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Inhibition of primary production by UV-B radiation in an arctic bay - model calculations

机译：北极海湾中UV-B辐射抑制一次生产-模型计算

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摘要

Inhibition of primary production by UV-B radiation (UVBR) in Kings Bay, western Spitsbergen, was modelled using measured physical and biological data. The underwater radiation regime was modelled using continuous measurements of incoming radiation and repeated measurements of underwater attenuation of Pho-tosynthetic Active Radiation (PAR) and UVBR. By using attenuation measurements, P/I curves and UVBR sensitivity measurements, we modelled the reduction of primary production in the photic zone for 14 days. We also calculated how the estimate was dependent on the different factors. The model showed that, on average, 2.9% of the primary production was inhibited by UVBR, assuming that the inhibition is a function of the UVBR irradi-ance. If the ozone layer were reduced to 200 DU, the inhibition would increase to 4.4% using unweighted UVBR values. The model indicated that at ambient ozone levels the inhibition was practically independent of the chosen weighting function, but the choice was critical when predicting the effects of a depleted ozone layer. At 200 DU, using DNA weighting, the inhibition was 14.4% but using erythema weighting it was 6.5%. Different P/I curves did not change the estimate while changes in water attenuation gave results in the range 1.6-5.2%. The most uncertain factor in the model was the estimate of the sensitivity of primary production. Using four different in situ incubations, the estimated integrated reduction in primary production caused by UVBR ranged from 0.05-4.1%.
机译：使用测得的物理和生物学数据对在斯匹次卑尔根西部金斯湾的UV-B辐射（UVBR）抑制一次生产进行了建模。使用连续测量入射辐射和重复测量水下光合有效辐射（PAR）和UVBR来模拟水下辐射状况。通过使用衰减测量，P / I曲线和UVBR灵敏度测量，我们模拟了光区14天初级产量的减少。我们还计算了估算值如何取决于不同因素。该模型表明，假设抑制是UVBR辐照度的函数，则平均有2.9％的初级产物被UVBR抑制。如果将臭氧层减少到200 DU，使用未加权的UVBR值，抑制率将增加到4.4％。该模型表明，在环境臭氧水平下，抑制作用实际上与所选的加权函数无关，但在预测耗尽的臭氧层的影响时，选择至关重要。在200 DU下，使用DNA加权，抑制率为14.4％，但使用红斑加权，抑制率为6.5％。不同的P / I曲线没有改变估计值，而水衰减的变化给出了1.6-5.2％的结果。该模型中最不确定的因素是对初级生产敏感性的估计。使用四种不同的原位孵育，估计由UVBR引起的初级生产的综合降低幅度为0.05-4.1％。

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