D5.4
Name: Nowcast of the middle atmosphere on the internet:
Lead Beneficiary: PMOD-WRC
Beneficiaries involved: n/a
Due Date: project month 15, project month 36 2009
Contents |
Goal
We intend to exploit the chemistry-ionosphere-climate model (CICM) SOCOL for the nowcasting of the neutral and ionized chemical species in the middle atmosphere based on specral irradiance input input from WP 5.3. Results are in deliverable 6.5.
Requirement: Observational data from the space experiments LYRA/PROBA2 and PREMOS/PICARD
Successes
publication in preparation:
Egorova T., Rozanov E., Ozolin Y., and Schmutz W. The atmospheric effects of 2003 SPE simulated with chemistry-ionosphere-climate model SOCOL-i, in preparation for JGR, 2009.
Exceptional Discoveries
n/a
Progress so far
During the last 6 months we introduced in SOCOL-i solar proton events (SPEs) and performed several experiments. For this study we have carried out two sets of 2-month long ensemble runs (ten members in each run) for October 2003 SPEs using CICM SOCOL. The first experiment was performed with daily ionization rates due to SPEs. In the second experiment we applied a simple parameterization of NOy and HOx production instead of full ion chemistry for SPEs. For the production of NOy constituents by the protons and their associated secondary electrons it was assumed that 45% of the N atoms produced per ion pair result in the production of N(4S) (~0.55 per ion pair) and that 55% of the N atoms produced per ion pair result in the production of NO (~0.7 per ion pair) (Jackman et al., 2005). For HOx production we follow the Solomon et al. (1981) approach, where each ion pair results in the production of up to two HOx molecules in the middle atmosphere. The difference between the experiment with full ion chemistry and the parameterized NOy and HOx production, shows that using the parameterization we underestimate the effect of SPEs on NOx, HOx and ClOx species, which results in underestimation of SPEs effect on ozone by 10-15%. For some other species the parameterization of NOy production during SPEs leads to a NO underestimation by 30% , OH by > 70%, and HOCl by > 60%. More results and analysis on the effect of the solar proton event in October 2003 on atmospheric composition can be found in Egorova et al. (2009 in preparation).
List the name of the people working on this deliverable by each beneficiary involved:
PMOD/WRC: Tatiana Egorova, Eugene Rozanov, Werner Schmutz, Anna Shapiro, Alexander Shapiro
in collaboration with Manfred Vogel, Institut für 4D–Technologien, Hochschule für Technik FHNW, Windisch, Switzerland
Problem areas
launch dates of space missions PROBA2 and PICARD are delayed
Suggestions for spin-off, collaboration or improvement
n/a
