Two Centuries of Hydroclimatic Variability Reconstructed From Tree‐Ring Records Over the Amazonian Andes of Peru

Almost half of the tributaries of the Amazon River originate in the tropical Andes and support large populations in mountain regions and downstream areas. However, it is difficult to assess hydroclimatic conditions or to evaluate future scenarios due to the scarcity of long, high‐quality instrumenta...

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Veröffentlicht in:Journal of geophysical research. Atmospheres 2020-09, Vol.125 (18), p.n/a
Hauptverfasser: Humanes‐Fuente, V., Ferrero, M. E., Muñoz, A. A., González‐Reyes, Á., Requena‐Rojas, E. J., Barichivich, J., Inga, J. G., Layme‐Huaman, E. T.
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container_title Journal of geophysical research. Atmospheres
container_volume 125
creator Humanes‐Fuente, V.
Ferrero, M. E.
Muñoz, A. A.
González‐Reyes, Á.
Requena‐Rojas, E. J.
Barichivich, J.
Inga, J. G.
Layme‐Huaman, E. T.
description Almost half of the tributaries of the Amazon River originate in the tropical Andes and support large populations in mountain regions and downstream areas. However, it is difficult to assess hydroclimatic conditions or to evaluate future scenarios due to the scarcity of long, high‐quality instrumental records. Data from the Global Precipitation Climatology Project (GPCP) provide a complete record since 1979 and offer a good representation of rainfall over the tropical Andes. Longer records are needed to improve our understanding of rainfall variability and summer monsoon behavior at various scales. We developed the first annually resolved precipitation reconstruction for the tropical Andes in Peru, based on tree‐ring chronologies of Cedrela and Juglans species. The annual (November–October) reconstruction extends the short instrumental records back to 1817, explaining 68% of the total variance of precipitation over the 1979–2007 calibration period. The reconstruction reveals the well‐documented influence of El Niño‐Southern Oscillation (ENSO) on Amazon Rainfall at interannual scales (~19% of total variance) and significant multidecadal variability with alternating periods of about 40 years (~13% of rainfall variability) related to the Atlantic Multidecadal Oscillation (AMO). Both oscillatory modes can explain dry and humid periods observed within the reconstruction and are likely associated with the negative trends of rainfall in the short instrumental records and the increased drought recurrence in recent decades. Our results show that montane tropical tree rings can be used to reconstruct precipitation with exceptionally high fidelity, characterize the interannual to multidecadal variability, and identify remote forcings in the hydroclimate over the Andean Amazon Basin of Peru. Key Points Tree rings from the Andean headwaters of the Peruvian Amazon Basin allow the reconstruction of regional rainfall variability since 1817 Reconstructed rainfall reveals imprints of El Niño and the Atlantic Multidecadal Oscillation There is a recurrent alternation between wet and dry periods in the past two centuries, but an increase in droughts is evident from 1980 to present
doi_str_mv 10.1029/2020JD032565
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E. ; Muñoz, A. A. ; González‐Reyes, Á. ; Requena‐Rojas, E. J. ; Barichivich, J. ; Inga, J. G. ; Layme‐Huaman, E. T.</creator><creatorcontrib>Humanes‐Fuente, V. ; Ferrero, M. E. ; Muñoz, A. A. ; González‐Reyes, Á. ; Requena‐Rojas, E. J. ; Barichivich, J. ; Inga, J. G. ; Layme‐Huaman, E. T.</creatorcontrib><description>Almost half of the tributaries of the Amazon River originate in the tropical Andes and support large populations in mountain regions and downstream areas. However, it is difficult to assess hydroclimatic conditions or to evaluate future scenarios due to the scarcity of long, high‐quality instrumental records. Data from the Global Precipitation Climatology Project (GPCP) provide a complete record since 1979 and offer a good representation of rainfall over the tropical Andes. Longer records are needed to improve our understanding of rainfall variability and summer monsoon behavior at various scales. We developed the first annually resolved precipitation reconstruction for the tropical Andes in Peru, based on tree‐ring chronologies of Cedrela and Juglans species. The annual (November–October) reconstruction extends the short instrumental records back to 1817, explaining 68% of the total variance of precipitation over the 1979–2007 calibration period. The reconstruction reveals the well‐documented influence of El Niño‐Southern Oscillation (ENSO) on Amazon Rainfall at interannual scales (~19% of total variance) and significant multidecadal variability with alternating periods of about 40 years (~13% of rainfall variability) related to the Atlantic Multidecadal Oscillation (AMO). Both oscillatory modes can explain dry and humid periods observed within the reconstruction and are likely associated with the negative trends of rainfall in the short instrumental records and the increased drought recurrence in recent decades. Our results show that montane tropical tree rings can be used to reconstruct precipitation with exceptionally high fidelity, characterize the interannual to multidecadal variability, and identify remote forcings in the hydroclimate over the Andean Amazon Basin of Peru. Key Points Tree rings from the Andean headwaters of the Peruvian Amazon Basin allow the reconstruction of regional rainfall variability since 1817 Reconstructed rainfall reveals imprints of El Niño and the Atlantic Multidecadal Oscillation There is a recurrent alternation between wet and dry periods in the past two centuries, but an increase in droughts is evident from 1980 to present</description><identifier>ISSN: 2169-897X</identifier><identifier>EISSN: 2169-8996</identifier><identifier>DOI: 10.1029/2020JD032565</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Amazonian montane forests ; Atlantic Oscillation ; Atmospheric precipitations ; Climatology ; Drought ; Earth Sciences ; El Nino ; El Nino phenomena ; El Nino-Southern Oscillation event ; El Nino-Southern Oscillation event-rainfall relationships ; Geophysics ; Global precipitation ; Hydroclimate ; Hydrology ; Mountain regions ; Mountains ; Precipitation ; precipitation reconstruction ; Rain ; Rainfall ; Rainfall variability ; Reconstruction ; Records ; River basins ; SAMS ; Sciences of the Universe ; South America ; Southern Oscillation ; Summer monsoon ; Tree rings ; Tributaries ; tropical Andes ; Tropical climate ; Variability</subject><ispartof>Journal of geophysical research. Atmospheres, 2020-09, Vol.125 (18), p.n/a</ispartof><rights>2020. American Geophysical Union. 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Both oscillatory modes can explain dry and humid periods observed within the reconstruction and are likely associated with the negative trends of rainfall in the short instrumental records and the increased drought recurrence in recent decades. Our results show that montane tropical tree rings can be used to reconstruct precipitation with exceptionally high fidelity, characterize the interannual to multidecadal variability, and identify remote forcings in the hydroclimate over the Andean Amazon Basin of Peru. 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subjects Amazonian montane forests
Atlantic Oscillation
Atmospheric precipitations
Climatology
Drought
Earth Sciences
El Nino
El Nino phenomena
El Nino-Southern Oscillation event
El Nino-Southern Oscillation event-rainfall relationships
Geophysics
Global precipitation
Hydroclimate
Hydrology
Mountain regions
Mountains
Precipitation
precipitation reconstruction
Rain
Rainfall
Rainfall variability
Reconstruction
Records
River basins
SAMS
Sciences of the Universe
South America
Southern Oscillation
Summer monsoon
Tree rings
Tributaries
tropical Andes
Tropical climate
Variability
title Two Centuries of Hydroclimatic Variability Reconstructed From Tree‐Ring Records Over the Amazonian Andes of Peru
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