Linkages between atmospheric circulation, climate and streamflow in the northern North Atlantic : research prospects
Atlantic Ocean ; Atmospheric circulation ; Canada ; Climate ; Climate oscillation ; Climatic anomaly ; Iceland ; Model ; North Atlantic Ocean ; Northern Europe ; Ocean atmosphere interaction ; Precipitation ; Stream flow ; United States of America
Anomalie climatique ; Atlantique ; Atlantique Nord ; Canada ; Circulation atmosphérique ; Climat ; Ecoulement fluvial ; Etats-Unis ; Europe du Nord ; Interaction océan-atmosphère ; Islande ; Modèle ; Oscillation climatique ; Précipitation
The main focus lies with climatic and hydrologic implications of the major circulation patterns in the northern North Atlantic, namely the North Atlantic Oscillation (NAO) and Arctic Oscillation (AO). The studies reviewed here reveal key
relationships between circulation, climate and streamflow across the northern North Atlantic, allowing the construction of a simple conceptual model for this system. To help promote a better understanding of the system, several research gaps are identified
The understanding of North Atlanticclimate and the dual processes of global warming and Gulf Stream action which affect it, is as uncertain today as in the early 2000s. This paper will show how fast our ideas on future global and North Atlantic
climate are altering. The interaction of positive and negative feedbacks are key to our future climate. The impact of the thermohaline circulation and of the wind power and stronger westerlies are discussed. The worrying projections on future climate
change over the North Atlantic region remain subject to a high degree of uncertainty.
L'Oscillation de l'Atlantique Nord est une composante importante de la variabilité naturelle du climat. Cet article analyse brièvement les tendances et la variabilité de ce phénomène, ses impacts sur le climat, la prédiction du phénomène et les
Major change in Atlantic deep and bottom waters 700,000 yr ago: benthonic foraminiferal evidence from the South Atlantic
Analysis of the benthonic foraminiferal faunas in two sediment cores recovered from the Vema and Hunter Channels in the western South Atlantic shows that the level of the transition between deep and bottom waters shallowed sharply about 700,000 yr
ago. This rise indicates a sharp, sustained increase in the volume of bottom water flowing through the South Atlantic after this time. Prior to about 700,000 yr ago, the amount of Antarctic Bottom Water entering the western South Atlantic was greatly
reduced and Circumpolar Deep Water apparently accounted for the bulk of northward flow. Production of southward-flowing North Atlantic Deep Water seems not to have been affected. The timing of this change in circulation regime suggests a possible causal
link to similar changes in records of terrestrial and sea-surface climate.
Discussion of the results of the investigations of organic matter in the SW Atlantic, in the Polar Frontal Zone. The present goal was organic matter distribution at the period of its accumulation and bacterioplankton activization anomalously warm
Unstable behavior of the Laurentide ice sheet over deforming sediment and its implications for climate change
Arctic Region ; Atlantic Ocean ; C 14 dating ; Climatic variation ; Cold area ; Ice sheet ; Meltwater ; North Atlantic Ocean ; Quaternary
climate in the North Atlantic region by controlling variable fluxes of icebergs and meltwater, as well as meltwater routing.
The A. proposes that rapid oscillations of the Laurentide ice sheet margin are not climatic in origin but instead reflect inherent instability associated with deforming sediment dynamics. Such behavior would have played a critical role in affecting
Correlation of Late-Pleistocene lake-level oscillations in Mono Lake, California, with North Atlanticclimate events
C 14 dating ; California ; Climatic variation ; Correlation ; Lacustrine sediment ; Lake level ; Marine sediment ; North Atlantic Ocean ; Oxygen 18 ; Palaeogeography ; Pleistocene ; Quaternary ; United States of America
in the climate of the North Atlantic region.
In this study, the AA. have employed paleomagnetic secular variation (PSV) data obtained on North Atlantic and Mono Lake sediments as well as O 18 and total inorganic carbon (TIC) measurements of Mono Lake sediments to show that lowstands of Mono
Lake occurred during Heinrich events H1, H2, and H4. These results enforce the concept that relatively dry-wet oscillations in the climate of the Great Basin of the western United States occurred at approximately the same times as cold-warm oscillations
Africa ; Atlantic Ocean ; Atmospheric dynamics ; Climatic warming ; Holocene ; Meltwater ; Monsoon ; North Atlantic Ocean ; Ocean atmosphere interaction ; Palaeoclimate ; Precipitation ; South Atlantic Ocean ; Surface temperature ; Surface water
The deglacial pattern of a high-resolution alkenone-derived temperature record from the southeastern tropical Atlantic was compared with one from the northeastern subtropical Atlantic. During Termination 1b, surface waters in the eastern tropical
Atlantic (6°S) reached modern temperatures, whereas those in the subtropical northeastern Atlantic (21°N) were still considerably colder than today. This asymmetrical warming may reflect meltwater-induced reductions in the northward heat transport and helps
Synchronism of Holocene East Asian monsoon variations and North Atlantic drift-ice tracers
Aeolian features ; Atlantic Ocean ; Beijing ; C 14 dating ; China ; Correlation ; Holocene ; Monsoon ; North Atlantic Ocean ; Ocean atmosphere interaction ; Palaeoclimatology ; Palaeosol ; Quaternary
the full span of Holocene time implies a close relationship between North Atlanticclimate and the monsoon climate of central China.
. The monsoon variations correlate closely with variations in North Atlantic drift-ice tracers that represent episodic advection of drift ice and cold polar surface water southward and eastward into warmer subpolar water. The correspondence of these records over
Younger Dryas research and its implications for understanding abrupt climatic change
Atlantic Ocean ; Climatic variation ; Glacial features ; Meltwater ; Model ; North Atlantic Ocean ; Ocean atmosphere interaction ; Ocean circulation ; Palaeoclimatology ; Quaternary
This article reviews research on the Younger Dryas event and discusses the implications of this research for understanding the role of the North Atlantic Ocean in abrupt climatic change. The Younger Dryas has been linked with a large-scale shift
of the North Atlantic thermohaline circulation (THC) to a near glacial mode with a consequent reduction in northward heat transport. This shift in the THC may have been triggered by a discharge of Laurentide ice, combined with meltwater inputs from several
, in situ assessment of the phase relationship between the North Atlanticclimate system and vegetation changes on the adjacent landmass. This demonstrates for the first time that variability in NW Iberian tree population closely tracked millennial-scale
A deep-sea sediment core from the western Portuguese margin has provided a continuous, high-resolution record of millennial-scale climatic oscillations during the interval 9000-65,000 yr B.P. Pollen analysis of the same sequence allows direct
Marine records from the Reykjanes Ridge indicate ice sheet variations and abrupt climate changes. In this paper, sedimentological, micropaleontological, and paleoceanographic records from cores of the northwestern North Atlantic, north of the area
of main IRD deposition, are presented. Changes in planktonic foraminifer and coccolith assemblages are monitored, in order to determine the varying advection of warmer surface waters and their role in climate changes in the northern hemisphere through
Accelerator-mass-spectrometer ages for the Younger Dryas event in Atlantic Canada
C14 dating ; Canada ; Climatic cooling ; Lacustrine sediment ; New Brunswick ; Nova Scotia ; Palaeogeography ; Palynology ; Pollen diagram ; Quaternary ; Stratigraphy
The AA. present the first accelerator-mass-spectrometer (AMS) 14C dates from Atlantic Canada, at or close to the boundaries of this late glacial cooling, from six sites in New Brunswick and Nova Scotia. The results place the timing of the Younger
Dryas event in Atlantic Canada closer in line with the traditional chronozone boundaries of 11 000 and 10 000 yr B.P. in Northwest Europe.
Climatic impact on isovolumetric weathering of a coarse-grained schist in the northern Piedmont Province of the central Atlantic States
The possible impact of periglacial climates on the rate of chemical weathering of a coarse-grained plagioclase-muscovite-quartz schist has been determined for a small watershed near Baltimore, Maryland. The results suggested by the chemical
weathering rates indicates a need to reconsider theories of landscape evolution as they apply to the northern Piedmont Province of the mid-Atlantic states.
Tropical rain forest and climate dynamics of the Atlantic lowland, southern Brazil, during the late Quaternary
The AA. present results of an investigation into past vegetation and climate in the southern Atlantic rain forest region, using pollen and radiocarbon analysises of recently discovered late Pleistocene deposits at Volta Velha, Santa Catarina, Brazil.