[Differences of Three Methods in Determining Ozone Sensitivity in Nanjing].
Huan Jing Ke Xue
; 45(2): 635-644, 2024 Feb 08.
Article
in Zh
| MEDLINE
| ID: mdl-38471904
ABSTRACT
In recent yearsï¼ ozone ï¼O3ï¼ has become an increasingly important air pollutant in China. Identifying the sensitivity of O3 to the precursors volatile organic compounds ï¼VOCsï¼ and nitrogen oxides ï¼NOxï¼ can help make effective abatement strategies. This study compared three methods for determining O3-VOCs-NOx sensitivityï¼ simulated photochemical indicator values and sensitivity coefficients derived from a three-dimensional air quality model and an observation-based model ï¼OBMï¼ï¼ with a case study involving an O3 pollution event that occurred in Nanjing in late July 2017. The results showed that O3 sensitivity based on the photochemical indicator and sensitivity coefficients demonstrated similar spatial variations ï¼over 50% of the grid cells of Nanjing exhibiting identical O3 sensitivityï¼. Howeverï¼ sensitivity coefficients identified a larger number of areas within a transitional O3 sensitivity regimeï¼ as opposed to the VOCs- or NOx-limited regime identified by the photochemical indicator. The determination of the latter was affected by the adopted threshold values. The OBM relied on the quality of the observational data. For exampleï¼ positive biases in observed NO2 could lead to an underestimation of O3 sensitivity to NOx with the OBM. During the high pollution periodï¼ the three methods exhibited significant disparities. The photochemical indicator tended to suggest the VOCs-limited conditionï¼ whereas the OBM and sensitivity coefficients indicated the NOx-limited or transitional regimes.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
Zh
Journal:
Huan Jing Ke Xue
Year:
2024
Document type:
Article
Country of publication:
China