Temperature and precipitation regional climate series over the central Pyrenees during 1910–2013

Pérez-Zañón, Núria; Sigrò, Javier; Ashcroft, Linden

doi:10.1002/joc.4823

Cited by 26 publications

(21 citation statements)

References 41 publications

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“…A similar seasonal pattern was reported by Pérez‐Zanón et al . (2017) for the period 1970–2013. No statistically significant change in precipitation occurred during the study period (Pyrenean Observatory of Climate Change (OPCC), 2018), and its inter‐annual evolution has been found to be closely related to inter‐annual variability in the frequency of weather types (Buisan et al ., 2016).…”

Section: Discussionmentioning

confidence: 99%

Long‐term trends (1958–2017) in snow cover duration and depth in the Pyrenees

López‐Moreno¹,

Soubeyroux

Gascoin

et al. 2020

Intl Journal of Climatology

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This study investigated the temporal variability and changes in snow cover duration and the average snow depth from December to April in the Pyrenees at 1,500 and 2,100 m a.s.l. for the period 1958–2017. This is the first such analysis for the entire mountain range using SAFRAN‐Crocus simulations run for this specific purpose. The SAFRAN‐Crocus simulations were evaluated for the period 1980–2016 using 28 in situ snow depth data time series, and for the period 2000–2017 using MODIS observations of the snow cover duration. Following confirmation that the simulated snow series satisfactorily reproduced the observed evolution of the snowpack, the Mann–Kendall test showed that snow cover duration and average depth decreased during the full study period, but this was only statistically significant at 2,100 m a.s.l. The temporal evolution in the snow series indicated marked differences among massifs, elevations, and snow variables. In general, the most western massifs of the French Pyrenees underwent a greater decrease in the snowpack, while in some eastern massifs the snowpack did not decrease, and in some cases increased at 1,500 m a.s.l. The results suggest that the trends were consistent over time, as they were little affected by the start and end year of the study period, except if trends are computed only starting after 1980, when no significant trends were apparent. Most of the observed negative trends were not correlated with changes in the atmospheric circulation patterns during the snow season. This suggests that the continuous warming in the Pyrenees since the beginning of the industrial period, and particularly the sharp increase since 1955, is a major driver explaining the snow cover decline in the Pyrenees.

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Section: Discussionmentioning

confidence: 99%

Long‐term trends (1958–2017) in snow cover duration and depth in the Pyrenees

López‐Moreno¹,

Soubeyroux

Gascoin

et al. 2020

Intl Journal of Climatology

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“…Approximately two thirds of the selected stations have metadata support. Despite the exclusions, with a mean density of ~0.003 stations per km 2 sub‐IENet is more dense than for HOMER network experiments reported elsewhere (Vertačnik et al ., 2015; Osadchyi et al ., 2018 for temperature; Prohom et al ., 2016; Pérez‐Zanón et al ., 2017 for precipitation). While Gubler et al .…”

Section: Methodsmentioning

confidence: 99%

Application of homogenization methods for Ireland's monthly precipitation records: Comparison of break detection results

Coll

Domonkos

Guijarro

et al. 2020

Intl Journal of Climatology

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Time series homogenization for 299 of the available precipitation records for the island of Ireland (IENet) was performed. Four modern relative homogenization methods, that is, HOMER, ACMANT, CLIMATOL and AHOPS were applied to this network of station series where contiguous intact monthly records range from 30 to 70 years within the base period 1941–2010. Break detection results are compared between homogenization methods, and coincidences with available documentary information (metadata) were analysed. The lowest (highest) number of breaks were detected with HOMER (ACMANT). Large differences of break frequency were found, namely ACMANT and AHOPS detected 8 times as many breaks than HOMER, while the break frequency with CLIMATOL was intermediate. Also, the ratio of series classified to be homogeneous varies widely between the methods. It is 85% with HOMER, 60% with CLIMATOL, 31% with AHOPS, while only 22% with ACMANT. In a further experiment, all the available time series for Ireland and Northern Ireland, (910 series) were used with ACMANT and CLIMATOL to explore the stability of break frequency for the same 299 series examined in the base experiment. While overall break frequency slightly increased (by 6–13%), the break positions notably changed for individual time series. The number of breaks changed for 59% (23%) of the series with ACMANT (CLIMATOL). For the breaks detected coincidentally by at least three methods including ACMANT and CLIMATOL in the base experiment, the second experiment confirmed the break positions in 86–87% of the breaks. The consequences of these results in relation to the reliability of statistical homogenization are discussed. Sometimes markedly different step functions provide comparable good approaches. However, the accuracy of homogenized time series cannot be related directly to the instability of break detection results.

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“…Regarding the sub-period of 1950–1999, a decreasing trend in NHTA and PTA is observed, with a more pronounced decline in PTA (Figure 6). This sub-period was characterized by lower levels in some Pyrenean lakes (Garcés-Pastor et al, 2016; Pérez-Sanz et al, 2013), low frequency of heavy rainfall events in the pre-Pyrenees (Corella et al, 2014) and especially high temperatures with a drastic climatic variability in the Iberian Peninsula (IPCC, 2013; Pérez-Zanón et al, 2017). These contrasting conditions prompted a change in tree-growth pattern of Pyrenean forests (Agustí-Panareda et al, 2000; Andreu et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Subalpine forest dynamics reconstructed throughout the last 700 years in the Central Pyrenees by means of tree rings and pollen

et al. 2018

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Understanding how climate has modulated forest growth and composition in the past is necessary to predict the influence of the ongoing climate warming on the dynamics of mountain forests. We studied the past dynamics of subalpine Pyrenean forests during the last 700 years by assessing the relationships between sedimentary pollen and tree-ring records, and their link with climatic drivers. We compared the pollen record and the montane pollen ratio, an integrative index obtained from sedimentary pollen that allows inferring past altitudinal variations in the montane–subalpine ecotone, with tree-ring width from mountain pine ( Pinus uncinata) subalpine forests located in Central Pyrenees. To assess climate–growth associations, we related the dendrochronological data with instrumental meteorological records (1901–2010) and temperature reconstructions from the Pyrenees and Northern Hemisphere. Few robust associations were found between arboreal pollen taxa and tree-ring width series of the surrounding forests. However, significant correlations were found between the montane pollen ratio and tree-ring width series from nearby forests (located less than 10 km apart). This relationship could be potentially useful to infer long-term forest growth changes at decadal to centennial scales using the montane pollen ratio. On the contrary, our results show that tree radial growth has mainly been constrained by low temperatures although the growth sensitivity to climate has considerably varied over the last 700 years. Similar results were obtained for the last century as growth variability of these high-elevation forests is still driven by low temperatures, but a relaxation of this constrain in recent decades has been detected.

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Temperature and precipitation regional climate series over the central Pyrenees during 1910–2013

Cited by 26 publications

References 41 publications

Long‐term trends (1958–2017) in snow cover duration and depth in the Pyrenees

Long‐term trends (1958–2017) in snow cover duration and depth in the Pyrenees

Application of homogenization methods for Ireland's monthly precipitation records: Comparison of break detection results

Subalpine forest dynamics reconstructed throughout the last 700 years in the Central Pyrenees by means of tree rings and pollen

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