scholarly journals Relationship Between Atmospheric Teleconnections and the Northern Hemisphere's Circumpolar Vortex

2021 ◽  
Vol 8 (9) ◽  
Author(s):  
Nazla Bushra ◽  
Robert V. Rohli
Keyword(s):  
Circumpolar Vortex ◽  
Atmospheric Teleconnections

scholarly journals ESTUDOS DE TELECONEXÕES ATMOSFÉRICAS E POSSIBILIDADES DE AVANÇOS NA CLIMATOLOGIA GEOGRÁFICA: CONCEITOS, FONTES DE DADOS E TÉCNICAS (ATMOSPHERIC TELECONNECTIONS RESEARCH AND POSSIBILITIES OF ADVANCES IN WEATHER CONDITIONS GEOGRAPHIC: CONCEPTS, SOURCES AND TECHNIQUES)

2016 ◽  
Vol 19 ◽  
Author(s):  
Leila Limberger
Keyword(s):  
El Niño ◽  
El Nino ◽  
Weather Conditions ◽  
Atmospheric Teleconnections

RESUMO: A utilização do conceito de teleconexões atmosféricas pela Climatologia Geográfica permite análise do globo como um todo complexo. Isso porque com o conceito de teleconexões compreende-se que alterações na interação oceano-atmosfera podem se deslocar por meio de ondas planetárias e atingir outros locais do globo (por exemplo, o fenômeno El Niño - Oscilação Sul). Para estudos utilizando-se do conceito de teleconexões atmosféricas são necessários dados globais de componentes atmosféricas, que podem ser obtidos a partir de download de conjuntos de dados disponibilizados por centros de pesquisas meteorológicas. Esses dados são interpolados em grades regulares, resultados de reanálises e/ou de modelos numéricos. Há também a disponibilização de softwares gratuitos adequados para o tratamento dos dados, com a possibilidade de utilização de pacotes estatísticos específicos. Dentre as principais vantagens  da utilização de dados globais interpolados em grade espacialmente regular estão a possibilidade de espacialização dos dados em escala global, análise de padrões espaciais característicos, a longevidade e ausência de falhas nas séries temporais, o grande número de variáveis atmosféricas disponíveis (no caso dos conjuntos de reanálise) e a consistência temporal e espacial dos dados.

scholarly journals GRUN: an observation-based global gridded runoff dataset from 1902 to 2014

2019 ◽  
Vol 11 (4) ◽  
pp. 1655-1674 ◽  
Author(s):  
Gionata Ghiggi ◽  
Vincent Humphrey ◽  
Sonia I. Seneviratne ◽  
Lukas Gudmundsson
Keyword(s):  
Large Scale ◽  
Learning Algorithm ◽  
Independent Set ◽  
Large River ◽  
Antecedent Precipitation ◽  
Societal Relevance ◽  
Atmospheric Teleconnections ◽  
Runoff Variability ◽  
Monthly Runoff

Abstract. Freshwater resources are of high societal relevance, and understanding their past variability is vital to water management in the context of ongoing climate change. This study introduces a global gridded monthly reconstruction of runoff covering the period from 1902 to 2014. In situ streamflow observations are used to train a machine learning algorithm that predicts monthly runoff rates based on antecedent precipitation and temperature from an atmospheric reanalysis. The accuracy of this reconstruction is assessed with cross-validation and compared with an independent set of discharge observations for large river basins. The presented dataset agrees on average better with the streamflow observations than an ensemble of 13 state-of-the art global hydrological model runoff simulations. We estimate a global long-term mean runoff of 38 452 km3 yr−1 in agreement with previous assessments. The temporal coverage of the reconstruction offers an unprecedented view on large-scale features of runoff variability in regions with limited data coverage, making it an ideal candidate for large-scale hydro-climatic process studies, water resource assessments, and evaluating and refining existing hydrological models. The paper closes with example applications fostering the understanding of global freshwater dynamics, interannual variability, drought propagation and the response of runoff to atmospheric teleconnections. The GRUN dataset is available at https://doi.org/10.6084/m9.figshare.9228176 (Ghiggi et al., 2019).

The impact of atmospheric teleconnections on the coastal aquifers of Ria Formosa (Algarve, Portugal)

2019 ◽  
Vol 27 (8) ◽  
pp. 2775-2787
Author(s):  
Maria C. Neves ◽  
Luis Costa ◽  
Rui Hugman ◽  
José P. Monteiro
Keyword(s):  
Coastal Aquifers ◽  
Ria Formosa ◽  
Atmospheric Teleconnections ◽  
The Impact

On the Role of Atmospheric Teleconnections in Climate

2008 ◽  
Vol 21 (12) ◽  
pp. 2990-3001 ◽  
Author(s):  
Anastasios A. Tsonis ◽  
Kyle L. Swanson ◽  
Geli Wang
Keyword(s):  
Northern Hemisphere ◽  
North Atlantic ◽  
Recent Application ◽  
The North ◽  
The Pacific ◽  
Atmospheric Teleconnections ◽  
The North Atlantic ◽  
The North Atlantic Oscillation ◽  
The Tropics

Abstract In a recent application of networks to 500-hPa data, it was found that supernodes in the network correspond to major teleconnection. More specifically, in the Northern Hemisphere a set of supernodes coincides with the North Atlantic Oscillation (NAO) and another set is located in the area where the Pacific–North American (PNA) and the tropical Northern Hemisphere (TNH) patterns are found. It was subsequently suggested that the presence of atmospheric teleconnections make climate more stable and more efficient in transferring information. Here this hypothesis is tested by examining the topology of the complete network as well as of the networks without teleconnections. It is found that indeed without teleconnections the network becomes less stable and less efficient in transferring information. It was also found that the pattern chiefly responsible for this mechanism in the extratropics is the NAO. The other patterns are simply a linear response of the activity in the tropics and their role in this mechanism is inconsequential.

Do regions outside the tropical Pacific influence ENSO through atmospheric teleconnections?

2014 ◽  
Vol 45 (3-4) ◽  
pp. 583-601 ◽  
Author(s):  
H. Dayan ◽  
T. Izumo ◽  
J. Vialard ◽  
M. Lengaigne ◽  
S. Masson
Keyword(s):  
Tropical Pacific ◽  
Atmospheric Teleconnections ◽  
The Tropical Pacific
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