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Winds - Measuring ocean winds from space
Iceberg B10A Breakup
Iceberg B10A Breakup

B10A (the famous super iceberg found by QuikScat) broke up just west of South Georgia Island last week. A22B, an equally large iceberg is nearby. Currently, BYU is supplying the location of these icebergs with the aid of the near-real-time processing to the National Ice who is issuing mariner's alerts.

This image shows a time sequence of enhanced resolution scatterometer observations of B10A's break up on JD11, 2000 near South Georgia Island in the South Atlantic. A22B is nearby.

The image consists of 6 rows of images with time running to the right. For each day there are two images, one morning and one evening. The top row images were created from Seawinds 13.5 GHz V-pol 'eggs' using the SIR resolution enhancement algorithm. The pixel resolution is ~2.225 km. The second row was created from Seawinds 13.5 GHz H-pol 'eggs'. The last rows were created from 'slices' measurements using the SIRF resolution enhancement algorithm while the center rows were done with the AVE algorithm.

Note that the intrinsic resolution of the SeaWinds sensor is approximately 7x25 km but is improved with the algorithms. Since the algorithms tend to have artifacts over the ocean, seeing all the versions can be helpful for interpretting the images. The ocean appears dark when the wind speed is low and lightens for higher wind speeds which accounts for the lightening and darkening of the images. Generally, glacial ice shows up brightly against the ocean, but can be hid when the wind speed is high. The images show that on JD9 B10A is in one piece but that by JD12 it is clearly in multiple pieces.

Credit: NASA/JPL


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