Midday Boundary-Layer Collapse in the Altiplano Desert: The Combined Effect of Advection and Subsidence

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dc.catalogadorgjm
dc.contributor.authorAguirre Correa, Francisca
dc.contributor.authorDe Arellano, Jordi Vila-Guerau
dc.contributor.authorRonda, Reinder
dc.contributor.authorLobos Roco, Felipe Andrés
dc.contributor.authorSuárez Poch, Francisco Ignacio
dc.contributor.authorHartogensis, Oscar
dc.contributor.otherCEDEUS (Chile)
dc.date.accessioned2024-09-24T13:23:29Z
dc.date.available2024-09-24T13:23:29Z
dc.date.issued2023
dc.description.abstractObservations in the Altiplano region of the Atacama Desert show that the atmospheric boundary layer (ABL) suddenly collapses at noon. This rapid decrease occurs simultaneously to the entrance of a thermally driven, regional flow that causes a rise in wind speed and a marked temperature decrease. We identify the main drivers that cause the observed ABL collapse by using a land-atmosphere model. The free atmosphere lapse rate and regional forcings, such as advection of mass and cold air as well as subsidence, are first estimated by combining observations from a comprehensive field campaign and a regional model. Then, to disentangle the ABL collapse, we perform a suite of numerical experiments with increasing level of complexity: from only considering local land-atmosphere interactions, to systematically including the regional contributions of mass advection, cold air advection, and subsidence. Our results show that non-local processes related to the arrival of the regional flow are the main factors explaining the boundary-layer collapse. The advection of a shallower boundary layer (approximate to -250 m h(-1) at noon) causes an immediate decrease in the ABL height (h) at midday. This occurs simultaneously with the arrival of a cold air mass, which reaches a strength of approximate to -4 Kh(-1) at 1400 LT. These two external forcings become dominant over entrainment and surface processes that warm the atmosphere and increase h. As a consequence, the ABL growth is capped during the afternoon. Finally, a wind divergence of approximate to 8 x 10(-5) s(-1) contributes to the collapse by causing subsidence motions over the ABL from 1200 LT onward. Our findings show the relevance of treating large and small-scale processes as a continuum to be able to understand the ABL dynamics.
dc.fechaingreso.objetodigital2024-09-23
dc.fuente.origenWOS
dc.identifier.doi10.1007/s10546-023-00790-5
dc.identifier.eissn1573-1472
dc.identifier.issn0006-8314
dc.identifier.urihttps://doi.org/10.1007/s10546-023-00790-5
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/87919
dc.identifier.wosidWOS:000953255900002
dc.information.autorucEscuela de Ingeniería; Aguirre Correa, Francisca; 0000-0001-5346-4472; 245616
dc.information.autorucInstituto de Geografía; Lobos Roco, Felipe Andrés; S/I; 157192
dc.information.autorucEscuela de Ingeniería; Suárez Poch, Francisco Ignacio; 0000-0002-4394-957X; 15891
dc.language.isoen
dc.nota.accesocontenido completo
dc.pagina.final671
dc.pagina.inicio643
dc.revistaBoundary-Layer Meteorology
dc.rightsacceso abierto
dc.rights.licenseCC BY 4.0 Attribution 4.0 International Deed
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectAdvection
dc.subjectAltiplano
dc.subjectBoundary-layer collapse
dc.subjectClass
dc.subjectWRF
dc.subject.ddc550
dc.subject.deweyCiencias de la tierraes_ES
dc.subject.ods13 Climate action
dc.subject.odspa13 Acción por el clima
dc.titleMidday Boundary-Layer Collapse in the Altiplano Desert: The Combined Effect of Advection and Subsidence
dc.typeartículo
dc.volumen187
sipa.codpersvinculados245616
sipa.codpersvinculados157192
sipa.codpersvinculados15891
sipa.trazabilidadWOS;2023-07-06
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