Extension to the North Atlantic oscillation using early instrumental pressure observations from Gibraltar and south‐west Iceland

Jones, Philip; Jónsson, Thórdur; Wheeler, Dennis

doi:10.1002/(sici)1097-0088(19971115)17:13<1433::aid-joc203>3.3.co;2-g

Cited by 659 publications

(926 citation statements)

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“…CET is highly correlated with the NAOI (Jones and Hulme 1997). Taking the regional reconstructions, there is a remarkable stability for the BB time series but a marked decrease in the correlation between CET and the GR reconstruction.…”

Section: Discussionmentioning

confidence: 91%

“…We chose the updated winter (December-March) NAOI of the years 1825-1978 defined by Jones et al (1997) to represent the climate signal of NAO (available online at http://www.cru.uea.ac. uk/ϳtimo/projpages/nao update.htm).…”

Section: Resultsmentioning

confidence: 99%

“…Obviously, the GR reconstruction is the most robust one Jones et al (1997). Respectively, GR, SC, BB, and SP refers to the reconstruction from Greenland, Scandinavia, British Isles and Belgium, and Spain.…”

Section: Resultsmentioning

confidence: 99%

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Scale-Dependent Reconstruction of the NAO Index

Timm¹,

Ruprecht²,

Kleppek³

2004

J. Climate

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A method is presented to reconstruct decadal variations of the North Atlantic Oscillation (NAO). The spectral characteristics of the NAO on time scales of decades and longer are of particular interest for the understanding of North Atlantic ocean-atmosphere interactions. The reconstruction is based on a transfer model calibration that uses bandpass-filtered time series. The maximum overlap discrete wavelet transform (MODWT) is applied for decomposing the time series variance into different time scales. A total of 43 proxies, including Greenland ice cores and European tree-ring chronologies, are selected and regionally grouped providing four independent reconstructions for the period 1700-1978. The mean reconstruction agrees well with two recently published reconstructions during most of the time period. However, there are considerable differences in the earliest part before 1750. Running correlations between the reconstructions indicate that time-dependent relations exist among the different NAO reconstructions. The results suggest that the geographical distribution of proxies strongly affects the reconstruction and could explain some of the apparent discrepancies among the reconstructions recently published in literature. In the early eighteenth century, external forcing (solar, volcanic) seems to mask the NAO signature within the proxies.

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Section: Discussionmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

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Scale-Dependent Reconstruction of the NAO Index

Timm¹,

Ruprecht²,

Kleppek³

2004

J. Climate

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“…We used the following indices: (Thompson & Wallace, 2001)), which also goes by the name of the North Atlantic Oscillation (NAO; (Hurrell, 1995)). The North Atlantic Oscillation (NAO) index is typically measured through variations in the normal pattern of lower atmospheric pressure over Iceland and higher pressure near the Azores and Iberian Peninsula (Jones et al, 1997). A positive NAO index refers to an increased difference in pressure between these two regions and thus stronger westerly winds.…”

Section: Climate Indicesmentioning

confidence: 99%

The response of African land surface phenology to large scale climate oscillations

Brown

Beurs

Vrieling

2010

Remote Sensing of Environment

124

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Variations in agricultural production due to rainfall and temperature fluctuations are a primary cause of food insecurity on the African continent. Analysis of changes in phenology can provide quantitative information on the effect of climate variability on growing seasons in agricultural regions. Using a robust statistical methodology, we describe the relationship between phenology metrics derived from the 26 year AVHRR NDVI record and the North Atlantic Oscillation index (NAO), the Indian Ocean Dipole (IOD), the Pacific Decadal Oscillation (PDO), and the Multivariate ENSO Index (MEI). We map the most significant positive and negative correlation for the four climate indices in Eastern, Western and Southern Africa between two phenological metrics and the climate indices. Our objective is to provide evidence of whether climate variability captured in the four indices has had a significant impact on the vegetative productivity of Africa during the past quarter century. We found that the start of season and cumulative NDVI were significantly affected by large scale variations in climate. The particular climate index and the timing showing highest correlation depended heavily on the region examined. In Western Africa the cumulative NDVI correlates with PDO in September-November. In Eastern Africa the start of the June-October season strongly correlates with PDO in March-May, while the PDO in December-February correlates with the start of the FebruaryJune season. The cumulative NDVI over this last season relates to the MEI of March-May. For Southern Africa, high correlations exist between SOS and NAO of September-November, and cumulative NDVI and MEI of March-May. The research shows that climate indices can be used to anticipate late start and variable vigor in the growing season of sensitive agricultural regions in Africa.Published by Elsevier Inc.

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“…Two indices were used. The index of the NAO was the di erence between normalized mean winter (DJF) pressure anomalies at Gibraltar and Reykjavik, Iceland (Jones et al, 1997). The period covered was 1866±1997 and the time series is shown in Fig.…”

Section: Indices Of the Nao And The So Used In This Studymentioning

confidence: 99%

Letter to the editor: Are the North Atlantic Oscillation and the Southern Oscillation related in any time-scale?

et al. 2000

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Abstract. The North Atlantic Oscillation (NAO) and the Southern Oscillation (SO) are compared from the standpoint of a possible common temporal scale of oscillation. To do this a cross-spectrum of the temporal series of NAO and SO indices was determined, ®nding a signi®cant common oscillation of 6±8 years. To assure this ®nding, both series were decomposed in their main oscillations using singular spectrum analysis (SSA). Resulting reconstructed series of 6±8 years' oscillation were then cross-correlated without and with pre-whitened, the latter being signi®cant. The main conclusion is a possible relationship between a common oscillation of 6±8 years that represents about 20% of the SO variance and about 25% of the NAO variance.

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Extension to the North Atlantic oscillation using early instrumental pressure observations from Gibraltar and south‐west Iceland

Cited by 659 publications

References 0 publications

Scale-Dependent Reconstruction of the NAO Index

Scale-Dependent Reconstruction of the NAO Index

The response of African land surface phenology to large scale climate oscillations

Letter to the editor: Are the North Atlantic Oscillation and the Southern Oscillation related in any time-scale?

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