Diaz S, Camilión C, Deferrari G, Fuenzalida H, Armstrong R, Booth C, Paladini A, Cabrera S, Casiccia C, Lovengreen C, Pedroni J, Rosales A, Zagarese H, Vernet M
Centro Austral de Investigaciones Científicas/Consejo Nacional de Investigaciones Científicas y Técnicas, Ushuaia, Argentina.
Photochem Photobiol. 2006 Jul-Aug;82(4):834-43. doi: 10.1562/2005-09-26-RA-697.
Ozone and UV radiation were analyzed at eight stations from tropical to sub-Antarctic regions in South America. Ground UV irradiances were measured by multichannel radiometers as part of the Inter American Institute for Global Change Radiation network. The irradiance channels used for this study were centered at 305 nm (for UV-B measurements) and 340 nm (for UV-A measurements). Results were presented as daily maximum irradiances, as monthly averaged, daily integrated irradiances and as the ratio of 305 nm to 340 nm. These findings are the first to be based on a long time series of semispectral data from the southern region of South America. As expected, the UV-B channel and total column ozone varied with latitude. The pattern of the UV-A channel was more complex because of local atmospheric conditions. Total column ozone levels of < 220 Dobson Units were observed at all sites. Analysis of autocorrelations showed a larger persistence of total column ozone level than irradiance. A decreasing cross-correlation coefficient between 305 and 340 nm and an increasing cross-correlation coefficient between 305 nm and ozone were observed at higher latitudes, indicating that factors such as cloud cover tend to dominate at northern sites and that ozone levels tend to dominate at southern sites. These results highlight the value of long-term monitoring of radiation with multichannel radiometers to determine climatological data and evaluate the combination of factors affecting ground UV radiation.
在南美洲从热带到亚南极地区的八个站点对臭氧和紫外线辐射进行了分析。地面紫外线辐照度由多通道辐射计测量，作为美洲全球变化辐射网络的一部分。本研究使用的辐照度通道以305纳米（用于紫外线B测量）和340纳米（用于紫外线A测量）为中心。结果以每日最大辐照度、月平均每日积分辐照度以及305纳米与340纳米的比值呈现。这些发现首次基于南美洲南部地区长时间的半光谱数据系列。正如预期的那样，紫外线B通道和总臭氧柱随纬度变化。由于当地大气条件，紫外线A通道的模式更为复杂。在所有站点都观测到总臭氧柱水平低于220多布森单位。自相关分析表明，总臭氧柱水平的持续性大于辐照度。在较高纬度地区，观测到305纳米与340纳米之间的交叉相关系数降低，305纳米与臭氧之间的交叉相关系数增加，这表明云量等因素在北部站点往往占主导地位，而臭氧水平在南部站点往往占主导地位。这些结果突出了使用多通道辐射计长期监测辐射以确定气候数据并评估影响地面紫外线辐射的因素组合的价值。
