The analyses of the AOD from the MODIS were impossible due to the cloud
coverage over the area.
Again the analyses of the back trajectories reveal that the air masses were
advected to the study area from the west and they passed the Birkenes station. With
the stable wind speed conditions the air masses passed the Birkenes station on 18/
19 July (Fig. 8).
The average AOD at 500 nm at the Birkenes station was 0.043 and the Angstrom
exponent—1.918, which indicate clear air and with presence of rather small particles. This situation is confirmed by the fine (0.042) to coarse mode ratio (0.005)
for that day. These values are one order of magnitude lower than those obtained
above the CRS station in Lubiatowo, 0.179 and 0.74, respectively, which indicate
presence of sea salt particles due to high breaking waves
3.4 21 July 2012
On 21 July 2012 the low pressure system moved towards north (Scandinavia)
and the northern Poland was under the cold front. On that day the Microtops II
measurements were made between 12:03 (UTC) and 13:46 (UTC). The average
AOD at 500 nm was 0.2 and the Ängström exponent—0.58 (Fig. 9).
The analyses of the MODIS pictures showed that the Terra instrument registered
clouds and the Aqua instrument provided AOD at 500 nm at a level of 0.2 for the
study area.
Just like on previous days the air masses were advected to the study area from the
west and they passed the Birkenes station. With the stable wind speed conditions the
air masses passed the Birkenes station on 19/20 July. The daily average AOD at
500 nm on 20 July was 0.038 and the Ängström exponent—1.814 (Fig. 10).
Fig. 7 The AOD (500 nm)
and Angstrom exponent
(440–870 nm) on 20 July
2012 at the CRS station in
Lubiatowo
Impact of Breaking Waves on Sea Salt Production …
17
coverage over the area.
Again the analyses of the back trajectories reveal that the air masses were
advected to the study area from the west and they passed the Birkenes station. With
the stable wind speed conditions the air masses passed the Birkenes station on 18/
19 July (Fig. 8).
The average AOD at 500 nm at the Birkenes station was 0.043 and the Angstrom
exponent—1.918, which indicate clear air and with presence of rather small particles. This situation is confirmed by the fine (0.042) to coarse mode ratio (0.005)
for that day. These values are one order of magnitude lower than those obtained
above the CRS station in Lubiatowo, 0.179 and 0.74, respectively, which indicate
presence of sea salt particles due to high breaking waves
3.4 21 July 2012
On 21 July 2012 the low pressure system moved towards north (Scandinavia)
and the northern Poland was under the cold front. On that day the Microtops II
measurements were made between 12:03 (UTC) and 13:46 (UTC). The average
AOD at 500 nm was 0.2 and the Ängström exponent—0.58 (Fig. 9).
The analyses of the MODIS pictures showed that the Terra instrument registered
clouds and the Aqua instrument provided AOD at 500 nm at a level of 0.2 for the
study area.
Just like on previous days the air masses were advected to the study area from the
west and they passed the Birkenes station. With the stable wind speed conditions the
air masses passed the Birkenes station on 19/20 July. The daily average AOD at
500 nm on 20 July was 0.038 and the Ängström exponent—1.814 (Fig. 10).
Fig. 7 The AOD (500 nm)
and Angstrom exponent
(440–870 nm) on 20 July
2012 at the CRS station in
Lubiatowo
Impact of Breaking Waves on Sea Salt Production …
17