Seasonal rainfall variations in Spain (1912–2000) and their links to atmospheric circulation

Muñoz-Díaz, D.; Rodrigo, F. S.

doi:10.1016/j.atmosres.2005.11.005

Cited by 55 publications

(35 citation statements)

References 28 publications

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“…These three WTs have a combined frequency of occurrence of about 15%, but are responsible for up to 50% of the precipitation in winter. This confirms that a small number of WTs indeed captures a high percentage of monthly precipitation variability (Trigo and DaCamara, 2000;Paredes et al, 2006) In the Mediterranean coastland the winter precipitation is linked mostly with easterly flows, noticed by Queralt et al (2009) and Muñoz-Diaz and Rodrigo (2006).…”

Section: Discussionsupporting

confidence: 63%

“…4. Monthly precipitation during spring and autumn depends mainly from two WTs, namely W and C. We did not observe a clear distinction at IP scale previously noticed between these two seasons as suggested by Lorenzo et al (2011), Muñoz-Diaz andRodrigo (2006). 5.…”

Section: Discussionmentioning

confidence: 40%

“…Summer monthly precipitation is usually associated to Northerly or Easterly flows in the IP as suggested by in northwest areas, or by Muñoz-Diaz and Rodrigo (2006) for the whole IP. During summer months the analyses show that different WTs effects are restricted to relatively narrow areas and during short temporal intervals (one or two months), suggesting that local factors such as relief and deep convection processes could play a major role in precipitation spatial variability.…”

Section: Discussionmentioning

confidence: 99%

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Circulation weather types and spatial variability of daily precipitation in the Iberian Peninsula

2014

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The relationships between atmospheric circulation patterns and daily Iberian rainfall are here explored at high spatial resolution (0.2 • ) using the Jenkinson and Collison automated classification scheme with 26 Weather Types (WTs). The WTs were computed by means of the daily EMULATE Mean Sea Level Pressure dataset (EMSLP) while the high resolution precipitation database corresponds to the recent Iberia02 daily gridded precipitation dataset over the 1950-2003 period. Six monthly indexes relating the WTs and precipitation were analyzed: their Frequency, the Mean Precipitation, the Percentage Contribution, the Area of Influence, the Precipitation Intensity, and Efficiency. Except for the Frequency of the WTs, all other indexes were evaluated studying their spatial distribution over the Iberian Peninsula, focusing on a WT and a month at time. A small number of WTs (7) was found to capture a high percentage (∼70%) of monthly Iberian precipitation. The Westerly WT is the most influent one, followed by the Cyclonic, the Northwesterly and the Southwesterly WTs. Westerly flows, however, do not affect the Mediterranean fringe or the Cantabrian coast, which are dominated by the Easterly and Northerly WTs, respectively. Rainfall along the Mediterranean coastline and the Ebro basin depends on a variety of WTs, but their effects are confined to narrow areas and short temporal intervals, suggesting that local factors such as convective processes, orography and the proximity to a warm water body could play a major role in precipitation processes. We show that the use of daily gridded precipitation dataset holds the advantage of measuring the daily rainfall amount due to each WT directly instead to relying on the predicted values of the regression model as done in previous works.

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Section: Discussionsupporting

confidence: 63%

Section: Discussionmentioning

confidence: 40%

Section: Discussionmentioning

confidence: 99%

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Circulation weather types and spatial variability of daily precipitation in the Iberian Peninsula

2014

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“…In the case of the northern coast (Singular Type), rainfall causing floods is linked to southern flows that bring air masses from the Atlantic Ocean; the effect of the local orography over these fluxes forces an ascent of the air mass and precipitation in coastal areas (Sáenz et al, 2001). This situation may be linked to low pressure anomalies in the Mediterranean Sea (Muñoz-Díaz & Rodrigo, 2006), but the relation with the Segura River (to the southeast) must be studied in more detail. …”

Section: Classification Of the Large Catastrophic Events (Lce)mentioning

confidence: 99%

Study of historical flood events on Spanish rivers using documentary data

Barriendos

Rodrigo

2006

Hydrological Sciences Journal

142

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Series of reconstructed historical floods are valuable sources of proxy data that can be utilized for the study of flooding fluctuations in the pre-instrumental period. In this work, the severity and frequency of historical flood events in different Spanish rivers are analysed using documentary evidence. The occurrence of floods in the past is analysed bearing in mind the basic topographical and hydrological characteristics of the rivers investigated, as well as the climatological causes of their flooding during the instrumental period. Flood frequency oscillations identified in the present work coincide in general terms with already detected oscillations in previous research for shorter number of chronologies. Analysis for events covering more than two basins shows a relatively small number of cases. Meanwhile, as the climatic context produces simultaneous increases in frequency, geographical characteristics provoke a limitation on the extension of flood impacts during every severe weather event.Key words climatology; documentary data; flood frequency; floods; Spain Etude des crues historiques des rivières espagnoles à l'aide de données documentairesRésumé Les séries de crues reconstituées sont de précieuses sources de données analogues qui peuvent être utilisées pour l'étude des fluctuations de la fréquence des crues au cours de la période pré-instrumentale. Dans ce travail, la sévérité et la fréquence des crues historiques de différentes rivières espagnoles ont été étudiées sur la base de preuves documentaires. La fréquence des crues du passé a été analysée en gardant à l'esprit les principales caractéristiques topographiques et hydrologiques des rivières étudiées, de même que les causes climatologiques de leurs crues au cours de la période instrumentale. Les oscillations de la fréquence des crues identifiées dans ce travail coïncident en gros avec les oscillations détectées dans les recherches antérieures portant sur un nombre de chronologies plus restreint. Les analyses d'évènements intéressant plus de deux bassins sont relativement rares. En attendant, alors que le contexte climatique conduit à une augmentation simultanée des fréquences, les caractéristiques géographiques limitent l'extension des impacts des crues au cours de chaque épisode météorologique sévère.

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“…This kind of specialized data have been used in similar study (Rajab et al, 2013). Missing values in the available data were replaced (Suhaila et al, 2008) by mean monthly values (Muñoz-Díaz and Rodrigo, 2006). These missing data were less than 3% of the total data used in this study (del Río et al, 2011).…”

Section: Data Collectionmentioning

confidence: 99%

Estimating Trends of Mean Monthly Ozone Emission in Urbanised Areas of Malaysia

Olaniyia

Abdullaha

Ramlia

et al. 2017

Annals of Valahia University of Targoviste, Geographical Series

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A 21 year (1992 -2012) daily ozone emission data of a highly urbanised district in Malaysia was analysed with the aim of estimating the trend of ozone emission and relating this trend to the socio -economic and climatic characteristics of the area. Daily ozone emission dataset used in this study were obtained from the World Ozone and Ultraviolet Data Centre (WOUDC). The data were aggregated to obtain the mean monthly emission data. Descriptive and inferential statistical analyses were conducted to describe the datasets. Trend of the ozone emission was estimated with the use of MANN -KENDALL test. The magnitude of the trend was derived by the use of ordinary least-square fitting and the significance of trend was also tested with the use of MANN-KENDALL tool. The results of the statistical analysis indicated that the highest ozone emission occurred during the south western monsoon (May to August) period and these mean monthly ozone emission differed significantly over the study period. The trend analysis indicated a yearly decrease of between 0.069 ppt to 9.45 ppt for all the months except for the month of June when the predicted ozone concentration increased between 0.403 ppt and 0.414 ppt over 2020 to 2100. Furthermore, the results indicated that the ozone emission datasets yielded good estimates (predictive power of over 90%) with polynomial regression model. It could be concluded that the results of this study provided useful evidence for the importance of the climatic factors such as ambient air temperature, relative humidity on ozone formation. More so, this study could be useful in developing baseline information for assessing the health impact of ozone emission and for urban airshed modelling.

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Seasonal rainfall variations in Spain (1912–2000) and their links to atmospheric circulation

Cited by 55 publications

References 28 publications

Circulation weather types and spatial variability of daily precipitation in the Iberian Peninsula

Circulation weather types and spatial variability of daily precipitation in the Iberian Peninsula

Study of historical flood events on Spanish rivers using documentary data

Estimating Trends of Mean Monthly Ozone Emission in Urbanised Areas of Malaysia

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