Advected airmass reservoirs in the downwind of mountains and their roles in overrunning boundary layer depths over the plains

Sandip Pal

doi:10.1029/2019GL083988

Advected airmass reservoirs in the downwind of mountains and their roles in overrunning boundary layer depths over the plains

Sandip Pal

Geosciences

Research output: Contribution to journal › Article

Abstract

Atmospheric boundary layer depths (BLDs) over continental sites have long been meticulously characterized. However, a downwind‐footprint concept for BLDs over plains under the impact of seasonally and spatially changing horizontal advection of BLDs off elevated terrains has remained unexplored. For the first time, we provide observational evidence of the impact of mountains on regional BLDs using 25‐years (1991–2015) of rawinsonde‐retrieved afternoon BLDs over 22 sites located in the mountains' (Rockies and Appalachians) downstream. Results suggest that mountain‐advected air mass, elevated terrains, and wind play a significant role in modulating BLD variability “miles away” from terrains. We found significant BLD contrasts over the plains (400–1,500 m) under mountain‐advected versus flatland‐advected flows pertaining to elevated mixed layers off the mountain ranges. The BLD contrasts were higher in the downwind of Rockies than the Appalachians, and higher BL

Original language	English
Journal	Geophysical Research Letters
DOIs	https://doi.org/10.1029/2019GL083988
State	Published - Aug 15 2019

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Pal, S. (2019). Advected airmass reservoirs in the downwind of mountains and their roles in overrunning boundary layer depths over the plains. Geophysical Research Letters. https://doi.org/10.1029/2019GL083988

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abstract = "Atmospheric boundary layer depths (BLDs) over continental sites have long been meticulouslycharacterized. However, a downwind‐footprint concept for BLDs over plains under the impact of seasonallyand spatially changing horizontal advection of BLDs off elevated terrains has remained unexplored. For thefirst time, we provide observational evidence of the impact of mountains on regional BLDs using 25‐years(1991–2015) of rawinsonde‐retrieved afternoon BLDs over 22 sites located in the mountains' (Rockies andAppalachians) downstream. Results suggest that mountain‐advected air mass, elevated terrains, and windplay a significant role in modulating BLD variability “miles away” from terrains. We found significant BLDcontrasts over the plains (400–1,500 m) under mountain‐advected versus flatland‐advected flows pertainingto elevated mixed layers off the mountain ranges. The BLD contrasts were higher in the downwind ofRockies than the Appalachians, and higher BL",

author = "Sandip Pal",

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doi = "10.1029/2019GL083988",

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