# Presentation: 323585

## Additional Aerosol/Cloud/Ecosystems (ACE) Concept StudiesMarch 2007M. Schoeberl & ACE/ACOB Definition Team

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

- Mission Type: NAS
- Mission Lead: GSFC
- Mission 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

- ACE

- IPCC 2007

## STM-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 |

## ACE/ACOB: Two Spacecraft Observing Geometry

- ORCA

- Cloud Radar

- Multi-beam Lidar

- Multi-angle
- multi-wavelength
- polarimeter

- Radiometers
- HF (Orange)
- LF (Purple)

- Polarimeter & Radiometers (90o)

- 90o

- 30o

- Radar (nadir)

- Lidar (30o)

- Orbit: 650 km   SS

- ORCA (120o)

**ACOB B**

**ACE/ACOB A**

## Rough 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

## ACE/ACOB Subsets

| Mission | Science Goals | Payload | Pros | Cons | WAG Cost |
| --- | --- | --- | --- | --- | --- |
| A0 | Limited aerosol processes, ocean biology | ORCA
Polarimeter | Ocean color
Good aerosol information
Some cloud information | Limited cloud processes 
Cloud aerosol interaction science weak
Cloud heights by stereo (~1-2 km - not adequate)
Aerosol heights uncertain
Not as good as A-Train | $650M |
| A1 | Limited aerosol and cloud processes | Polarimeter
Radar | A0 + some cloud information | Aerosol heights uncertain
Limited precip coverage
More limited than A-Train
No ocean color | $850M |
| A2 | Limited aerosol, cloud, precipitation processes and ocean biology | Polarimeter Radar
ORCA | A1 for clouds and aerosols 
Ocean color | Aerosol heights uncertain
Limited 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 |

## ACE/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

- Cost

- A

- B

- C

- D

- Cost vs Science

- Concepts