**Research Interests**

`Research Field:``Geophysical Fluid Mechanics, Boundary Layer Meteorology on Earth and Mars``Parameterizations of physical processes in the atmospheric boundary layer based on large-eddy simulations.`

Throughout my professional career, I have performed research
in the field of the boundary-layer meteorology, especially on
large-eddy simulations and similarity theory analyses. I have
authored over 50 publications in peer-reviewed journals and several
books. I published a text-book *Structure of the Atmospheric
Boundary Layer* in 1989 (Prentice Hall). Its second edition
will be published at the end of 2010.

I developed a large-eddy simulation model (Sorbjan, 1995), and used it to study :

- diffusion in the nocturnal cloud-topped boundary layer (e.g.,
Sorbjan and Uliasz, 1999), as well as:

- free convection (e.g., Margolin, Smolarkiewicz, Sorbjan,1999;
Sorbjan, 2005),

- forced convection (e.g., Sorbjan, 2006),

- baroclinic convection (Sorbjan , 2004),

- the transitory convection (e.g., Sorbjan, 1997; 2007a)

- convection on Mars (Sorbjan, 2007b, c).

I developed parameterizations for the convective boundary layer (Sorbjan, 1996a. b; 2009a), contributed to local similarity theory (Sorbjan, 1986a, b, c), and developed the gradient-based similarity theory (Sorbjan, 2010a, b; Sorbjan and Grachev, 2010). I investigated the stable boundary layer (e.g., Sorbjan, 2006a, b; Sorbjan and Balsley, 2008). I also analyzed Mini-TES data on convection in the Martian Boundary layer (Sorbjan, Wolff, and Smith, 2009b).

**References**

Sorbjan, Z., 1986a: On similarity in the atmospheric boundary
layer. Boundary-Layer Meteorology, 34, 377-397.

Sorbjan, Z., 1986b: On vertical distribution of passive species
in the atmospheric boundary layer. Boundary-Layer Meteorology,
35, 73-81.

Sorbjan, Z., 1986c: Local similarity of spectral and cospectral
characteristics in the stable- continuous boundary layer. Boundary-Layer
Meteorology, 35, 257-275.

Sorbjan, Z., 1995: Toward evaluation of heat fluxes in the convective
boundary layer. J. Appl.Meteor., 34, 5, 1092-1098.

Sorbjan, Z., 1996a: Numerical study of penetrative and "solid-lid"
non-penetrative convective boundary layers. J. Atmos. Sci., 53,
101-112.

Sorbjan, Z., 1996b: Effects caused by varying strength of the
capping inversion based on a large-eddy simulation of the shear-free
convective boundary layer. J. Atmos. Sci., 53, 2015-2024.

Sorbjan, Z., 1997: Decay of convective turbulence revisited. Bound.-Layer
Meteor., 82, 501-515

Sorbjan Z.,and M. Uliasz, 1999: Large-Eddy Simulation of Air Pollution
Dispersion in the Nocturnal Cloud-Topped Atmospheric Boundary
Layer. Boundary-Layer Meteorology, 91, 145-157.

Margolin L. P.Smolarkiewicz and Z.Sorbjan,1999: Large-Eddy Simulations
of Convective Boundary Layers Using Nonoscillatory Differencing.
Physica D 133 (1999) 390-397.

Sorbjan Z., 2001: An evaluation of local similarity on the top
of the mixed layer based on large-eddy simulations. Boundary-Layer
Meteorology, 101, 183-207.

Sorbjan Z., 2004: Large-eddy simulations of the baroclinic boundary
layer. Boundary-Layer Meteorology, 112, 57-80.

Sorbjan Z., 2005: Statistics of scalar fields in the atmospheric
boundary layer based on large-eddy simulations. **Part I**:
Free convection. Boundary-Layer Meteorology, 116, 3, 467 - 486.

Sorbjan Z., 2006a: Statistics of scalar fields in the atmospheric
boundary layer based on large-eddy simulations. **Part II:**
Forced convection. Boundary-Layer Meteorology,119, 1, 57-79

Sorbjan Z., 2006b: Local structure of turbulence in stably-stratified
boundary layers. Journal of the Atmospheric Sciences , 63, 5,
526 1537.

Sorbjan Z., 2006c: Comments on "Flux-gradient relationship,
self-correlation and intermittency in the stable boundary layer".
(April 2006, Part B, No. 617), 132, 1371-1373)

Sorbjan Z., 2007a: Numerical study of daily transitions in the
atmospheric boundary layer. Boundary-Layer Meteorology. Boundary-Layer
Meteorology. 123, 365-383.

Sorbjan Z., 2007b: Statistics of shallow convection on **Mars**
based on large-eddy simulations. **Part 1**: Windless conditions.
Boundary-Layer Meteorology,123,1,121-142.

Sorbjan Z., 2007c: Statistics of shallow convection on **Mars**
based on large-eddy simulations. **Part 2**: Effects of wind.
Boundary-Layer Meteorology,123,1,143-157.

Sorbjan Z.and B.B.Balsley, 2008: Microstructure of turbulence
in the nocturnal boundary layer. Boundary-Layer Meteorology,129,

Sorbjan Z., 2009a, Improving non-local parameterization of the
convective boundary layer.Boundar-Layer Meteorology, 130, 57-69.

Sorbjan Z., M. Wolff, and M.D. Smith, 2009b: The thermal structure
of the boundary layer on Mars based on Mini-TES observations.
Q.J.R.Met.Soc. 135, 644, 1776 - 1787

Sorbjan Z., 2010a: Gradient-based scales and similarity laws in
the stable boundary layer. Submitted to Q.J.Roy.Met.Soc.

Sorbjan Z., 2010b: *Recent Advances in the Similarity Theory
of the Stable Boundary Layer.* Chapter in: Air Quality Modeling,
Theories, Methodologies, Computational Techniques, and Available
Databases and Software. vol. IV, Ed. P. Zannetti. The EnviroComp
Institute (in preparation).

Sorbjan Z., A.A. Grachev, 2010: An Evaluation of the Flux-Gradient
Relationship in the Stable Boundary Layer. Submitted to Bound-Layer
Meteor.

`Here are some plots generated by the LES model:`

64x64x60, dx=50, dz=30, no wind:

**Convection with shear:**

**3-D visualization:**

The LES model is described in:**Sorbjan, Z.**, 1996, Numerical study of penetrative and solid-lid non-penetrative convective boundary layers.*J. Atmos. Sci.,*53, 101-112.

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