Below is an email from Mike and graph showing a comparison of the 4 occulted instruments I have data for. The Andor was a 4 channel test instrument and I can not vouch for it's accuracy. We did calibrations but did not do much in the way of characterizations. For the modeled data used with Andor I used the average Hawaii values from my thesis. For the other three occults (HyperPro Hawaii, HyperPro Maryland and FISH Hawaii) I tried to find the closest/best meteorlogical values as inputs. As Mike's graphs show the FISH is the outlier. It might be the large white tent right next to it made the diffuse values higher and so it matches the model better. I think with the data below it is likely the model is high and the measurements are more correct.

Subject: Re: Es occult / Andor
From: Michael Feinholz <mfeinholz@mlml.calstate.edu>
Date: 2/27/2013 4:32 PM
To: Stephanie Flora <twinsf2@gmail.com>

Hi Steph,

I threw out the "Clouds" data points you sent below, and plotted
X = solar zenith  vs  Y = measured / modeled 450nm Diffuse/Direct
and the one outlier is the FISH !

MF

comparison


Stephanie Flora wrote:
Mike

Yea, I am not sure I would 100% believe the Andor data.  I don't think we characterized it very well.  But is does go low like the HyperPro data.

I created the tables below for each experiment.  We only have one instrument which correctly matches the model and that was Resonon.
Maybe if I make a graphs with the 450 nm Diffuse/direct ratio for the model for a few days and locations and add the data from Hyper, Res and Andor to see the effect of zen etc on the model.  Might help with the analysis.

Steph

Resonon Occulted

Date (GMT)                 Zenith       Andor 450nm       Model 450nm
                                       Diffuse/direct       Diffuse/direct
06-Dec-2012 22:45:12        44.22        0.47365        0.43498                        Close to the same

HyperPro occulting in Hawaii
Date (GMT)                 Zenith       Andor 450nm        Model 450nm
                                       Diffuse/direct       Diffuse/direct
12-Sep-2012 00:03:37        28.84        0.20274        0.34789                        Hyper is Low
12-Sep-2012 00:56:57        39.98        0.27142        0.4035
13-Sep-2012 20:39:27        31.77        1.6843         0.35956        Clouds
15-Sep-2012 21:23:44        24.17        0.18127        0.33274
15-Sep-2012 22:06:53        19.30        0.106          0.32065
15-Sep-2012 22:30:00        18.70        0.16935        0.31941
15-Sep-2012 23:31:00        24.37        0.18401        0.33333
16-Sep-2012 22:19:08        19.15        0.15456        0.32034
16-Sep-2012 22:52:39        20.12        0.15765        0.32245
17-Sep-2012 21:45:15        21.84        0.36418        0.32654         Clouds  17-Sep-2012 22:29:23        19.47        0.40859        0.32104         Clouds
17-Sep-2012 22:47:11        20.13        0.28156        0.32248         Clouds
17-Sep-2012 22:49:58        20.31        0.28899        0.3229           Clouds
18-Sep-2012 22:18:20        19.92        0.21297        0.32202
18-Sep-2012 22:26:05        19.84        0.20809        0.32184

Ondruseks East Coast Occult
Date (GMT)                 Zenith       Andor 450nm        Model 450nm
                                       Diffuse/direct       Diffuse/direct
07-Jan-2013 16:32:56        61.96        0.47752        0.70943                        Hyper is Low
07-Jan-2013 16:34:45        61.90        0.52085        0.7076
07-Jan-2013 16:34:45        61.90        0.53808        0.7076


Andor Zenith Angles for the plot below.  All the Es/occulted Es measurements taken on Station 2 (occulted measurement was within 5 minutes of the un-occulted Es)
Date (GMT)                                    Zenith              Andor 450nm        Model 450nm
                                                                                 Diffuse/direct       Diffuse/direct
26-Aug-2005 21:58:15        7.92         0.19215        0.30431                        Andor is low
26-Aug-2005 22:21:23        2.76         0.1604         0.3016
26-Aug-2005 22:22:39        2.54         0.15929        0.30154
26-Aug-2005 23:28:59        14.69        0.15857        0.31211
26-Aug-2005 23:30:15        15.00        0.15828        0.31258
26-Aug-2005 23:31:26        15.28        0.15775        0.31304
26-Aug-2005 23:37:57        16.87        0.18384        0.31572
26-Aug-2005 23:38:41        17.05        0.18167        0.31604
26-Aug-2005 23:39:26        17.23        0.18231        0.31638

On 2/25/2013 7:45 PM, Michael Feinholz wrote:
Thanks for this Steph !
So, is Andor's low-vs-model similar to Hyperpro's low-vs-model ?
Also, I think we should know what date/time this Andor data was
( 9 hr offset @ in-file time ? )
and maybe what the solar zenith angle was ?

I'm wondering if measured-Es-occult vs model-occult is a function
of solar zenith angle ?  I.E. what were the solar zenith's during:
1.) Andor Oahu8 shipboard low-vs-model
2.) Mike O's Oahu13 shipboard low-vs-model
3.) Mike F's post-Oahu13 workbench-by-tent OK-vs-model
4.) Mike O's post-Oahu13 unknown-setup kinda-low-vs model

MF

Stephanie Flora wrote:
Mike

Andor occulted verses the model.  It was a bit tricky.  The andor files were not in GMT so I had to add 9 hours to get the files times to match the logsheet times.  9 Hours seems odd to me. I don't remember much about the system responses either. I don't remember how well this instrument worked.  But the Andor ratio is much lower than the Model.  I would be a big question mark on these results.  The attached report is the only doumentation I could find. Any ideas?



Steph

On 2/22/2013 5:25 PM, Michael Feinholz wrote:
Hi Steph,
Attached is what I have for Oahu8 loggery:
Oahu8_AndorLog.pdf
Oahu8_StationLog_rev2.pdf
Oahu8_WyrtkiLog.pdf

I don't see one occulted kine red line in that there top panel ?
MF

Stephanie Flora wrote:
Mike

I don't seem to have any log sheets for that experiment but I do have the data.  In the attached plot it mentions that the red line is occult-ed.  But it does not look occult-ed to me.  I have data for stations 3 and 4 but I don't see processed data or graphs.  So without log sheets it would be impossible to figure those to out. Could you send the logsheets for stations 2,3 and 4?

Steph

On 2/22/2013 1:25 PM, Michael Feinholz wrote:
Hi Steph,

I didn't want to take everyone's time on the tele to bring this up, but,
Mike O mentioned remembering us doing Es occult on the back deck
of the Wyrtki back in the day.  That was not done via MOS, so I don't
have that data.  That was done with the Andor, so maybe you have
that data (?)...  I found photos & Mark Y. log sheets for this =

Aug-2005, Oahu08, Andor 4x FO = 2x Lu @ MiniMO + Eu + Es
Stn2, GMT 26-Aug-2005, M.Y. stn log notes say "occulted Es"
Stn3, GMT 27-Aug-2005, ditto
Stn4, GMT 28-Aug-2005, ditto

MF