Imad El Haddad Paul Scherrer Institut Zurich, 30 June 2015

Transcription

1 Wir schaffen Wissen heute für morgen Emissions from combustion in a ship research engine and associated secondary organic aerosol formation potential Imad El Haddad Paul Scherrer Institut Zurich, 30 June 2015

2 Ship emissions overview Maritime transport globally important: >200 Mio Tons of fuel per year (21% of the total global fuel consumption) Substantial contribution anthropogenic PM: coastal regions up to 50%, but little is known No stringent regulations: Heavy fuel oil (): used mainly on open ocean (170 Mio. Tons) high sulfur content (limit 3.5%) Marine gas oil (): used in controlled areas/harbors (43 Mio. Tons) less viscous low sulfur content (limit 1%) 1

3 Ship emissions overview Oeder et al., PlosOne 2015 emissions: heavy metals and PAHs emissions: elemental carbon (soot) / 2

4 Ship emissions overview Oeder et al., PlosOne 2015 Decrease Increase Inflammatory signaling Oxidative stress Cell homeostasis Cellular stress Endocytosis Protein synthesis Protein degradation RNA metabolism Chromatin modification emissions: heavy metals and PAHs emissions: elemental carbon (soot) emissions: induce oxidative stress and inflammatory reactions emissions: genotoxic; affect protein synthesis and mitosis / 2

5 Ship emissions overview Sippula et al., EST, 2014 hopanes azaarenes PAHs alkanes Only a minor fraction of the organic aerosol emissions is identified 3

6 Cl Cl O Ship emissions overview Sippula et al., EST, 2014 Equilibrium partitioning (P V or C sat ) VOC POA O Cl EC (soot) Emission and atmospheric transformation CO, CO 2 3

7 Ship emissions overview Sippula et al., EST, 2014 OH SOA VOC POA OH EC (soot) Emission and atmospheric transformation OH CO, CO 2 3

8 Objectives Study emissions from ship engines run on and VOC Volatility and partitioning OH Reaction rates and atmospheric lifetimes SOA potential (possibly with health implications) SOA POA OH EC (soot) Emission and atmospheric transformation OH CO, CO 2 4

9 Emission measurements at PSI Mobile chamber Cool chamber (down to -20 C) PAM (fast aging) Biomass burning Cooking Platt et al., 2013; Bruns et al., 2014 Aircraft engines Biogenic emissions Road vehicles El Haddad et al., in prep; Klein et al., in prep Bruns et al., 2014 Platt et al., 2013, 2014; Zardini et al., 2014 Ship engines 5

10 Project overview: WOOSHI Pieber et al., in prep Queensland University of Technology 6

11 Experimental setup 1/2-4-stroke single cylinder research engine - can simulate operation of different modern engines - operated with and Setup at the University of Rostock - operated at cruising conditions (50%) 7

12 Experimental setup 2/2 10 m 3 mobile chamber with UVA lights Dilution Ship engine Online instruments Ejector Dilutor (1:10) 150 C Thermodenuder Online gas-phase instruments (CO2, CO, CH4, NOX, SO2, PTR-ToF-MS/VOC) Online aerosol-phase instruments (AMS, CHARON-PTR-ToF-MS/VOC, SMPS- APM, Aethalometer, SP2) Volatility examination (1) Dillution (2) Heat (3) Chemical composition Offline samples (Filters, sorption tubes) 7

13 Example in chamber enrichment thermodenuder tests decay due to losses to the chamber walls Reference («Bypass») in chamber dilution followed by photochemistry experiments T1 T2 T3 8

14 Response to dilution OA emission factors [g kg -1 fuel] C OA [µg m -3 ] 9

15 Response to heat dn/dlog(dp) [cm -3 ] T = 45 C T = 60 C T = 80 C Dp [nm] 10

16 Response to heat Grieshop et al. ACP % at ~60-90C 50% Similar behavior as lub-oil less volatile than 10

17 Estimated volatility and half-times C# Alkanes Log 10 (C OA ) emission factors [g kg -1 fuel] volatility distribution Log 10 (C OA ) Most of the compounds are estimated to be semi-volatile (consistent with C 20 -C 25 alkanes) 12

18 Estimated volatility and half-times C# Alkanes Log 10 (C OA ) emission factors [g kg -1 fuel] volatility distribution half life [h] Log 10 (C OA ) Log 10 (C OA ) Most of the compounds are estimated to be semi-volatile (consistent with C 20 -C 25 alkanes) At atmospherically relevant concentrations (1-10 µg/m 3 ), half-lifes shorter than 1 day 12