New Evidence for the Importance of Non‐Stomatal Pathways in Ozone Deposition During Extreme Heat and Dry Anomalies

New Evidence for the Importance of Non‐Stomatal Pathways in Ozone Deposition During Extreme Heat and Dry Anomalies
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极热和干燥异常期间非气孔途径在臭氧沉积中重要性的新证据

DOI:
10.1029/2021gl095717
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发表时间:
2022
影响因子:
5.2
通讯作者:
Munger, J. W.
Munger, J. W.
中科院分区:
地球科学1区
文献类型:
--
作者:
Wong, A. Y. H.;Geddes, J. A.;Ducker, J. A.;Holmes, C. D.;Fares, S.;Goldstein, A. H.;Mammarella, I.;Munger, J. W.

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干沉降可以部分解释观测到的环境臭氧对极端炎热和干燥事件的反应。我们使用三个长期共存的生态系统尺度的二氧化碳,水蒸气和臭氧通量测量记录来研究臭氧沉积对热和干燥异常的响应。我们发现,正如预期的那样,冠层气孔导度一般在干燥的空气或土壤的日子里下降。然而,在炎热的日子里,推断所有三个地点的非气孔导度都同时增加,这可能与当前一代大叶模型中未代表的几个温度敏感过程有关。这可能抵消气孔导度的降低,导致总沉积速度的较小净减少,甚至净增加。我们发现沉积速度对土壤干燥度的响应可能与其对光合活性的影响有关,尽管存在相当大的变异性。我们的研究结果强调需要更好地理解和代表非气孔臭氧沉积。
Dry deposition could partially explain the observed response in ambient ozone to extreme hot and dry episodes. We examine the response of ozone deposition to heat and dry anomalies using three long‐term co‐located ecosystem‐scale carbon dioxide, water vapor and ozone flux measurement records. We find that, as expected, canopy stomatal conductance generally decreases during days with dry air or soil. However, during hot days, concurrent increases in non‐stomatal conductance are inferred at all three sites, which may be related to several temperature‐sensitive processes not represented in the current generation of big‐leaf models. This may offset the reduction in stomatal conductance, leading to smaller net reduction, or even net increase, in total deposition velocity. We find the response of deposition velocity to soil dryness may be related to its impact on photosynthetic activity, though considerable variability exists. Our findings emphasize the need for better understanding and representation of non‐stomatal ozone deposition.
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