Cathryn Fox, Juliet Pickering Jon Murray, Alan Last.
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1 Cathryn Fox, Juliet Pickering Jon Murray, Alan Last
2 Campaign overview Cirrus Coupled Cloud-Radiation Experiment Aims: to understand the link between cirrus microphysical properties and macrophysical radiative signatures to obtain, through collaboration, an accurate parameterisation of cirrus optical properties in global climate modelling and Numerical Weather Prediction.
3 Motivation & Background Radiative effect of cirrus = cooling/warming, depending on: altitude particle size location particle shape optical thickness particle complexity Dependence of FIR Brightness Temp on (L) cirrus optical thickness ; (R) particle effective size (Yang et al. 2003)
4 Previously WINTEX UK 2005 (Cox et al 2010) first high resolution far-infrared study of cirrus inadequate sampling of cloud and atmosphere RHUBC Alaska 2007 (N Humpage PhD 2010) CAESAR UK Cox et al. (2010)
5 Previously WINTEX UK 2005 (Cox et al 2010) RHUBC Alaska 2007 (N Humpage PhD 2010) ground-based cirrus observations, instrument intercomparison no in-situ particle measurements CAESAR UK Humpage (2010)
6 Previously WINTEX UK 2005 (Cox et al 2010) RHUBC Alaska 2007 (N Humpage PhD 2010) CAESAR UK measurements of broadband radiances particle shattering, some noise issues
7 Previously WINTEX UK 2005 (Cox et al 2010) RHUBC Alaska 2007 (N Humpage PhD 2010) CAESAR UK measurements of broadband radiances particle shattering, some noise issues No campaign dataset currently exists combining broadband radiances with accurate cloud microphysics and detailed atmospheric state measurements
8 Campaign details Radiative closure cirrus cloud-radiation experiments in northern and mid latitudes 3 campaigns: Prestwick Nov 2013 & winter 2014 Goose Bay spring 2015 Measurements: radiances μm above, below and within an extensive layer of well developed cirrus Relative Humidity (RH) and temperature profiles of column above and below cirrus ice crystal particle size distribution, habit and crystal complexity (including roughness, concavity) within cirrus layer
9 Instrumentation FAAM T & RH TAFTS (Imperial) FIR radiometer FAAM Core Cloud Probes: CIP-100, 2DC, CDP SID2/3 (Herts) Small Ice Detector Manchester Cloud Probes: 2DS, CPI SWS (Met Office) Visible/NIR radiometer Dropsondes ARIES (Met Office) MIR radiometer
10 TAFTS Tropospheric Airborne Fourier Transform Spectrometer Dual-input Martin-Puplett polarizing FTS Spectral range: cm -1 ( µm) Resolution: 0.12 cm -1 Observes both nadir and zenith radiation Scan time: 2 seconds 4 on-board calibration BBs
11 Case study - flight B818 MO cloud forecast model 1200Z SEVIRI satellite images
12 Case study - flight B818 dropsondes dropsonde T and RH profiles
13 Case study - flight B818 dropsondes radiance measurements above & below cirrus (TAFTS & ARIES)
14 Case study - flight B818 dropsondes particle sampling within cirrus (cloud probes) SID2 particle count 2DS particle images radiance measurements above & below cirrus (TAFTS & ARIES)
15 Particle Size Distribution Measured 2DC μm CIP μm 2DS μm SID μm CDP < 50 μm Composite PSDs derived from all probes, taking into account error estimates Anti-shattering tips reduce small ice error Ensemble model for ice crystals (Baran & Labonnote 2007) Measured PSD from WINTEX (Cox et al. 2010) Simulated Field et al. (2007) moment estimation parameterization Single scattering functions Ensemble model (Baran & Labonnote 2007)
16 Radiance simulation RH & T profile LBLRTM (S. Clough et al) Clear sky optical depths HITRAN spectral database Measured PSD LBLDIS (D. Turner) Single scattering properties Cirrus layer bulk scattering properties Ensemble model Measured radiances Simulated radiance spectrum
17 Summary & Looking Forward CIRCCREX provides a new cirrus dataset, with the capability to take better in-situ measurements of radiances and particle properties than any previous campaign. Current work - ongoing collation and analysis of measurements taken during 1 st campaign Instrument updates in preparation for 2 nd & 3 rd campaigns in Winter 2014 and Spring 2015
18 Questions?
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