Factors determining the robustness of AOT40 and other ozone exposure indices
Factors determining the robustness of AOT40 and other ozone exposure indices
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DOI：
10.1016/s1352-2310(01)00086-3
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发表时间：
2001-07-01
影响因子：
5
通讯作者：
Tuovinen, JP
中科院分区：
文献类型：
--
作者：
Sofiev, M;Tuovinen, JP
鲁棒性问题被认为是描述植被暴露于臭氧的不利影响的数学指数。结果表明，其中一些可能表现出无限高的灵敏度的暴露估计臭氧浓度或特定功能的内部参数的小变化。特别是，对于超过40 ppb（AOT 40）指数阈值的累积暴露，这种情况并不特殊，而是描述了北方欧洲偏远地区的常见情况。考虑到计算的和观测到的臭氧浓度不可避免地存在不确定性，臭氧影响指数的高度敏感性导致了接触估计值的不稳定性，并在其使用中产生了问题。理论上考虑的问题，使制定的必要条件和充分条件的有限灵敏度的时间积分指数。一个例子的修改后的AOT制定满足所获得的标准，因此没有遇到的敏感性问题被认为是。(C)2001爱思唯尔科技有限公司版权所有。
The robustness problem is considered for mathematical indices that describe the adverse effects of vegetation exposure to ozone. It is shown that some of them may demonstrate infinitely high sensitivity of the exposure estimate to small variations of ozone concentrations or internal parameters of specific functional. In particular, For the accumulated exposure over a threshold of 40 ppb (AOT40) index such conditions are not extraordinary, but rather describe quite often situations in remote areas in Northern Europe. Taking into account inevitable uncertainties in both calculated and observed ozone concentrations, a high sensitivity of ozone impact indices results in an instability of the exposure estimates and creates problems in their use. Theoretical consideration of the problem enabled to formulate the necessary nd sufficient conditions for the limited sensitivity of a time-integrating index. An example of a modified AOT formulation fulfilling the obtained criteria and hence not experiencing the sensitivity problem is considered. (C) 2001 Elsevier Science Ltd. All rights reserved.