Exploring extreme solar proton events, their possible atmospheric impacts, and potential paleoclimate signatures Katharine Duderstadt, Harlan Spence, Jack.

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Presentation transcript:

Exploring extreme solar proton events, their possible atmospheric impacts, and potential paleoclimate signatures Katharine Duderstadt, Harlan Spence, Jack Dibb, Nathan Schwadron, Stanley Solomon, Charles Jackman, Cora Randall, Michael Mills, Matthew Gorby Living With a Star (LWS) Science Meeting 2-6 Nov 2014, Portland, Oregon

Image: Steele Hill / NASA SUN TO ICE Original goal: Calibrate nitrate enhancements in polar ice to unlock historic information of extreme events. Photo: Katrine Gorham Current status: Unable to calculate enough nitrate from solar proton events to account for observed nitrate spikes in ice.

Smart et al. [2006] GISP2-H Ice Core -- Summit, Greenland Carrington Event Carrington [1859]

adapted from Kepko et al. [2009] “BU” core -- Summit Greenland GLEs

What else could explain nitrate spikes in ice? ●Tropospheric sources biomass burning, pollution, dust ●Post-depositional processing wind, photolysis, migration within snow ●Dating uncertainties J.Dibb

NH 4 + (ammonium) Biomass Burning SO 4 2- (sulfate) Anthropogenic Pollution Correlations of nitrate (NO 3 - ) with NH 4 +, SO 4 2-, Na +, Ca 2+ in daily surface snow measurements at Summit, Greenland from Whole Atmosphere Community Climate Model (WACCM) study spikes not accounted for by tropospheric sources. Nov 9 SPE WACCM Dibb et al. [ 2007]

Polar Night A stable polar vortex isolates air. NO x diabatically descends over winter pole.

Vortex-averaged total odd nitrogen NO y = NO+NO 2 +NO 3 +2N 2 O 5 + HNO 3 +HO 2 NO 2 +ClONO 2 +BrONO 2 compared to the thick background pool of NO y in the lower stratosphere. SPE enhancement of total column NO y is not large enough to explain The 4-5 fold spikes in nitrate ions in snow and ice. Nov 9 SPE NO y WACCM shows a thin layer of SPE-enhanced NO y WACCM Duderstadt et al. [2014]

WACCM shows polluted plumes from North America and Europe reaching Summit during periods of nitrate enhancement.

Sep-Oct 1989 SPEs placed in a stable polar vortex winter (2004-5) 10 times Sep-Oct 1989 SPEs placed in NO y enhanced by ~10% (maximum local 20%) with Sep-Oct 1989 SPEs. NO y enhanced by 60-70% (maximum local 100%) with 10x Sep-Oct 1989 SPEs Total column NO y enhancement not sufficient to explain 4-5 fold nitrate spikes at the surface. 10%60-70% Consider Sep-Oct the largest SPE in satellite era and then multiply by 10...

NO y (mol/mol) Cumulative column NO y (molecules cm -2 ) During Oct 1989 SPE (and 10x) After 2 weeks After 6 weeks

Integral Energy Spectra (total fluences) Consider “harder” (higher proton energy) SPEs that might penetrate into the troposphere Adapted from Webber et al and Beer et al., 2012

Total energy fluence of 20 Jan 2005 SPE and 1956 GLE (estimated in WACCM by scaling Jan 2005 event to 1956 fluence.) Adapted from Webber et al and Beer et al., 2012

WACCM Several SPEs placed in stable vortex winter of (Sep/Oct 1989 SPEs begin earlier so highest Oct flux coincides with other cases)

STEREO A July 2012 SPE (“Carrington-like” SPE that missed Earth)...also placed in stable vortex winter Vortex-average NO y Jul 2012 Sep-Oct 1989 Enhanced NO y from July 2012 SPE is similar in magnitude to prior events

Tropospheric impact of hypothetical 1956x10 event (based on 20 Jan 2005 SPE flux spectra)...minimal impact on NO x WACCM

Next steps? ●What would it take (both fluence and spectrum) for an SPE to produce the necessary amount of nitrate deposited to surface (4-5 times background)? ●Would such an event be within the scope of potential solar storms (consider sun-like stars)? ●Use particle energy flux from heliospheric transport model EPREM (Energetic Particle Radiation Environment Module) as top of the atmosphere input to WACCM. ●Consider alternative proxies to nitrate...specifically including cosmogenic radionuclides such as 10 Be, 14 C, 36 Cl in WACCM.

References Beer, J., K. McCracken, and R. von Steiger (2012), Cosmogenic Radionuclides: Theory and Applications in the Terrestrial and Space Environments, 2012 edition., Springer, Heidelberg Germany; New York. Carrington, R. C. (1859), Description of a Singular Appearance seen in the Sun on September 1, 1859, Monthly Notices of the Royal Astronomical Society, 20, 13–15. Dibb, J. E., S. I. Whitlow, and M. Arsenault (2007), Seasonal variations in the soluble ion content of snow at Summit. Greenland: Constraints from three years of daily surface snow samples, Atmospheric Environment, 41(24), 5007–5019, doi: /j.atmosenv Duderstadt, K. A., J. E. Dibb, C. H. Jackman, C. E. Randall, S. C. Solomon, M. J. Mills, N. A. Schwadron, and H. E. Spence (2014), Nitrate deposition to surface snow at Summit, Greenland, following the 9 November 2000 solar proton event, J. Geophys. Res. Atmos., 119(11), 2013JD021389, doi: /2013JD Kepko, L., H. Spence, D. F. Smart, and M. A. Shea (2009a), Interhemispheric observations of impulsive nitrate enhancements associated with the four large ground-level solar cosmic ray events (1940–1950), Journal of Atmospheric and Solar-Terrestrial Physics, 71(17–18), 1840–1845, doi: /j.jastp Smart, D. F., M. A. Shea, and K. G. McCracken (2006), The Carrington event: Possible solar proton intensity–time profile, Advances in Space Research, 38(2), 215–225, doi: /j.asr Webber, W. R., P. R. Higbie, and K. G. McCracken (2007), Production of the cosmogenic isotopes 3H, 7Be, 10Be, and 36Cl in the Earth’s atmosphere by solar and galactic cosmic rays, J. Geophys. Res., 112(A10), A10106, doi: /2007JA Wolff, E. W., M. Bigler, M. a. J. Curran, J. E. Dibb, M. M. Frey, M. Legrand, and J. R. McConnell (2012), The Carrington event not observed in most ice core nitrate records, Geophys. Res. Lett., 39(8), L08503, doi: /2012GL

Acknowledgements This work was supported by NSF grant to the University of New Hampshire. We would like to acknowledge high-performance computing support from Yellowstone (ark:/85065/d7wd3xhc) provided by NCAR’s Computational and Information Systems Laboratory, sponsored by the National Science Foundation [Computational and Information Systems Laboratory, 2012; The NCAR Command Language, 2013]. The CESM project is supported by the National Science Foundation and the Office of Science (BER) of the U.S. Department of Energy. We thanks Colin Joyce at UNH for providing the July 2012 high energy extrapolations from PREDDICS.