We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Comparison of ozone profiles from DIAL, MLS, and chemical transport model simulations over Río Gallegos, Argentina during the spring Antarctic vortex breakup, 2009.
- Authors
Sugita, Takafumi; Akiyoshi, Hideharu; Wolfram, Elián; Salvador, Jacobo; Ohyama, Hirofumi; Mizuno, Akira
- Abstract
This study evaluates the agreement between ozone profiles derived from the ground-based DIfferential Absorption Lidar (DIAL), satellite-borne Aura Microwave Limb Sounder (MLS), and 3-D chemical transport model simulations (MIROC-CTM) over the South Patagonian Atmospheric Observatory (OAPA, 51.6° S, 69.3° W) in Río Gallegos, Argentina from September to November 2009. In this austral spring, measurements were performed in the vicinity of the polar vortex, and inside it on some occasions; they revealed the variability in potential vorticity (PV) of measured air masses. Comparisons between DIAL and MLS were performed between 6 hPa and 100 hPa with 500 km and 24 h coincidence criteria. The results show a good agreement between DIAL and MLS with mean differences of ±0.1 ppmv (MLS - DIAL, n = 180) between 6 hPa and 56 hPa. MIROC-CTM also agrees to DIAL, with mean differences of ±0.3 ppmv (MIROC-CTM - DIAL, n = 23) between 10 hPa and 56 hPa. Both comparisons provide mean differences of 0.5 ppmv (MLS) to 0.8-0.9 ppmv (MIROC-CTM) at the 83-100 hPa levels. DIAL tends to underestimate ozone values at this lower altitude region. Between 6 hPa and 8 hPa, the MIROC-CTM ozone value is 0.4-0.6 ppmv (5-8 %) smaller than those from DIAL. Applying the scaled PV criterion for matching pairs in the DIAL/MLS comparison, the variability in the difference decreases 21-47 % between 10 hPa and 56 hPa. However, the mean differences are slight for all pressure levels, except 6 hPa. Because ground measurement sites in the Southern Hemisphere are very sparse at mid- to high-latitudes, i.e., 35-60° S, the OAPA site is unique for evaluating the bias and long-term stability of satellite instruments. The good performance of this DIAL system will be useful for such purposes in the future.
- Subjects
ATMOSPHERIC aerosols; ATMOSPHERIC ozone; DIFFERENTIAL absorption lidar
- Publication
Atmospheric Measurement Techniques Discussions, 2017, p1
- ISSN
1867-8610
- Publication type
Article
- DOI
10.5194/amt-2017-290