History of the last deglaciation in the alboran sea (western Mediterranean) and adjacent north Atlantic as revealed by coccolith floras

1988 ◽  
Vol 64 (1-2) ◽  
pp. 35-42 ◽  
Author(s):  
P.P.E. Weaver ◽  
C. Pujol
Keyword(s):  
North Atlantic ◽  
Western Mediterranean ◽  
Last Deglaciation ◽  
Alboran Sea ◽  
History Of ◽  
The Last Deglaciation ◽  
Alborán Sea

scholarly journals Abrupt climate changes of the last deglaciation detected in a Western Mediterranean forest record

2010 ◽  
Vol 6 (2) ◽  
pp. 245-264 ◽  
Author(s):  
W. J. Fletcher ◽  
M. F. Sanchez Goñi ◽  
O. Peyron ◽  
I. Dormoy
Keyword(s):  
High Latitude ◽  
Western Mediterranean ◽  
Mediterranean Forest ◽  
Precipitation Pattern ◽  
Last Deglaciation ◽  
Alboran Sea ◽  
Forest Development ◽  
Modern Analogue ◽  
The Last Deglaciation ◽  
Alborán Sea

Abstract. Abrupt changes in Western Mediterranean climate during the last deglaciation (20 to 6 cal ka BP) are detected in marine core MD95-2043 (Alboran Sea) through the investigation of high-resolution pollen data and pollen-based climate reconstructions by the modern analogue technique (MAT) for annual precipitation (Pann) and mean temperatures of the coldest and warmest months (MTCO and MTWA). Changes in temperate Mediterranean forest development and composition and MAT reconstructions indicate major climatic shifts with parallel temperature and precipitation changes at the onsets of Heinrich stadial 1 (equivalent to the Oldest Dryas), the Bölling-Allerød (BA), and the Younger Dryas (YD). Multi-centennial-scale oscillations in forest development occurred throughout the BA, YD, and early Holocene. Shifts in vegetation composition and (Pann reconstructions indicate that forest declines occurred during dry, and generally cool, episodes centred at 14.0, 13.3, 12.9, 11.8, 10.7, 10.1, 9.2, 8.3 and 7.4 cal ka BP. The forest record also suggests multiple, low-amplitude Preboreal (PB) climate oscillations, and a marked increase in moisture availability for forest development at the end of the PB at 10.6 cal ka BP. Dry atmospheric conditions in the Western Mediterranean occurred in phase with Lateglacial events of high-latitude cooling including GI-1d (Older Dryas), GI-1b (Intra-Allerød Cold Period) and GS-1 (YD), and during Holocene events associated with high-latitude cooling, meltwater pulses and N. Atlantic ice-rafting. A possible climatic mechanism for the recurrence of dry intervals and an opposed regional precipitation pattern with respect to Western-central Europe relates to the dynamics of the westerlies and the prevalence of atmospheric blocking highs. Comparison of radiocarbon and ice-core ages for well-defined climatic transitions in the forest record suggests possible enhancement of marine reservoir ages in the Alboran Sea by 200 years (surface water age 600 years) during the Lateglacial.

scholarly journals Abrupt climate changes of the last deglaciation detected in a western Mediterranean forest record

2009 ◽  
Vol 5 (1) ◽  
pp. 203-235 ◽  
Author(s):  
W. J. Fletcher ◽  
M. F. Sanchez Goñi ◽  
O. Peyron ◽  
I. Dormoy
Keyword(s):  
High Latitude ◽  
Western Mediterranean ◽  
Mediterranean Forest ◽  
Precipitation Pattern ◽  
Last Deglaciation ◽  
Alboran Sea ◽  
Water Age ◽  
Forest Development ◽  
Modern Analogue ◽  
Alborán Sea

Abstract. Evidence for abrupt changes in western Mediterranean climate between 20 and 6 cal ka BP is examined in marine core MD95-2043 (Alborán Sea), using pollen data for temperate Mediterranean forest development and pollen-based climate reconstructions using the modern analogue technique (MAT) for annual precipitation (Pann) and mean temperatures of the coldest and warmest months (MTCO and MTWA). Major climatic shifts with parallel temperature and precipitation changes occurred at the onsets of Heinrich Event 1 (equivalent to the Oldest Dryas), the Bölling-Allerød (BA), and the Younger Dryas (YD). Multi-centennial-scale oscillations in forest development related to regional precipitation (Pann) variability occurred throughout the BA, YD, and early Holocene, with drier atmospheric conditions in phase with Lateglacial events of high-latitude cooling including GI-1d (Older Dryas), GI-1b (Intra-Allerød Cold Period) and GS-1 (YD), and during Holocene events associated with high-latitude cooling, meltwater pulses and N. Atlantic ice-rafting (events at 11.4, 10.1, 9.3, 8.2 and 7.4 cal ka BP). The forest record also indicates multi-centennial variability within the YD interval and multiple Preboreal climate oscillations. A possible climatic mechanism for the recurrence of dry intervals and an opposed regional precipitation pattern with respect to western-central Europe relates to the dynamics of the jet stream and the prevalence of atmospheric blocking highs. Comparison of radiocarbon and ice-core ages for well-defined climatic transitions in the forest record suggests possible enhancement of marine reservoir ages in the Alborán Sea by ~200 years (surface water age ~600 years) during the Lateglacial.

scholarly journals Holocene hydrography evolution in the Alboran Sea: a multi-record and multi-proxy comparison

2019 ◽  
Vol 15 (3) ◽  
pp. 927-942 ◽  
Author(s):  
Albert Català ◽  
Isabel Cacho ◽  
Jaime Frigola ◽  
Leopoldo D. Pena ◽  
Fabrizio Lirer
Keyword(s):  
North Atlantic ◽  
Climatic Variability ◽  
Planktonic Foraminifera ◽  
Warming Trend ◽  
Western Mediterranean ◽  
Alboran Sea ◽  
The Holocene ◽  
Sst Variability ◽  
Peak Structure ◽  
Alborán Sea

Abstract. A new high-resolution deglacial and Holocene sea surface temperature (SST) reconstruction is presented for the Alboran Sea (western Mediterranean), based on Mg∕Ca ratios measured in the planktonic foraminifera Globigerina bulloides. This new record is evaluated by comparison with other Mg∕Ca SST records and previously published alkenone SST reconstructions from the same region for both the Holocene and glacial periods. In all cases there is a high degree of coherence between the different Mg∕Ca SST records but strong discrepancies when compared to the alkenone SST records. We argue that these discrepancies are due to differences in the proxy response during deglaciation which we hypothesize to reflect a resilience strategy of G. bulloides, changing its main growth season, and consequently Mg∕Ca records a shorter deglacial warming than alkenones. In contrast, short-term Holocene SST variability is larger in the Mg∕Ca SST than in the alkenone SST records. We propose that the larger Mg∕Ca SST variability is a result of spring temperatures variability, while the smoothed alkenone SST variability represents averaged annual temperatures. The Mg∕Ca SST record differentiates the Holocene into three periods: (1) the warmest SST values occurred during the Early Holocene (11.7–9 cal. kyr BP), (2) a continuous cooling trend occurred during the Middle Holocene that culminated in the coldest Holocene SST having a double cold peak structure centred at around 4.2 cal. kyr BP, and (3) the Late Holocene (4.2 cal. kyr BP to present) did not follow any clear cooling/warming trend although millennial-scale oscillations were enhanced. This SST evolution is discussed in the context of the changing properties in the Atlantic inflow water associated with North Atlantic circulation conditions and also with local hydrographical and atmospheric changes. We propose that a tight link between North Atlantic circulation patterns and the inflow of surface waters into the Mediterranean played a major role in controlling Holocene climatic variability of this region.

scholarly journals Holocene hydrography evolution in the Alboran Sea: a multi-record and multiproxy comparison

2018 ◽  
Author(s):  
Albert Català ◽  
Isabel Cacho ◽  
Jaime Frigola ◽  
Leopoldo D. Pena ◽  
Fabrizio Lirer
Keyword(s):  
North Atlantic ◽  
Climatic Variability ◽  
Planktonic Foraminifera ◽  
Warming Trend ◽  
Western Mediterranean ◽  
Alboran Sea ◽  
Double Peak Structure ◽  
Sst Variability ◽  
Peak Structure ◽  
Alborán Sea

Abstract. A new high resolution deglacial and Holocene Sea Surface Temperature (SST) reconstruction is presented for the Alboran Sea (western Mediterranean), based on Mg / Ca ratios measured in the planktonic foraminifera Globigerina bulloides. This new record is evaluated by comparison with other Mg / Ca–SST and previously published alkenone–SST reconstructions from the same region for both Holocene and glacial period. In all cases there is a high degree of coherence between the different Mg / Ca–SST records but strong discrepancies when compared to the alkenone–SST records. We argue that these discrepancies are due to differences in the proxy-response during deglaciation which we hypothesize to reflect a resilience strategy of G. bulloides changing its main growth season. In contrast, short-term Holocene SST variability is larger in the Mg / Ca–SST than in the alkenone–SST records. It is proposed that larger Mg / Ca–SST variability to be the result of spring season variability, while the smoothed alkenone–SST variability represents average annual temperatures. Mg / Ca–SST record differentiates the Holocene in three periods (1) The warmest SST values occurred during the Early Holocene (11.7–9 kyr BP); (2) During the middle Holocene occurred a continuous cooling trend that culminated with the coldest Holocene SST in a double peak structure centred at around 4.2 kyr BP; (3) The Late Holocene (4.2 kyr BP to the present) did not follow any clear cooling/warming trend but millennial-scale oscillations were enhanced. This SST evolution is discussed in the context of changing properties in the Atlantic inflow associated to North Atlantic circulation conditions and also to local hydrographical and atmospheric changes. To conclude, we propose a tight link between North Atlantic circulation patterns and inflow of surface waters into the Mediterranean playing a major role in the controls of Holocene climatic variability of this region.

Checklist of benthic marine Cyanoprokariota of Chafarinas Islands (Alboran Sea, Western Mediterranean). Catálogo de cianoprocariotas bentónicas marinas de las Islas Chafarinas (Mar de Alborán, Mediterráneo Occidental)

2013 ◽  
Vol 38 ◽  
pp. 182-186 ◽  
Author(s):  
Julio De la Rosa Álamos ◽  
María Altamirano ◽  
Marianela Zanolla
Keyword(s):  
Marine Algae ◽  
Western Mediterranean ◽  
Alboran Sea ◽  
Palabras Clave ◽  
Alborán Sea

Catálogo de cianoprocariotas bentónicas marinas de las Islas Chafarinas (Mar de Alborán, Mediterráneo Occidental) Keywords: Chafarinas Islands, Cyanoprokariota, marine algae, Alboran Sea. Palabras clave: Islas Chafarinas, Cyanoprokariotas, algas marinas, Mar de Alborán.

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