We intend to estimate advection by taking the differences between data from the upwind sonic array and data from the downwind, bottom array. Therefore I have calculated the height difference between the sonic measurement volume and the nominal sonic heights measured at the base of the boom. The nominal heights were closely matched between the upwind and downwind arrays. I calculated the height difference as
sonic height above height measured at base of boom = boom-length*sin(pitch-angle) = boom-length*sin(lean*cos(leanaz))
where lean and leanaz were determined with the planar fit technique and recorded in the sonic cal files. The boom-length is the distance from the base of the boom to the sonic measurement volume = 1.765 cm.
In the following tables, a positive height difference indicates that the sonic is higher than the base of the boom. The height differences are in cm. The Date/time in the first column is when the new height difference takes effect.
Upwind array
Date/time (PDT) |
Config |
boom ht |
3u |
4u |
5u |
6u |
7u |
8u |
9u |
10u |
11u |
mean |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
June 25 00:00 |
1 |
3.74 m |
1.7 |
-0.5 |
-2.4 |
-2.3 |
3.0 |
0.6 |
0.9 |
-1.0 |
-0.6 |
-0.1 |
July 1 13:00* |
1 |
3.24 |
1.0 |
-0.8 |
-3.3 |
-3.4 |
2.2 |
0.5 |
0.3 |
-2.1 |
-0.8 |
-0.7 |
July 20 16:00 |
2 |
3.64 |
0.4 |
6.1 |
0.4 |
3.0 |
4.0 |
3.1 |
1.5 |
0.2 |
-0.2 |
2.1 |
July 29 12:30 |
3 |
4.83 |
0.9 |
1.6 |
-3.3 |
1.5 |
1.8 |
1.2 |
2.5 |
2.2 |
0.2 |
1.0 |
Aug 9 18:00 |
4 |
6.98 |
6.1 |
7.7 |
7.3 |
4.1 |
4.1 |
7.7 |
2.8 |
4.6 |
1.1 |
5.0 |
* changed upwind array height from 3.74m to 3.24m
Bottom, downwind array
Date/time (PDT) |
Config |
boom ht |
1b |
2b |
3b |
4b |
5b |
6b |
7b |
8b |
9b |
10b |
11b |
12b |
13b |
mean |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
June 25 00:00 |
1 |
3.24 m |
1.4 |
-0.2 |
-1.4 |
0.4 |
0.2 |
-2.7 |
-0.6 |
-4.0 |
2.4 |
1.0 |
-1.5 |
-1.3 |
0.9 |
-0.4 |
July 20 16:00 |
2 |
3.64 |
-1.8 |
-7.7 |
-11.4 |
-7.2 |
-4.8 |
2.2 |
-2.5 |
-7.9 |
-9.6 |
-10.7 |
-7.6 |
-1.3 |
-2.7 |
-5.6 |
July 29 12:30 |
3 |
4.83 |
-2.4 |
-8.7 |
-12.3 |
-8.4 |
-7.0 |
0.3 |
-4.2 |
-10.5 |
-11.2 |
-11.3 |
-7.9 |
-3.3 |
-0.5 |
-6.7 |
July 31 17:00* |
3 |
4.83 |
5.9 |
3.3 |
0.9 |
2.1 |
3.0 |
1.1 |
2.4 |
-1.4 |
0.3 |
-1.2 |
-1.8 |
-2.0 |
-0.5 |
0.9 |
Aug 9 18:00 |
4 |
6.98 |
5.4 |
3.5 |
2.5 |
2.4 |
3.0 |
1.9 |
2.9 |
2.4 |
3.1 |
-0.7 |
-0.4 |
1.0 |
3.1 |
2.3 |
* adjusted height of downwind array sonics to decrease boom sag
Top, downwind array
Date/time (PDT) |
Config |
Boom ht |
3t |
4t |
5t |
6t |
7t |
8t |
9t |
10t |
11t |
mean |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
June 25 00:00 |
1 |
4.24 m |
-2.1 |
-0.9 |
-0.9 |
0.6 |
-0.6 |
-2.1 |
0.7 |
2.1 |
0.4 |
-0.3 |
July 20 16:00 |
2 |
4.64 |
-3.4 |
-2.9 |
-0.9 |
3.2 |
-3.3 |
-4.5 |
-5.4 |
-5.0 |
-4.6 |
-3.0 |
July 29 12:30 |
3 |
5.83 |
-4.4 |
-5.1 |
-3.1 |
0.6 |
-4.7 |
-6.9 |
-6.8 |
-5.7 |
-4.7 |
-4.5 |
July 31 17:00* |
3 |
5.83 |
2.6 |
0.8 |
0.3 |
2.1 |
2.2 |
5.8 |
7.2 |
4.3 |
3.5 |
3.2 |
Aug 9 18:00 |
4 |
7.98 |
3.8 |
2.5 |
3.5 |
2.6 |
2.0 |
2.1 |
3.6 |
3.1 |
4.6 |
3.1 |
* adjusted height of downwind array sonics to decrease boom sag
Profile sonics
Date/time (PDT) |
Config |
1.5m |
3m |
4m |
5.5m |
7m |
8m |
|
|---|---|---|---|---|---|---|---|---|
June 25 00:00 |
1 |
-1.1 |
-2.2 |
-1.0 |
-1.0 |
-0.7 |
1.0 |
|
July 20 16:00 |
2 |
-0.6 |
-2.7 |
-0.2 |
0.0 |
-0.8 |
0.9 |
|
July 29 12:30 |
3 |
0.2 |
-3.1 |
-0.5 |
-1.3 |
-1.5 |
0.6 |
|
Aug 3 09:00* |
3 |
0.2 |
-3.1 |
-0.5 |
-1.3 |
-1.5 |
-1.0 |
|
Aug 3 09:41** |
3 |
0.2 |
-3.1 |
-0.5 |
-1.3 |
0.2 |
-1.0 |
|
Aug 5 15:25* |
3 |
0.2 |
-3.1 |
-0.5 |
-1.3 |
1.4 |
-0.2 |
|
Aug 9 18:00 |
4 |
-0.8 |
-3.7 |
-2.3 |
-2.5 |
-1.4 |
0.3 |
|
Aug 11 12:15* |
4 |
-0.8 |
-3.7 |
-2.3 |
-2.5 |
-1.4 |
-2.1 |
|
* replaced 7m and/or 8m sonics
** moved 7m sonic up