Airborne Measurements of Scale-Dependent Latent Heat Flux Impacted by Water Vapor and Vertical Velocity over Heterogeneous Land Surfaces During the CHEESEHEAD19 Campaign Journal Article uri icon



  • The spatiotemporal variability of latent heat flux (LE) and water vapor; mixing ratio (rv) variability are not well understood due to the; scale-dependent and nonlinear atmospheric energy balance responses to; land surface heterogeneity. Airborne in situ and profiling Raman lidar; measurements with the wavelet technique are utilized to investigate; scale-dependent relationships among LE, vertical velocity (w) variance; (s2w), and rv variance (s2wv) over a heterogeneous surface in the; Chequamegon Heterogeneous Ecosystem Energy-balance Study Enabled by a; High-density Extensive Array of Detectors 2019 (CHEESEHEAD19) field; campaign. Our findings reveal distinct scale distributions of LE, s2w,; and s2wv at 100 m height, with a majority scale range of 120m-4km in LE,; 32m-2km in s2w, and 200 m – 8 km in s2wv. The scales are classified; into three scale ranges, the turbulent scale (8m–200m), large-eddy; scale (200m–2km), and mesoscale (2 km–8km) to evaluate scale-resolved; LE contributed by s2w and s2wv. In the large-eddy scale in Planetary; Boundary Layer (PBL), 69-75% of total LE comes from 31-51% of the; total sw and 39-59% of the total s2wv. Variations exist in LE, s2w, and; s2wv, with a range of 1.7-11.1% of total values in monthly-mean; variation, and 0.6–7.8% of total values in flight legs from July to; September. These results confirm the dominant role of the large-eddy; scale in the PBL in the vertical moisture transport from the surface to; the PBL. This analysis complements published scale-dependent LE; variations, which lack detailed scale-dependent vertical velocity and; moisture information.

publication date

  • July 7, 2023

has restriction

  • green

Date in CU Experts

  • July 19, 2023 5:23 AM

Full Author List

  • Lin G; Wang Z; Chu Y; Ziegler C; Hu X-M; Xue M; Geerts B; Paleri S; Desai AR; Yang K

author count

  • 12

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