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kourtidi@env.duth.gr argeo r @env.duth.gr

DUTH aerosol-cloud presentation at MarcoPolo final meeting Beijing, China, 28 February 2017. Task 5.4: Relationship between air pollution and meteorology. Kostas Kourtidis, Aris Georgoulias *, Stavros Stathopoulos.

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kourtidi@env.duth.gr argeo r @env.duth.gr

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  1. DUTH aerosol-cloud presentation at MarcoPolo final meeting Beijing, China, 28 February 2017 Task 5.4: Relationship between air pollution and meteorology Kostas Kourtidis, Aris Georgoulias*, Stavros Stathopoulos Democritus University of Thrace (DUTH), Department of Environmental Engineering, Laboratory of Atmospheric Pollution and Pollution Control Engineering of Atmospheric Pollutants, Xanthi, Greece kourtidi@env.duth.gr argeor@env.duth.gr WP5: Air quality assessment and forecasting MarcoPolo Final Meeting, 28 February 2017

  2. DUTH aerosol-cloud presentation at MarcoPolo final meeting Beijing, China, 28 February 2017 Task 5.4 (DUTH) From MarcoPolo Technical Annex: “…quantify the impact of aerosols on cloudiness for different regions of China…” Urban clusters of China: Beijing-Tianjin-Hebei (BTH), Yangtze River Delta (YRD), Pearl River Delta (PRD) • Selection criteria: • Intensive urbanization • Spectacular population growth over the last 20 years • Extend over hundreds of kilometers • Representative of 3 different climatic regions Natural labs 20/12/2019 MarcoPolo Final Meeting, 28 February 2017 2

  3. DUTH aerosol-cloud presentation at MarcoPolo final meeting Beijing, China, 28 February 2017 Task 5.4 (DUTH) Song et al., ERL, 6(3), 034025, 2011 Kourtidis et al., ACP, 15, 10955-10964, 2015 20/12/2019 MarcoPolo Final Meeting, 28 February 2017 3

  4. DUTH aerosol-cloud presentation at MarcoPolo final meeting Beijing, China, 28 February 2017 Datasets Col. 51 MODIS/Terra and Aqua aerosol and cloud optical properties (2003-2013) • Aerosol Optical Depth at 550nm (AOD550 or just AOD) → proxy for aerosol conc. • Cloud Cover (CC) • Cloud Top Pressure (CTP) in hPa → proxy for vertical development of clouds • Cloud Optical Depth (COD) → proxy for vertical development of clouds • Water vapor (WV) column for clear-sky conditions in cm NCEP/NCAR reanalysis data • Sea Level Pressure (SLP) in hPa → proxy for synoptic meteorological conditions (SLP<1008hPa: low pressure systems vs SLP>1017hPa: high pressure systems) 20/12/2019 MarcoPolo Final Meeting, 28 February 2017 4

  5. DUTH aerosol-cloud presentation at MarcoPolo final meeting Beijing, China, 28 February 2017 AOD-WV-CC & AOD-WV-CTP relations BTH YRD PRD Kourtidis et al., ACP, 15, 10955-10964, 2015 Two upper rows: SLP<1008hPa (i.e. low pressure systems) Two lower rows: SLP>1017hPa (i.e. high pressure systems) • Over all urban clusters, for all SLP regimes, CC is found to increase with AOD → the CC dependence on AOD cannot be explained only by synoptic covariation 20/12/2019 MarcoPolo Final Meeting, 28 February 2017 5

  6. DUTH aerosol-cloud presentation at MarcoPolo final meeting Beijing, China, 28 February 2017 AOD-WV-CC & AOD-WV-CTP relations BTH YRD PRD Kourtidis et al., ACP, 15, 10955-10964, 2015 Two upper rows: SLP<1008hPa (i.e. low pressure systems) Two lower rows: SLP>1017hPa (i.e. high pressure systems) • WV is found to have a stronger impact on CC than AOD • This impact is more pronounced at high aerosol load than at low aerosol load 20/12/2019 MarcoPolo Final Meeting, 28 February 2017 6

  7. DUTH aerosol-cloud presentation at MarcoPolo final meeting Beijing, China, 28 February 2017 AOD-WV-CC & AOD-WV-CTP relations SLP<1008hPa SLP>1017hPa BTH YRD PRD Kourtidis et al., ACP, 15, 10955-10964, 2015 • Satellite-based studies will greatly overestimate/underestimate the AOD impact on CC in regions where AOD and WV have similar/opposite seasonal variations • WV impact on AOD-CC relationships shows that the hydrological cycle interferes with the aerosol climatic impact → we need to improve our understanding! 20/12/2019 MarcoPolo Final Meeting, 28 February 2017 7

  8. DUTH aerosol-cloud presentation at MarcoPolo final meeting Beijing, China, 28 February 2017 AOD-WV-CC & AOD-WV-CTP relations BTH YRD PRD Kourtidis et al., ACP, 15, 10955-10964, 2015 Two upper rows: SLP<1008hPa (i.e. low pressure systems) Two lower rows: SLP>1017hPa (i.e. high pressure systems) • CTP at low SLP regimes decreases more with AOD over PRD and much less so over the YRD urban cluster, while there is no significant impact by AOD over BTH 20/12/2019 MarcoPolo Final Meeting, 28 February 2017 8

  9. DUTH aerosol-cloud presentation at MarcoPolo final meeting Beijing, China, 28 February 2017 AOD-WV-CC & AOD-WV-CTP relations BTH YRD PRD Kourtidis et al., ACP, 15, 10955-10964, 2015 Two upper rows: SLP<1008hPa (i.e. low pressure systems) Two lower rows: SLP>1017hPa (i.e. high pressure systems) • At high SLP regimes, AOD does not seem to impact CTP significantly • Over BTH and YRD, CTP is found to increase considerably with WV only at low SLPs 20/12/2019 MarcoPolo Final Meeting, 28 February 2017 9

  10. DUTH aerosol-cloud presentation at MarcoPolo final meeting Beijing, China, 28 February 2017 AOD-WV-CTP-CC & AOD-WV-CTP-COD relations (BTH) Stathopoulos et al., Atmos Res, 183, 191-201,2017 20/12/2019 MarcoPolo Final Meeting, 28 February 2017 10

  11. DUTH aerosol-cloud presentation at MarcoPolo final meeting Beijing, China, 28 February 2017 AOD-WV-CTP-CC & AOD-WV-CTP-COD relations • Over all regions and for all seasons, CC is found to increase with increasing AOD, WV and cloud height • Aerosols, at low WV environments and under constant CTP, have less impact on CC than at high WV environments • AOD has a varying influence on COD depending on CTP • COD is found to increase with height for low and middle height clouds, and with increasing AOD, especially at low AODs • Our results demonstrate that the role of WV in the observed satellite-based aerosol-cloud relations is significant for all cloud heights 20/12/2019 MarcoPolo Final Meeting, 28 February 2017 11

  12. DUTH emissions presentation at MarcoPolo final meeting Beijing, China, 28 February 2017 Related publications so far • Journals • Stathopoulos S., Georgoulias A.K., Kourtidis K., Space-borne observations of aerosol - cloud relations for cloud systems of different heights, Atmospheric Research, 183, 191-201, doi:10.1016/j.atmosres.2016.09.005, 2017. • Kourtidis K., Stathopoulos S., Georgoulias A.K., Alexandri, G., Rapsomanikis, S., A study of the impact of synoptic weather conditions and water vapor on aerosol-cloud relationships over major urban clusters of China, Atmospheric Chemistry and Physics Discussions, 15, 14007-14026, doi:10.5194/acpd-15-14007-2015, 2015. • Books • Stathopoulos S., Georgoulias A.K., Kourtidis K., Aerosol-Cloud Relations for Cloud Systems of Different Heights, In: Perspectives on Atmospheric Sciences, Proceedings of the 13th International Conference on Meteorology, Climatology and Atmospheric Physics, Thessaloniki, Greece, 19-21 September, 2016, Karacostas T., Bais A. and Nastos P.T. (Eds.), Springer Atmospheric sciences, Springer International Publishing AG, Cham, Switzerland, 769-774, 2017. Many thanks for your attention! 20/12/2019 MarcoPolo Final Meeting, 28 February 2017 12

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