1. OMI OMTO3 Row Anomaly Update
seasonal patterns
latitudinal variation
time evolution ( )
recent patterns in the Northern Hemisphere:
bad news and good news
Steven Lloyd
OMI US Science Team Meeting, 27 August 2015

2. The OMTO3 row anomaly is defined as a difference of more than ±5 Dobson Units from the OMTO3 total ozone value at row 15 (1-indexed) in the range of rows known to be affected by the “row anomaly” phenomenon.
However,
the row anomaly phenomenon is not constant over time, and appears to be “spreading” at both low (1-10) and high row numbers (45-60).

3. No major seasonal pattern.
Typical recent low-latitude row anomaly pattern:
rows for first half of year
rows for second half
rows 54 and 54 all the time
No major seasonal pattern.
Year:
Latitude Band: 15°S-20°S

4. Large seasonality. Hour-glass pattern.
Typical recent high-latitude row anomaly pattern:
between rows (low end) and rows (high end)
rows 54 and 54 all the time
frequent “noise” in rows 1-10
Large seasonality.
Hour-glass pattern.
Year:
Latitude Band: 55°N-60°N

5. Latitudinal Variation of the Row Anomaly
55° to 60° Latitude
35° to 40° Latitude
15° to 20° Latitude
South
North

6. Evolution of the Row Anomaly, 30°N-35°N
2007
2008
2009
2010
2011
2012
2013
2014
Evolution of the Row Anomaly, 30°N-35°N

7. 2014 Row Anomaly throughout the Northern Hemisphere
“bad news”
10°N-15°N
30°N-35°N
40°N-45°N
50°N-55°N
Increased “noise” as low as 30°N at low row numbers (1-10) and high (45-60)
55°N-60°N
60°N-65°N
65°N-70°N
70°N-75°N
2014 Row Anomaly throughout the Northern Hemisphere

8. 2014 Row Anomaly throughout the Northern Hemisphere
“good news”
10°N-15°N
30°N-35°N
40°N-45°N
50°N-55°N
Newly-emerging “safe zone” for latitudes 30°N up to 75°N at rows 10-22
55°N-60°N
60°N-65°N
65°N-70°N
70°N-75°N
2014 Row Anomaly throughout the Northern Hemisphere