Heinrich event 4 characterized by terrestrial proxies in southwestern Europe

Abstract. Heinrich event 4 (H4) is well documented in the North Atlantic Ocean as a cooling event that occurred between 39 and 40 Ka. Deep-sea cores around the Iberian Peninsula coastline have been analysed to characterize the H4 event, but there are no data on the terrestrial response to this event. Here we present for the first time an analysis of terrestrial proxies for characterizing the H4 event, using the small-vertebrate assemblage (comprising small mammals, squamates and amphibians) from Terrassa Riera dels Canyars, an archaeo-palaeontological deposit located on the seaboard of the northeastern Iberian Peninsula. This assemblage shows that the H4 event is characterized in northeastern Iberia by harsher and drier terrestrial conditions than today. Our results were compared with other proxies such as pollen, charcoal, phytolith, avifauna and large-mammal data available for this site, as well as with the general H4 event fluctuations and with other sites where H4 and the previous and subsequent Heinrich events (H5 and H3) have been detected in the Mediterranean and Atlantic regions of the Iberian Peninsula. We conclude that the terrestrial proxies follow the same patterns as the climatic and environmental conditions detected by the deep-sea cores at the Iberian margins.

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Heinrich Event 4 characterized by terrestrial proxies in southwestern Europe

Climate of the Past Discussions ◽

10.5194/cpd-9-647-2013 ◽

2013 ◽

Vol 9 (1) ◽

pp. 647-681 ◽

Cited By ~ 1

Author(s):

J. M. López-García ◽

H.-A. Blain ◽

M. Bennàsar ◽

M. Sanz ◽

J. Daura

Keyword(s):

Iberian Peninsula ◽

North Atlantic ◽

Deep Sea ◽

North Atlantic Ocean ◽

The North ◽

Heinrich Event ◽

The North Atlantic ◽

Small Vertebrate ◽

Vertebrate Assemblage ◽

First Time

Abstract. Heinrich Event 4 (H4) is well documented in the North Atlantic Ocean as a cooling event that occurred between 39 000 and 40 000 yr BP. Deep-sea cores around the Iberian Peninsula coastline have been analysed to characterize the H4 event, but there are no data on the terrestrial response to this event. Here we present for the first time an analysis of terrestrial proxies for characterizing the H4 event, using the small-vertebrate assemblage (comprising small mammals, squamates and amphibians) from Terrassa Riera dels Canyars, an archaeo-palaeontological deposit located on the seaboard of the northeastern Iberian Peninsula. This assemblage shows that the H4 event is characterized in northeastern Iberia by harsher and drier terrestrial conditions than today. Our results were compared with other proxies such as pollen, charcoal, phytolith, avifauna and large-mammal data available for this site, as well as with the general H4 event fluctuations and with other sites where H4 and the previous and subsequent Heinrich events (H5 and H3) have been detected in the Mediterranean and Atlantic regions of the Iberian Peninsula. We conclude that the terrestrial proxies follow the same patterns as the climatic and environmental conditions detected by the deep-sea cores at the Iberian margins.

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DEEP-SEA MYSIDS FROM THE NORTH ATLANTIC OCEAN WITH DESCRIPTION OF FOUR NEW SPECIES

Crustaceana ◽

10.1163/156854099503366 ◽

1999 ◽

Vol 72 (3) ◽

pp. 273-295 ◽

Cited By ~ 4

Author(s):

Masaaki Murano ◽

John Mauchline

Keyword(s):

New Species ◽

Atlantic Ocean ◽

North Atlantic ◽

Deep Sea ◽

North Atlantic Ocean ◽

Stomach Contents ◽

Pelagic Species ◽

The North ◽

The North Atlantic ◽

First Time

AbstractSeven species of Erythropini from the northeast Atlantic and one from the northwest Atlantic are dealt with. Four are described as new species, and three are new to science but remain unnamed because of mutilated condition. A known species Katerythrops oceanae, is described for the first time for the male pleopods and a revision of the diagnosis of the genus is presented. Five are pelagic species while three were obtained from the stomach contents of demersal fishes. Huit especes d'Erythropini de l'Atlantique sont traitees, dont sept du nord-est et une du nordouest de cet ocean. Quatre sont decrites comme nouvelles et trois sont nouvelle pour la science, mais non nommees en raison de leur condition mutilee. Les pleopodes males d'un espece connue, Katerythrops oceanae, sont decrits pour la premiere fois et la diagnose du genre est revisee. Cinq especes sont pelagiques et trois proviennent de contenus stomacaux de poissons demersaux.

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A review of the genus Iridogorgia (Octocorallia: Chrysogorgiidae) and its relatives, chiefly from the North Atlantic Ocean

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s002531540705535x ◽

2007 ◽

Vol 87 (2) ◽

pp. 393-402 ◽

Cited By ~ 16

Author(s):

Les Watling

Keyword(s):

New Species ◽

Atlantic Ocean ◽

New England ◽

North Atlantic ◽

Deep Sea ◽

New Genus ◽

Growth Form ◽

North Atlantic Ocean ◽

The North ◽

The North Atlantic

Exploration of the New England and Corner Rise Seamounts produced four new species of chrysogorgiid octocorals with the spiral iridogorgiid growth form. Three species are described as new in the genus Iridogorgia and one is described in the new genus Rhodaniridogorgia. Both genera have representatives in the Atlantic and Pacific Oceans. Iridogorgia magnispiralis sp. nov., is one of the largest octocorals encountered in the deep sea and seems to be widespread in the Atlantic.

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First record of the rare deep-sea polychaete Rhamphobrachium (Rhamphobrachium) agassizii (Annelida: Onuphidae) in European waters

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315420000673 ◽

2020 ◽

Vol 100 (5) ◽

pp. 719-724

Author(s):

Andrés Arias ◽

Hannelore Paxton

Keyword(s):

North Atlantic ◽

Deep Sea ◽

North Atlantic Ocean ◽

First Record ◽

Polychaete Species ◽

Azores Archipelago ◽

The North ◽

Deep Water Species ◽

The North Atlantic ◽

Water Species

AbstractRhamphobrachium (Rhamphobrachium) agassizii is reported from the Cantabrian Sea, Spain, from depths of 925–1207 m. This is its first record off the Iberian Peninsula and in European waters, representing its northernmost distribution in the North Atlantic Ocean to date. Previous reports of R. (R.) agassizii from the eastern and western North Atlantic demonstrate its apparent amphi-Atlantic distribution, which appears consistent with the distribution of the main Atlantic currents. It is a typical deep-water species with its deepest record at 2165 m from the Azores archipelago. The specimens were collected singly at two stations, attesting to the rarity of the species in contrast to its congener R. (Spinigerium) brevibrachiatum which was the most dominant polychaete species in a previous study.

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Remarks on the deep-sea genus Pseudolamprops (Cumacea: Lampropidae)

Zootaxa ◽

10.11646/zootaxa.3542.1.3 ◽

2012 ◽

Vol 3542 (1) ◽

pp. 69 ◽

Cited By ~ 1

Author(s):

DANIEL ROCCATAGLIATA ◽

UTE MÜHLENHARDT-SIEGEL

Keyword(s):

Adult Female ◽

North Atlantic ◽

Deep Sea ◽

New Records ◽

New Combination ◽

The North ◽

New Material ◽

The North Atlantic ◽

The Antarctic ◽

First Time

Based on two specimens collected in the Antarctic deep-sea (4928 m) the adult female and male of the genusPseudolamprops Gamô, 1989 are described for the first time. A new combination is proposed, Pseudolamprops profundus(Reyss, 1978) comb. nov., and several new records from the North Atlantic and Antarctica are provided. The diagnosis of Pseudolamprops is revised on the account of the new material available.

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Disentangling the effect of ocean temperatures and isotopic content on the oxygen – isotope signals in the North Atlantic Ocean during Heinrich Event 1 using a global climate model

10.5194/cp-2016-31 ◽

2016 ◽

Author(s):

Marianne Bügelmayer-Blaschek ◽

Didier M. Roche ◽

Hans Renssen ◽

Claire Waelbroeck

Keyword(s):

Atlantic Ocean ◽

Surface Temperature ◽

Isotopic Composition ◽

Sea Surface Temperature ◽

North Atlantic ◽

North Atlantic Ocean ◽

Sea Surface ◽

The North ◽

Heinrich Event ◽

The North Atlantic

Abstract. Heinrich events are intriguing episodes of enhanced iceberg discharge occurring during the last glacial period and are characterized by a steep increase in ice rafted debris (IRD) found in North Atlantic cores. Yet, their signal is not directly recognizable in the carbonate oxygen isotopic composition recorded in planktonic foraminifera, which depends on both the prevailing temperature and isotopic composition of seawater. Using the global isotope-enabled climate – iceberg model iLOVECLIM we performed three experiments to shed light on first, the impact of the duration of a Heinrich event-like iceberg forcing on the North Atlantic Ocean and second, the mechanisms behind the simulated δ18Ocalcite pattern. We applied an iceberg forcing of 0.2 Sv for 300, 600 and 900 years, respectively, and find a strong and non-linear response of the Atlantic Meridional Overturning Circulation (AMOC) to the duration of the Heinrich event in iLOVECLIM. Moreover, our results show that the timing of the first response to the iceberg forcing coincides between all the experiments in the various regions and happens within 300 years. Furthermore, the experiments display two main patterns in the δ18Ocalcite signal. On the one hand, the central and northeast North Atlantic regions display almost no response in δ18Ocalcite to the applied iceberg forcing since the changes in sea surface temperature and δ18Oseawater compensate each other or, if the forcing is applied long enough, a delayed response is seen. On the other hand, we show that in Baffin Bay, the Nordic Seas and the subtropical North Atlantic the change in δ18Oseawater exceeds the sea surface temperature signal and there the δ18Ocalcite pattern closely follows the δ18Oseawater signal and displays a continuous decrease over the length of the Heinrich event with the minimum value at the end of the iceberg release. The comparison of the model experiments with four marine sediment cores indicates that the experiment with an iceberg forcing of 0.2 Sv for 300 years yields the most reasonable results.

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Detecting quasi-oscillations in the monthly precipitation regimes of the Iberian Peninsula

Annales Geophysicae ◽

10.5194/angeo-21-819-2003 ◽

2003 ◽

Vol 21 (3) ◽

pp. 819-832 ◽

Cited By ~ 9

Author(s):

L. Morala ◽

A. Serrano ◽

J. A. Garcia

Keyword(s):

Time Series ◽

High Pressure ◽

Iberian Peninsula ◽

North Atlantic ◽

North Atlantic Ocean ◽

Singular Spectrum Analysis ◽

Monthly Precipitation ◽

The North ◽

Precipitation Regimes ◽

The North Atlantic

Abstract. A spectral analysis of the time series corresponding to the main monthly precipitation regimes of the Iberian Peninsula was performed using two methods, the Multi-Taper Method and Monte Carlo Singular Spectrum Analysis. The Multi-Taper Method gave a preliminary view of the presence of signals in some of the time series. Monte Carlo Singular Spectrum Analysis discriminated between potential oscillations and noise. From the results of the two methods it is concluded that there exist three significant quasi-oscillations at the 95% level of confidence: a 5.0 year quasi-oscillation and a long-term trend in the Atlantic pattern of March, a 3.2 year quasi-oscillation in the Cantabrian pattern of January, and a 4.0 year quasi-oscillation in the Catalonian pattern of February. These quasi-oscillations might be related to climatic variations with similar periodicities over the North Atlantic Ocean. The possible simultaneity of high values of precipitation generated by the significant quasi-oscillations and high sea–level pressures was studied by means of composite maps. It was found that high values of precipitation generated by the oscillations of the Atlantic patterns of January and March exist simultaneously with a specific high pressure structure over the North Atlantic Ocean, that allow cyclonic perturbations to cross the Iberian Peninsula. During the non-wet years, this high pressure structure moves northwards, keeping the track of the low pressure centers to the north, far from the Iberian Peninsula. On the other hand, high values of precipitation generated by the oscillation of the Cantabrian pattern of January exist simultaneously with a high pressure structure over the Galicia region and the Cantabrian Sea, that allow a northerly flow over the region. Also, a positive trend in the NAO index for March has been found, starting in the sixties, which is not evident for other winter months. This trend agrees with the decreasing trend found in the March Atlantic pattern.Key words. Meteorology and atmospheric dynamics (climatology; precipitation) Oceanography: general (climate and interannual variability)

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Calpionellid Stratigraphy in Sediments across the Jurassic/ Cretaceous Boundary offshore Morocco (Deep Sea Drilling Project Leg 79) and Their Distribution in the North Atlantic Ocean

10.2973/dsdp.proc.79.124.1984 ◽

1984 ◽

Author(s):

J. Azema ◽

M. Jaffrezo

Keyword(s):

Atlantic Ocean ◽

North Atlantic ◽

Deep Sea ◽

North Atlantic Ocean ◽

The North ◽

The North Atlantic ◽

Drilling Project

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Radionuclides in deep-sea fish and other organisms from the North Atlantic Ocean

ICES Journal of Marine Science ◽

10.1093/icesjms/fsq088 ◽

2010 ◽

Vol 68 (2) ◽

pp. 333-340 ◽

Cited By ~ 26

Author(s):

Fernando P. Carvalho ◽

João M. Oliveira ◽

Margarida Malta

Keyword(s):

North Atlantic ◽

Deep Sea ◽

North Atlantic Ocean ◽

Radiation Doses ◽

Anthropogenic Radionuclides ◽

The North ◽

Naturally Occurring ◽

Naturally Occurring Radionuclides ◽

The North Atlantic ◽

Sea Fish

Abstract Carvalho, F. P., Oliveira, J. M., and Malta, M. 2011. Radionuclides in deep-sea fish and other organisms from the North Atlantic Ocean – ICES Journal of Marine Science, 68: 333–340. The naturally occurring radionuclides potassium-40 (40K), radium-226 (226Ra), polonium-210 (210Po), and lead-210 (210Pb) were measured in commercial fish species such as cod, halibut, redfish, and shark from several fishing grounds in the North Atlantic, as well as the anthropogenic radionuclides caesium-137 (137Cs) and plutonium isotopes (238Pu and 239+240Pu). The concentrations of naturally occurring radionuclides were compared with those of anthropogenic origin. The main contributors to the radiation dose were 210Po and 40K, with anthropogenic radionuclides accounting for just a small contribution. We provide the first measurements of naturally occurring radionuclides in abyssal organisms, including fish, molluscs, and crustaceans, from the Porcupine Abyssal Plain. In these organisms, radionuclide concentrations and the absorbed radiation doses were dominated by 210Po and were comparable with those determined in related coastal species, confirming that the deep-sea fauna do not live in an environment protected from ionizing radiation. Absorbed radiation doses from naturally occurring radionuclides still exceed radiation doses caused by anthropogenic radionuclides introduced into the Northeast Atlantic.

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