# Presentation: 041572

## Second Edition-April 2005

- Now includes line strength formulas and their derivation for microwave (JPL), infrared (HITRAN) and electronic transitions plus light scattering.

## Atmospheric Science from Space using Fourier Transform Spectrometry

- The meeting is on all aspects of satellite FTS's, plus balloon and airborne FTS measurements.
- When: Wed.-Fri., May 18-20, 2005
- Where: Québec City at Loews Le Concorde.
- Workshop topics are:
- 1. Retrieval Techniques,
- 2. Calibration and Validation
- 3. Spectroscopy.
- See: http://bernath.uwaterloo.ca/ASSFTS/

## The Atmospheric Chemistry Experiment (ACE): An Overview

- _Kaley Walker_, Peter Bernath, Chris Boone, Ray Nassar and Sean McLeod
- University of Waterloo
- Waterloo, Ontario
-  Canada

## ACE Satellite

## Solar Occultation (ATMOS-Heritage)

## Timeline

- Jan.		1998	Proposal to CSA
- Feb.  	2001	FTS and Imager CDR
- Mar.  	2001	MAESTRO CDR
- Jun.  	2001	Bus CDR
- Sept. 	2002	S/C integration & test
- Mar.  	2003	Instrument test (Toronto)
- May   	2003 	Final integration (DFL)
- Aug.  	2003	Launch
- Sept.	2003 	Commissioning
- Feb.	2004	Routine operations
- Mar.	2004	Arctic campaign
- Feb.	2005	Arctic campaign

## Instruments

- Infrared Fourier Transform Spectrometer operating between 2 and 13 microns with a resolution of 0.02 cm-1
- 2-channel visible/near infrared Imagers, operating at 0.525 and 1.02 microns (cf., SAGE II)
- Suntracker keeps the instruments pointed at the sun’s radiometric center.
- UV / Visible spectrometer (MAESTRO) 0.285 to 1.03 microns, resolution ~1-2 nm
- Startracker

## MAESTRO (T. McElroy)

- Dual concave grating spectrograph, 1-2 nm resolution

## MAESTRO (Flight Model)

## Optical Layout (ABB-Bomem)

## ACE-FTS (ABB-Bomem)

**ACE-FTS (ABB-Bomem)**

- Interferometer-side

- Input optics-side

## Pegasus XL Launch Vehicle (NASA)

## ACE Orbit- Global Coverage

- 650 km, 74° inclined circular orbit, RAAN 55.7°

- Latitude
- /degrees

- Jan. 1, 2004 to Dec. 29, 2004

## Global Occultation Distribution

## Excellent SNR Performance

- MCT

- InSb

## MAESTRO Spectra

## Occultation sequence

## HCl R(0) at 34 km 

## ACE Profile Retrievals (C. Boone)

- “Global fit” approach using microwindows
- First T and p based on CO2 followed by Volume Mixing Ratios (VMRs) of atmospheric constituents
- Version 1.0: sunsets Feb.-Oct. 2004, 18 molecules + T&p (H2O, O3, N2O, CO, CH4, NO, NO2, HNO3, HF, HCl, N2O5, ClONO2, CCl2F2, CCl3F, COF2, CHF2Cl, HDO, SF6 ); ~15 GRL papers submitted
- Version 2.0 (reprocessing nearly done): extended height range plus HCN, CH3Cl, OCS, CF4, C2H6, C2H2, N2
- Version 2.1: near-real time for only Arctic Jan.-Mar. 2005 (+ ClO), to be followed by version 2.2

## Temperature Retrievals-CO2

## ACE-Radiosonde Temperature Comparison (Eureka)

- Maximum difference
- 15-25 km: 1 K
- Overall:  1.8 K
- For 8 profiles – within 200 km of Eureka
- Max. mean diff. = 1.7 K
- Will be making comparisons with CHAMP, SABER and lidar measurements

## O3 Retrievals

## MAESTRO vs ACE-FTS O3 NO2

## HCl HALOE-UARS, MLS-Aura, ACE

- From MLS team

- Only ACE and HALOE measure HCl and HF

## ACE-FTS – SAGE III comparison

## ACE-FTS – POAM III comparison

## H2O MLS vs. ACE-FTS

## HNO3-HITRAN2000 vs HITRAN2004

- Fitting results for tangent height 16 km, microwindow at 868.12 cm-1.
- SS3351, HITRAN2004

## CFC-113 (CCl2FCClF2) from Space

- Dufour et al.

## Troposphere HCN-Langley and Waterloo

- Rinsland et al.

## First Spectra of Polar Mesospheric Clouds (PMCs)

## Eureka Campaign- Feb.-Mar. 2004&2005

## International ACE Partners

- USA-	NASA launched ACE and C. Rinsland (NASA-Langley) funded to help with algorithms and cal/val.
- Belgium- R. Colin (ULB) and M. DeMaziere (IASB) and co-workers supplied CMOS imager chips, spectroscopic data, cal/val and algorithms.
- France- C. Camy-Peyret (Paris) cal/val
- Japan- M. Suzuki (NASDA) cal/val

## ACE Participants:

**Mission Scientist**- Peter Bernath, University of Waterloo
**MAESTRO Principal Investigator**- Tom McElroy, MSC
**Instrument Test**- Jim Drummond, University of Toronto
**ACE Instrument Support (FTS, MAESTRO, Imagers)**- Pierre Tremblay, Université Laval- Jim Drummond, University of Toronto- David Turnbull, U.of Western Ontario
**Science Operations Center, U. of Waterloo**- Mike Butler, Manager- Chris Boone, ACE scientist - Sean McLeod, Computer Support - Kaley Walker, Cal/Val- Randall Skelton, ACE support
**Additional Canadian Univ. Participants**- Wayne F. J. Evans, Trent University- Ian Folkins, Dalhousie University - Ted Llewellyn, Univ. of Saskatchewan - Bob Lowe, Univ. of Western Ontario- Ian McDade, York Univeristy- Jack McConnell, York University- Diane Michelangeli, York University- Jim Sloan, University of Waterloo- Kim Strong, University of Toronto

**Instrument Contractor, ABB-Bomem**- Marc-Andre Soucy, Project Manager
**Bus Contractor, Bristol Aerospace**- Ian Walkty, Project Manager
**MAESTRO Contractor, EMS / MSC**- Andrew Bell, EMS, Project Manager- Tom McElroy, MSC, Project Manager
**Main International Partners****Belgium:**
- 	 - Reg Colin, Univ. Libre de Bruxelles  - P. Simon, M. De Maziere, IASB
- 	 	**France: ****- **Claude Camy-Peyret, LPMA CNRS**USA: ****-** Curtis Rinsland, NASA Langley
**Canadian Space Agency**- Glen Rumbold, ACE Manager- Randolph Shelly, Bus- Victor Wehrle, FTS and Science Team- Marie Yelle-Whitwan, MAESTRO - Dennis Ewchuk / Dan Showalter, Ground Segment