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h2. Advection Horizontal Array Turbulence Study

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h3. Photos

* [Setup|Setup Photos]
* [Wide Array|Wide Array Photos]
* [Medium Array|Medium Array Photos]
* [Medium Array Staggered|Medium Array Staggered Photos]
* [Narrow Array|Narrow Array Photos]

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h3. Logbook Entries

See [All Log Entries] for a listing of the titles of the AHATS log entries.
See [All Log Contents] for a page displaying all the log entries. This takes a while to be rendered...
See [Sonic Entries] to view entries with a label of "sonic".
See [Pressure Entries] to view entries with a label of "pressure".

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h3. Search

To search only these AHATS pages, use this search:
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h3. Chronology

|| Start (PDT) \\ || End (PDT) \\ || || horiz spacing || downwind heights || upwind height ||
|| June 9, 2008 || || setup begins || || || ||
|| June 25 12:00 || July 1   12:17 || widely spaced array, lowest heights || 3.99 m \\ || 3.3 and 4.3 m || 3.8 m ||
|| July 1    12:55 || July 18 05:55 || wide array, lowest heights || 3.99 m \\ || 3.3 and 4.3 m || 3.3 m ||
|| July 20  16:00 || July 29 06:00 || medium spaced array, lowest heights || 1.29 m \\ || 3.37 and 4.37 m || 3.37 m ||
|| July 29  12:30 || Aug 8   06:00 || medium spaced array, medium heights || 1.29 m \\ || 4.8 and 5.8 m || 4.8 m ||
|| Aug 9    18:00 || Aug 16 09:00 || narrow spaced array, highest heights || 0.42 m \\ || 7.0 and 8.0 m || 7.0 m ||
|| August 16 || || teardown begins || || || ||

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h3. Sonic Anemometer Post-Processing


h5. Data editing



The AHATS sonic data have been edited to remove obviously bad data, putting NA's in the cal_files when the 5-minute averages of the sonic diagnostic variable exceeded \~0.5.  During the first configuration, these usually occurred simultaneously on all channels of one of the four sonic adams, suggesting that the adam could not keep up with data ingest when there were transmission problems back to the base.  After the first configuration, simultaneous problems on all channels of an adam occurred less frequently and with smaller 'diag' values.  Then most of the high 'diag' values were associated with the beginning or end of a period of lost data.




 For configuration 4, after August 8, sonic 6u had recurring continuous periods in the middle of the day with 'diag' values between 0.05 and 0.1.  I did not edity these out because it would have removed a significant fraction of the data from 6u during configuration 4.

h5. Sonic zero-wind offsets

Prior to the field project, all sonics were checked for zero-wind offsets at room temperature.  Those with offsets larger than 4-5 cm/s were returned to the manufacturer for recalibration.  Following the project, we repeated this test and found that 26 out of 41 sonics had offsets exceeding 4-6 cm/s.  A few had offsets up to 20-30 cm/s.  We do not know when or at what rate these changes occurred.


Subsequently, we have run each of the sonics used in AHATS in a zero-wind chamber inside a temperature-controlled chamber in the NCAR Sensor Calibration Laboratory to determine the offsets for each wind component.  This is similar to one aspect of the manufacturer's recalibration process wherein offsets are determined as a function of temperature and entered into the sonic firmware for correction of the measured wind data. The chamber temperature was ramped from 60 C down to \-30 C over a 6-hour time period (black lines), then back up to 60 C over a second 6-hour time period (red lines), and finally allowed to cool down with the temperature control turned off (green lines).   Data collection was terminated at somewhat arbitrary times during the last cool-down phase.


The following table lists the sonics by serial number (and location) and includes links to plots of NCAR post-project measurements of the wind offsets as a function of temperature.  The table also lists the maximum offset (cm/s) for each orthogonal wind component and the temperature at which the maximum occurs.

||   CSAT S/N \\ ||      Location**\* \\ || || u.off \\ || @T \\ || v.off \\ || @T \\ || w.off \\ || @T \\ ||
|| Config [1|ahatslogbook:/2008/06/26/Sonic Locations at Setup for Wide Array|config 1 sonic IDs], [2|ahatslogbook:/2008/07/21/Configuration 2 Sonic configs|config 2 sonic IDs], [4|ahatslogbook:/2008/08/12/sonic IDs|config 4 sonic IDs] || || || cm/s \\ || deg C \\ || cm/s \\ || deg C \\ || cm/s \\ || deg C \\ ||
| [0247|^CSAT0247.pdf|CSAT 0247 offsets]\\ | 11t \\ | | 2 \\ | 30 \\ | 8 \\ | 50 \\ | \-4 \\ | 50 \\ |
| [0364|^CSAT0364.pdf|CSAT 0364 offsets]\* \\ | 8b \\ | | \-6 \\ | 20 \\ | 8 \\ | 20 | \-7 \\ | 35 |
| [0366|^CSAT0366.pdf|CSAT 0366 offsets]\\ | 10t \\ | | 7 \\ | 35 | \-6 \\ | 40 | 4 \\ | 50 |
| [0367\*|^CSAT0367.pdf|CSAT 0367 offsets]\\ | 9t \\ | | 9 \\ | 30 \\ | 8 \\ | 25 \\ | 2 \\ | 25 \\ |
| [0369|^CSAT0369.pdf|CSAT 0369 offsets]\\ | 8m  [aug 3|ahatslogbook:/2008/08/03/replaced 8m profile sonic|replaced 8m profile sonic]\-5 \\
7m [from aug 5|ahatslogbook:/2008/08/05/spd 8m now highest|spd 8m now highest]\\ | | \-8 \\ | 40 \\ | \-13 \\ | 50 \\ | \-1 \\ | 50 \\ |
| [0370|^CSAT0370.pdf|CSAT 0370 offsets]\\ | 5t  [config 4|ahatslogbook:/2008/08/07/quickie status|quickie status August 7]\\ | | 5 \\ | 50 | \-4 \\ | 50 | \-2 \\ | 45 \\ |
| [0376|^CSAT0376.pdf|CSAT 0376 offsets]\\ | 6b \\ | | 15 \\ | 50 | \-3 \\ | 50 | 3 \\ | 50 |
| [0377|^CSAT0377.pdf|CSAT 0377 offsets]\\ | 12b \\ | | 16 \\ | 30 | \-8 \\ | 40 | \-3 \\ | 40 |
| [0378|^CSAT0378.pdf|CSAT 0378 offsets]\\ | 8t | | 7 \\ | 20 | 8 | 40 | \-3 \\ | 35 |
| 0536 \\ | 4u \\ | | | | | | | |
| 0537 \\ | 5.5m \\ | | | | | | | |
| 0538 \\ | 10b \\ | | | | | | | |
| 0539 \\ | 3u \\ | | | | | | | |
| 0540 \\ | 7t \\ | | | | | | | |
| 0671 \\ | 7b \\ | | | | | | | |
| 0672 \\ | 6t \\ | | | | | | | |
| 0673 \\ | 8u \\ | | | | | | | |
| 0674*\* \\ | 6u \\ | | 20 \\ | 25 \\ | 12 \\ | 30 \\ | 1 \\ | 10 \\ |
| 0677 \\ | 5u \\ | | | | | | | |
| 0712 \\ | 5t  [config 1-3|ahatslogbook:/2008/08/07/quickie status|quickie status Aug 7]\\ | | | | | | | |
| 0720 \\ | 7m [until aug 5|ahatslogbook:/2008/08/05/spd 8m now highest|spd 8m now highest]\\
8m [from aug 5|ahatslogbook:/2008/08/05/spd 8m now highest|spd 8m now highest]\-12 \\ | | | | | | | |
| [0732|^CSAT0732.pdf|CSAT 0732 offsets]\\ | 1.5m | | \-10 | 40 \\ | 7 \\ | 40 | 4 \\ | 40 \\ |
| 0733 \\ | 8m [until aug 3|ahatslogbook:/2008/08/03/replaced 8m profile sonic|replaced 8m profile sonic]\\
8m [after aug 12|ahatslogbook:/2008/08/12/misc stuff|replaced sonic 720 with 733]\\ | | | | | | | |
| 0738 \\ | 3t | | | | | | | |
| 0739 \\ | 3m [after june 27|ahatslogbook:/2008/06/27/Changed 3m profile sonic|changed 3m profile sonic]\\
(also 13b config 2) \\ | | | | | | | |
| 0740 \\ | 4m (13b config 3) \\ | | | | | | | |
| [0741|^CSAT0741.pdf|CSAT 0741 offsets]\* \\ | 13b config1 \\
2b [config 2-4|ahatslogbook:/2008/07/21/Replaced sonic 2b (SN 1117) with 13b (SN 0741).|Replaced sonic 2b]\\ | | 15 \\ | 50 \\ | \-30 \\ | 50 \\ | \-3 \\ | 50 \\ |
| [0743|^CSAT0743.pdf|CSAT 0743 offsets]\* \\ | 9b \\ | | \-13 \\ | 20 \\ | 13 \\ | 33 \\ | 5 \\ | 30 \\ |
| [0744|^CSAT0744.pdf|CSAT 0744 offsets]\\ | 4b \\ | | \-9 \\ | 50 | \-12 \\ | 50 | \-3 \\ | 50 |
| [0745|^CSAT0745.pdf|CSAT 0745 offsets]\\ | 5b | | 5 \\ | 47 \\ | 5 \\ | 40 \\ | \-4 \\ | 50 |
| 0800 \\ | 3b \\ | | | | | | | |
| 0853 \\ | 1b \\ | | | | | | | |
| 0855 \\ | 11b \\ | | | | | | | |
| 0856*\* \\ | 4t \\ | | 7 \\ | 25 | 2 \\ | 15 | \-8 | 40 |
| 1117 \\ | 2b  [config 1|ahatslogbook:/2008/07/21/Replaced sonic 2b (SN 1117) with 13b (SN 0741).|replaced sonic 2b]\\ | | | | | | | |
| 1119 \\ | 7u \\ | | | | | | | |
| 1120 \\ | 13b config 4 \\ | | | | | | | |
| 1121 \\ | 9u \\ | | | | | | | |
| 1122 \\ | 11u \\ | | | | | | | |
| 1123 \\ | 10u \\ | | | | | | | |
| 1124 \\ | 3m [until june 27|ahatslogbook:/2008/06/27/Changed 3m profile sonic|changed 3m profile sonic] | | | | | | | |

\*cycle-slip errors cause jumps in temperature and wind offsets, generally at low temperatures

\**data from Campbell recalibration



\***Location notation: u = upwind (numbered from NE to SW); b = downwind, bottom; t = downwind, top; ht(m) = profile tower




h3. Other Links

* [Pre-project site surveys|http://www.eol.ucar.edu/rtf/projects/AHATS/isff/site_survey.shtml]
* [Logbook for pre-project flow distortion tests at Marshall|http://www.eol.ucar.edu/rtf/projects/AHATS/isff/logbook]

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h3. How to Edit this Wiki

First login by clicking on "Log In" at the upper right. Then see [How to Edit the logbook wiki].

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h3. ToDo List

{tasklist:AHATS ToDo|sortBy=date}
||Completed||Priority||Locked||CreatedDate||CompletedDate||Assignee||Name||
|F|M|F|1242926165698|          |maclean|fix nidas|
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{tasklist:AHATS Software ToDo|sortAscending=false|sortBy=priority}
||Completed||Priority||Locked||CreatedDate||CompletedDate||Assignee||Name||
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h3. [Phone Numbers and Addresses|ahatslogbook:AHATS Phones and Addresses]

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