MINI-DOAS Jochen Stutz Max Spolaor University of California Los Angeles.

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Presentation transcript:

MINI-DOAS Jochen Stutz Max Spolaor University of California Los Angeles

 Identify and quantify trace gases using their narrow band absorptions.  Airborne remote sensing  Slant Column Density (SCD) What is Mini-DOAS ? Rotating Telescopes Alternating viewing directions +1˚ 0˚ -1˚ -1.5˚ -2˚ -2.5˚ -3˚ -4˚ -5˚ -15˚

How does Mini-DOAS work? PC Electronics Telescopes for UV, VIS, near-IR Spectrometers Optics Scanner Vacuum Vessel Ice-Water Insulation Spectrometer Assembly Quartz Fibers  Power consumption: 29VDC at 1.4A = 41W  Size and Weight:11.8x9.84x8.0 inches; 75pounds including 9L ice-water

Spectrometers Telescopes … on NASA’s Global Hawk Quartz fibers

Identification and quantification of trace gases by their unique narrow band absorption in the open atmosphere DOAS Differential Optical Absorption Spectroscopy

BrO and O4 data analysis BrO fit range: 345 – 360nm O4 fit range: nm nm BrO 3x10 -4 Intensity 9x10 -3 Intensity O4O4 0 0 Species to be measured & DL: NO 2 50 ppt HONO20 ppt BrO 0.75 ppt HCHO150 ppt SO ppt glyoxal: ? aerosol extinction (via O 4 )

Altitude [10 3 m] ATTREX Data Example Relative Radiance [counts/ms*scans] BrO DSCD [10 14 molec./cm 2 ] Universal Time [5 th November 2011] +1˚ 0˚ -1˚ -1.5˚ -2˚ -2.5˚ -3˚ -4˚ -5˚ -15˚ Elevation Angle O4 DSCD [10 43 molec 2./cm 5 ]

From SCDs to trace gas concentration  BAMFs derived via radiative transfer calculations  Optimal Estimation Inversion to derive concentration profile c(h) VCD SCD Scattered sunlight

BrO vertical concentration profile retrieval BrO at flight altitude: ~(1.8 ± 0.25) x10 7 molec/cm3 = (5.0 ± 0.75) ppt flight level Modeled SCDs fit well SZA=74° SZA=56° Science flight 2 on 11/05, 18:00 UTC x1E14 Retrieved BrO profile

BrO vertical profiles Consecutively retrieved BrO profiles BrO at flight altitude Science flight 2 on 11/05 34°N30°N

Questions / Issues  Telescope fairing (pressure seal).  Calibration of telescope geometry after installation  Meeting NSF specs for instrument  Instrument has undergone environmental testing at NASA  Fast information on pitch, roll, acceleration ?  Addition of sensor to instrument of from aircraft?  Data archive on C130 server (~5000 spectra each 10kbyte)?  Change of measurement strategy depending on flight status  Profiling through elevation scanning vs limb during ascent/decent