Arctas bro measurements from the omi and gome 2 satellite instruments
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ARCTAS BrO Measurements from the OMI and GOME-2 Satellite Instruments. ARC-IONS Data Workshop 7-8 January 2009 University of Toronto. Kelly Chance, Thomas Kurosu, Trevor Beck, Andreas Richter, Michel van Roozendael, William Simpson, Ross Salawitch, Tim Canty, Yuhang Wang. Introduction

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Arctas bro measurements from the omi and gome 2 satellite instruments
ARCTAS BrO Measurements from the OMI and GOME-2 Satellite Instruments

ARC-IONS Data Workshop

7-8 January 2009

University of Toronto

Kelly Chance, Thomas Kurosu, Trevor Beck, Andreas Richter, Michel van Roozendael, William Simpson, Ross Salawitch, Tim Canty, Yuhang Wang


Introduction Instruments

BrO has been measured robustly and globally from space since the first GOME measurements in 1998 (Chance, GRL 1998), +, +

  • Enhanced tropospheric BrO has long been observed over the Arctic and Antarctic ice pack in the polar spring.


OMI BrO InstrumentsTropospheric Shelf Ice

11 March 2005

  • BrO is a strong source of O3 destruction in the stratosphere and troposphere.

  • BrO is measured globally now by SCIAMACHY, GOME-2, and OMI


OMI BrO InstrumentsTropospheric Salt Lakes1st Observation from Satellite


OMI BrO InstrumentsVolcanoes …1st Observation from Satellite

Ambrym: First satellite-based BrO observation in volcanic plumes!



Best Instruments

Fitting


Fitting satellite BrO Instruments

  • Requires precise (dynamic) wavelength and slit function calibration, Ring effect correction, undersampling correction, and proper choices of reference spectra (HITRAN!)

  • Best trace gas column fitting results come from directfitting of satellite radiances


GOME BrO fitting for the FIRS-2 overflight on April 30, 1997. The integration time is 1.5s. The fitting precision is 4.2% and the RMS is 2.710-4 in optical depth. Fitting and inversion give a vertical BrO column of 9.31013 cm-2.



Salawitch less issue et al., AGU Fall 2008:

ARCTAS & ARCPAC Inorganic Bromine Measurements

 April 2008 deployment from Fairbanks, Alaska

 Scientific Focus: quantification of the relationship between OMI BrO

and the nearly complete removal of ozone in Arctic boundary layer

“Ozone Depletion Events”

 OMI BrO: New “off line” retrieval that fits 320.5 356.5 nm region

for BrO, O3, HCHO, SO2, OClO

Publicly available retrieval: fits 340.5  358.5 nmregion

for BrO, O3, HCHO, SO2, OClO, and O2-O2

New retrieval: low residuals, much higher signal to noise,

but slight correlation with surface albedo

OMI retrievals by Thomas Kurosu

GOME-2 retrievals by Trevor Beck


SAO NRT algorithm less issue




The End! less issue


Esa global ozone monitoring experiment
ESA Global Ozone Monitoring Experiment less issue

  • Nadir-viewing UV/vis/NIR

    • 240-400 nm @ 0.2 nm

    • 400-790 nm @ 0.4 nm

  • Launched April 1995

  • Footprint 320 x 40 km2

  • 10:30 am cross-equator time,

    • descending node

  • Global coverage in 3 days


SCIAMACHY less issue

  • German/Dutch/Belgian Atmospheric Spectrometer

  • 2002 launch on ESA Envisat

  • Adds (to GOME) continuous coverage to 1700 nm, plus IR bands at 2.0 m (CO2) and 2.4 m (CO, N2O)

  • Higher spatial resolution footprint than GOME (as good as 30  60 km2)

  • Adds limb scattering and limited solar occultation measurements

    • Nadir-limb subtraction improves tropospheric measurements

  • Data and validation are still in a preliminary stage


less issue 2%



GOME BrO fitting: Relative contributions absorption by atmospheric BrO (top) and the Ring effect - the inelastic, mostly rotational Raman, part of the Rayleigh scattering – (bottom).


BrO atmospheric BrO (top) and the Tropospheric Volcanoes … 1st Observation from Satellite

Ambrym Eruption: 4th February 2005, OMI Granule 02968

BrO

SO2 courtesy of Simon Carn, UMBC


  • BrO: The Future atmospheric BrO (top) and the

  • Polar spring BrO/tropospheric O3

    • Higher spatial resolution

    • Better correlation; chemistry (high latitude Hg deposition)

  • Volcanoes!

  • Salt lakes!


Flight 4 080404 fairbanks to thule

OMI Overpass atmospheric BrO (top) and the

×

Thule

Thule

Flight 4: 080404 (Fairbanks to Thule)

T. Kurosu, K. Chance, T. Beck, G. Huey, A. Weinheimer

↑ DC8 O3

DC8 Alt →

OMI Column (1013 mol/cm2)

OMI Overpass

×

DC8 Br2


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