Construction of a high-resolution gridded rainfall dataset for Peru from 1981 to the present day

Aybar, César; Fernández, Carlos; Huerta, Adrian; Lavado, Waldo; Vega, Fiorella; Felipe-Obando, Oscar

doi:10.1080/02626667.2019.1649411

Cited by 82 publications

(106 citation statements)

References 91 publications

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“…The gridded precipitation dataset PISCOp 2.1 is a blended product of three sources: quality‐controlled and gap‐filled station observations of precipitation, TRMM 2A25 satellite precipitation and CHIRP (Climate Hazards Group InfraRed Precipitation) gridded dataset (Aybar et al ., 2019). The generation involves a climatological correction of CHIRP on monthly scales using TRMM and station measurements.…”

Section: Datamentioning

confidence: 99%

“…In the course of the Climandes project, a cooperation project between the weather services of Switzerland and Peru (Rosas et al ., 2016), a carefully quality‐controlled and homogenized data set has been produced. Furthermore, gridded temperature and precipitation data sets have been generated by the Peruvian weather service and are available for the period since 1981 (Huerta et al ., 2018; Aybar et al ., 2019). These new data sets allow for a comprehensive analysis of the seasonal climatology and trends for both precipitation and temperature in the southern Peruvian Andes, which is presented in this study.…”

Section: Introductionmentioning

confidence: 99%

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A combined view on precipitation and temperature climatology and trends in the southern Andes of Peru

Imfeld

Sedlmeier

Gubler

et al. 2020

Intl Journal of Climatology

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In the southern Peruvian Andes, communities are highly dependent on climatic conditions due to the mainly rain-fed agriculture and the importance of glaciers and snow melt as a freshwater resource. Longer-term trends and yearto-year variability of precipitation or temperature severely affect living conditions. This study evaluates seasonal precipitation and temperature climatologies and trends in the period 1965/66-2017/18 for the southern Peruvian Andes using quality-controlled and homogenized station data and new observational gridded data. In this region, precipitation exhibits a strong annual cycle with very dry winter months and most of the precipitation falling from spring to autumn. Spatially, a northeast-southwest gradient in austral spring is observed, related to an earlier start of the rainy season in the northeastern part of the study area. Seasonal variations of maximum temperature are weak with an annual maximum in austral spring, which is related to reduced cloud cover in austral spring compared to summer. On the contrary, minimum temperatures show larger seasonal variations, possibly enhanced through changes in longwave incoming radiation following the precipitation cycle. Precipitation trends since 1965 exhibit low spatial consistency except for austral summer, when in most of the study area increasing precipitation is observed, and in austral spring, when stations in the central-western region of the study area register decreasing precipitation. All seasonal and annual trends in maximum

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Section: Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A combined view on precipitation and temperature climatology and trends in the southern Andes of Peru

Imfeld

Sedlmeier

Gubler

et al. 2020

Intl Journal of Climatology

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“…The precipitation amounts in this region show a pronounced gradient from the mountain ranges of the Cordillera Blanca with up to 1000 mm per year [20] to the coastal desert areas along the Pacific Ocean. In Huaraz, the annual precipitation sum varies between 600 and 1000 mm (based on the PISCO V2.1 dataset [31]).…”

Section: Study Areamentioning

confidence: 99%

Precipitation Characteristics at Two Locations in the Tropical Andes by Means of Vertically Pointing Micro-Rain Radar Observations

et al. 2019

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In remote areas with steep topography, such as the Tropical Andes, reliable precipitation data with a high temporal resolution are scarce. Therefore, studies focusing on the diurnal properties of precipitation are hampered. In this paper, we investigated two years of data from Micro-Rain Radars (MRR) in Cuenca, Ecuador, and Huaraz, Peru, from February 2017 to January 2019. This data allowed for a detailed study on the temporal precipitation characteristics, such as event occurrences and durations at these two locations. Our results showed that the majority of precipitation events had durations of less than 3 h. In Huaraz, precipitation has a distinct annual and diurnal cycle where precipitation in the rainy season occurred predominantly in the afternoon. These annual and diurnal cycles were less pronounced at the site in Cuenca, especially due to increased nocturnal precipitation events compared to Huaraz. Furthermore, we used a fuzzy logic classification of fall velocities and rainfall intensities to distinguish different precipitation types. This classification showed that nightly precipitation at both locations was predominantly stratiform, whereas (thermally induced) convection occurred almost exclusively during the daytime hours.

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“…The South American Summer Monsoon (SASM) controls the seasonal precipitation cycle in tropical South America, 24–27 involving the following components: the South Atlantic Convergence Zone; convection over the Amazon basin; and southward shift of the Inter‐Tropical Convergence Zone during the boreal winter/austral summer, when most of the annual precipitation occurs southward of the Amazon River 28 . The PISCO climate model 29 suggests 600–700 mm of mean annual precipitation for the period 1981–2014, both in Coropuna and in Chachani, being slightly less in Chachani, because of the increasing southward aridity trend of the Central Andes 28 . The regional climate is strongly influenced by ENSO events, related to sea surface temperature anomalies in the Pacific Ocean.…”

Section: Study Areamentioning

confidence: 99%

Current thermal state of permafrost in the southern Peruvian Andes and potential impact from El Niño–Southern Oscillation (ENSO)

Yoshikawa

Úbeda

Masías

et al. 2020

Permafrost & Periglacial

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Tropical high-mountain permafrost has a unique thermal regime due to its exposure to strong solar radiation and to rough surface snow morphology, which reduce ground heat transfer from the surface. Latent heat transfer and higher albedo that occur during the snow-covered season contribute to positive feedback that supports the presence of permafrost. This preliminary study reports on the thermal state characteristics of tropical mountain permafrost in Peru. This work also evaluates the potential combined impact of the El Niño-Southern Oscillation (ENSO) in the mountain permafrost of the Coropuna and Chachani volcanic complexes, both located at the western edge of the southern Peruvian Altiplano. Temperature monitoring boreholes were established at 5,217 m at Coropuna and 5,331 m at Chachani, and electrical resistivity was surveyed in both sites. This 7-year discontinuous record of permafrost temperature data encompasses historically extreme El Niño/La Niña events. Our results show that the current lower-altitude permafrost boundary (~5,100 m a.s.l.) is critically influenced by the balance of wet and dry seasons: permafrost tends to deplete during drought years. Typical permafrost thickness was 10-20 m and contained ice-rich pore spaces. The presence of permafrost and its thermal resistance depends on ice content and on higher albedo, usually due to: (a) hydrothermal alteration, which transforms the volcanic rocks into surfaces with ideal albedo for permafrost resilience; and (b) sublimation of the snow cover, forming ice-pinnacles named penitentes.

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Construction of a high-resolution gridded rainfall dataset for Peru from 1981 to the present day

Cited by 82 publications

References 91 publications

A combined view on precipitation and temperature climatology and trends in the southern Andes of Peru

A combined view on precipitation and temperature climatology and trends in the southern Andes of Peru

Precipitation Characteristics at Two Locations in the Tropical Andes by Means of Vertically Pointing Micro-Rain Radar Observations

Current thermal state of permafrost in the southern Peruvian Andes and potential impact from El Niño–Southern Oscillation (ENSO)

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