Preliminary Analysis on the Global Features of the NCEP CFSv2 Seasonal Hindcasts
The representation of the CFSv2 ocean-atmosphere ensemble hindcasts is investigated during Dec-Jan-Feb (DJF) and Jun-Jul-Aug (JJA) from 1983 to 2010. The skill anomaly correlations showed that in some continents the forecasts do not have dependency with changes in the initial conditions. Also, in bo...
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Wiley
2014-01-01
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| Series: | Advances in Meteorology |
| Online Access: | http://dx.doi.org/10.1155/2014/695067 |
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| author | Gyrlene A. M. Silva Lívia M. M. Dutra Rosmeri P. da Rocha Tércio Ambrizzi Érico Leiva |
| author_facet | Gyrlene A. M. Silva Lívia M. M. Dutra Rosmeri P. da Rocha Tércio Ambrizzi Érico Leiva |
| author_sort | Gyrlene A. M. Silva |
| collection | DOAJ |
| description | The representation of the CFSv2 ocean-atmosphere ensemble hindcasts is investigated during Dec-Jan-Feb (DJF) and Jun-Jul-Aug (JJA) from 1983 to 2010. The skill anomaly correlations showed that in some continents the forecasts do not have dependency with changes in the initial conditions. Also, in both seasons the model has a higher skill at the 0-month lead time with the largest spatial biases occurring over the North America, South America, and Oceania. Over the continents the largest biases in the nonlinearity of El Niño minus La Niña events are found over the eastern South Africa, part of Oceania, and central-southeastern parts of South America. During DJF the main biases are related to double-ITCZ, strengthening of SPCZ, and deepening of the Aleutian and Icelandic low pressures. The simulation of a warmer SST on the eastern of most austral oceans, the strengthening (weakening) of the Subtropical (Polar) Jet over the Southern Hemisphere, and the weakening of the zonal circulation near the Antarctic continent are also found in both seasons. Over the central-eastern Equatorial Pacific a cooler bias in SST is found during JJA. These biases are interpreted by analyses of the simulated global mean-state and their impact on the main patterns of variability. |
| format | Article |
| id | doaj-art-da2978bc27bb43aab087c3f970305996 |
| institution | Kabale University |
| issn | 1687-9309 1687-9317 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Meteorology |
| spelling | doaj-art-da2978bc27bb43aab087c3f9703059962025-02-03T06:01:22ZengWileyAdvances in Meteorology1687-93091687-93172014-01-01201410.1155/2014/695067695067Preliminary Analysis on the Global Features of the NCEP CFSv2 Seasonal HindcastsGyrlene A. M. Silva0Lívia M. M. Dutra1Rosmeri P. da Rocha2Tércio Ambrizzi3Érico Leiva4Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, São Paulo, 05508-090 SP, BrazilInstitute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, São Paulo, 05508-090 SP, BrazilInstitute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, São Paulo, 05508-090 SP, BrazilInstitute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, São Paulo, 05508-090 SP, BrazilInstitute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, São Paulo, 05508-090 SP, BrazilThe representation of the CFSv2 ocean-atmosphere ensemble hindcasts is investigated during Dec-Jan-Feb (DJF) and Jun-Jul-Aug (JJA) from 1983 to 2010. The skill anomaly correlations showed that in some continents the forecasts do not have dependency with changes in the initial conditions. Also, in both seasons the model has a higher skill at the 0-month lead time with the largest spatial biases occurring over the North America, South America, and Oceania. Over the continents the largest biases in the nonlinearity of El Niño minus La Niña events are found over the eastern South Africa, part of Oceania, and central-southeastern parts of South America. During DJF the main biases are related to double-ITCZ, strengthening of SPCZ, and deepening of the Aleutian and Icelandic low pressures. The simulation of a warmer SST on the eastern of most austral oceans, the strengthening (weakening) of the Subtropical (Polar) Jet over the Southern Hemisphere, and the weakening of the zonal circulation near the Antarctic continent are also found in both seasons. Over the central-eastern Equatorial Pacific a cooler bias in SST is found during JJA. These biases are interpreted by analyses of the simulated global mean-state and their impact on the main patterns of variability.http://dx.doi.org/10.1155/2014/695067 |
| spellingShingle | Gyrlene A. M. Silva Lívia M. M. Dutra Rosmeri P. da Rocha Tércio Ambrizzi Érico Leiva Preliminary Analysis on the Global Features of the NCEP CFSv2 Seasonal Hindcasts Advances in Meteorology |
| title | Preliminary Analysis on the Global Features of the NCEP CFSv2 Seasonal Hindcasts |
| title_full | Preliminary Analysis on the Global Features of the NCEP CFSv2 Seasonal Hindcasts |
| title_fullStr | Preliminary Analysis on the Global Features of the NCEP CFSv2 Seasonal Hindcasts |
| title_full_unstemmed | Preliminary Analysis on the Global Features of the NCEP CFSv2 Seasonal Hindcasts |
| title_short | Preliminary Analysis on the Global Features of the NCEP CFSv2 Seasonal Hindcasts |
| title_sort | preliminary analysis on the global features of the ncep cfsv2 seasonal hindcasts |
| url | http://dx.doi.org/10.1155/2014/695067 |
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