Combining circulation weather types and daily precipitation modelling to derive climatic precipitation regions in the Pyrenees

Lemus-Cánovas, Marc; López-Bustins, Joan A.; Trapero, Laura; Martín‐Vide, Javier

doi:10.1016/j.atmosres.2019.01.018

Cited by 35 publications

(17 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the present article we applied a PCA to a matrix of a spatial character, known as the S‐mode, in which the points of the grid are variables to be reduced, and the observations are the correlation coefficients between the teleconnection indices and the precipitation series at monthly, seasonal and annual scale. This method enables a climatic regionalisation to be conducted, because it shows the degree of representativeness of each teleconnection index at monthly, seasonal and annual scale, in relation to each new component (Lopez‐Bustins et al ., 2015; Lemus‐Canovas et al ., 2019a). In order to design a regionalisation, we considered the loadings to create similar behaviour categories in the relationship between precipitation and the teleconnections.…”

Section: Database and Methodologymentioning

confidence: 99%

Precipitation in peninsular Spain: Influence of teleconnection indices and spatial regionalisation

Martinez-Artigas

Lemus-Cánovas

López-Bustins

2020

Intl Journal of Climatology

Self Cite

View full text Add to dashboard Cite

Precipitation constitutes a particularly variable climatic element in Spain. Study of teleconnection indices, closely related to precipitation, enables us to establish to a greater or lesser degree the mechanisms regulating pluviometric variability; these are vital for planning and managing water resources in semiarid regions. In the present article we attempt to identify the low-frequency patterns that present the closest statistical relationship with rainfall for each of the points on the MOPREDAS pluviometric data grid, covering the whole area of peninsular Spain. The results obtained reveal the clear dominance of Mediterranean Basin patterns, specifically of the Mediterranean Oscillation (MO) and of its version in the mid-levels of the troposphere (ULMO). Results, however, show a significant dominance of the Western Mediterranean Oscillation (WeMO) in the east of the Iberian Peninsula and the eastern part of the Cantabrian façade. Also noteworthy is the control exerted by the NAO over much of the centre and southwest of Spain, as well as the surprising dominance of an index that heretofore has not been used much, known as the Paris-London Westerly Index. Finally, we performed a regionalisation based upon the correlations between the teleconnection and precipitation indices by means of a principal components analysis, which revealed the existence of three differentiated pluviometric regions in peninsular Spain: Atlantic (centre and south), Mediterranean (east) and Cantabrian (north).

show abstract

Section: Database and Methodologymentioning

confidence: 99%

Precipitation in peninsular Spain: Influence of teleconnection indices and spatial regionalisation

Martinez-Artigas

Lemus-Cánovas

López-Bustins

2020

Intl Journal of Climatology

Self Cite

View full text Add to dashboard Cite

show abstract

“…In this sense, the authors consider that many regions are of no particular interest for the present analysis, because situations of long dry spells and extremely hot temperatures, for instance, display a practically identical synoptic behavior pattern throughout the region. For example, a subtropical ridge produces a dry environment and above-average temperatures throughout the Pyrenees (Lemus-Canovas et al, 2019a). This does not occur when spatial patterns of precipitation are investigated, because spatial variability is much greater.…”

Section: Regionalizationmentioning

confidence: 99%

“…3). This was mainly due to the fact that in these areas the number of days with precipitation (and therefore with a moderate Tx) is very high by default (Lemus-Canovas et al, 2019a). Consequently, although the spells are short, they give rise to an extremely positive thermal anomaly, mainly on the hottest days of the spell (See EM for Summer in Fig.…”

Section: Bias Correction and Evaluationmentioning

confidence: 99%

Comment on nhess-2021-5

2021

View full text Add to dashboard Cite

Impacts upon vulnerable areas such as mountain ranges may become greater under a future scenario of adverse climatic conditions. In this sense, the concurrence of long dry spells and extremely hot temperatures can induce environmental risks such as wildfires, crop yield losses or other problems, the consequences of which could be much more serious than if these events were to occur separately in time (e.g. only long dry spells). The present study attempts to address recent and future changes in the following dimensions: duration (D), magnitude (M) and extreme magnitude (EM) of compound Dry-Hot events in the Pyrenees. The analysis focuses upon changes in the extremely long dry spells and extremely high temperatures that occur within these dry periods, in order to estimate whether the internal structure of the compound event underwent a change in the observed period and whether it will change in the future (2011-2100) under intermediate (RCP4.5) and high (RCP8.5) emission scenarios. To this end, we quantified the changes in the temporal trends of such events, as well as changes in the bivariate probability density functions for the main Pyrenean regions. The results showed that to date the risk of the compound event has increased by only one dimension -magnitude (including extreme magnitude)during the last few decades. In relation to the future, increased in risk was found to be associated with an increase both in the magnitude and the duration (extremely long dry spells) of the compound event, mainly in the eastern and southern regions of the Pyrenees. IntroductionResearch on dry spells or droughts, as well as extreme heat events (i.e. heat waves) is habitually based upon an individual focus, and the compound nature of such events is often neglected. In this sense, in the case of spells (whether dry or wet), several studies have examined the duration thereof and have quantified the trends of such events in different regions of the world Zolina et al., 2013;Singh et al., 2014); however, the thermal component of these episodes has not been addressed therein. Similarly, we found different studies on temperature extremes that did not evaluate the effect of duration of such extremes (Diffenbaugh and Ashfaq 2010;Fonseca et al., 2016;Salameh et al., 2019). In general terms, the indices proposed by the Expert Team on Climate Change Detection and Indices (ETCCDI) do not involve analyzing events in a composite manner, a shortcoming that can result in underestimation of risk (Zscheischler et al., 2018).

show abstract

“…Examples of this approach are widespread in the Pyrenees area. For example, Esteban et al [16] modelled daily mean precipitation in Andorra for different circulation types; similarly, Lemus-Canovas [17] employed statistical regression techniques to perform a synoptic classification focused on SW Europe aimed at mapping the daily mean precipitation of each weather type over the whole Pyrenees. Other examples of this type of approach can be found in different parts of the Iberian Peninsula [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Extreme Precipitation Events in the Pyrenees. From the Local to the Synoptic Scale.

Lemus-Cánovas¹,

López-Bustins²,

Martín‐Vide³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Mountain systems within the Mediterranean region, e.g. the Pyrenees, are very sensitive to climate change. In the present study, we quantified the magnitude of extreme precipitation events and the number of days with torrential precipitation (daily precipitation ≥ 100 mm) in all the rain gauges available in the Pyrenees for the 1981-2015 period, analyzing the contribution of the synoptic scale in this type of events. The easternmost (under the Mediterranean influence) and north-westernmost (under Atlantic influence) areas of the Pyrenees registered the highest number of torrential events. The heaviest events are expected in the eastern part, i.e. 400 mm day-1 for a return period of 200 years. Northerly advections over the Iberian Peninsula, which present a low zonal index, i.e. im-plying a stronger meridional component, give rise to torrential events over the western Pyrenees; and easterly advections favour extreme precipitation over the eastern Pyrenees. The air mass travels a long way, from the east coast of North America, bringing heavy rainfall to the western Pyrenees. In the case of the torrential events over the eastern Pyrenees, the air mass causing the events in these areas is very short and originates in the Mediterranean Basin. The NAO index has no influence upon the occurrence of torrential events in the Pyrenees, but these events are closely related to certain Mediterranean teleconnections such as the WeMO

show abstract

Combining circulation weather types and daily precipitation modelling to derive climatic precipitation regions in the Pyrenees

Cited by 35 publications

References 44 publications

Precipitation in peninsular Spain: Influence of teleconnection indices and spatial regionalisation

Precipitation in peninsular Spain: Influence of teleconnection indices and spatial regionalisation

Comment on nhess-2021-5

Characterization of Extreme Precipitation Events in the Pyrenees. From the Local to the Synoptic Scale.

Contact Info

Product

Resources

About