University of Manchester

Faculty of Life Sciences

PhotoGraphics Unit

The blue instruction columns are for your help

designing and will not print out on your poster

This PowerPoint 2007 and 2010 poster template produces a

landscape style poster. This view is as a three column-wide centre

poster (although this can be altered – see Modifying instructions

below) and includes the University Logo, Faculty Name and Faculty

web address. This template can be printed to any of the

International Standard Paper sizes (A0,A1,…etc)

The template should help design a well laid out scientific poster

and will hopefully save you time by not having to start from scratch.

The template has all the elements you need to create your poster,

and by simply dragging and dropping the individual poster

elements you can quickly and simply get a well laid out poster.

If you have any questions regarding the templates, or if you want to

get your poster printed by us please contact :

PhotoGraphics Unit on Tel: 0161 275 5258 or

Email: photographics.lifesciences@manchester.ac.uk

Modifying the Poster Layout

This PowerPoint 2007-10 template has three different column

layouts. To change to one of the different layouts, Right-click your

mouse on the background (not on the columns or title bar) and click

on “Layout” to see the different layout options.

The columns in the provided layouts are fixed and cannot be moved but advanced users can modify

any layout by going to VIEW and then SLIDE MASTER.

Using the placeholders

To add text to this template click inside a placeholder and type in or

paste your text. To move a placeholder, click on it once (to select

it), place your cursor on its frame and your cursor will change to the

symbol of your ‘mouse pointer on a cross’.

You can then, click once and drag it to its new location where you

can resize it as needed.

Additional placeholders for Titles, Text and Images can be found on

the right hand instruction column of this template.

Viewing your poster

To get an idea as to how you poster will look, you can view the

template at the size it will look like when printed. To see what you

poster will look like at A0 view the template at 100%. To view your

poster at A1 view the template at 70% (to zoom in and out go to the

VIEW menu and click on ZOOM to set your preferred

magnification).

Removing Template Elements

To remove any of the Sub-Title Bars and text boxes that are

already on the template and that you don’t need, just select them

with the mouse and press the delete key.

Importing Text and Graphics from External

Sources

Text: Paste or type your text into a pre-existing placeholder or drag

in a new placeholder from the left side of the template. Move it

anywhere as needed.

Photos/Images: Drag in a picture placeholder, size it first, click in it

and insert a photo from the menu.

Tables: You can copy and paste a table from an external document

onto this poster template. To adjust the way the text fits within the

cells of a table that has been pasted, right-click on the table, click

FORMAT SHAPE then click on TEXT BOX and change the

INTERNAL MARGIN values to 0.25

Graphs: You should save graphs as image files such as jpeg, in

the programme that you created them in e.g. excel, and then insert

them into the poster using the Photo/Images instruction above. (Don’t copy and paste you graph from the programme e.g. Excel directly into the template as the

graph may not print properly)

Poster Elements

Use the sections provided below to add new elements to your

poster: Drag a placeholder onto the poster area, size it, and click in

it to edit.

Sub-Heading placeholder

Move this sub-heading placeholder onto the poster to add another

sub-heading. Use section headers to separate the sections and

topics on your poster.

Text placeholder

Move this preformatted text placeholder to the poster to add a new

body of text.

Picture placeholder

Move this graphic placeholder onto your poster, size it first, and

then click it to add a picture to the poster.

PhotoGraphics Unit – University of Manchester

1.828 Stopford Building, Oxford Road, Manchester, M13 9PT

Tel: 0161 275 5258

Email: photographics.lifesciences@manchester.ac.uk

Exploring the impact of ice phase microphysical processes on

mesoscale structures in mid-latitude cyclones using WRF C. Dearden1, T. Tsai2, J-P. Chen2, G. Vaughan1, P. Connolly1 and T. Choularton1

Download a PDF of this poster here:

Motivation • The latest microphysics observations of mid-latitude cyclones indicate the

prevalence of secondary ice columns produced via the Hallett-Mossop process, and significant variations in ice crystal habit (see poster #65).

• Local rates of diabatic heating and cooling associated with deposition growth

and sublimation, as calculated from the in-situ measurements, show sensitivity to variations in the observed crystal habit (Dearden et al 2014,

MWR; poster #213). Yet historically bulk microphysics schemes assume either spherical ice or a fixed mass-size relationship.

• Thus there is a need to explore the impact of habit evolution on meoscale

structures in extratropical storms. We aim to do this using a new bulk microphysics scheme with an adaptive habit parameterization,

implemented within the Weather Research and Forecasting model (WRF).

Contact details: christopher.dearden@manchester.ac.uk

1 School of Earth, Atmospheric and Environmental Sciences, University of Manchester; 2 Department of Atmospheric Sciences, National Taiwan University

Case study details and initial WRF simulations

Case studies are taken from the DIAMET field campaign (DIAbatic influences on Mesoscale structures in ExtraTropial storms) which took place in the UK between

September 2011 and August 2012.

Case study #1: 29th November 2011. Narrow cold frontal rainband associated with the passage

of a kata cold front over the UK

Simulations of this case were performed with a beta version of the TC scheme implemented into WRFv3.4.1, with 3 domains as illustrated below (50 vertical levels). 18 hour simulations were initialised at 00 UTC 29th November 2011 using ECMWF analysis data at 0.25deg resolution, with boundary conditions updated every 6 hours.

Bulk parameterization of adaptive growth (inherent growth ratio varies as a function of temperature, based on the method of Chen and Lamb, 1994);

Ice crystal shape is influenced by deposition and riming processes; Aggregation of pristine ice is modified from a simple collection kernel of Cotton

et al. (1986). Removes the need for an arbitrary threshold size for autoconversion, and also permits pristine ice to grow to larger sizes (~1mm) as seen in the observations;

The effect of pristine ice shape (plates or columns) on the fall speed is included based on Mitchell and Heymsfield (2005). NB - The effects of shape on the ventilation of pristine ice is not yet included.

Introducing the Tsai and Chen bulk microphysics scheme

30km

6km

2km

The initial sensitivity experiments explore the impact of the adaptive habit parameterization (‘Shape-3M’) on the intensity and distribution of surface precipitation, relative to the more simple assumption of spherical cloud ice crystals (‘Sphere-2M’)

Preliminary findings and future work

Initial results suggest that the subtleties of ice phase microphysical processes in wintertime kata cold frontal rainbands are overshadowed by the strong dynamical forcing of such systems (further work is required to confirm this)

The role of diabatic heating and cooling may be more significant in other cases, e.g. in summer when the baroclinicity is generally weaker and there is more condensible water vapour available due to the Clausius-Clapeyron relationship. E.g. case study #2: 18th July 2012 (bent-back front over Scotland, bringing flooding to the Edinburgh/Fife area).

National Taiwan University

Nice

(#/L)

Qice

(g/kg)

MVD

(um) Aspect

ratio

LH_RIM

(K/hr)

LH_DEP

(K/hr)

Vertical cross-sections (averaged from 50.5N - 51.5N, inner domain) at 1530 UTC, with 3-M ice