Solar irradiance variability on hourly to decadal scale from SCIAMACHY and its impact on middle...
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Transcript of Solar irradiance variability on hourly to decadal scale from SCIAMACHY and its impact on middle...
Solar irradiance variability on hourly to decadal scale from SCIAMACHY and its impact on middle atmospheric ozone and
ozone-climate interaction
M. Weber, H. Bovensmann, J.P. Burrows, C. von Savigny, and J. Skupin Institute of Environmental Physics, University Bremen, Bremen
Proposal submitted to DFG for funding within CAWSES (Climate and Waether of the Sun-Earth System)
Schwerpunktsprogramm
www.iup.physik.uni-bremen.de
DFG CAWSES SPP Workshop, Bornheim, 25-27 Jan 2005
SOLOZON
Overview
climate change
SCIAMACHY, GOME ...
solar irradiance
solar proxies
ozone and other trace gases
chemistry &
transport
temperature&
dynamics
solaractivity
New scientific questions
What can we learn about vis/nir spectral solar variability on short-term time scales from hours to solar rotation period?
What are suitable VIS/IR proxies for solar VIS/IR and TSI variability?
How do the solar proxies for UV and vis/NIR on hourly to monthly time scales correlate with corresponding changes in mesospheric and stratospheric ozone?
Can we detect a first sign of ozone recovery due to the turn around in the stratospheric halogen loading or is it related to changes in tropospheric forcings, dynamics, and solar forcing?
New scientific questions
What can we learn about vis/nir spectral solar variability on short-term time scales from hours to solar rotation period?
WP1: SCIAMACHY solar irradiance variability
What are suitable VIS/IR proxies for solar VIS/IR and TSI variability?
WP2: Solar activity proxy indicator from SCIAMACHY
How do the solar proxies for UV and vis/NIR on hourly to monthly time scales correlate with corresponding changes in mesospheric and stratospheric ozone?
WP3: Solar variability in ozone up to the mesopause
Can we detect a first sign of ozone recovery due to the turn around in the stratospheric halogen loading or is it related to changes in tropospheric forcings, dynamics, and solar forcing?
WP4: Ozone-climate-sun interaction
I SCIAMACHY solar irradiance variability
Sciamachy spectral range 220-2380 nm
About fifteen spectra per day (~1.5 hrs)
First routine space observation (along with SIM/SORCE) of VIS to NIR that contributes 70% to the total solar irradiance (TSI, „solar constant“) variability
Continuation of UV irradiance montoring (SBUV, SUSIM, GOME,SBUV2, SCIAMACHY,...)
Proposed work:
Investigate UV/vis/NIR irradiance variability from hourly to solar rotation period (27d)
Comparison with solar irradiance reconstruction models (SOLIVAR, PI Solanki)
Skupin et al. 2004
II Solar activity proxy indicator from SCIAMACHY
Mg II index is an excellent solar activity proxy for UV irradiance variation down to 30 nm (Viereck et al. 2001)
longterm time series starting in 1979 (SBUV/ SUSIM/ GOME)
SCIAMACHY has high senstivity (order of 10-3) for irradiance variation at visible wavelengths
Proposed work:
Search for suitable vis/NIR and TSI solar proxy
Extend and continue SCIAMACHY Mg II/Ca II index time series
Homogenisation of longterm composite Mg II index
500nm
280 nm
Skupin et al. 2004%
Update from Weber 1999
III Solar variability in ozone up to the mesopause
SCIAMACHY data source
retrieval of upper atmospheric ozone (30-65 km) using Hartley band UV wavelengths (Rohen et al. 2004)
ozone information are derived for higher altitudes (50-90 km) using the O2(
1)
dayglow emission at 1.27µm (SICMA, PI Sinnhuber)
lower stratospheric ozone, NO2,… (v. Savigny et al. 2004) and total ozone (Weber et al., 2004)
Proposed work
Study short-term variability of upper stratospheric and mesospheric ozone linked to solar proxies (up to 27d periods)
SCIAMACHY
SCIAMACHY-MIPAS V4.6.1comparison (434 profiles)
Rohen et al. 2004
IV Ozone-climate-sun interaction
What are the causes of the rapid increase in NH ozone since mid nineties?
Are recent increase in eddy heat flux (HTF, tropospheric wave forcing) part of natural variability or related to climate change?
ozone recovery due to starting decline in effective stratospheric halogen loading still premature
Proposed Work:
Extend analysis to height-resolved ozone (SBUV/
SAGE/SCIAMACHY/GOME2)
Add more years (towards solar minimum) to better disentangle solar
activity-dynamics-climate coupling in total ozone and ozonn profiles
Dhomse et al. 2005
Outlook for future work
Work in Phase 2 (Years 3 and 4):
Solar irradiance variability investigation and continuation of ozone trend
evaluation during solar minimum condition
Solar variability in high altitude backscattered limb spectra using single
scattering radiative transfer calculation for atmospheric corrections (very
short time solar variability)
implementation of UV/vis irradiance variability in our 2D and 3D chemical
transport models and scientific case studies
Combined interpretation of upper atmospheric temperatures and ozone
variability to changes in the spectral solar irradiance.
Relation to themes in CAWSES
Characterisation of variable solar forcing thru electromagnetic radiation
Solar influence on atmospheric temperature, dynamics and chemical composition
Solar activity – climate interaction
Collaborations
CAWSES Projects:
U. Langematz, Freie Universität Berlin, ProSECCO
J. Notholt, University of Bremen, SACOSAT
K. Pfeilsticker, University of Heidelberg, ABSOLAR
C. von Savigny, University of Bremen, SCIA-STOVE
S. Solanki, MPI für Sonnensystemforschung, SOLIVAR
M. Sinnhuber, University of Bremen, SICMA
Provision of updated solar proxies and írradiance variabilities
Mesospheric ozone from SCIAMACHY
Comparison to solar irradiance variability reconstruction
solar irradiance calibration
External:
NRL (Floyd), NOAA (Viereck, Puga, Weatherhead), NASA (Hilsenrath, Janz), AWI Potsdam (Rex)