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- W3120693124 abstract "Abstract Dry intrusions (DIs) are synoptic‐scale slantwise descending airstreams from the midlatitude upper troposphere toward the boundary layer at lower latitudes. Typically occurring behind cold fronts, such intrusions of dry air often reach the boundary layer and cause its deepening, thereby affecting boundary‐layer clouds. Although subsidence is generally an inherent feature of the subtropical marine boundary layer (MBL), it is unclear how the MBL reacts to the transient, dynamically distinct DI. In this study, reanalysis data were combined with observations from the Atmospheric Radiation Measurement Eastern North Atlantic (ENA) site (39.1°N,28.0°W) to characterize the impact of DIs on MBL characteristics and clouds. Specifically, an objective criterion is applied to the observations made during the winter months of 2016–2018 to identify the DI days from those before and following DIs, and reference periods without DIs. The analyses suggest substantial deepening of the well‐mixed boundary layer accompanied by changes in the cloud, precipitation and thermodynamic properties during the DI events. During the DI, the lower troposphere cooled and dried substantially thereby inducing strong surface sensible and latent heat fluxes. All while a strong inversion builds up at the elevated MBL top affecting cloud occurrence. The results show DIs to affect the boundary layer and cloud structure at the ENA site ∼21% of the time in winter months, with the response of the cloud fields to the DI‐fronts substantially different than that to the non‐DI fronts. Hence, the DI events should be considered while studying boundary layer and cloud processes in the region." @default.
- W3120693124 created "2021-01-18" @default.
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- W3120693124 date "2021-02-17" @default.
- W3120693124 modified "2023-10-14" @default.
- W3120693124 title "The Impact of Slantwise Descending Dry Intrusions on the Marine Boundary Layer and Air‐Sea Interface Over the ARM Eastern North Atlantic Site" @default.
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- W3120693124 doi "https://doi.org/10.1029/2020jd033879" @default.
- W3120693124 hasPublicationYear "2021" @default.
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