Physical controls on frost events in the Central Andes of Peru using in situ observations and energy flux models

Simple item page
dc.contributor.advisor
dc.contributor.authorSaavedra Huanca, Miguel
dc.contributor.authorTakahashi, Ken
dc.coverage.spatialAndes
dc.coverage.spatialPerú
dc.date.accessioned2018-08-03T15:39:02Z
dc.date.available2018-08-03T15:39:02Z
dc.date.issued2017-05-28
dc.description.abstractRadiative frosts are a major hazard to agriculture in the tropical Andes of Peru, but there are very few studies of their physical controls. In this study we focus on identifying and approximately estimating the effect that physical variables have on both the downward surface longwave flux (LW↓) and the minimum temperature (Tmin). Through a combination of case studies and statistical analysis of in situ data in the IGP Huancayo Observatory, we found that low cloud cover (CC), surface specific humidity (q), and soil moisture are key factors controlling the day-to-day variability of Tmin, which is more pronounced in the dry/cool season. We found that all frost days had q < 7 g/kg in the dry season and q < 5 g/kg in the wet season, although it should be emphasized that q covaries with CC and soil moisture. We successfully validated a numerical soil heat diffusion model with data from a field campaign in July 2010 and we used it, together with a radiative transfer model, to estimate the sensitivities of Tmin and LW↓ to atmospheric and soil variables. With these results we estimated the partial contributions of these variables to the overall day-to-day variability in Tmin and LW↓. We found that low cloud cover is the dominant factor, although specific humidity has a comparable role in the wet season. Lack of information on the cloud liquid water path is an important source of uncertainty. Enhanced soil moisture has a strong mitigating effect on frosts, although strong variability of soil moisture in the wet season could contribute substantially to the development of frosts.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationSaavedra, M., & Takahashi, K. (2017). Physical controls on frost events in the Central Andes of Peru using in situ observations and energy flux models.==$Agricultural and Forest Meteorology, 239,$==58-70. https://doi.org/10.1016/j.agrformet.2017.02.019es_ES
dc.identifier.doihttps://doi.org/10.1016/j.agrformet.2017.02.019es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalAgricultural and Forest Meteorologyes_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/2228
dc.language.isoenges_ES
dc.publisherElsevier Massones_ES
dc.relation.ispartofurn:issn:0168-1923
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_ES
dc.subjectFrostes_ES
dc.subjectAndeses_ES
dc.subjectLongwave radiationes_ES
dc.subjectRadiative transferes_ES
dc.subjectSoil thermal conductivityes_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.00es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.09es_ES
dc.titlePhysical controls on frost events in the Central Andes of Peru using in situ observations and energy flux modelses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

Files

License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Arbitrados