Examination of the global lorenz energy cycle using MERRA and NCEP-reanalysis 2

Kim, Yeon-Hee; Kim, Maeng-Ki

doi:10.1007/s00382-012-1358-4

Cited by 35 publications

(48 citation statements)

References 14 publications

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“…For zones 3 and 4, the reduction in KZ dominated the entire La Niña event; however, the larger reduction in zone 3 was seen between August and December, whereas for zone 4, the major reduction was observed starting from December. According to Kim and Kim [23], KZ production is related to the jet streams in the troposphere and the stratosphere, where there is a maximum production located in the tropics, which corroborates the more significant results in zones 3 e 4.…”

Section: Azsupporting

confidence: 67%

An Analysis of the Energetics of Tropical and Extra-Tropical Regions under Cold ENSO Compose Episodes

Sátyro¹,

Veiga²

2017

OALib

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The purpose of this study was to quantify and evaluate the effects of ENSO (El Niño Southern Oscillation) cold phases, throughout a composite of five intense La Niña episodes, on the atmospheric energetics of four distinct domains: 80˚S -5˚N (zone 1), 50˚S -5˚N (zone 2), 30˚S -5˚N (zone 3), and 30˚S -30˚N (zone 4). Data from NCEP reanalysis-II were used in the reckoning of atmospheric energies in the mentioned areas. In the synthesis, in zones 2, 3 and 4, the results showed that production of zonal terms of potential energy and kinetic energy decreased, mainly due to decreases of the meridional temperature gradient. As a result the conversions between them and between zonal kinetic energy and eddy kinetic energy were also reduced. This behavior, however, has not led to a significant intensification of baroclinic branch, except for zone 4. Regarding zone 1, it was observed the most atypical set. That is, KZ was intensified even with the reduction of all the sources that contribute directly to its supply.

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Section: Azsupporting

confidence: 67%

An Analysis of the Energetics of Tropical and Extra-Tropical Regions under Cold ENSO Compose Episodes

Sátyro¹,

Veiga²

2017

OALib

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“…10). We also note that the gravitational power of precipitation W P has not been explicitly identified in past studies assessing the conversion rates between available potential and kinetic energies in the framework of the Lorenz energy cycle (see, e.g., Kim and Kim, 2013, and references therein).…”

Section: Revisiting the Current Understanding Of The Atmospheric Powementioning

confidence: 96%

“…while published observational estimates range from 2 to 2.5 W m −2 (Kim and Kim, 2013;Schubert and Mitchell, 2013;Huang and McElroy, 2015).…”

Section: Introductionmentioning

confidence: 99%

Quantifying the global atmospheric power budget

Makarieva

Gorshkov

Nefiodov

et al. 2016

Preprint

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Starting from the definition of mechanical work for an ideal gas, we present a novel derivation linking global wind power to measurable atmospheric parameters. The resulting expression distinguishes three components: the kinetic power associated with horizontal motion, the kinetic power associated with vertical motion and the gravitational power of precipitation. We discuss the caveats associated with integration of material derivatives in the presence of phase transitions and how these affect published analyses of global atmospheric power. Using the MERRA database for the years 2009–2015 (three hourly data on the 1.25° x 1.25° grid at 42 pressure levels) we estimate total atmospheric power at 3.1 W m−2 and kinetic power at 2.6 W m−2. The difference between the two (0.5 W m−2) is about half the independently estimated gravitational power of precipitation (1 W m−2). We explain how this discrepancy arises from the limited spatial and temporal resolution of the database. Our analysis suggests that the total atmospheric power calculated with a spatial resolution of the order of one kilometer (thus capturing the small moist convective eddies) should be around 5 W m−2. We discuss the physical constraints on global atmospheric power and how considering the dynamic effects of water vapor condensation offers new opportunities.

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“…According to Fig. 4c, it can be observed that CK intensified in all areas: by about 6.14% (zone 1), 3.78% (zone 2), 6.31% (zone 3), and 8.88% (zone 4), suggesting a strengthening of the climatological framework, that is, intensification equatorward of the positive contributions of tropospheric jets and stratospheric polar-night jets, as was suggested by Marques et al (2010), and intensification of zonal motion as a result of the poleward transport of momentum by the motion of the eddies, as suggested by Kim and Kim (2013). Analyzing the studied domains, it was noticed that the largest production of CK occurred in the first half of the interval, except in zone 1, where it was observed in December.…”

Section: Energy Conversion Termsmentioning

confidence: 83%

“…Anomalies were predominantly positive and more intense in the period of higher production. According to Kim and Kim (2013), the climatological KZ production is related to the jet streams in the troposphere and the stratosphere, where there is a maximum production between 30°N and 30°S. This suggests that the occurrence of El Niño strengthened the tropospheric and stratospheric jets, leading to a further intensification of the AZ production in the fields located in tropical latitudes (zones 3 and 4).…”

Section: Energy Generation Termsmentioning

confidence: 99%

An Analysis of the Energetics of Tropical and Extra-Tropical Regions for Warm ENSO Composite Episodes

Sátyro

Veiga

2017

Rev. bras. meteorol.

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This study focuses on the quantification and evaluation of the effects of ENSO (El Niño Southern Oscillation) warm phases, using a composite of five intense El Niño episodes between 1979 -2011 on the Energetic Lorenz Cycle for four distinct regions around the globe: 80°S -5°N (region 1), 50°S -5°N (region 2), 30°S -5°N (region 3), and 30°S -30°N(region 4), using Data from NCEP reanalysis-II. Briefly, the results showed that zonal terms of potential energy and kinetic energy were intensified, except for region 1, where zonal kinetic energy weakened. Through the analysis of the period in which higher energy production is observed, a strong communication between the available zonal potential and the zonal kinetic energy reservoirs can be identified. This communication weakened the modes linked to eddies of potential energy and kinetic energy, as well as in the other two baroclinic conversions terms. Furthermore, the results indicate that for all the regions, the system itself works to regain its stable condition. Keywords: atmospheric energetics, Lorenz Cycle, ENSO, El Niño. Uma Análise da Energética de Regiões Tropicais e Extra-Tropicais para um Composto de Episódios Quentes de ENOS ResumoEste estudo foca na quantificação e avaliação dos efeitos da fase quente de eventos ENOS (El Niño -Oscilação Sul), utilizando um composto de cinco intensos episódios de El Niño entre 1979 -2011, no Ciclo Energético Lorenz por quatro regiões distintas ao redor do globo: 80°S -5°N (domínio 1), 50°S -5°N (domínio 2), 30°S -5°N (domínio 3), e 30°S -30°N (domínio 4), utilizando os Dados do NCEP -Reanálise 2. Resumidamente, os resultados mostraram que termos zonais de energia potencial e energia cinética foram intensificadas, com exceção da região 1, onde a energia cinética zonal enfraqueceu. Através da análise do período em que é observada maior produção de energia, observa-se uma forte comunicação entre os reservatórios de energia potencial disponível zonal e energia cinética zonal. Esta comunicação enfraqueceu o modo associado à perturbação de energia potencial e cinética, bem como nos outros dois termos conversões baroclínicas. Além disso, os resultados indicam que, para todas as regiões, o sistema funciona para recuperar o seu estado estável. Palavras-chave: energética atmosférica, Ciclo de Lorenz, ENSO, El Niño.

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Examination of the global lorenz energy cycle using MERRA and NCEP-reanalysis 2

Cited by 35 publications

References 14 publications

An Analysis of the Energetics of Tropical and Extra-Tropical Regions under Cold ENSO Compose Episodes

An Analysis of the Energetics of Tropical and Extra-Tropical Regions under Cold ENSO Compose Episodes

Quantifying the global atmospheric power budget

An Analysis of the Energetics of Tropical and Extra-Tropical Regions for Warm ENSO Composite Episodes

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