Influence of the Arctic Oscillation on the Formation of Water Circulation Regimes in the Sector of the North, Norwegian and Barents Seas

The article studies the influence of wind forcing associated with the Arctic Oscillation on the water circulation regimes in the sector of the World Ocean (65–81.5 N, 0–70 E), which consolidates the North, Norwegian and Barents Seas. The study aims at establishing quantitative patterns of variability of the ocean level and surface geostrophic current velocities depending on the value of the Arctic Oscillation index. In general, the response of the sea level averaged over the ocean sector under consideration is in an antiphase with this index. However, there are periods of mismatch between antiphase fluctuations of the sea level and the Arctic Oscillation index. After 2009, an increase in the amplitude and a decrease in the duration of the phases of the Arctic Oscillation index are noted. The difference between the areas of positive and negative values of sea level anomalies creates a pressure gradient that causes surface geostrophic currents carrying Atlantic waters along the shelf edge eastward in a cyclonic regime (the Arctic Oscillation index is greater than 0) and westward in an anticyclonic regime (the index is less than 0). The article provides estimates of the linear regression coefficients: for the sea level they are ~ 2 cm in the shelf zone and about minus 1 cm in the deep-water part of the sector. Thus, the level difference between the shelf and the deeper part of the considered water area is ~ 3 cm per 1 unit of the Arctic Oscillation index. Estimates of the linear regression coefficients for anomalies of the geostrophic currents velocity were ~ 0.5 cm/s per 1 unit of the index. Analysis of the longterm variability of the steric component of the ocean level showed a better relationship with the interannual variability of the Arctic Oscillation index as compared to the ocean level.

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The North Atlantic Oscillation and the Arctic Oscillation favour harmful algal blooms in SW Europe

Harmful Algae ◽

10.1016/j.hal.2014.07.008 ◽

2014 ◽

Vol 39 ◽

pp. 121-126 ◽

Cited By ~ 8

Author(s):

José C. Báez ◽

Raimundo Real ◽

Victoria López-Rodas ◽

Eduardo Costas ◽

A. Enrique Salvo ◽

...

Keyword(s):

North Atlantic Oscillation ◽

North Atlantic ◽

Harmful Algal Blooms ◽

Algal Blooms ◽

Arctic Oscillation ◽

The Arctic ◽

The North ◽

The North Atlantic ◽

The Arctic Oscillation ◽

The North Atlantic Oscillation

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The influence of Arctic air masses on climatic conditions of the snow accumulation period in the center of the European territory of Russia

Арктика и Антарктика ◽

10.7256/2453-8922.2021.1.35112 ◽

2021 ◽

pp. 16-25

Author(s):

Julia Nikolaevna Chizhova

Keyword(s):

North Atlantic ◽

Arctic Oscillation ◽

Winter Precipitation ◽

Climatic Conditions ◽

The Arctic ◽

Air Masses ◽

The North ◽

The Arctic Oscillation ◽

The North Atlantic Oscillation ◽

The Relationship

The subject of this article is exmination of the influence of the Arctic air flow on the climatic conditions of the winter period in the center of the European territory of Russia (Moscow). In recent years, the question of the relationship between regional climatic conditions and such global circulation patterns as the North Atlantic Oscillation (NAO) and the Arctic Oscillation (AK) has become increasingly important. Based on the data of long-term observations of temperature and precipitation, the relationship with the AK and NAO was considered. For the winter months of the period 2014-2018, the back trajectories of the movement of air masses were computed for each date of precipitation to identify the sources of precipitation. The amount of winter precipitation that forms the snow cover of Moscow has no connection with either the North Atlantic Oscillation or the Arctic Oscillation. The Moscow region is located at the intersection of the zones of influence of positive and negative phases of both cyclonic patterns (AK and NAO), which determine the weather in the Northern Hemisphere. For the winter months, a correlation between the surface air temperature and NAO (r = 0.72) and AK (r = 0.66) was established. Winter precipitation in the center of the European territory of Russiais mainly associated with the unloading of Atlantic air masses. Arctic air masses relatively rarely invade Moscow region and bring little precipitation (their contribution does not exceed 12% of the total winter precipitation).

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Arctic Sea Level and Surface Circulation Response to the Arctic Oscillation

Geophysical Research Letters ◽

10.1029/2018gl078386 ◽

2018 ◽

Vol 45 (13) ◽

pp. 6576-6584 ◽

Cited By ~ 12

Author(s):

Thomas W. K. Armitage ◽

Sheldon Bacon ◽

Ron Kwok

Keyword(s):

Sea Level ◽

Arctic Oscillation ◽

The Arctic ◽

Surface Circulation ◽

Arctic Sea ◽

The Arctic Oscillation

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Analysis of the Standardized Precipitation Evapotranspiration Index over Iraq and its relationship with the Arctic Oscillation Index

Hydrological Sciences Journal ◽

10.1080/02626667.2020.1854765 ◽

2020 ◽

Author(s):

Omar M. A. Mahmood Agha ◽

Yousif H. Al-Aqeeli

Keyword(s):

Arctic Oscillation ◽

The Arctic ◽

Standardized Precipitation Evapotranspiration Index ◽

Arctic Oscillation Index ◽

The Arctic Oscillation

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Reconsideration of the True versus Apparent Arctic Oscillation

Journal of Climate ◽

10.1175/2007jcli2167.1 ◽

2008 ◽

Vol 21 (10) ◽

pp. 2047-2062 ◽

Cited By ~ 15

Author(s):

Hisanori Itoh

Keyword(s):

Spatial Correlation ◽

Arctic Oscillation ◽

Physical Reality ◽

The Arctic ◽

Sea Level Pressure ◽

The North ◽

The Pacific ◽

The Arctic Oscillation ◽

The North Atlantic Oscillation ◽

Almost All

Abstract The physical reality of the Arctic Oscillation (AO; or northern annular mode) is considered. The data used are mainly the monthly mean sea level pressure (SLP). A schematic figure is first presented to illustrate the relationship between the North Atlantic Oscillation (NAO)–Pacific–North American Oscillation (PNA) system and the AO–negative correlation mode between the Atlantic and the Pacific (AO–NCM) system. Although the NAO–PNA (apparent AO–NCM) and true AO–NCM systems give rise to the same EOFs, the probability density functions for the time coefficients of the two leading modes are different. Therefore, the discrimination of the two systems is possible. Several pieces of evidence indicate that, in the real world, the NAO–PNA and the AO–NCM are located on almost the same plane in phase space. This means that the NAO–PNA and AO–NCM systems have the same variations on the plane in common, implying that when the NAO–PNA system is real, the AO–NCM is unlikely to be real. Simple independent component analysis is carried out to distinguish between the true and apparent AO–NCM systems, indicating that the NAO and PNA are independent oscillations, that is, true ones. The analysis is extended to the winter mean SLP field, for which the EOF shows the NAO–PNA but not the AO–NCM. This may be due to the fact that the winter mean NAO and PNA patterns have little spatial correlation. Calculations using randomly selected samples also indicate that when the NAO and PNA patterns have little spatial correlation, the AO never appears as EOF1. All the preceding results show that almost all characteristics of the AO–NCM can be explained from those of the NAO–PNA. Hence it is concluded that the AO, which is extracted by EOF analysis from the temporarily independent but spatially overlapping variations of the NAO and PNA, is almost apparent.

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Where can the Arctic oscillation be reconstructed? Towards a reconstruction of climate modes based on stable teleconnections

Climate of the Past Discussions ◽

10.5194/cpd-1-17-2005 ◽

2005 ◽

Vol 1 (1) ◽

pp. 17-56 ◽

Cited By ~ 15

Author(s):

G. Lohmann ◽

N. Rimbu ◽

M. Dima

Keyword(s):

Arctic Oscillation ◽

Ice Core ◽

The Arctic ◽

Boreal Winter ◽

Arctic Oscillation Index ◽

Climate Modes ◽

Teleconnection Patterns ◽

Temperature And Precipitation ◽

The Arctic Oscillation ◽

Coral Tree

Abstract. Proxy data can bring observed climate variability of the last 100 years into a long-term context. We identify regions of the Northern Hemisphere where the teleconnection patterns of the Arctic Oscillation are stationary. Our method provides a systematic way to examine optimal sites for the reconstruction of climate modes based on paleoclimatic archives that sensitively record temperature and precipitation variations. We identify the regions for boreal winter and spring that can be used to reconstruct the Arctic Oscillation index in the pre-instrumental period. Finally, this technique is applied to high resolution coral, tree ring, ice core and mollusk shell data to understand proxy-climate teleconnections and their use for climate reconstructions.

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Chaotic Properties of the Arctic Oscillation Index

SOLA ◽

10.2151/sola.2011-009 ◽

2011 ◽

Vol 7 ◽

pp. 33-36 ◽

Cited By ~ 13

Author(s):

Yoshito Hirata ◽

Yuko Shimo ◽

Hiroshi L. Tanaka ◽

Kazuyuki Aihara

Keyword(s):

Arctic Oscillation ◽

The Arctic ◽

Arctic Oscillation Index ◽

The Arctic Oscillation

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Palynological evidence of Holocene climate change in the eastern Arctic: a possible shift in the Arctic oscillation at the millennial time scaleThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network.

Canadian Journal of Earth Sciences ◽

10.1139/e08-043 ◽

2008 ◽

Vol 45 (11) ◽

pp. 1363-1375 ◽

Cited By ~ 31

Author(s):

David Ledu ◽

André Rochon ◽

Anne de Vernal ◽

Guillaume St-Onge

Keyword(s):

Arctic Ocean ◽

Arctic Oscillation ◽

North Atlantic Ocean ◽

Sediment Cores ◽

Sea Surface ◽

The Arctic ◽

Last Deglaciation ◽

Holocene Climate ◽

The North ◽

The Arctic Oscillation

Dinocyst assemblages and the physical properties of two sediment cores collected in the easternmost part of the main axis of the Northwest Passage, Canadian Arctic Ocean (cores 2004-804-009 BC and 2004-804-009 PC, 74°11.2′N, 81°11.7′W) were used to reconstruct changes in sea-surface conditions and to characterize changes in the depositional environment. Core 2004-804-009 PC spans the last 12 180 calibrated (cal) years BP, with sedimentation rates ranging from 45 to 122 cm/ka. Quantitative estimates of sea-surface parameters reveal relatively large hydrographic variability at millennial time scale. Before 11 000 cal years BP, our records suggest terrigenous inputs related to the last deglaciation. Between 11 000 and 9600 cal years BP, harsh conditions prevailed with August sea-surface temperatures <2 °C and the dominance of heterotrophic taxa. This episode was followed by a gradual increase in the relative abundance of phototrophic taxa and the establishment of milder condition with sea-surface temperature (SST) reaching ∼2 °C ∼8300 cal years BP, possibly related to increased exchange between the Arctic Ocean and the North Atlantic Ocean. From 6000 cal years BP to the late Holocene, climate variability could be the results of changes in the synoptic-scale atmospheric pattern such as the Arctic oscillation.

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