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Trends in rainfall and temperature in the Peruvian Amazon-Andes basin over the last 40 years (1965-2007)

Publication Year


  • Lavado Casimiro, Waldo Sven
  • Labat, David
  • Ronchail, Josyane
  • Carlo Espinoza, Jhan
  • Guyot, Jean Loup
HYDROLOGICAL PROCESSES Volume: 27 Issue: 20 Pages: 2944-2957 Published: 2013
0885-6087 eISSN: 1099-1085

The hydroclimatology of the Peruvian Amazon-Andes basin (PAB) which surface corresponding to 7% of the Amazon basin is still poorly documented. We propose here an extended and original analysis of the temporal evolution of monthly rainfall, mean temperature (T-mean), maximum temperature (T-max) and minimum temperature (T-min) time series over two PABs (Huallaga and Ucayali) over the last 40years. This analysis is based on a new and more complete database that includes 77 weather stations over the 1965-2007 period, and we focus our attention on both annual and seasonal meteorological time series. A positive significant trend in mean temperature of 0.09 degrees C per decade is detected over the region with similar values in the Andes and rainforest when considering average data. However, a high percentage of stations with significant T-mean positive trends are located over the Andes region. Finally, changes in the mean values occurred earlier in T-max (during the 1970s) than in T-min (during the 1980s). In the PAB, there is neither trend nor mean change in rainfall during the 1965-2007 period. However, annual, summer and autumn rainfall in the southern Andes presents an important interannual variability that is associated with the sea surface temperature in the tropical Atlantic Ocean while there are limited relationships between rainfall and El Nino-Southern Oscillation (ENSO) events. On the contrary, the interannual temperature variability is mainly related to ENSO events. Copyright (c) 2012 John Wiley & Sons, Ltd.

Author Keyword(s)
  • Amazon basin
  • hydroclimatology
  • rainfall and temperature trend
  • climate change
  • Peru
  • ENSO
  • Atlantic SST
KeyWord(s) Plus
ESI Discipline(s)
  • Engineering
  • Environment/Ecology
Web of Science Category(ies)
  • Water Resources

[Lavado Casimiro, Waldo Sven] SENAMHI, Serv Nacl Meteorol & Hidrol, Lima 11, Peru; [Lavado Casimiro, Waldo Sven; Carlo Espinoza, Jhan] UNALM, PhD Programme Water Resources Water Resources Eng, Lima 12, Peru; [Lavado Casimiro, Waldo Sven; Labat, David] Univ Toulouse, OMP, CNRS, Geosci Environm Toulouse,IRD, F-31400 Toulouse, France; [Carlo Espinoza, Jhan] IGP, Lima, Peru; [Ronchail, Josyane] Univ Paris 07, F-75252 Paris 05, France; [Ronchail, Josyane] LOCEAN UP6 CNRS IRD MNHN, F-75252 Paris 05, France; [Guyot, Jean Loup] Univ Toulouse, OMP, CNRS, Geosci Environm Toulouse,IRD, BR-71635971 Brasilia, DF, Brazil

Reprint Adress

Casimiro, WSL (reprint author), SENAMHI, Serv Nacl Meteorol & Hidrol, Casilla 11 1308, Lima 11, Peru.

  • Brazil
  • France
  • Peru
CNRS - Adress(es)
  • Géosciences Environnement Toulouse (GET), UMR5563
  • Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), UMR7159
  • Observatoire midi-Pyrénées (OMP), UMS831
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