Data from: High-elevation monsoon precipitation processes in the Central Andes of Peru


  • Measurements at the high-elevation Lamar Observatory in the Mantaro Valley (MV) in the Central Andes of Peru demonstrate a diurnal cycle of precipitation characterized by convective rainfall during the afternoon and nighttime stratiform rainfall with embedded convection. Data from three wet seasons 2016-2018 reveal long-duration (6-12 hours) shallow precipitating systems (LDPS) that produced about 17% of monsoon rainfall in 2016 and 2018 associated with El Niño and La Niña respectively. The LPDS fraction of monsoon rainfall doubles to 35% with weekly recurrence in 2017 under El Niño Costero (coastal) conditions. Backward trajectory analysis shows that precipitable water sustaining > 80% of seasonal precipitation and LPDS originates in the western Amazon foothills and it is transported to higher elevation in 1-2 days. LDPS occur under favorable moisture conditions dictated by the South America Low Level Jet (SALLJ) and Cold Air Incursions (CAIs). High inter-annual variability of precipitation processes occurs with increased moisture supply in the mid troposphere due to higher frequency of CAIs during the 2017 El Niño Costero, with low-level advection from the eastern Andes foothills tied to SALLJ strength and enhanced moisture convergence ahead of CAI fronts. These findings highlight the role of eastern Andes in organizing the low-level moisture supply to high-elevation precipitation systems. Analysis of ground-based vis-à-vis the Global Precipitation Measurement (GPM) mission satellite-based radar observations points to significant challenges to precipitation detection and estimation measurement from space as the GPM clutter-free height (~2 km) exceeds the depth of precipitation systems in the MV (50% overall). ... [Read More]

Total Size
23 files (1.58 GB)
Data Citation
  • Chavez, S. P., Silva, Y., & Barros, A. P. (2020). Data from: High-elevation monsoon precipitation processes in the Central Andes of Peru. Duke Research Data Repository.
  • 10.7924/r4n877f1k
Publication Date
  • ark:/87924/r4n877f1k
Is Replaced By
  • 10.7924/r41n84j94
Collection Dates
  • January 2016-March 2018
  • Steven Chavez: ORCID: 0000-0002-1591-0782
  • Data from: High-elevation monsoon precipitation processes in the Central Andes of Peru


Version DOI Comment Publication Date
2 10.7924/r41n84j94 Version 2 corrects the following in the dimension for the hour field is updated to use a 2D matrix instead of a vector; the rain matrix is transposed for the rain field. 2020-07-21
1 10.7924/r4n877f1k 2020-04-29
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