nutrient enrichment and eutrophication of the bog,Pinusreforestation andOleacultivation at lower elevations.

Geochemical processes in a Mediterranean Lake: a high-resolution study of the last 4,000 years in Zoñar Lake, southern Spain

2009 ◽  
Vol 46 (3) ◽  
pp. 405-421 ◽  
Author(s):  
Celia Martín-Puertas ◽  
Blas L. Valero-Garcés ◽  
M. Pilar Mata ◽  
Ana Moreno ◽  
Santiago Giralt ◽  
...  
Keyword(s):  
High Resolution ◽  
Southern Spain ◽  
Geochemical Processes ◽  
Mediterranean Lake ◽  
Resolution Study
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