Decadal variability in the austral summer precipitation over the Central Andes: Observations and the empirical‐statistical downscaling model
Abstract The decadal variability in summer precipitation over the Central Andes (10°–30°S) is investigated from 1921 to 2010 using low‐pass filtered time series of the central and eastern El Niño–Southern Oscillation (ENSO) Pacific (C and E) indices, the South Pacific Convergence Zone (SPCZ) index,...
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crwiley:10.1002/joc.7867 2024-06-23T07:55:17+00:00 Decadal variability in the austral summer precipitation over the Central Andes: Observations and the empirical‐statistical downscaling model Sulca, Juan Takahashi, Ken Tacza, José Espinoza, Jhan‐Carlo Dong, Bo Narodowa Agencja Wymiany Akademickiej 2022 http://dx.doi.org/10.1002/joc.7867 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.7867 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.7867 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.7867 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 42, issue 16, page 9836-9864 ISSN 0899-8418 1097-0088 journal-article 2022 crwiley https://doi.org/10.1002/joc.7867 2024-06-04T06:40:28Z Abstract The decadal variability in summer precipitation over the Central Andes (10°–30°S) is investigated from 1921 to 2010 using low‐pass filtered time series of the central and eastern El Niño–Southern Oscillation (ENSO) Pacific (C and E) indices, the South Pacific Convergence Zone (SPCZ) index, the Atlantic SST indices, Atlantic Multidecadal Oscillation (AMO) index, North Atlantic Oscillation (NAO) index, and ERA‐20C reanalysis. Additionally, an empirical‐statistical downscaling (ESD) model was built. A rotated empirical orthogonal function (REOF) analysis shows that the first leading mode of precipitation (RPC1) represents 38.2% of the total decadal variance. RPC2, RCP3, and RPC4 represent 18.8, 12.8, and 9.7% of the total decadal variance, respectively. Furthermore, RPC1 features highest loadings over most of the region. RPC2 features a dipole of highest loadings over the southernmost Bolivian Altiplano and lowest loadings over the northwestern Argentinian Andes. Conversely, RPC3 presents highest loadings over the eastern‐central Bolivian Altiplano and northwestern Argentinian Andes. RPC4 features highest loadings over the southern Bolivian Andes. RPC1 and RPC3 wet summers are associated with moisture transport from the Amazon basin, but RPC1 features the strengthening upper‐level Bolivian high‐Nordeste low system over South America. Conversely, RPC2 and RPC4 wet summers are associated with local processes induced by southward displacement of the South Atlantic Convergence Zone and warm sea surface temperature ( SST) anomalies over the Indian Ocean, respectively. According to the ESD model, the decadal variability in the central and eastern Pacific (CP and EP) and Atlantic Ocean reproduces the decadal component of the DJF precipitation over most of the Central Andes. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Wiley Online Library Austral Indian Nordeste ENVELOPE(-66.867,-66.867,-68.167,-68.167) Pacific International Journal of Climatology 42 16 9836 9864 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract The decadal variability in summer precipitation over the Central Andes (10°–30°S) is investigated from 1921 to 2010 using low‐pass filtered time series of the central and eastern El Niño–Southern Oscillation (ENSO) Pacific (C and E) indices, the South Pacific Convergence Zone (SPCZ) index, the Atlantic SST indices, Atlantic Multidecadal Oscillation (AMO) index, North Atlantic Oscillation (NAO) index, and ERA‐20C reanalysis. Additionally, an empirical‐statistical downscaling (ESD) model was built. A rotated empirical orthogonal function (REOF) analysis shows that the first leading mode of precipitation (RPC1) represents 38.2% of the total decadal variance. RPC2, RCP3, and RPC4 represent 18.8, 12.8, and 9.7% of the total decadal variance, respectively. Furthermore, RPC1 features highest loadings over most of the region. RPC2 features a dipole of highest loadings over the southernmost Bolivian Altiplano and lowest loadings over the northwestern Argentinian Andes. Conversely, RPC3 presents highest loadings over the eastern‐central Bolivian Altiplano and northwestern Argentinian Andes. RPC4 features highest loadings over the southern Bolivian Andes. RPC1 and RPC3 wet summers are associated with moisture transport from the Amazon basin, but RPC1 features the strengthening upper‐level Bolivian high‐Nordeste low system over South America. Conversely, RPC2 and RPC4 wet summers are associated with local processes induced by southward displacement of the South Atlantic Convergence Zone and warm sea surface temperature ( SST) anomalies over the Indian Ocean, respectively. According to the ESD model, the decadal variability in the central and eastern Pacific (CP and EP) and Atlantic Ocean reproduces the decadal component of the DJF precipitation over most of the Central Andes. |
author2 |
Narodowa Agencja Wymiany Akademickiej |
format |
Article in Journal/Newspaper |
author |
Sulca, Juan Takahashi, Ken Tacza, José Espinoza, Jhan‐Carlo Dong, Bo |
spellingShingle |
Sulca, Juan Takahashi, Ken Tacza, José Espinoza, Jhan‐Carlo Dong, Bo Decadal variability in the austral summer precipitation over the Central Andes: Observations and the empirical‐statistical downscaling model |
author_facet |
Sulca, Juan Takahashi, Ken Tacza, José Espinoza, Jhan‐Carlo Dong, Bo |
author_sort |
Sulca, Juan |
title |
Decadal variability in the austral summer precipitation over the Central Andes: Observations and the empirical‐statistical downscaling model |
title_short |
Decadal variability in the austral summer precipitation over the Central Andes: Observations and the empirical‐statistical downscaling model |
title_full |
Decadal variability in the austral summer precipitation over the Central Andes: Observations and the empirical‐statistical downscaling model |
title_fullStr |
Decadal variability in the austral summer precipitation over the Central Andes: Observations and the empirical‐statistical downscaling model |
title_full_unstemmed |
Decadal variability in the austral summer precipitation over the Central Andes: Observations and the empirical‐statistical downscaling model |
title_sort |
decadal variability in the austral summer precipitation over the central andes: observations and the empirical‐statistical downscaling model |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dx.doi.org/10.1002/joc.7867 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.7867 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.7867 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.7867 |
long_lat |
ENVELOPE(-66.867,-66.867,-68.167,-68.167) |
geographic |
Austral Indian Nordeste Pacific |
geographic_facet |
Austral Indian Nordeste Pacific |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
International Journal of Climatology volume 42, issue 16, page 9836-9864 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.7867 |
container_title |
International Journal of Climatology |
container_volume |
42 |
container_issue |
16 |
container_start_page |
9836 |
op_container_end_page |
9864 |
_version_ |
1802647799003611136 |