# Missing shortwave irradiance in some GS01SUMO files?

**URL:** <https://discourse.oceanobservatories.org/t/missing-shortwave-irradiance-in-some-gs01sumo-files/113>\
**Category:** HelpDesk\
**Tags:** cgsn\
**Created:** [January 13, 2021, 4:51pm UTC](https://discourse.oceanobservatories.org/t/missing-shortwave-irradiance-in-some-gs01sumo-files/113 "2021-01-13T16:51:49Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![natalie.freeman](https://avatars.discourse-cdn.com/v4/letter/n/ec9cab/32.png) [@natalie.freeman](https://discourse.oceanobservatories.org/u/natalie.freeman)\
**Post date:** [January 13, 2021, 4:51pm UTC](https://discourse.oceanobservatories.org/t/missing-shortwave-irradiance-in-some-gs01sumo-files/113/1 "2021-01-13T16:51:50Z")

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Hi OOI,

I’m finding that both

_deployment0002\_GS01SUMO-SBD11-06-METBKA000-recovered\_host-metbk\_a\_dcl\_instrument\_recovered\_20151217T000015.142000-20161128T070124.679000.nc_

and

_deployment0002\_GS01SUMO-SBD12-06-METBKA000-telemetered-metbk\_a\_dcl\_instrument\_20151214T202007.614000-20161205T090519.331000.nc_

files are missing realistic shortwave irradiance values ( **‘shortwave\_irradiance’** and **‘met\_netsirr’** variables; these are at ~minute intervals) while the shortwave variables found in the associated hourly file look great:

_deployment0002\_GS01SUMO-SBD12-06-METBKA000-recovered\_host-metbk\_hourly\_20151214T205007.614000-20161212T072920.236000.nc_.

Please advise. Crossing my fingers that these ~minute data are available.

Thanks!  
-Natalie

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**Author:** ![swhite](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.oceanobservatories.org/swhite/32/31_2.png) [@swhite](https://discourse.oceanobservatories.org/u/swhite)\
**Post date:** [January 15, 2021, 7:27pm UTC](https://discourse.oceanobservatories.org/t/missing-shortwave-irradiance-in-some-gs01sumo-files/113/2 "2021-01-15T19:27:14Z")

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Natalie,

I’m looking into this issue now. I know there was an issue with the METBK1 SWR unit (on SBD11) as noted in the annotations:  
_UPDATED, 2019-07-18: The correction for the data collected by SWR 273 on GS01SUMO-00002 for the time period indicated by the annotation dates is Offset: -15.92493 W/m^2, Slope: 1.01124; applying this correction brings this module back in line with our standards. \* Downwelling Shortwave Irradiance (shortwave\_irradiance) and Net Shortwave Irradiance (met\_netsirr) minimum night time values jump from ~0 W m-2 to ~13-14 W m-2 and remain there through the rest of the deployment. The SWR sensor did not appear to have any noticeable damage upon recovery. The WHOI instrument calibration lab is investigating (Redmine 12543)_

But you are seeing this both for METBK1 (on SBD11) and on METBK2 (on SBD12)?

Thanks and stay safe,  
Sheri

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**Author:** ![natalie.freeman](https://avatars.discourse-cdn.com/v4/letter/n/ec9cab/32.png) [@natalie.freeman](https://discourse.oceanobservatories.org/u/natalie.freeman)\
**Post date:** [January 15, 2021, 8:33pm UTC](https://discourse.oceanobservatories.org/t/missing-shortwave-irradiance-in-some-gs01sumo-files/113/3 "2021-01-15T20:33:32Z")

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Thanks for your reply, @swhite.

In looking at the **SBD12** file again, I see I made a mistake in my interpretation (in my quick netcdf file viewer, the limited # of observations in the SBD12 file appeared as one spike), so please disregard my original inquiry for that file. Apologies.

As for **SBD11** , where are these annotations available so that I don’t miss any of these going forward (and so that I can be sure to apply this offset and slope to ‘the time period indicated by the annotation dates’)? And is there a notification I can sign up for for when/if new announcements or changes to the data I’m using occur in future?

Thanks so much,  
-Natalie

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**Author:** ![swhite](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.oceanobservatories.org/swhite/32/31_2.png) [@swhite](https://discourse.oceanobservatories.org/u/swhite)\
**Post date:** [January 24, 2021, 7:22pm UTC](https://discourse.oceanobservatories.org/t/missing-shortwave-irradiance-in-some-gs01sumo-files/113/4 "2021-01-24T19:22:07Z")

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Natalie,

Yes, the annotations can be viewed in the OOI Data Portal ([https://ooinet.oceanobservatories.org/](https://ooinet.oceanobservatories.org/)) or OOI Data Explorer ([https://dataexplorer.oceanobservatories.org/](https://dataexplorer.oceanobservatories.org/)) for various datasets.  
They can also be obtained via M2M by setting the proper parameters. See this example in GitHub:  
[2018-data-workshops/Example\_1\_Requesting\_OOI\_Data.ipynb at master · ooi-data-review/2018-data-workshops · GitHub](https://github.com/ooi-data-review/2018-data-workshops/blob/master/chemistry/examples/Example_1_Requesting_OOI_Data.ipynb)  
(Look about 2/3rds down the page).

Thanks and stay safe,  
Sheri

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<div class="post-metadata">

**Author:** ![natalie.freeman](https://avatars.discourse-cdn.com/v4/letter/n/ec9cab/32.png) [@natalie.freeman](https://discourse.oceanobservatories.org/u/natalie.freeman)\
**Post date:** [February 1, 2021, 7:19pm UTC](https://discourse.oceanobservatories.org/t/missing-shortwave-irradiance-in-some-gs01sumo-files/113/5 "2021-02-01T19:19:51Z")

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Thanks again, @swhite, I appreciate your help.

-Natalie

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**Author:** ![swhite](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.oceanobservatories.org/swhite/32/31_2.png) [@swhite](https://discourse.oceanobservatories.org/u/swhite)\
**Post date:** [February 1, 2021, 7:49pm UTC](https://discourse.oceanobservatories.org/t/missing-shortwave-irradiance-in-some-gs01sumo-files/113/6 "2021-02-01T19:49:12Z")

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