Drought impacts on PM and Ozone in the US 5 May 2015 Yuxuan Wang 1,2, Yuanyu Xie 2 1 Texas A&M University 2 Tsinghua University.

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Presentation transcript:

Drought impacts on PM and Ozone in the US 5 May 2015 Yuxuan Wang 1,2, Yuanyu Xie 2 1 Texas A&M University 2 Tsinghua University

Drought: Extreme Climate Events 2 Higher temperaturesLower precipitation Drought Ecosystems: water deficit, heat stress People: heat stress, water scarcity Air Quality? Land surface change Drought affects both society and the natural environment, including the atmosphere, water cycle, and land biosphere.

PM 2.5 during the 2011 Southern US drought NCDC drought conditions Jun 2011 PM 2.5 change: June 2011 (drought) vs. June 2010 (normal month) Observation: 114 surface sites (IMPROVE, EPA) Model: GEOS-Chem, 0.5 o x0.667 o nested-grid Temperature change (K)precipitation change (mm/month) June 2011 – June o K

PM 2.5 during the 2011 Southern US drought PM 2.5 difference (%): June 2011 (drought) minus June 2010 (normal) TX : 10.7% less (-1.16 μg/m 3 ) (p < 0.10) Southern US: +26% increase (2.3 μg/m 3 ) during drought (p < ) Observation: 114 monitoring sites Model: GEOS-Chem, 0.5 o x0.667 o PM 2.5 response to drought differs by region Observation Model

Different process involved by species and by region 5 Wang Y et al., 2015 Drought-driven change in sources and chemistry dominate over that in deposition Southern US: PM increase driven by OC TX: PM decrease driven by sulfate OC SOA diff by BVOCOC diff by fires S SSS Sulfate production diff Cloud fraction diff

Drought effects on O 3 air quality 6 Correlation between O 3 (detrended) and drought indices (PDSI, SPEI) Texas O3O3 PDSI SPEI ( R = -0.4) GC Ozone SPEI SPEI

Summary Effects of drought on PM differ by species and region 2011 drought: +26% of PM 2.5 over SUS, but -11% in Texas O 3 is higher during droughts, while the magnitude of the enhancement does not correspond to drought severity on a local scale Drought impacts on air quality/public health are significant and need to be considered on top of other ‘direct’ impacts of drought GEOS-Chem has some ability to reproduce the regionally and species-specific impacts of drought on O 3 and PM Wang Yuxuan, Xie Yuanyu, et al., Impact of the 2011 southern US drought on ground-level fine aerosol concentration in summertime, J. Atmos. Sci., 72, 1075–1093, 2015