Adjustments to GOES-16 Radiances in Visible and near-Infrared Channels

April 29th, 2017 |

GOES-16 Visible (0.64) Imagery at 1145 UTC and 1200 UTC on 29 April 2017, before and after, respectively, a calibration change (Click to enlarge)

Reflectance values detected near Solar Noon over thick clouds can exceed 1 (i.e., the albedo will exceed 100%) because of contributions (caused by scattering) to a pixel from neighboring pixels. A fix that allows for these larger-than-one reflectance values in the GOES-16 Processing is scheduled to take place in July. Until July the values exceeding one will be treated as missing in AWIPS. The change discussed in this blog post, below, implemented on 29 April 2017, should reduce the number of those missing pixels.

GOES-16 has on-orbit calibration of visible and near-infrared channels. This is in contrast to legacy GOES (GOES-13, GOES-14 and GOES-15); the lack of on-orbit calibration means that visible imagery from GOES-13 and GOES-15 show different reflectance values, as shown in this image from 2000 UTC on 01 May 2017: GOES-13 shows smaller reflectance (the right half of the image) than GOES-15 (the left half of the image). Such degradation should not occur with GOES-16.

On-orbit calibration is achieved by viewing the Sun for a set period and determining the photons detected. That value is then related to the amount of solar energy reflected back from the Earth from bright surfaces. It’s important that the exact amount of time for the solar view is known; otherwise the reflectance cannot be calibrated correctly.

NESDIS Engineers and the NOAA CWG (Calibration Working Group) determined in April that visible and near-infrared reflectances were too large (by up to 10%) because the amount of time viewing the Sun was different than the time-value used in the calibration. Shortly before 1200 UTC on 29 April a change in the calibration module was made to mitigate this mis-match. Reflectances dropped about 10% because of this calibration change.

The animation above shows GOES-16 0.64 imagery before and after the calibration change and it’s difficult to note a reduction in the brightness; however, a scatterplot of the reflectance over the convection that is over the tropical Atlantic east of the Amazon (click here to see the region, it is shaded in purple; this image shows the 1145 UTC image with the region toggled on and off) does show higher values at 1145 vs. 1200 UTC, at a time during the day when the rising Sun should cause increases in reflectance. (A similar plot of 1215 UTC vs. 1200 UTC shows reflectance values with no bias).

Density Diagram of GOES-16 Reflectance Values at 1145 UTC (x-axis) vs. GOES-16 Reflectance Values at 1200 UTC (y-axis) (Click to enlarge)

Imagery in this blog post was created using the Satellite Information Familiarization Tool (SIFT).

GOES-16 data posted on this page are preliminary, non-operational data and are undergoing testing.

Hurricane Matthew moves into the Bahamas

October 5th, 2016 |
morphedmw_matthew_last48hrs_ending5oct_1000

Morphed Microwave Imagery showing the eye of Matthew from 1400 UTC 3 October through 1345 UTC 5 October (Click to enlarge)

The animation of Matthew, above, from morphed microwave imagery (from this site), shows the toll that interaction with the high terrain of Hispaniola and eastern Cuba has had on the storm (causing it to be downgraded from Category 4 to Category 3 intensity). The formerly distinct eye had eroded, although eye re-formation occurs at the end of the animation. Once again, a comparison of microwave vs infrared imagery revealed that the well-defined eye structure was much more apparent using microwave data. Strengthening/Re-organization of Matthew in the near term will be governed by Sea Surface Temperatures (that are warm) and wind shear (shown below, from this site, that is weak).

wg8shr_0900_5october2016

Diagnosed wind shear, 0900 UTC on 5 October 2016 (Click to enlarge)

Total Precipitable Water fields (from this site, using data from here), below, show abundant moisture surrounding Matthew at its present position. There is dry air over the eastern United States landmass, however.

Morphed Total Precipitable water from MIRS, 1300 UTC 4 October – 1200 UTC 5 October (Click to enlarge)

Morphed Total Precipitable water from MIRS, 1300 UTC 4 October – 1200 UTC 5 October (Click to enlarge)

During the morning and afternoon hours, the satellite presentation of Matthew began to slowly improve on GOES-13 Visible (0.63 µm) and Infrared Window (10.7 µm) imagery, below (MP4 | animated GIF), with well-defined convective bursts seen later in the day. Note: the noise seen on the 1645 UTC images was due to solar RFI.

GOES-13 0.63 µm Visible (left) and 10.7 µm Infrared Window (right) images [Click to play animation]

GOES-13 0.63 µm Visible (left) and 10.7 µm Infrared Window (right) images [Click to play animation]

GOES-14 Sounder Operations

January 31st, 2016 |

GOES-14 Sounder DPI of Total Precipitable Water (TPW) at 1800 UTC on 31 January 2016 [Click to enlarge]

GOES-14 Sounder DPI of Total Precipitable Water (TPW) at 1800 UTC on 31 January 2016 [click to enlarge]

GOES-14, over the Equator at ~105º W Longitude, has been activated in support of SRSO-R Operations in February 2016. One-minute imagery will commence on Monday 1 February. The GOES-14 Sounder has also been activated to fill in, temporarily, for the GOES-13 Sounder that has been inactive since November 2015. An animation of all 19 Sounder channels is available at this link; animations of Derived Product Images (DPI) of Total Precipitable Water from GOES-14, as shown above, are available here, with GOES-14 DPI of Lifted Index available here.

GOES-13 Sounder Anomalies

November 23rd, 2015 |

GOES-15 Visible (0.63 µm) images [click to play animation]

GOES-13 Sounder Band 5 Infrared (13.4 µm) images, 0847 and 0947 UTC on 20 November [click to enlarge]

On 20 November, at 0922 UTC, the GOES-13 Sounder experienced an anomaly (the GOES-13 Sounder had Filter Wheel anomalies in 2012 as well: Link; Link). GOES Engineers determined that the Filter Wheel had stopped moving (the filter wheel aligns the infrared detectors with the incoming data) so data were not scanned. The image above shows the 13.4 µm (a CO2 channel) image before and after the anomaly. All 18 infrared channels are affected; the visible channel (band 19) continues sending usable data. GOES Engineers continue to investigate the problem. GOES Sounder derived products (such as Total Precipitable Water) are affected, and are no longer being produced or disseminated (Link). From an email from SSD: (Link)

*Update #2: * **Effective immediately; all the GOES-13 (GOES-East)
sounding products are ceased to produce and stop distribution as we are
experiencing an anomaly with the sounder instrument. Engineers are
investigating the problem. We will inform you when we resume our normal
operations.

*Update #1: * GOES-13 (GOES-East) Sounder IR Data Outage

*Topic:* GOES-13 (GOES-East) Sounder IR Data Products Outage

*Date/Time**Issued:*November 20, 2015 1955Z*
*

*Product(s) or Data Impacted:*

GOES-13 (GOES-East) Sounder data
Blended Hydrometorological Products – Blended TPW
Microwave AWIPS Products – Blended TPW
Microwave McIDAS Products – Blended TPW
GOES Gridded Cloud Product
GOES VARiable data
AFEP/Ingestor – GOES
N-AWIPS Ingest
Single Field of View BUFR
Single Field of View SDPI for AWIPS
Single Field of View TPW
Sounding ASOS SCSP
Web Pages

*Date/Time of Initial Impact:*November 20, 2015 0922Z **

*Date/Time of Expected End:* TBD

*Length of Outage:* TBD

*Details/Specifics of Change:*GOES-13 (GOES-East) Sounder instrumentis experiencing an anomaly. Engineers are investigating the problem. GOES-13 Sounder IR data is not available. **Effective immediately all the GOES-13 (GOES-East) sounding products are ceased to produce and stop distribution as we are experiencing an anomaly with the sounder instrument. Engineers are investigating the problem. We will inform you when we will resume our normal operations.


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Update 19 January 2016
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GOES-14 is scheduled to broadcast 1-minute SRSO-R data starting 1 February. GOES-14 will be activated on 25 January, with a maneuver shortly thereafter. It is likely that GOES-14 Sounder data will be broadcast from 1-25 February (GOES-14 Sounder Timing will be adjusted to match GOES-13 Sounder Timing) when the GOES-14 Imager is broadcasting SRSO-R data.