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On the Large Variation in Atmospheric CO 2 Concentration at Shangdianzi GAW Station during Two Dust Storm Events in March 2021.
- Source :
- Atmosphere; Sep2023, Vol. 14 Issue 9, p1348, 17p
- Publication Year :
- 2023
-
Abstract
- Dust storms have large impacts on air quality and meteorological elements; however, their relationships with atmospheric greenhouse gases (e.g., CO<subscript>2</subscript>) and radiation components remain uncertain. In this study, the co-variation of dust and CO<subscript>2</subscript> concentrations and its possible influencing mechanism are examined using observations at the Shangdianzi (SDZ) regional Global Atmosphere Watch (GAW) station along with simulations of the Vegetation Photosynthesis and Respiration Model coupled with the Weather Research and Forecasting model (WRF-VPRM), during two dust storm events on 15 and 28 March 2021. During these events, hourly CO<subscript>2</subscript> concentrations decreased by 40–50 ppm at SDZ while dust concentrations increased to 1240.6 and 712.4 µg m<superscript>−3</superscript>. The elevated dust increased diffusive shortwave irradiance by 50–60% and decreased direct shortwave irradiance by ~60% along with clouds. The dust events were attributed to the passages of two cold front systems over northern China. At SDZ, during the frontal passages, wind speed increased by 3–6 m s<superscript>−1</superscript>, and relative humidity decreased by 50–60%. The CO<subscript>2</subscript> variations associated with the frontal systems were captured by the WRF-VPRM despite the overestimated surface CO<subscript>2</subscript> level at SDZ. Biogenic CO<subscript>2</subscript> flux plays an indistinctive role in the large CO<subscript>2</subscript> variation at SDZ, as it is weak during the non-growing season. The cold fronts pushed polluted air southeastward over the North China Plain and replaced it with low-CO<subscript>2</subscript> air from Northwest China, leading to the decline in CO<subscript>2</subscript>. These findings demonstrate that mesoscale synoptic conditions significantly affect the regional transport and dispersion of CO<subscript>2</subscript>, which can influence the prediction of terrestrial carbon balance on a regional scale. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20734433
- Volume :
- 14
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Atmosphere
- Publication Type :
- Academic Journal
- Accession number :
- 172419031
- Full Text :
- https://doi.org/10.3390/atmos14091348