Research on the Relationship of ENSO and the Frequency of Extreme Precipitation Events in China

The European Macaronesia Archipelagos (Azores, Madeira and Canary Islands) are struck frequently by extreme precipitation events. Here we present a comprehensive assessment on the relationship between atmospheric rivers and extreme precipitation events in these three Atlantic Archipelagos. The relationship between the daily precipitation from the various weather stations located in the different Macaronesia islands and the occurrence of atmospheric rivers (obtained from four different reanalyses datasets) are analysed. It is shown that the atmospheric rivers’ influence over extreme precipitation (above the 90th percentile) is higher in the Azores islands when compared to Madeira or Canary Islands. In Azores, for the most extreme precipitation days, the presence of atmospheric rivers is particularly significant (up to 50%), while for Madeira, the importance of the atmospheric rivers is reduced (between 30% and 40%). For the Canary Islands, the occurrence of atmospheric rivers on extreme precipitation is even lower.

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Relationship of Pacific SSTA to Summer Extreme Precipitation Events over Eastern China

2009 3rd International Conference on Bioinformatics and Biomedical Engineering ◽

10.1109/icbbe.2009.5163299 ◽

2009 ◽

Author(s):

Jinhu Yang

Keyword(s):

Extreme Precipitation ◽

Eastern China ◽

Extreme Precipitation Events ◽

Relationship Of ◽

Precipitation Events

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9,000 YEARS OF CALIFORNIA WEATHER: THE RELATIONSHIP BETWEEN EXTREME PRECIPITATION EVENTS AND INTERANNUAL CLIMATE CHANGE

10.1130/abs/2016am-281578 ◽

2016 ◽

Author(s):

Ingrid Hendy ◽

◽

Erik T. Brown ◽

Linda A. Hinnov ◽

Arndt Schimmelmann ◽

...

Keyword(s):

Climate Change ◽

Extreme Precipitation ◽

Extreme Precipitation Events ◽

The Relationship ◽

Precipitation Events

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Mudanças na Estrutura Termodinâmica da Atmosfera na Presença de Vórtices Ciclônicos de Altos Níveis: Um Episódio de Precipitação Extrema no Semiárido Brasileiro (Changes in the Atmospheric Thermodynamic Structure in the Presence of Upper Level...)

Revista Brasileira de Geografia Física ◽

10.26848/rbgf.v5i4.232865 ◽

2012 ◽

Vol 5 (4) ◽

pp. 877

Author(s):

Magaly De Fatima Correia ◽

Weber Andrade Gonçalves ◽

Maria Regina da Silva Aragão ◽

Maryfrance De Cassia S. Diniz

Keyword(s):

Extreme Precipitation ◽

Extreme Rainfall ◽

Thermodynamic Structure ◽

Extreme Precipitation Events ◽

Brazilian Semiarid ◽

Combined Action ◽

Upper Level ◽

The Relationship ◽

Precipitation Events

A natureza da relação entre a energia potencial convectiva (CAPE), índice de instabilidade K e altas taxas de precipitação sob a influência de vórtices ciclônicos de altos níveis (VCAN) é investigada. Dados de radiossondas realizadas em Petrolina - PE foram utilizados para diagnosticar mudanças na estrutura termodinâmica da atmosfera. Totais diários de precipitação coletados na estação meteorológica de superfície permitiram avaliar a eficiência da utilização dos índices K e CAPE na determinação do grau de instabilidade da atmosfera e previsão de chuvas extremas. A relação entre valores elevados de CAPE e registros de precipitação é evidente no período de estudo. Entretanto, a existência de valores elevados desse índice não implica necessariamente na ocorrência de chuva. As chuvas abundantes e enchentes registradas na região de Petrolina no mês de janeiro de 2004 resultaram da ação conjunta de sistemas atmosféricos de escala local e sinótica. Mecanismos dinâmicos associados com VCAN foram determinantes para liberação ou supressão da atividade convectiva. Palavras - chave: eventos extremos de precipitação, vórtices ciclônicos de altos níveis, convecção, CAPEMAX. Changes in the Atmospheric Thermodynamic Structure in the Presence of Upper Level Cyclonic Vortices: An Episode of Extreme Precipitation in the Brazilian Semiarid ABSTRACT The nature of the relationship between convective potential energy (CAPE), the instability index K and high rainfall rates under the influence of upper level cyclonic vortices is investigated. Upper air sounding data collected in Petrolina – PE, Brazil, were used to diagnose changes in the thermodynamic structure of the atmosphere. Daily precipitation totals observed at the surface meteorological station allowed evaluation of the K and CAPE efficiency in the determination of the degree of atmospheric instability and prediction of extreme rainfall. The relationship between high CAPE values and precipitation is evident in the period of study. However, high CAPE values may not lead to rainfall. The large rainfall totals and flooding registered in the Petrolina region were a result of the combined action of local and synoptic scale atmospheric systems. Dynamical mechanisms associated with VCAN played a major role in the enhancement or inhibition of convective activity.Keywords: extreme precipitation events, upper level cyclonic vortices, convection, CAPEMAX

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Global Relationship between Fronts and Warm Conveyor Belts and the Impact on Extreme Precipitation*

Journal of Climate ◽

10.1175/jcli-d-15-0171.1 ◽

2015 ◽

Vol 28 (21) ◽

pp. 8411-8429 ◽

Cited By ~ 23

Author(s):

Jennifer L. Catto ◽

Erica Madonna ◽

Hanna Joos ◽

Irina Rudeva ◽

Ian Simmonds

Keyword(s):

Southern Hemisphere ◽

Extreme Precipitation ◽

Shift Method ◽

Extreme Precipitation Events ◽

Conveyor Belts ◽

Low Levels ◽

Warm Conveyor Belts ◽

The Impact ◽

The Relationship ◽

Precipitation Events

Abstract Extratropical cyclones are responsible for many extreme precipitation events in the midlatitudes. Warm conveyor belts (WCBs) and fronts are known to be related to the uplift and hence the precipitation within cyclones. The authors have investigated the link between WCBs and fronts and how such a link impacts the occurrence of extreme precipitation events. WCB trajectories have been calculated from the ERA-Interim dataset, and low-level (below 790 hPa) and midlevel (790–600 hPa) WCBs have been considered. These have been matched with objectively identified fronts (i.e., characterized by an overlap of WCB and front somewhere along the front). About 10% of cold fronts, 8% of warm fronts (identified using a thermal criterion), and 15% of wind fronts (identified using a wind shift method) are matched with WCBs, while up to 70% of WCBs are matched with fronts. Some WCBs, especially in the Southern Hemisphere, are not matched with either type of front (up to 70% east of Australia). The relationship between WCBs and fronts does not change much between the low levels and midlevels, indicating that the WCBs are already strongly associated with fronts during the lowest part of their ascent, although in the Southern Hemisphere the WCBs are more often related to warm fronts during their midtropospheric ascent. In parts of the midlatitudes, more than 60% of extreme precipitation events match either cold or warm fronts, and up to 90% of these have matched WCBs. Fronts associated with WCBs are found to be between 2 and 10 times more likely to produce extreme precipitation events than fronts without associated WCBs.

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