@article{b168466bd18c46bdbde6dfd1f2755087,
title = "Macroscopic Flow Disequilibrium Over Aeolian Dune Fields",
abstract = "Aeolian dune fields are self-organized patterns formed by wind-blown sand. Dunes are topographic roughness elements that impose drag on the atmospheric boundary layer (ABL), creating a natural coupling between form and flow. While the steady-state influence of drag on the ABL is well studied, nonequilibrium effects due to roughness transitions are less understood. Here we examine the large-scale coupling between the ABL and an entire dune field. Field observations at White Sands, New Mexico, reveal a concomitant decline in wind speed and sand flux downwind of the transition from smooth playa to rough dunes at the upwind dune-field margin, that affects the entire ∼10-km -long dune field. Using a theory for the system that accounts for the observations, we generalize to other roughness scenarios. We find that, via transitional ABL dynamics, aeolian sediment aggradation can be influenced by roughness both inside and outside dune fields.",
keywords = "aeolian, atmospheric boundary layer, dune fields, geomorphology, land-atmosphere interaction, sediment transport",
author = "A. Gunn and P. Schmutz and M. Wanker and Edmonds, {D. A.} and Ewing, {R. C.} and Jerolmack, {D. J.}",
note = "Funding Information: We are very grateful for David Bustos's continuing facilitation of research at White Sands National Monument. We thank Scott R. David and Kieran B.J. Dunne for field assistance, Elie Bou-Zeid for useful discussions, and Gary Kocurek for topography data (D.O.Is. 10.5069/G9ZK5DMD and 10.5069/G9Q23X5P). Funding provided by National Science Foundation (NSF) NRI INT Award 1734355 to D. J. J.; White Sands National Monument through NPS-GC-CESU Cooperative Agreement P12AC51051 and NSF through the National Center for Airborne Laser Mapping's EAR Award 1043051 for topography data (D.O.I. 10.5069/G97D2S2D) to R. C. E.; International Society of Aeolian Research through the Elsevier Aeolian Research Scholarship to A. G.; and UPenn Earth and Environmental Science department in support of the GEOL305 class. We thank Travis Swanson and Will Anderson for their thought-provoking and conscientious reviews. Funding Information: We are very grateful for David Bustos's continuing facilitation of research at White Sands National Monument. We thank Scott R. David and Kieran B.J. Dunne for field assistance, Elie Bou‐Zeid for useful discussions, and Gary Kocurek for topography data (D.O.Is. 10.5069/G9ZK5DMD and 10.5069/G9Q23X5P). Funding provided by National Science Foundation (NSF) NRI INT Award 1734355 to D. J. J.; White Sands National Monument through NPS‐GC‐CESU Cooperative Agreement P12AC51051 and NSF through the National Center for Airborne Laser Mapping's EAR Award 1043051 for topography data (D.O.I. 10.5069/G97D2S2D) to R. C. E.; International Society of Aeolian Research through the Elsevier Aeolian Research Scholarship to A. G.; and UPenn Earth and Environmental Science department in support of the GEOL305 class. We thank Travis Swanson and Will Anderson for their thought‐provoking and conscientious reviews. Publisher Copyright: {\textcopyright}2020. American Geophysical Union. All Rights Reserved.",
year = "2020",
month = sep,
day = "28",
doi = "10.1029/2020GL088773",
language = "English",
volume = "47",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "Wiley-Blackwell",
number = "18",
}