Page **1** of **1**

### How to calculate area of lake for model?

Posted: **November 13th, 2012, 9:40 am**

by **arl.noaa**

Hello

I want to define a lake which is going to be dried as a source. My question is how to determine the exact area of lake in HYSPLIT.

### Re: How to calculate area of lake for model?

Posted: **November 13th, 2012, 9:41 am**

by **glenn.rolph**

You define the lake area with a series of latitude longitude source positions in the CONTROL file. The number of points you use determine the spatial resolution of your simulation. For instance at 0.25 deg resolution, the CONTROL file would consist of a series of points:

38.50 -114.00 10.0 -1.0 6.0E+08

38.50 -113.75 10.0 -1.0 6.0E+08

38.50 -113.25 10.0 -1.0 6.0E+08

38.50 -113.00 10.0 -1.0 6.0E+08

38.75 -114.00 10.0 -1.0 6.0E+08

38.75 -113.75 10.0 -1.0 6.0E+08

38.75 -113.50 10.0 -1.0 6.0E+08

38.75 -113.00 10.0 -1.0 6.0E+08

39.00 -114.00 10.0 -1.0 6.0E+08

39.00 -113.75 10.0 -1.0 6.0E+08

defining the lake, and where 6E+08 represents the area of that point in m2.