Previous UV Bulletin

UV bulletins are short reports on current UV levels at NSF network locations. They are posted bi-weekly between September and December when the "ozone hole" is affecting UV levels at our Austral sites.

Bulletin 1/2007, issued 9/11/07
Reporting period: 8/22/07 - 9/10/07

Synopsis:
UV levels at Antarctic sites are small during this part of the year because the Sun's elevation is still low. At Ushuaia, the edge of the ozone hole passed over the town on 24-August and total ozone dropped to 238 DU according to OMI. The UV Index did not exceed 1.2 on this day since the solar elevation at noon was still below 25°.

McMurdo Station, Antarctica:
McMurdo Station was affected by the ozone hole during the last two weeks. However, solar elevations were still below 8° and UV levels remained very low. The maximum UV Index observed during the last three weeks was smaller than 0.3.

Palmer Station, Antarctica:
Palmer Station was affected by the ozone hole between 22-August and 5-September, and also after 9-September. On 3-September, total ozone dropped below 180 DU, according to GUV-511 measurements. UV levels remained small because the Sun did not rise by more than 21° above the horizon during the reporting period. The maximum UV Index, observed on 10-September, was 1.3. Typical summer-time indices range between 8 and 10 with maximum indices exceeding 13.

South Pole, Antarctica:
UV levels were still negligible since the Sun has not risen yet.

Ushuaia, Argentina:
The edge of the ozone hole passed over Ushuaia on 24-August (solar elevation 21°), and total ozone dropped to 238 DU according to OMI. The UV Index was 1.2. The largest UV Index of 1.8 was observed on 8-September (340 DU; solar elevation 30°).

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