Suomi-NPP VIIRS Visible (0.64 µm) images [click to enlarge]

Suomi-NPP VIIRS Visible (0.64 µm) images (above) revealed numerous cloud plumes that were emanating from natural gas flaring sources at oil drilling sites across the North Slope of Alaska on 08 February 2022. Surface air temperatures were around -50°F in that area, with Deadhorse setting a daily record low of -53°F.

A sequence of Suomi-NPP VIIRS Visible (0.64 µm), Shortwave Infrared (3.74 µm) and Infrared Window (11.45 µm) images is shown below. The cloud plumes appeared significantly warmer in the 3.74  µm images due to reflected incoming solar radiation — and warmer in the 11.45 µm images since those cloud tops were located within the warmer air aloft of a pronounced boundary layer temperature inversion (00 UTC Barrow rawinsonde plot | text).

Suomi-NPP VIIRS Visible (0.64 µm), Shortwave Infrared (3.74 µm) and Infrared Window (11.45 µm) images [click to enlarge]

A closer view of the Suomi-NPP VIIRS Shortwave Infrared image at 2339 UTC (below) included a cursor readout, which indicated gas flaring point source infrared brightness temperatures as warm as +21.6°C (orange pixels).

Suomi-NPP VIIRS Shortwave Infrared (3.74 µm) image at 2339 UTC [click to enlarge]

Carl Dierking from GINA at the University of Alaska/Fairbanks noted this event as well, discussed here. The toggle above compares a Day Land Cloud RGB and a slightly later Day Night Band image. A light source (that is, burning flares) exists at the head of each cloud plume.

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