Changes in precipitation extremes in Romania

Croitoru, Adina‐Eliza; Piticar, Adrian; Burada, Doina Cristina

doi:10.1016/j.quaint.2015.07.028

Cited by 124 publications

(99 citation statements)

References 67 publications

(99 reference statements)

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“…At the regional scale, large differences in extreme climate variables have been reported for different regions (Liu et al, ; Moberg et al, ; Su et al, ). In Romania, there was a significant upward trend in moderate and heavy precipitation events but a predominantly downward trend in the number of days with precipitation (Croitoru et al, ). Maximum daily precipitation showed an upward trend in southern river basins in China but a downward trend in northern river basins (Chen et al, ).…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Changes in Extreme Temperature and Precipitation Events in the Three‐Rivers Headwater Region, China

Yang

Miao

et al. 2018

JGR Atmospheres

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Extreme climate events affect sustainable development in many parts of the world. Although several studies of local extreme climate events exist, such events need more thorough investigation. Detailed studies of climatic variations that assess changes on both spatial and temporal scales are becoming increasingly necessary. In this study, 14 indices for extreme temperature and 12 indices for extreme precipitation were used to analyze the spatial distribution and temporal trends of extreme climate events in the three‐rivers headwater region (TRHR), China, over the past five decades. We found that the frequency of high temperature extremes has increased, whereas the frequency of dry extremes has decreased. Statistically significant upward trends emerged for the number of warm nights (TN90p) and the number of warm days (TX90p) in the TRHR, which increased at a rate of 11.75 and 6.79 days/10 years (p < 0.05), respectively. We also found a highly significant downward trend in the number of consecutive dry days with a rate of −4.05 days/10 years across the whole region. Overall, the TRHR has become warmer and wetter over the past 50 years and the frequency of extreme events has increased. Wavelet analysis indicated that there are significant relationships between extreme climate events in the TRHR and large‐scale ocean‐atmosphere circulation patterns, for example, the Pacific Decadal Oscillation and the El Niño–Southern Oscillation. Our findings will help local water managers and stakeholders ensure that there are effective measures in place to adapt to and mitigate the effects of potential future climate change in the TRHR.

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Section: Introductionmentioning

confidence: 99%

Spatiotemporal Changes in Extreme Temperature and Precipitation Events in the Three‐Rivers Headwater Region, China

Yang

Miao

et al. 2018

JGR Atmospheres

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“…Studies on HWs and WSs developed over the last three decades focused on their physical features or on different types of impact The 55-year period was chosen to avoid as much as possible inhomogeneities and gaps in the daily data that could be introduced by some non-climatic factors, such as changes in observational practices and timetables [53]. The recommendation of the World Meteorological Organization [54] is to maintain only those stations that have no more than 5% missing data.…”

Section: Introductionmentioning

confidence: 99%

Synoptic Conditions Generating Heat Waves and Warm Spells in Romania

et al. 2017

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Abstract:Heat waves and warm spells are extreme meteorological events that generate a significant number of casualties in temperate regions, as well as outside of temperate regions. For the purpose of this paper, heat waves and warm spells were identified based on daily maximum temperatures recorded at 27 weather stations located in Romania over a 55-year period . The intensity threshold was the 90th percentile, and the length of an event was of minimum three consecutive days. We analyzed 111 heat wave and warm spell events totaling 423 days. The classification of synoptic conditions was based on daily reanalysis at three geopotential levels and on the online version of a backward trajectories model. The main findings are that there are two major types of genetic conditions. These were identified as: (i) radiative heat waves and warm spells (type A) generated by warming the air mass due to high amounts of radiation which was found dominant in warm season; and (ii) advective heat waves and warm spells (type B) generated mainly by warm air mass advection which prevails in winter and transition seasons. These major types consist of two and three sub-types, respectively. The results could become a useful tool for weather forecasters in order to better predict the occurrence of heat waves and warm spells.

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“…The studies focused on the synoptic conditions generating the highest 24-hour precipitation amounts (Apostol, 2008;Nieto et al, 2005;Porcu et al, 2007;Croitoru et al, 2016;Pfahl, 2014) indicate a variety of causes which may be linked either to the intense cyclonic activity, either to the high atmospheric instability conditions in the lower and middle troposphere.…”

Section: Introductionmentioning

confidence: 99%

The Distribution of the Monthly 24-Hour Maximum Amount of Precipitation in Romania According to their Synoptic Causes

Dobri¹,

Sfîcă²,

Ichim³

et al. 2017

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ABSTRACT:In the present paper we have analysed the synoptic conditions generating the maximum amount of precipitation within 24 hours in Romania. This study is based on the analysis of daily weather maps from different archived sources and also on the processing of ROCADA data set concerning the daily amount of precipitation in Romania (1961Romania ( -2013. Some main weather types (WTs) -specific for the occurrence of high amount of precipitation in Romania -were established, and the daily recording of the maximum amount of precipitation for 24 hours at monthly level was assigned to one of the defined WTs. Out of the total of 312 days analysed from the synoptic point of view, a total of 133 days (42.6%) were characterized by high atmospheric instability. The larger part of them (100 days) were determined by cold air advections associated to long-wave troughs propagating from North Atlantic towards the centre of European continent, while the rest of 33 days were generated by cut-off lows identified in the middle and upper troposphere in South-East Europe. As well, 124 days (39.7%) were assigned to Mediterranean cyclones transiting the region of Romania and 55 days (17.7%) were associated with Atlantic cyclones activity. The climatology of each synoptic type is presented. Also, regional and seasonal disparities are described using proper interpolation methods.

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Changes in precipitation extremes in Romania

Cited by 124 publications

References 67 publications

Spatiotemporal Changes in Extreme Temperature and Precipitation Events in the Three‐Rivers Headwater Region, China

Spatiotemporal Changes in Extreme Temperature and Precipitation Events in the Three‐Rivers Headwater Region, China

Synoptic Conditions Generating Heat Waves and Warm Spells in Romania

The Distribution of the Monthly 24-Hour Maximum Amount of Precipitation in Romania According to their Synoptic Causes

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