Gdańsk Bay bloom surveys, 2006 and 2011

Repeat LIF lidar surveys in the south-eastern Baltic, including a late-August 2011 cyanobacterial bloom with median chlorophyll-a near 29 µg/L

Published figures

Interpolated campaign fields, reproduced in their original published form.

Polish coast, 2006

Interpolated phytoplankton chlorophyll field mapped along the lidar track, Gdańsk Bay, Sambian coast, Polish coast, 2006
Fig. 1Chlorophyll, phytoplankton
Interpolated dissolved organic matter and oil field mapped along the lidar track, Gdańsk Bay, Sambian coast, Polish coast, 2006
Fig. 2Dissolved organic matter and oil
Interpolated seston field mapped along the lidar track, Gdańsk Bay, Sambian coast, Polish coast, 2006
Fig. 3Seston

Sambian coast, 2011

Interpolated chlorophyll a field mapped along the lidar track, Gdańsk Bay, Sambian coast, Sambian coast, 2011
Fig. 4Chlorophyll a
Interpolated CDOM field mapped along the lidar track, Gdańsk Bay, Sambian coast, Sambian coast, 2011
Fig. 5CDOM
Interpolated total suspended matter field mapped along the lidar track, Gdańsk Bay, Sambian coast, Sambian coast, 2011
Fig. 6TSM
Gdańsk BayBaltic Sea
2 km
● Baltic 2011, Sambian coast, 2011-08-2425,860 measurements IDW interpolation, 600 samples
Chl-a13.651.3µg/L
CDOM0.744.92a.u.
TSM0.9816.9mg/L

Fig. 7 Campaign measurement record. 25,860 lidar returns are plotted along the vessel track for Chl-a, CDOM, TSM. The field view applies inverse-distance weighting to the same observations; the shoreline is from Natural Earth.

LIF lidar measurements were collected in the south-eastern Baltic during a June 2006 transect through Gdańsk Bay and an August 2011 survey near the Polish and Sambian coasts. The 2011 campaign encountered a dense cyanobacterial bloom, with median chlorophyll-a near 29 µg/L.

The 2006 transect recorded background chlorophyll-a near 0.2 µg/L. Taken together, the two campaigns span more than two orders of magnitude in chlorophyll-a within the same regional water body and provide a practical check on retrieval performance under markedly different bloom conditions.