Multi-time scale analysis of the water level minima in Lake Titicaca over the past 103 years
Rattachement africain : pe, us, gb, pl. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Lowest events in Lake Titicaca’s water level (LTWL) significantly impact local ecosystems and the drinking water supply in Peru and Bolivia. However, the hydroclimatic mechanisms driving extreme lake-level lowstands remain poorly understood. To investigate these low lake-level events, we analyzed detrended monthly LTWL anomalies, sea surface temperature (SST) datasets covering the period 1921–2023. ERA5 reanalysis covers the period 1940–2023. A multiple linear regression model was developed to compute detrended LTWL anomalies, excluding multidecadal and residual components. Interdecadal Pacific Oscillation (IPO) and Pacific Decadal Oscillation (PDO) indices were also analyzed for the same period. Results indicate that 25% of all LTWL minima events have a short duration of <5 months, while the remaining 75% of all events have a long duration of more than 9 months, respectively. All long-lived LTWL minima events are associated with reduced moisture flow from the Amazon basin toward Lake Titicaca, but the large-scale forcing varies with the phase change of the decadal component in the 11–15 years band of the PDO (PDO11–15 years). Under warm PDO11–15 years phases, LTWL minima are driven by an enhanced South American low-level jet (SALLJ) caused by warm SST anomalies over the eastern Pacific Ocean. Warm SST anomalies over tropical North Atlantic and central Pacific cold events, which reinforce the cold PDO11–15 years phases, driving long-lived LTWL minima through the reduction of SALLJ. Conversely, long-lived LTWL minima events under neutral PDO11–15 years phases are caused by westerly flow anomalies confined to the Peruvian Altiplano. Therefore, PDO and IPO do not drive long-lived LTWL minima events because their relationship does not remain consistent over time. In conclusion, long-lived LTWL minima events exhibit a regional nature and are not driven by the PDO or IPO, as LTWL shows no consistent relationship with these decadal SST modes over time.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Multi-time scale analysis of the water level minima in Lake Titicaca over the past 103 years
- Date Crossref
- 07/05/2025
- Éditeur
- Frontiers Media SA
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Instituto Geofísico del Perú pays non établi dans la noticeOrganisme public
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National University of Engineering pays non établi dans la noticeUniversité ou école supérieure
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Albany State University pays non établi dans la noticeUniversité ou école supérieure
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University at Albany Department of Atmospheric and Environmental Sciences pays non établi dans la noticeUniversité ou école supérieure
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National Centre for Earth Observation pays non établi dans la noticeStructure de recherche
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University of Reading Department of Meteorology pays non établi dans la noticeUniversité ou école supérieure
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University of Wisconsin–Madison Department of Atmospheric and Oceanic Sciences pays non établi dans la noticeUniversité ou école supérieure
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Institute of Geophysics Polish Academy of Sciences pays non établi dans la noticeStructure de recherche
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Polish Academy of Sciences pays non établi dans la noticeOrganisme public
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Universidad Nacional de Ingeniería pays non établi dans la noticeInstitution
Instituto Geofísico del Perú, National University of Engineering et Albany State University, avec 7 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.