Modelling and Measurements of the interactions between aerosols and clouds during ACTIVE P. Connolly , G. Vaughan , K. Bower , T. W. Choularton , M.

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Presentation transcript:

Modelling and Measurements of the interactions between aerosols and clouds during ACTIVE P. Connolly , G. Vaughan , K. Bower , T. W. Choularton , M. W. Gallagher , M. Flynn , G. Allen . A.Heymsfield, A. Bansemer.  School of Earth,Atmospheric and Environmental Sciences, The University of Manchester. NCAR, USA

Campaign 1 13 ED1415 ED16ED GF D GF D GF 24 D E28 D F 29 GF 30ED GF(2) 1 ED23 E 4 ED5 ED GF 6 E78 E9 E10 E Test Survey Hector Mixed survey/Hector Nov Dec Single- cellular Hector Multi-cellular Hector Mini-monsoon This study

Campaign 2 Jan D20ED21 22ED T 23 E T 2425 ED PT 26 D27 ED PT D31 E1 ED2 D3 ED4 56 ED PT 78 ED T 9 D T 10ED PT ED PT 13 E14 ED15 E1617Feb Test Survey Hector Monsoon Aged anvil Lidar Single- cellular Hector Multi-cellular Hector Westerly Monsoon Monsoon trough Inactive Monsoon This study

Summary Around 30 flights with each aircraft in and around tropical convection Inflow conditions change from polluted early in November (smoke from biomass burning) to very clean in Jan/Feb Hectors observed in polluted and clean regimes Monsoon convection observed in the second half of January

Question Can we observe the thermodynamic indirect effect? AND How important is it?

LEM Model framework Island heat fluxes and roughness length - MODIS. Droplet activation – Twomey 1959: N=Cs k –Maritime: C=240cm -3, Continental: C=720cm moment bulk microphysical scheme. 3-moment graupel scheme-density of graupel. Radiation code – LW, SW. Large eddy model

Heterogeneous freezing of rain Bigg 1953 Important to predict number of activated droplets and raindrops

Ice Mass for CB Drop Number = 120 cm -3

Ice Number for CB Drop Number = 120 cm -3

Ice Mass for CB Drop Number = 360 cm -3

Ice Number for CB Drop Number = 360 cm -3

Two Hectors… Mid-level dry layer: A feature of tropical easterlies (subsidence) Data – Peter May

6 Feb clean Satellite data from BoM, aircraft tracks by G. Allen

Rapid latent heat release (freezing of rain, riming) Slower latent heat release (growth of liquid by condensation)

Strong effect when no dry layer

16 Nov polluted Satellite data from BoM, aircraft tracks by G. Allen :00

No strong indirect effect when Dry layers are present

16 Nov (polluted)

6 Feb (clean)

Conclusion Two case studies are consistent with high aerosol concentrations pre-monsoon and low post monsoon. The thermodynamic indirect effect is strongly dependent on the dryness of the sounding below the melting level. For deep convective clouds, the presence of rain above the freezing level is vital to the indirect effects. It is vital to accurately predict the droplet number concentration in order to ascertain these effects.

Egrett payload Basic Meteorology and positionPressure, temperature, wind (1 Hz), GPS DMT Single Particle Soot Photometer (SP-2) † Aerosol particle size distribution (0.2 – 1.0 µ m), light absorbing fraction (LAP), carbon mass, metal 2 x TSI-3010 Condensation Particle Counter (CPC)Total condensation particles > 40 nm & > 80 nm DMT Cloud, Aerosol & Precipitation Spectrometer (CAPS)Cloud Droplet psd, aerosol/small particle assymetry, aerosol refractive index,large ice psd, (0.3<D p <3,200 µ m), Total Liquid Water Content DMT Cloud Droplet Probe (CDP) Particle Size Distribution (2< D p <60 µ m) SPEC Cloud Particle Imager CPI-230 Cloud particle/ice CCD images, (30 < D p < 2,300 µ m) Buck Research CR-2 frost point hygrometer Temperature, dew/ice point, 20 s,  0.1  2X Tunable diode laser Hygrometer (SpectraSensors) Water vapour, 2 Hz,  ppmv precision Julich CO analyserHigh precision (± 2 ppb), fast response (10 Hz) CO Cambridge Miniature Gas-Chromatograph Halocarbons (Cl, Br, I), 3-6 min,  5% TE-49C UV Ozone sensorOzone concentration (± 1 ppbv, 10 seconds) Adsorbent tube carbon trapC4-C9 aliphatics, acetone, monoterpenes NO and NO 2 chemiluminescent detector †  Hz;  30 4 s integration † alternates Aerosol Humidity Cloud Physics Chemistry Met/Position

Dornier payload Basic meteorologyAventech probeARSF/Manchester Position/TimingGPSARSF Aerosol Mass SpectrometerAerosol compositionn, 30 – 2000 nmManchester Condensation particle counterAerosol concentration > 10 nmManchester Grimm Optical Particle CounterAerosol size distribution, 0.5 – 20 μmManchester Ultra high sensitivity aerosol spectrometer Aerosol size distribution 50 nm – 0.8 µm Manchester Aerosol spectrometer probeAerosol size dist n, 0.1 – 1 µmManchester FSSPAerosol, size ( µm)Manchester FiltersCoarse aerosol compositionManchester OzoneUV absorption, 2BYork COAL5003York VOCAdsorbent tubesYork NO/NO x Chemiluminescence/catalysisYork HalocarbonsDIRAC gas chromatographCambridge Black CarbonPSAPDLR Aerosol Chemistry Met/Position

Modelling mixed phase clouds Down-draft Ascending cloud layers Lagrangian tracking of precipitation EMM T 1, P 1 T 2, P 2 Parcel model – detailed sectional microphysics CRM – Bulk 2-moment microphysics. Explicit ice density. Broad-band radiation module. Eulerian grid.