Journal cover Journal topic
Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 1.558
IF1.558
IF 5-year value: 1.475
IF 5-year
1.475
CiteScore value: 2.8
CiteScore
2.8
SNIP value: 0.921
SNIP0.921
IPP value: 1.56
IPP1.56
SJR value: 0.571
SJR0.571
Scimago H <br class='widget-line-break'>index value: 55
Scimago H
index
55
h5-index value: 22
h5-index22
Preprints
https://doi.org/10.5194/npg-2019-43
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/npg-2019-43
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

  18 Sep 2019

18 Sep 2019

Review status
This preprint was under review for the journal NPG but the revision was not accepted.

Temperature profiles, plumes and spectra in the surface layers of convective atmospheric boundary layers

Keith G. McNaughton1 and Subharthi Chowdhuri2 Keith G. McNaughton and Subharthi Chowdhuri
  • 1Independent Researcher, Kerikeri, New Zealand
  • 2Indian Institute of Tropical Meteorology, Pune, Maharashtra 411008, India

Abstract. We survey temperature patterns and heat transport in convective boundary layers (CBLs) from the perspective that these are emergent properties of far-from-equilibrium, complex dynamical systems. We use the term 'plumes' to denote the temperature patterns, in much the same way that the term 'eddies' is used to describe patterns of motion in turbulent flows. We introduce a two-temperature (2T) toy model to connect the scaling properties of temperature gradients, temperature variance and heat transport to the geometric properties of plumes. We then examine temperature (T) probability density functions and w-T joint probability density functions, T spectra and wT cospectra observed both within and above the surface friction layer. Here w is vertical velocity. We interpret these in terms of the properties of the plumes that give rise to them. We focus first on the self-similarity property of the plumes above the SFL, and then introduce new scaling results from within the SFL, which show that T spectra and wT cospectra are not self-similar with height at small heights z/zs < 0.1, but increasingly display properties associated with random diffusion. The CBL similarity parameters defined by McNaughton et al (Non-linear Processes in Geophysics 14, 257–271, 2007) are used throughout. We conclude by contrasting our interpretation of the role of buoyancy in CBL flows with that of Richardson (proc. Roy. Soc. London A 87, 354–373, 1920), whose ideas inform the current interpretation of the statistical fluid mechanics model of boundary-layer flows.

Keith G. McNaughton and Subharthi Chowdhuri

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Keith G. McNaughton and Subharthi Chowdhuri

Keith G. McNaughton and Subharthi Chowdhuri

Viewed

Total article views: 728 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
587 114 27 728 44 32
  • HTML: 587
  • PDF: 114
  • XML: 27
  • Total: 728
  • BibTeX: 44
  • EndNote: 32
Views and downloads (calculated since 18 Sep 2019)
Cumulative views and downloads (calculated since 18 Sep 2019)

Viewed (geographical distribution)

Total article views: 520 (including HTML, PDF, and XML) Thereof 518 with geography defined and 2 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 29 Oct 2020
Publications Copernicus
Download
Citation