caa a22 4500 44579951X CHVBK 20180317145136.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s00704-010-0287-6 doi (NATIONALLICENCE)springer-10.1007/s00704-010-0287-6 Coherent structures and flux contribution over an inhomogeneously irrigated cotton field [Elektronische Daten] [Yu Zhang, Heping Liu, Thomas Foken, Quinton Williams, Matthias Mauder, Christoph Thomas] The turbulence data measured at two levels (i.e., 8.7 and 2.7m) in the Energy Balance Experiment (EBEX), which was conducted in San Joaquin Valley in California during the period from July 20 to August 24, 2000, are used to study the characteristics of coherent structures over an irrigated cotton field. Patch-to-patch irrigation in the field generated the dry-to-wet horizontal advection and the oasis effects, leading to the development of a stably internal boundary layer (SIBL) in the late mornings or the early afternoons. The SIBL persisted in the rest of the afternoons. Under this circumstance, a near-neutral atmospheric surface layer (ASL) developed during the period with a stratification transition from the unstable to stable conditions during the daytime. Therefore, EBEX provides us with unique datasets to investigate the features of coherent structures that were generated over the patches upstream and passed by our site in the unstable ASL, the near-neutral ASL, and the SIBL. We use an objective detection technique and the conditional average method that is developed based on the wavelet analysis. Our data reveal some consistencies and inconsistencies in the characteristics of coherent structures as compared with previous studies. Ramp-like structures and sweep-ejection cycles under the daytime SIBL have similar patterns to those under the nocturnal stable ASL. However, some features (i.e., intermittence) are different from those under the nocturnal stable ASL. Under the three stratifications, thermal and mechanical factors in the ASL perform differently in affecting the ramp intensity for different quantities (i.e., velocity components, temperature, and specific humidity), leading to coherent structures that modulate turbulence flow and alter turbulent transfer differently. It is also found that coherent structures contribute about 10-20% to the total fluxes in our case with different flux contributions under three stratifications and with higher transporting efficiency in sensible heat flux than latent heat and momentum fluxes. Springer-Verlag, 2010 Zhang Yu Department of Physics, Atmospheric Sciences and Geoscience, Jackson State University, 39217, Jackson, MS, USA aut Liu Heping Department of Physics, Atmospheric Sciences and Geoscience, Jackson State University, 39217, Jackson, MS, USA aut Foken Thomas Department of Micrometeorology, University of Bayreuth, Bayreuth, Germany aut Williams Quinton Department of Physics, Atmospheric Sciences and Geoscience, Jackson State University, 39217, Jackson, MS, USA aut Mauder Matthias Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Garmisch-Partenkirchen, Germany aut Thomas Christoph College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon, USA aut Theoretical and Applied Climatology Springer Vienna 103/1-2(2011-01-01), 119-131 0177-798X 103:1-2<119 2011 103 704 https://doi.org/10.1007/s00704-010-0287-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00704-010-0287-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhang Yu Department of Physics, Atmospheric Sciences and Geoscience, Jackson State University, 39217, Jackson, MS, USA aut NATIONALLICENCE 700 1- Liu Heping Department of Physics, Atmospheric Sciences and Geoscience, Jackson State University, 39217, Jackson, MS, USA aut NATIONALLICENCE 700 1- Foken Thomas Department of Micrometeorology, University of Bayreuth, Bayreuth, Germany aut NATIONALLICENCE 700 1- Williams Quinton Department of Physics, Atmospheric Sciences and Geoscience, Jackson State University, 39217, Jackson, MS, USA aut NATIONALLICENCE 700 1- Mauder Matthias Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Garmisch-Partenkirchen, Germany aut NATIONALLICENCE 700 1- Thomas Christoph College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon, USA aut NATIONALLICENCE 773 0- Theoretical and Applied Climatology Springer Vienna 103/1-2(2011-01-01), 119-131 0177-798X 103:1-2<119 2011 103 704 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer