Contrasting air mass advection explains significant differences in boundary layer depth seasonal cycles under onshore versus offshore flows

Research output: Contribution to journalArticle

Abstract

The complexities in the atmospheric boundary layer depth (BLD) features over coastal regions<br>pose challenges for meteorological forecasts, air quality, greenhouse gas mixing and transport, and wind<br>energy production. Here, for the first time, we investigated afternoon BLD variability over 18 coastal sites in<br>the contiguous United States located along the Gulf of Mexico, Atlantic Ocean, and Pacific Ocean using<br>25 years of rawinsonde launches. Due to influence of shallow marine layer air via onshore flow, substantially<br>large BLD contrasts (ΔBLD, BLD under offshore minus onshore) were found. ΔBLDs over the sites varied<br>both seasonally and spatially among the coastal regions and within a region. For the sites along the Gulf of<br>Mexico and Atlantic Ocean, ΔBLDs were found to be higher in spring and summer (500–1,500 m) than in<br>winter and fall (100–450 m). Results underscore the importance of advection on BLD footprints and provide<br>observational constraints for mod
Original languageEnglish
JournalGeophysical Research Letters
StatePublished - Feb 22 2019

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