Space‐scale resolved surface fluxes across a heterogeneous, mid‐latitude forested landscape

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Sreenath Paleri - (Author)
  • Ankur R. Desai - (Author)
  • Stefan Metzger - (Author)
  • David Durden - (Author)
  • Brian J. Butterworth - (Author)
  • Matthias Mauder - , Chair of Meteorology (Author)
  • Katrin Kohnert - (Author)
  • Andrei Serafimovich - (Author)

Abstract

The Earth's surface is heterogeneous at multiple scales owing to spatial variability in various properties. The atmospheric responses to these heterogeneities through fluxes of energy, water, carbon, and other scalars are scale-dependent and nonlinear. Although these exchanges can be measured using the eddy covariance technique, widely used tower-based measurement approaches suffer from spectral losses in lower frequencies when using typical averaging times. However, spatially resolved measurements such as airborne eddy covariance measurements can detect such larger scale (meso-β, meso-γ) transport. To evaluate the prevalence and magnitude of these flux contributions, we applied wavelet analysis to airborne flux measurements over a heterogeneous mid-latitude forested landscape, interspersed with open water bodies and wetlands. The measurements were made during the Chequamegon Heterogeneous Ecosystem Energy-balance Study Enabled by a High-density Extensive Array of Detectors intensive field campaign. We ask, how do spatial scales of surface-atmosphere fluxes vary over heterogeneous surfaces across the day and across seasons? Measured fluxes were separated into smaller-scale turbulent and larger-scale mesoscale contributions. We found significant mesoscale contributions to sensible and latent heat fluxes through summer to autumn which would not be resolved in single-point tower measurements through traditional time-domain half-hourly Reynolds decomposition. We report scale-resolved flux transitions associated with seasonal and diurnal changes of the heterogeneous study domain. This study adds to our understanding of surface-atmospheric interactions over unstructured heterogeneities and can help inform multi-scale model-data integration of weather and climate models at a sub-grid scale.

Details

Original languageEnglish
Article numbere2022JD037138
JournalJournal of Geophysical Research: Atmospheres
Volume127
Issue number23
Publication statusPublished - 22 Nov 2022
Peer-reviewedYes

External IDs

unpaywall 10.1029/2022jd037138
Scopus 85144504793
Mendeley 396418c2-515c-351d-938b-92828d6a3d95

Keywords