NILUs experimental activities in AerOzClim Module 3

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NILUs experimental activities in AerOzClim -
Module 3

• Geir Braathen, Kåre Edvardsen, Georg Hansen,
  Britt Ann Kåstad Høiskar, Kerstin Stebel,
  Kjersti Karlsen Tørnkvist, Aasmund Fahre Vik

Continuation of the activities in COZUV new
activity on stratospheric water
vapour (observations data analysis)
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Stratospheric ozone lidar at ALOMAR (Andøya,
69.3ºN, 16.0ºE, 379 m a.s.l.)

Xe-Cl laser
Control room
Detector
Raman cell
Telescope
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Maximum altitude of the daylight-ozone profiles
36 km (optimal conditions 42 km), about 2 hour
averages Night-time 50 km altitude (typical 1
hour averages)
Ozone density profile from a. April 30, 2002,
10.26 - 13.04 UT (solar elevation 35-30) left,
b. May 23, 2002, 15.17 - 20.42 UT (solar
elevation 28-4) middle, c. October 30, 2002,
20.23 - 22.39 UT (night time system) right
panel.
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Total ozone at ALOMAR 2002/03
Total ozone column at the ALOMAR facility in
2002/03 from ozone DIAL, from a multi-channel UV
filter instrument (GUV) which is part of the
Norwegian ozone and UV monitoring network, and
from GOME with the TM3-DAM operational
assimilation model of the Royal Netherlands
Meteorological Institute (KNMI), available via
Internet.  
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Ozone DIAL measurements in 2003
d daytime, n night-time measurement, ozone
profile available
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Present status, future plans

• May 2002
• change of lidar geometry from biaxial to a
  coaxial mono-static configuration. Should be
  possible to observe down to approx. 5 km.
• ? upper tropospheric ozone/cirrus
  measurements
• Re-alignment problems
• Measurements are carried out whenever possible
  (weather permitting)

Data will be used forsatellite and model
validation
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UV-visible spectrometers at Andøya (69N, 16E)

• SYMOCS-VIS
• 405-555 nm
• grating 600 g/mm
• sampling ratio 6
• spectral resolution 0.9 nm
• cooled PDA detector (1024 pixels)
• O3, NO2 and IO

• SYMOCS-UV
• 335-410 nm
• grating 1200 g/mm
• sampling ratio 10
• spectral resolution 0.5 nm
• cooled CCD detector (1340x100 pixels)
• BrO and OClO

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Status of instrumentation

• In operation since 1998.
• SYMOCS-VIS has measured continuously in 2002.
  This continues in year 2003.
• The detector of the SYMOCS-UV instrument broke
  down July 2002. This was replaced Feb. 2003
  together with acquisition software, and has run
  since then.
• Both instruments participated in the NDSC
  Intercomparison campaign that took place at
  Andøya Rocket Range Feb./March this year. Aim is
  to obtain NDSC certification.
• FUTURE Continue measurements at Andøya for the
  monitoring of stratospheric ozone and related
  species and for satellite and model validation
  purposes.
• Link to EU project QUILT (Quantification and
  Interpretation of Long-Term UV-Visible
  Observations of the Stratosphere)

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SAOZ System for analysis of observations at
zenith
Ny-Ålesund 79N, 12E
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SAOZ - viewing geometry

• Ground-based spectrometer that measures sunlight
  scattered at zenith
• Analysis DOAS(Differential Optical Absorption
  Spectroscopy)
• Vertical columns of ozone and NO2 are obtained

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SAOZ measurements at Ny-Ålesund (79N,12E)

• 1990 1993 spring and autumn
• 1994 spring
• 1995 spring and autumn
• 1996 spring
• 1997 2003 spring and autumn
• spring ca. 20 February - 1 May
• autumn ca. 20 August - 1 November
• Future plans Full re-analysis of the ozone and
  NO2 data
• Use data for satellite and model validation
• Link to EU project QUILT

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UT/LS water vapour

• 2 ppmv increase in strat. H2O since mid 1950s
  (approx. 1/year)
• Increased strat. H2O will contribute to surface
  warming and strat. cooling
• Increased strat. H2O will lead to increased
  occurrence of PSCs
• H2O is important chemically as a source of OH

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UT/LS water vapour

• Need for long-term measurements of stratospheric
  water vapour. Only one long-term site in the
  world.
• Still investigating type of sonde to use
• One possibility is the SAW sonde developed at
  UCAM
• Planned measurement site Andøya
• Plan to participate in Jan-Feb 2004 water vapour
  sonde intercomp. in Sodankylä
• Snow White
• NOAA FP hygrometer
• CAO Flash (Lyman-?) hygrometer
• Lindenberg FN sonde
• Vaisala Humicap
• Intercomparison between measured and modelled H2O

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Ozonesonde observations

• Ozonesonde observations from Ørland
• Match campaigns (EU project QUOBI)
• Envisat Cal-Val
• Regular soundings
• 12 soundings carried out in Jan.-Mar. 2003
• Ozone loss obtained from sondes will be compared
  to CTM-2 ozone loss calculations