Spatial Dependence of Stably Stratified Nocturnal Boundary-Layer Regimes in Complex Terrain

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dc.contributor.authorAbraham, Carsten
dc.contributor.authorMonahan, Adam H.
dc.date.accessioned2020-11-24T00:26:43Z
dc.date.available2020-11-24T00:26:43Z
dc.date.copyright2020en_US
dc.date.issued2020
dc.description.abstractThe stably stratified atmospheric boundary layer (SBL) has been found in previous studies to display distinct regimes of behaviour. In particular, a contrast is often drawn between the weakly (wSBL) and very (vSBL) stable boundary layers. Time series of SBL regime affiliation obtained from hidden Markov model analyses of data from three different towers at the Los Alamos National Laboratory are used to investigate the spatial dependence of SBL regime occupation and SBL transitions. The local topography influences the flow such that south-west to north-east flow prevails, for which wSBL and vSBL conditions respectively are more likely to occur. Joint probabilities of shared regime occupation at the three towers (with and without conditioning on wind direction) are much larger than would be expected from statistically independent regime sequences at the different locations. Very persistent wSBL nights (without any transitions to the vSBL) have a higher probability of occurring across the entire tower network domain than very persistent vSBL nights. Many regime transitions occur within a narrow time window between the different towers; occurrence probabilities of such events are much higher than would be expected from statistically independent regime transitions. Of such events, transitions occurring at exactly the same time across the tower network occur most often. Many co-occurring turbulence recovery events can be associated with high-intensity intermittent turbulence events. Our results imply that the scale on which the SBL regime occupation and transitions are dependent exceeds 10 km in this region of complex terrain.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipWe would like to thank the team of the Los Alamos National Laboratory (LANL) for making data from the Environmental Monitoring Plan (EMP) freely available under http://environweb.lanl.gov/weathermachine/data_request_green_weather.asp. The Japan Aerospace Exploration Agency (JAXA) is thanked for providing data of topographical elevation from the Advanced Land Observing Satellite (ALOS) Global Digital Surface Model. We would like to thank Amber Holdsworth for helpful discussions. Carsten Abraham and Adam H. Monahan are supported by the Discovery Grant Program of the Natural Sciences and Engineering Research Council Canada (NSERC).en_US
dc.identifier.citationAbraham, C., & Monahan, A. H. (2020). Spatial Dependence of Stably Stratified Nocturnal Boundary-Layer Regimes in Complex Terrain. Boundary-Layer Meteorology, 177, 19-47. https://doi.org/10.1007/s10546-020-00532-x.en_US
dc.identifier.urihttps://doi.org/10.1007/s10546-020-00532-x
dc.identifier.urihttp://hdl.handle.net/1828/12377
dc.language.isoenen_US
dc.publisherBoundary-Layer Meteorologyen_US
dc.subjectClustering
dc.subjectSpatial structure
dc.subjectSpatial variability
dc.subjectStable boundary layer
dc.subjectStatistics
dc.subject.departmentSchool of Earth and Ocean Sciences
dc.titleSpatial Dependence of Stably Stratified Nocturnal Boundary-Layer Regimes in Complex Terrainen_US
dc.typeArticleen_US

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