Goddard Space

Flight Center

Additional Aerosol/Cloud/Ecosystems (ACE)Additional Aerosol/Cloud/Ecosystems (ACE) Concept Studies Concept Studies

March 2007March 2007

M. Schoeberl & ACE/ACOB Definition TeamM. Schoeberl & ACE/ACOB Definition Team

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Goddard Space

Flight Center

(Mission Name) Aerosol/Cloud/Ecosystems (ACE)(Mission Name) Aerosol/Cloud/Ecosystems (ACE)

Mission Type: NASMission Lead: GSFCMission Goals:

Aerosol impact on clouds and precip Ocean biology

Notional Payload (dual spacecraft) Polarimeter Ocean color spectrometer Multi-beam and/or HSRL lidar Dual frequency Radar Low frq µ wave radiometer* High freq µ wave radiometer*

Status White paper HQ Report, presentation

Science team leads Schoeberl, Remer, McClain, Kahn

Cost: $1.6 B LRD: 2015

* Optional instruments desired by the Science Team

ACEACE

IPCC 2007

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Goddard Space

Flight CenterSTM-based ACE/ACOB Instrument RequirementSTM-based ACE/ACOB Instrument Requirement

Science Requirement Instrument Type Mission

Characterization of aerosols types and modal distribution over a broad swath

Multi-angle, multi-band polarimeter

ACE/ACOB

Altitude of and properties of aerosols/clouds

Backscatter multi-beam /HSRL lidar (active)

ACE/ACOB

Cloud microphysics within the cloud Dual frequency cloud radar (active)

ACE/ACOB

Ocean color Multi-band spectroradiometer

ACE/ACOB

Cloud height in the IR IR stereo sensor ACE/ACOB

Cloud particle type and ice water path over a broad swath

High frequency µ-wave radiometer

ACOB

Precipitation and liquid water path over a broad swath

Low frequency µ-wave radiometer

ACOB

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Goddard Space

Flight CenterACE/ACOB: Two Spacecraft Observing GeometryACE/ACOB: Two Spacecraft Observing Geometry

ORCAORCA

Cloud RadarCloud Radar

Multi-beam LidarMulti-beam Lidar

Multi-anglemulti-wavelength

polarimeter

Multi-anglemulti-wavelength

polarimeter

RadiometersHF (Orange)LF (Purple)

RadiometersHF (Orange)LF (Purple)

Polarimeter & Radiometers (90º)

90º

30º

Radar (nadir)

Lidar (30º)

Orbit: 650 km SS

ORCA (120º)

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ACOB B

ACE/ACOB A

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Goddard Space

Flight CenterRough Costing of ACOBRough Costing of ACOB

Costs only include instruments to add-on to ACE B GMI ~ $20M SIRICE Radiometer ~$40M

• Add contingency $18 M• Add science team $10 M

Total $88 M

ACOB/ACE A = $1,385 M ACOB B = $242 M + $88 M = $330 M

Total ACOB cost = $1,715 M

Adding the microwave instruments adds about 5.5% to the cost of ACE but increases its scientific capability significantly

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Goddard Space

Flight CenterACE/ACOB SubsetsACE/ACOB Subsets

Mission Science Goals Payload Pros Cons WAG Cost

A0 Limited aerosol processes, ocean biology

ORCA

Polarimeter

Ocean colorGood aerosol informationSome cloud information

Limited cloud processes Cloud aerosol interaction science weakCloud heights by stereo (~1-2 km - not adequate)Aerosol heights uncertainNot as good as A-Train

$650M

A1 Limited aerosol and cloud processes

Polarimeter

Radar

A0 + some cloud information

Aerosol heights uncertainLimited precip coverageMore limited than A-TrainNo ocean color

$850M

A2 Limited aerosol, cloud, precipitation processes and ocean biology

Polarimeter Radar

ORCA

A1 for clouds and aerosols Ocean color

Aerosol heights uncertainLimited precip coverage

Not as good as A-Train

$1B

A3 Aerosol, cloud, & limited precipitation processes

Calipso lidar Polarimeter Radar

A1 + aerosol properties and aerosol heights

Limited precip coverage Same as A-Train

No ocean color

$ 1.2B

ACE Aerosol, cloud, & limited precipitation processes and ocean biology

MB/HSRL lidar Polarimeter

Radar

ORCA

Nearly full science Lacks wide swath cloud/precip coverage of ACOB

$1.6 B

ACOB Aerosol, cloud & precipitation processes and ocean biology

MB lidar Polarimeter

Radar

ORCA

Radiometers

Full science none $ 1.7B

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Goddard Space

Flight CenterACE/ACOB Phase IIACE/ACOB Phase II

Need to drive cost down without significant science loss

Trade space options Trade coverage vs orbit altitude (lower

altitude vs repeat time) OSSE’s for aerosol science goals Look at RSDO bus, co-manifest launch Need to do a IMDC/TeamX for

radar/radiometer platform Instruments

Combine ORCA and Polarimeters Combine HSRL and Multibeam Add an ERB or improved IR instrument Refine concept studies for:

Radar HSRL & Multibeam lidars Polarimeters Radiometers

Science Return

Cos

t

A

B

C

D

Cost vs Science

Concepts