Relationship between the summer NAO and maximum temperatures for the Iberian Peninsula

Favà, Vicent; Curto, J. J.; Llasat, M. C.

doi:10.1007/s00704-015-1547-2

Cited by 14 publications

(15 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This classification is also applicable on a larger scale-particularly over the Iberian Peninsula [21,29].…”

Section: Discussionmentioning

confidence: 99%

“…To compute each Bootstrap distribution, we carried out 1000 iterations. We divided the data into two groups of days according to the sign of the meridional component of the wind at ground level at the point (42.5 • N, 0 • E)-just over the Pyrenees [21,29]. When this component is southward (58% of the days, 'Northern days'), the northern IP is, on average, under the influence of a northern air influx linked to the NE edge of the Azores High.…”

Section: Methodsmentioning

confidence: 99%

“…We must point out that the period during which the correlation between run_N and VortSW changed sign (from the 1950s to the beginning of the 1980s) ( Figure 10) coincided with a change in the iPCN2 index (from negative to positive) ( Figure 5), a change in the SNAO index (from negative to positive [21]), a large increase in the difference between the Ebro Observatory Tx with respect to those of the Valencia Observatory ( Figure 5), a large increase in the Ebro Observatory DTR and a large fall in the Valencia Observatory DTR (Figure 11). We must point out that the period during which the correlation between run_N and VortSW changed sign (from the 1950s to the beginning of the 1980s) ( Figure 10) coincided with a change in the iPCN2 index (from negative to positive) ( Figure 5), a change in the SNAO index (from negative to positive [21]), a large increase in the difference between the Ebro Observatory Tx with respect to those of the Valencia Observatory ( Figure 5), a large increase in the Ebro Observatory DTR and a large fall in the Valencia Observatory DTR (Figure 11).…”

Section: Relationship Between the Northerly Wind At Ebro Observatory mentioning

confidence: 99%

Section: Relationship Between the Northerly Wind At Ebro Observatory mentioning

confidence: 99%

“…One way to monitor some of the changes linked to the increase in the SNAO [21,29] and iPCN2 ( Figure 5) and therefore, some of the effects of the progressive shift of the Azores High towards the north of Europe from the late 1960s onwards is by evaluating how the relationships between the northerly wind at the Ebro Observatory (run_N) and some significant variables such as the relative vorticity VortSW have changed with time. Studying how the relationship between the northerly wind and VortSW has changed over time can give us information on how the dominant direction of the northerly wind, which is related to the prevalence of certain synoptic patterns, has evolved over time in the SE of the IP and this is relevant given that, as we have seen, this direction influences decisively the Tx of this area.…”

Section: Relationship Between the Northerly Wind At Ebro Observatory mentioning

confidence: 99%

See 4 more Smart Citations

Changes in Summer Pressure Patterns across the Late 1960s and Their Influence on Temperature Trends on the Eastern Coast of the Iberian Peninsula

2018

View full text Add to dashboard Cite

Abstract:During the second half of the 20th century, in the littoral and pre-littoral areas of the Valencia region, the diurnal temperature range (DTR) registered a significant drop in summer (July and August). Meanwhile, in the same period in the lower Ebro Valley (Ebro Observatory), to the north of the Valencia region, the maximum temperature and DTR increased steeply. In order to explain the DTR drop in the coastal areas of the Valencia region, some studies have proposed an increase in the summer sea-surface temperature (SST) and others have attributed it to the urban heat island effect. Nevertheless, this drop occurred well before the current climate change was evident and therefore, before the rise of the SST. Furthermore, regarding the second proposed explanation, the drop in the DTR does not disappear when working with selected stations away from heavily urbanized areas. In this work, we propose that both the DTR rise at the Ebro Observatory and the DTR drop in the Valencia region are linked to the same process: changes in atmospheric circulation on a synoptic-scale in the North Atlantic that occurred in the late 1960s.

show abstract

“…This classification is also applicable on a larger scale-particularly over the Iberian Peninsula [21,29].…”

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Relationship Between the Northerly Wind At Ebro Observatory mentioning

confidence: 99%

Section: Relationship Between the Northerly Wind At Ebro Observatory mentioning

confidence: 99%

Section: Relationship Between the Northerly Wind At Ebro Observatory mentioning

confidence: 99%

See 3 more Smart Citations

Changes in Summer Pressure Patterns across the Late 1960s and Their Influence on Temperature Trends on the Eastern Coast of the Iberian Peninsula

2018

View full text Add to dashboard Cite

show abstract

Extreme temperature events on the Iberian Peninsula: Statistical trajectory analysis and synoptic patterns

Mohammed

Alarcón

Pino

2018

Intl Journal of Climatology

View full text Add to dashboard Cite

The occurrence of heat waves and cold spells has been receiving special attention in recent years due to their impact on human health, ecosystems and other aspects, such as the economy. The present work uses a Lagrangian approach to analyse the physical processes leading to temperature extremes in the Iberian Peninsula (IP) for the 20‐year period 1994–2013. Principal component analysis has also been carried out to identify the associated synoptic scale configurations. Spatial pattern analysis shows that the highest temperatures during hot events are reached in the SW region and the lowest ones in the NE, while a latitudinal gradient of 26 K was obtained for the cold events, with the lowest values in the NE regions and the Pyrenees. Most of the extremes persisted between 1 and 3 days for both hot and cold events. Rather than meridional advection, the primary cause behind the occurrence of hot extremes seems to be progressive diabatic warming, which becomes accentuated in its final stage and is caused, on the one hand, by air masses with long residence times over the IP and, on the other hand, by recirculation processes during summer days of weak baric gradient. The air masses producing the extreme cold events have faster trajectories and mainly originate in north and northeast Europe, due to a relative low in the central Mediterranean and a blocking high in the North Atlantic and/or in northeast Europe.

show abstract

Seasonal temperature trends on the Spanish mainland: A secular study (1916–2015)

Peña‐Angulo

González‐Hidalgo

Sandonís

et al. 2021

Intl Journal of Climatology

View full text Add to dashboard Cite

Trends in seasonal mean values of maximum and minimum temperature are analysed in the Spanish mainland from the new MOTEDAS_century database. This new data set has been developed combining the digitalized archives from the Spanish Meteorological Agency (AEMET) with information retrieved from Annual Books published by the former Meteorological Agency dating back to 1916, and covers the period 1916-2015. In all four seasons, mean seasonal temperature of maximum (Tmax) and minimum (Tmin) increased. The raising occurred in two main pulses separated by a first pause around the middle of the 20th century, but differed among seasons and also between maximum and minimum temperature. Analysis of the percentage of land affected by significant trends in maximum temperature reveals two increasing phases in spring and summer for Tmax, and in spring, summer, and autumn for Tmin. However, winter Tmax only rose during the recent decades, and autumn Tmax in the first decades. Negative significant trends were found in extended areas in spring Tmax, and in spring, autumn, and summer Tmin, confirming the first pause around the 1940's-1960's. Trends of seasonal mean values of Tmax and Tmin are not significant for at least the last 25-35 years of the study period, depending on the season. The areas under significant positive trend are usually more extended for Tmin than Tmax at any season and period. Areas with significant trend expand and contract in time according to two spatial gradients: southeast to northwest (east-west) for Tmax, and west to east for Tmin. We hypothesize a relationship between atmospheric prevalent advection and relief as triggering factors to understand spatial and temporal differences in seasonal temperatures at regional scale during the 20th century in the Iberian Peninsula.

show abstract

Relationship between the summer NAO and maximum temperatures for the Iberian Peninsula

Cited by 14 publications

References 28 publications

Changes in Summer Pressure Patterns across the Late 1960s and Their Influence on Temperature Trends on the Eastern Coast of the Iberian Peninsula

Changes in Summer Pressure Patterns across the Late 1960s and Their Influence on Temperature Trends on the Eastern Coast of the Iberian Peninsula

Extreme temperature events on the Iberian Peninsula: Statistical trajectory analysis and synoptic patterns

Seasonal temperature trends on the Spanish mainland: A secular study (1916–2015)

Contact Info

Product

Resources

About