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In this study, we report measurements of CFC-12 (CCl 2 F 2) in firn air and in air extracted from shallow ice cores from three Antarctic sites. The firn air data are consistent with the known atmospheric history of CFC-12. In contrast, some of the ice core samples collected near the firn-ice transition exhibit anomalously high CFC-12 levels. Together, the(More)
[1] Carbonyl sulfide (COS) and other trace gases were measured in firn air collected near South Pole (89.98°S) and from air trapped in ice at Siple Dome, Antarctica (81.65°S). The results, when considered with ambient air data and previous ice core measurements, provide further evidence that atmospheric mixing ratios of COS over Antarctica between 1650 and(More)
[1] Measurements of methyl chloride (CH 3 Cl) in Antarctic polar ice and firn air are used to describe the variability of atmospheric CH 3 Cl during the past 300 years. Firn air results from South Pole and Siple Dome suggest that the atmospheric abundance of CH 3 Cl increased by about 10% in the 50 years prior to 1990. Ice core measurements from Siple Dome(More)
We sampled interstitial air from the perennial snowpack (firn) at a site near the West Antarctic Ice Sheet Divide (WAIS-D) and analyzed the air samples for a wide variety of gas species and their isotopes. We find limited convec-tive influence (1.4–5.2 m, depending on detection method) in the shallow firn, gravitational enrichment of heavy species(More)
Ice load causes important faults on electric transmission lines (ETL), and power outages can be seen for days because of ice load. So, ice load effect must be prevented on ETL. One of the effect methods is Joule Effect Method (JEM). In JEM, ETL conductor is heated by current, and ice on conductor is melted. But primarily ice load amount must be determined(More)
Aerial lines are designed according to the calculated a certain ice load amount. If ice load amount on conductor of aerial line is bigger than the calculated ice load amount, aerial line pole bending or conductor breakage can be seen. Joule effect method is proposed to eliminate ice load effect but primarily, the occurred ice load amount on conductor of(More)
6 [1] Carbonyl sulfide (COS) and other trace gases were measured in firn air collected near 7 South Pole (89.98°S) and from air trapped in ice at Siple Dome, Antarctica (81.65°S). The 8 results, when considered with ambient air data and previous ice core measurements, 9 provide further evidence that atmospheric mixing ratios of COS over Antarctica between(More)
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