التفاصيل البيبلوغرافية
| العنوان: |
Interannual variability of terpenoid emissions in an alpine city. |
| المؤلفون: |
Kaser, Lisa, Peron, Arianna, Graus, Martin, Striednig, Marcus, Wohlfahrt, Georg, Juráň, Stanislav, Karl, Thomas |
| المصدر: |
Atmospheric Chemistry & Physics; 2022, Vol. 22 Issue 8, p5603-5618, 16p |
| مصطلحات موضوعية: |
HEAT waves (Meteorology), LEAF temperature, MONOTERPENES, TREE pruning, TERPENES, ISOPRENE, SESQUITERPENES |
| مستخلص: |
Terpenoid emissions above urban areas are a complex mix of biogenic and anthropogenic emission sources. In line with previous studies we found that summertime terpenoid fluxes in an alpine city were dominated by biogenic sources. Inter-seasonal emission measurements revealed consistency for monoterpenes and sesquiterpenes but a large difference in isoprene between the summers of 2015 and 2018. Standardized emission potentials for monoterpenes and sesquiterpenes were 0.12 nmol m -2 s -1 and 3.0×10-3 nmol m -2 s -1 in 2015 and 0.11 nmol m -2 s -1 and 3.4×10-3 nmol m -2 s -1 in 2018, respectively. Observed isoprene fluxes were almost 3 times higher in 2018 than in 2015. This factor decreased to 2.3 after standardizing isoprene fluxes to 30 ∘ C air temperature and photosynthetic active radiation (PAR) to 1000 µ mol m -2 s -1. Based on emission model parameterizations, increased leaf temperatures can explain some of these differences, but standardized isoprene emission potentials remained higher in 2018 when a heat wave persisted. These data suggest a higher variability of interannual isoprene fluxes than for other terpenes. Potential reasons for the observed differences such as emission parameterization, footprint changes, water stress conditions, and tree trimming are investigated. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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