HR: 0800h
AN: A21D-0900 [Abstracts]
TI: Study of CH4 and CO Variability near St.Petersburg Russia
AU: * Makarova, M
EM: zaits@troll.phys.spbu.ru
AF: Research Institute of Physics, St. Petersburg State U., St. Petersburg, 198504
Russian Federation
AU: Poberovskii, A V
EM: pober@troll.phys.spbu.ru
AF: Research Institute of Physics, St. Petersburg State U., St. Petersburg, 198504
Russian Federation
AU: Timofeyev, Y M
EM: Yu.M.Tim@JT14934.spb.edu
AF: Research Institute of Physics, St. Petersburg State U., St. Petersburg, 198504
Russian Federation
AU: Yagovkina, S V
EM: svja@SJ8637.spb.edu
AF: Main Geophysical Observatory, Voeikov, St. Petersburg, 198504
Russian Federation
AU: Karol, I L
EM: karol@main.mgo.rssi.ru
AF: Main Geophysical Observatory, Voeikov, St. Petersburg, 198504
Russian Federation
AU: Paramonova, N N
EM: reshal@peterlink.ru
AF: Main Geophysical Observatory, Voeikov, St. Petersburg, 198504
Russian Federation
AU: Reshetnikov, A I
EM: reshal@peterlink.ru
AF: Main Geophysical Observatory, Voeikov, St. Petersburg, 198504
Russian Federation
AU: Privalov, V I
EM: reshal@peterlink.ru
AF: Main Geophysical Observatory, Voeikov, St. Petersburg, 198504
Russian Federation
AU: Lagun, V E
EM: lagun@aari.nw.ru
AF: Artic and Antarctic Research Institute, St. Petersburg State U, St. Petersburg, 198504
Russian Federation
AU: Newchurch, M J
EM: mike@nsstc.uah.edu
AF: Atmospheric Science Dept., University of Alabama in Huntsville, Huntsville, AL 35805
United States
AB:
We report spectroscopic measurements of atmospheric CH4 total column amounts (TCA) (1991-2005) and CO TCA (1995-2005) near
St. Petersburg, Russia (59.88 N, 29.83 E). The TCA retrieval algorithm is based on the optimal estimation technique resulting
in uncertainty of daily values of CH4 and CO TCA of 1-3%. Growth rates, seasonal cycles and interannual variability of CH4
and CO TCA are estimated for the periods of measurements. CH4 and CO show a distinct annual cycle with an amplitude of about
4% and 25%, respectively. The period 1999-2002 shows a significant decline of CH4 TCA for the St. Petersburg region. The
suggested reason is hot and dry summers of 1998-2002. Growth rate of CO TCA has changed from positive value
((3.5,b2.3)%/yr.) for 1995-1998 to negative ((-2.1,b1.5)%/yr.) for 1999-2002, and in 2003, the sign of the CO growth rate
has changed again. CH4 and CO TCA sufficiently depend on the air mass origin. Influence of transboundary transport of air
masses on CH4 and CO TCA is considered to identify the source regions of CH4 and CO. Enhanced CO and CH4 TCA levels are
observed for air masses originating from the sectors North Russia sector, continental Russia and the Eurasia. Europe can be
classified as moderately polluted territory. Clean air comes from the Baltic Sea, Arctic Ocean and Scandinavia. The
distribution of CO pollution levels over sectors qualitatively support the situation seen in CH4. The urban area of
Saint-Petersburg, being one of the largest industrial areas in the Northern Europe, is used as an example for demonstrating
of combined model and experimental study of the important greenhouse gas methane emission and distribution. The factors
affecting CH4 spatial distribution for the northwest region of Russia were studied on the basis of CH4 mixing ratio (MR) and
TCA measurements, air mass origin analysis and 3D regional transport model. A 3-D regional transport model was used for the
calculations of CH4 fields (MR and TCA) for the northwest region of Russia. The estimate of total CH4 emission of
Saint-Petersburg (together with industrial suburbs) is approximately 100kT/yr. Under obtained intensity of anthropogenic
emission and observed values of methane MR, contribution of Saint-Petersburg urban sources to CH4 TCA is less then 2%.
Contribution of megacity emission (under inversion conditions) to CH4 MR average 0.25 ppm (13%) and may reach 1 ppm (52%)
for extreme inversion conditions. Results of the study can be useful for climatic tendency analysis in the Northern European
region.
DE: 1640 Remote sensing (1855)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005