INUPIAQ/CLACE 2014

University of ManchesterData availability

INUPIAQ Aims• KO1. To characterise the chemical composition of IN and aerosols

upwind of JFJ and to determine whether the aerosol properties can be used to predict the number of ice nuclei at each site.

• KO2. To determine whether previously observed sharp transitions between ice and liquid clouds [Choularton et al. 2008] are due to changes in aerosol chemical composition, CCN or IN.

• KO3. To provide a comprehensive data set of aerosol, ice phase nucleation and cloud microphysics measurements which will be used for sensitivity studies in an explicit cloud–aerosol interaction model (ACPIM) for the purpose of understanding the important processes to include in other state-of-the-art models, such as the MetUM.

• KO4. To identify ice processes that impact cloud evolution significantly.

Choularton, T. W., et al., 2008: The influence of small aerosol particles on the properties of water and ice clouds. Faraday discussions, 137, 205–222.

Schilthorn appears to have the best connectivity for the CLACE 2013 experiment

• WRF model suggests Concentrations of the tracer from Schilthorn are highest when taken at the JFJ

Upwind Site

Aerosol InstrumentationInstrument Measurement Size range Time

resolution

AMS Nonrefractory compositionOrganic matter, SO4, NO3, NH4 Size distribution in polluted conditions

50 – 800nm 10min

SMPS Size distributions 10 – 600nm 5min

SP2 Black carbon number, mass concentrationLight scattering particle (LSP, ie non-BC) number concentrationBC mixing state

80 – 600nm 150-600nm

120-250nm

1min

CPC Total number concentration 20nm + 1sAPS Size distributions 0.5 – 20µm 1s

GRIMM OPC

Size distributions 0.25 – 30µm 6s

WIBS Biological particles 0.5* – 20µm 5min

Some notes

• The AMS and SP2 are corrected to standard temperature and pressure 273.15K, 1013.25mbar

• Data coverage 26 Jan – 24 Feb except for power cut on 3 Feb

• Present Weather Sensor/Metek also at Schilthorn

AMS time series4

3

2

1

0

µg/s

m3

29/01/2014 08/02/2014 18/02/2014dat

SO4 NH4 Org NO3

Sulphuricacid

Organics/Ammonium sulphate

Burgerscooking??

Ammoniumnitrate

VERYclean

Burgers?

WIBS-4• 0.5* – 20µm Size Range • Moved Between Sites • Schilthorn 26th Jan -3rd Feb• Jungfraujoch 5th Feb until

25th Feb• Varied between ISI and

Total Inlet at Jungfraujoch, generally opposite to the PSI WIBS

Cloud InstrumentationInstrument Measurement Size range Time

resolution

CAS Aerosol and Smaller Droplet Size Distributions and Number Concentrations

0.51 – 50 µm 1s

CIP Ice Size Distributions and Number Concentrations

15 – 960 µm 1s

FSSP Droplet Size Distributions and Number Concentrations

0.51 – 50 µm 1s

CDP Droplet Size Distributions and Number Concentrations

2 – 50 μm 1s

PVM Liquid Water Content 3 - 50 µm 1s2-DS/3V-CPI

Particle Size Distributions and Number Concentrations, Ice Water Content, Ice Crystal Habit

10-2300 µm

Varies

Other JFJ data and Issues

• Vaisala (Temperature and RH), Metek (Wind), Venturi (Pressure) and Rotator data also available.

• Most Data Available 19th Jan - 28th Feb• CIP data not processed – Downtime• 2DS only Processed for priority cases• Rotator in Manual before 31 Jan• Riming, Fixing Instruments, Power Outage

LiDAR Data

• 1.55μm pulsed Doppler LIDAR with a depolarisation channel

• Maximum range 10km• Both azimuthal and

elevation scanning

LiDAR Scans

• Stare at 170° azimuth (az), 21.5° elevation (el)• Velocity-Azimuth Display (VAD) scans of 10° az

steps at 19° and 35° elevations• Range Height Indicator (RHI) scans between 0-

90° el in 2.5° steps at 186°, 223° and 256° az• Wind Profiles • Cross Polarised – Phase issues.

• 30 minute cycles• Roughly 12 minutes Vertical Stare• Each other Scan takes about 2-3 minutes.• Wind Profiles Every 30 minutes• Scan Data Available between 01/02/2014 until

27/02/2014 ~0830 UTC• Other Stares (106° 29th Jan, 326° 29th- 31st Jan ) and

RHI’s (160° 29th Jan-31st) available approx. every 6 seconds

Connectivity

• Filter good periods for testing with WRF cases• Precipitable Water < 0.01 and Wind Direction

Westerly (240-300°) at Schilthorn (No Cloud)• Total CDP Concentration > 4 per cc and Wind

Direction Westerly (210-359° to allow for Orography) at Jungfraujoch

• Few good cases 8-9th Feb, 12th Feb, 14th Feb

RHI

VAD

Further Work

• Run WRF on a number of connected cases for background

• Initialise WRF with different initial aerosol parameters

• Test ACPIM parcel model with real data• To Quantify the effect of aerosols on the cloud

processes and models.