The EarthCARE mission: An active view on aerosols, clouds and radiation
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1 The EarthCARE mission: An active view on aerosols, clouds and radiation T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015
2 EarthCARE is ESA s sixths Earth Explorer Mission and will be implemented in cooperation with JAXA Mission Goal: Relationship of clouds, aerosols and radiation ESA: satellite, three instruments, launch, operations JAXA: one instrument Dry launch mass about 2.2 ton EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 2
3 Heritage: A-Train Observations CloudSat Radar CALIPSO Lidar Target Classification MODIS North/mid- Atlantic EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 3
4 Mission Summary Mission Objective: Understanding of cloud-aerosol-radiation interactions so as to include them correctly and reliably in climate and NWP models Required Global Observations: Vertical profiles of natural and anthropogenic aerosols, their radiative properties and interaction with clouds. Vertical distributions of atmospheric liquid water and ice, their transport by clouds and their radiative impact. Cloud distribution ( cloud overlap ), cloud-precipitation interactions and characteristics of vertical motions within clouds. Retrieval of profiles of atmospheric radiative heating and cooling through the combination of the retrieved aerosol and cloud properties. EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 4
5 Mission Concept Needs Aerosols: Vertical profiles of extinction and characteristics of aerosols Techniques Lidar EarthCARE instruments ATLID UV & HSR Clouds: Vertical profiles of liquid, supercooled and ice water, cloud overlap, particle size and extinction Vertical motion: Convective updraft and ice fall speed Radar Doppler Radar CPR CPR with Doppler 2-D Context: Clouds and aerosols horiz. structures Multi-spectral Imager MSI Radiation and Flux: Broadband SW & TOA Broadband Radiometer EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 5 Temperature and humidity from operational analysis BBR
6 ATLID CPR emission telescopes baffles BBR MSI EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 6
7 ATmospheric LIDar ATLID Sampling Pulse repetition of 51Hz leads to horizontal sampling distance of 140m. To improve SNR, two consecutive profiles are integrated on-board, leading to actual horizontal sampling of 280m Vertical sampling: ~100m EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 7
8 Cloud Profiling Radar CPR EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 8 High power W-band (94GHz) nadirpointing Doppler capability (Doppler velocity ±10m/s, accuracy 1m/s) Antenna aperture 2.5m Variable pulse rep. freq.: Hz Sensitivity at least -35dBZ at 20km height Sampling: 500m horizontal, 100m vertical Vertical range up to 12, 16 or 20km as function of latitude. Lower vertical range higher PRF better Doppler -3dB beamwidth = 0.09 effective footprint on ground = 750m x 1000m Instrument: 321 W, 270 kg, 265 kbps Level 1 product: reflectivity & Doppler profiles
9 Multi-Spectral Imager MSI Objective: SWIR-2 radiator To provide contextual imagery information to support the retrievals of geophysical parameters by the active instruments onboard EarthCARE VNS TIR Characteristics: 150 km swath ( 35km to +115 km) 500 m ground sampling distance 57 W, 58 kg, 652 kbps Level 1 product: radiances (VNS) & brightness temperatures (TIR) VNS = visible, near-infrared, short-wave infrared TIR = thermal infrared EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 9 Channel Sun Baffle Centre Wavelength [μm] OB Bandwidth (50%) [μm] VIS NIR SWIR SWIR TIR TIR TIR
10 Broad-Band Radiometer BBR Three fixed telescopes: forward (55 ), nadir, backward (-55 ) Two channels: Short-wave (SW) channel 0.25 µm to 4 µm Total-wave (TW) channel 0.25 µm to >50 µm synthetic LW derived Abs. accuracy 2.5 (SW) / 1.5 (LW) Wm -2 sr -1 SW filter empty empty SW filter Spatial resolution 10 km x 10 km Spatial sampling distance 1 km Interface data: 48 W, 45 kg, 145 kbps Products: TOA SW/LW radiances & flux EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 10 3 fixed, single mirror telescopes, each with a linear microbolometer detector array Chopper drum rotates continuously, chopping the signal between SW, drum & TW views Calibration drum periodically rotates into view: Hot or cold blackbody, every 88s, to calibrate LW View to sun diffuser, every 2 months for 30 orbits, to monitor aging in the SW chain
11 50º 3º CPR CPR Ø<1km, nadir 500m sampling zenith EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 11
12 Payload Summary Payload & Level 1 (L1) Products: HSR Lidar: λ=355nm with depol. channel: L1: attenuated backscatter profiles 95GHz Radar with Doppler (JAXA/NICT): L1: Reflectivity and Doppler profiles Multi-spectral Imager, 4 solar + 3 TIR channels L1: TOA radiances and brightness temperatures in 7 spectral bands Broad-band Radiometer, 3 fixed FoV s L1: Filtered top-of-atmosphere radiances short- and long-wave EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 12
13 Science Data Products Advanced Retrieval Techniques Synergistic retrieval using lidar, radar and imager together. Example: North-Atlantic cloud system observed by CloudSat and CALIPSO. Left column: forwardmodelled radar reflectivity and lidar backscatter versus observed, showing successful algorithm convergence. Lidar Lidar Radar Radar Ice ext IWC Ice flux Rain rate Right column: Retrieved atmospheric constituents. Figures courtesy of Robin Hogan, VARSY Project. EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 13 Doppler Rain volume diameter IWC
14 Science Data Products ATLID Level 1 (ESA) Attenuated backscatter in Rayleigh channel Co-polar Mie channel Cross-polar Mie channel CPR Level 1 (JAXA) Radar reflectivity and Doppler profile MSI Level 1 (ESA) TOA radiances for four solar channels, TOA brightness temperatures for three thermal channels BBR Level 1 (ESA) TOA long-wave and totalwave radiances ATLID Level 2 Feature mask and target classification, extinction, backscatter & depolarisation profiles, aerosol properties, ice cloud properties,... CPR Level 2 Radar echo product, feature mask, cloud type, liquid and ice cloud properties, vertical motion, rain and snow estimates,... MSI Level 2 Cloud mask, cloud microphysical parameters, cloud top height, aerosol parameters,... BBR Level 2 Unfiltered top-of-atmosphere radiances, short-wave and long-wave fluxes Synergistic Level 2 Target classification, cloud and aerosol 2-dim. profiles shown in previous viewgraph EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 14 3-dim. Scenes Construction Expand syn. retrievals acrosstrack using MSI information Radiative Transfer Products 1D & 3D rad. transfer: radiances, fluxes, heating rates Linking clouds/aerosols and radiation Assessment Comparison of Radiative Transfer Products (radiances, fluxes) to BBR radiances and fluxes
15 Preparatory Science Activities Science Preparation Building on CloudSat, Calipso, CERES/GERB, MODIS, ground-/air-based radar/lidar, modelling, Joint Mission Advisory Group Members: Europe, Japan, Canada Observers: USA EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 15
16 Validation ESA Tentative Schedule 1. Draft EarthCARE Validation Requirements Document 2. Validation Requirements Status Review 3. Issue ESA International Validation AO L 2 yrs 4. Evaluate Val AO draft Validation Implementation Plan 5. First ESA Validation Workshop L 1½ yrs 6. Consolidate Val. Implementation Plan (incl. securing funding) 7. Start implementation 8. Pre-launch Joint ESA-JAXA Validation Workshop < L ½ yrs 9. Validation Rehearsal, Val. Readiness Review 10. Flight Acceptance Review 11. Launch 2 nd half 2018 EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 16
17 EarthCARE CloudSat / CALIPSO / MODIS / CERES: cloud-aerosol profile + radiation data record since 2007 image NASA improved cloud-aerosol profile + radiation data record /22 Cloud profiles are the key to atmospheric heating beyond EarthCARE: no follow-up mission planned end of cloud-aerosol profile data record? Community concern: What after CloudSat, CALIPSO and EarthCARE? Clouds-precip-water vapour hydrological cycle Any Cloud profiles key to atmospheric Questions? heating, not possible to quantify with passive imagers Aerosol air quality, cloud interaction NWP impact of assimilation/nwp to be studied with EarthCARE if successful, what s next? No CloudSat-CALIPSO-EarthCARE type of mission on the horizon for the 2020 s EarthCARE T. Wehr, P. Ingmann, T. Fehr Heraklion, Crete, Greece 08/06/2015 D/EOP Slide 17
The EarthCARE mission: An active view on aerosols, clouds and radiation
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