Talk:Convective planetary boundary layer

Comments from RoshiniA(talk) 19:32, 31 May 2014 (UTC)

Lead section

• Can make the first sentence more clear by adding .. The(CBL), also known as the daytime....

Fixed.--Lethepku (talk) 16:24, 13 June 2014 (UTC)

• First sentence: do you mean ... by the solar heating of the earth's surface?

Fixed.--Lethepku (talk) 16:24, 13 June 2014 (UTC)

• Second sentence: This layer extends from

Fixed.--Lethepku (talk) 16:24, 13 June 2014 (UTC)

• Using two sentences would be more clear. The CBL.... three layers. From top to bottom these layers are

Rephrased.--Lethepku (talk) 16:24, 13 June 2014 (UTC)

• Better to use '...of quantities of interest' instead of '...of concerned quantities' — Preceding unsigned comment added by RoshiniA (talk • contribs) 00:49, 1 June 2014 (UTC)

Fixed.--Lethepku (talk) 16:24, 13 June 2014 (UTC)

Mean Characteristics

• First sentence is repeat of a fact/sentence from leas section. So this can be rephrased as , The mean characteristics of the three layer of the CBL are as follows.

Fixed.--Lethepku (talk) 16:25, 13 June 2014 (UTC)

• Under entertainment zone: ...quite thick, averaging about

Fixed.--Lethepku (talk) 16:25, 13 June 2014 (UTC)

• Capitalize first letter of each sentence like ... The entertainment zone

Fixed.--Lethepku (talk) 16:25, 13 June 2014 (UTC)

• Write down the fact you use the words capping inversion and entertainment zone to refer to the same layer... The entertainment zone,also called the capping inversion,

Fixed. --Lethepku (talk) 16:25, 13 June 2014 (UTC)

• Can not read clearly the labels/axis of the image. Please make the image larger.

Fixed. --Lethepku (talk) 16:25, 13 June 2014 (UTC)

Evolution

Is the word 'process' necessary in ....4-phase process growth?

I think it does not hurt to leave it there. --Lethepku (talk) 18:10, 13 June 2014 (UTC)

(2)...residual layer, so/hence the thermals penetrate rapidly upward during this phase/this second phase, allowing the top of the mixed layer to rise at rates of up to 1 km per 15 minutes

Fixed. --Lethepku (talk) 18:10, 13 June 2014 (UTC)

(3)During this third phase; which spans over/covers most of the afternoon, the mixed layer depth is relatively constant.

Fixed.--Lethepku (talk) 18:10, 13 June 2014 (UTC)

(4)Turbulence driven by buoyancy; which maintain the conservation of quantities in the mixed layer/drives the mixing, decays after sunset and results in the collapses of the CBL.

Fixed.--Lethepku (talk) 18:10, 13 June 2014 (UTC)

Please make the image larger.

Fixed.--Lethepku (talk) 18:10, 13 June 2014 (UTC)

Convection in the boundary layer

I feel like this section is a little out of place and that some paragraphs don't give a direct relation to the sub-topic.

Maybe this whole section would be best fit right after the introduction section.

The first sentence could be more appropriate to be put in the ' Mean characteristics section'.A suggestion for re-arranging of the section is given below.

The updrafts and downdrafts of boundary layer convection is the primary way in which the atmosphere moves heat, momentum, moisture, and pollutants between the Earth's surface and the upper levels of the atmosphere and turbulence play an important role in vertical transport of quantities. Thus, boundary layer convection is important in the global climate modeling, numerical weather prediction, air-quality modeling and the dynamics of numerous mesoscale phenomena.

In the CBL, buoyancy due to uneven heating from the ground surface is the major generator of turbulence. [2] Radiative cooling from the cloud tops is also an effective driver of convection. The buoyancy generated turbulence peaks in the afternoon and during most of the afternoon the boundary layer flow is in free convection; a regime where buoyancy generated turbulence dominates over shear generated turbulence.

The scale of convection ranges from a few meters to a few kilometers in the horizontal and a few hundred meters to a few kilometers in the vertical.

Response

This part is an introduction part to the model simulation, which described the simulation of turbulence. So I introduced turbulence in the CBL in this introduction part. To better represent the whole body of this part, I changed the title to "Turbulence in the CBL". --Lethepku (talk) 21:58, 12 June 2014 (UTC)

Model simulations

• ...quantities we concern ---> ...quantities of interest

Fixed.--Lethepku (talk) 17:51, 13 June 2014 (UTC)

• ...However, the randomness of turbulence and the lack of knowledge determines that parameterization of turbulent transport is needed --> Due to the randomness of turbulence and our lack of knowledge about the exact physical behavior of it, parameterization of turbulent transport is needed...

Fixed.--Lethepku (talk) 17:51, 13 June 2014 (UTC)

• Different from small eddies in the stable boundary layer, in CBL there are ---> Unlike small eddies in the stable BL, BBL has ....

Rephrased.--Lethepku (talk) 17:51, 13 June 2014 (UTC)

• The three approaches generally followed in numerical models to obtain the vertical profiles and temporal variations of quantities are, full mixing scheme, top-down and bottom up diffusion scheme and non-local scheme.

Fixed.--Lethepku (talk) 17:51, 13 June 2014 (UTC)

Top-down and bottom-up diffusion

• The symbols q,u,v and theta are not introduced before.

Deleted.--Lethepku (talk) 17:51, 13 June 2014 (UTC)

• When referring to symbols used in a equation, it's better to denote them in italic bold letters to be easily distinguished.

Fixed.--Lethepku (talk) 17:51, 13 June 2014 (UTC)

• It's unclear to me what gt is. Last sentence ... gt is the dimensionless gradient for... seems unfinished.

They did not give a physical explanation of the parameter in the paper, but only provided a vertical profile. --Lethepku (talk) 17:51, 13 June 2014 (UTC)

Finished.--Lethepku (talk) 17:51, 13 June 2014 (UTC)

• g_t and g_b are not the notations used earlier.It's better to denote all such equation symbols in italic bold letters to be easily distinguished.

Fixed.--Lethepku (talk) 17:51, 13 June 2014 (UTC)

K-theory

• Second sentence: The first-order local mixing scheme... this fact is already mentioned in the 1st sentence.

Deleted. --Lethepku (talk) 17:51, 13 June 2014 (UTC)

• ...eddy diffusion coefficient(...) and local gradients of corresponding scalars(...) :Good to denote the symbols for each quantity after introducing them.

Fixed. --Lethepku (talk) 17:51, 13 June 2014 (UTC)

• The symbols q,u,v and theta are not introduced before.

Stated in the conservation equation session.--Lethepku (talk) 17:51, 13 June 2014 (UTC)

• When referring to symbols used in a equation, it's better to denote them in italic bold letters to be easily distinguished.

Fixed.--Lethepku (talk) 17:51, 13 June 2014 (UTC)

• ...air upward by amount z towards some reference level Z during .. : It's unclear to me why the symbol Z is introduced as it is not used in any of the equations. Is it essential to use the part 'towards some reference level'?

Deleted the reference level part. --Lethepku (talk) 17:51, 13 June 2014 (UTC)

• can mention that the value of von Karman constant is empirically derived.

Fixed.--Lethepku (talk) 17:51, 13 June 2014 (UTC)

• Insert links or write down what WRF,MYNN and YSU stand for.

Deleted.--Lethepku (talk) 17:51, 13 June 2014 (UTC)

Non-Local scheme

• ...As such, this term is small in stable conditions, and is therefore, neglected in these conditions.. I would like to go without the part 'as such'

Fixed.--Lethepku (talk) 17:51, 13 June 2014 (UTC)

• When referring to symbols used in a equation, it's better to denote them in italic bold letters ( and not in inverted commas) to be easily distinguished.

Fixed.--Lethepku (talk) 17:51, 13 June 2014 (UTC)

• It would be nice to have the equation for w* as given in the reference paper.

No w*. --Lethepku (talk) 17:51, 13 June 2014 (UTC)

• rephrasing :...as evaluated in a study done in summer...using aircraft measurements.

Fixed.--Lethepku (talk) 17:51, 13 June 2014 (UTC)

• It's unclear whether the reference at the end of the paragraph apply both aircraft measurements and ground measurements.

Both observations are used to compare the two schemes.

— Preceding unsigned comment added by RoshiniA (talk • contribs) 19:45, 31 May 2014 (UTC)