NASA's Aqua and
Terra satellites provide daily coverage with Terra's descending overpass at approximately 10:30 local time and
Aqua's ascending overpass at approximately 13:30 local time.
Below is a list of quasi-true color images made with MODIS-Aqua
or MODIS-Terra data remapped to a map
with 250 m resolution.
Below is a list of quasi-true color images made with MODIS-Aqua or MODIS-Terra dataproduced as RGB (red-green-blue) images using MODIS bands 1, 4, 3. The 250 m and 500 m data were
remapped to a map with 250 m resolution.To see the image you need to click on the image thumbnail. That shows the image fit into your browser window. To see the full 250-m image you need to click on the + sign on that image. Images are large and may take a while to download. You can save the image locally (with right-click). The details of software used in creating these images is described here; more at http://wimsoft.com.
|Julian Day, Sensor||
|2012-08-04||217, Aqua||Accumulations visible, particularly around Gotland|
|2012-08-02||215, Aqua||Accumulations visible around Gotland|
|2012-07-27||209, Aqua||Thick surface accumulations visible in S Baltic|
|2012-07-25||207, Aqua||Thick surface accumulations visible in S Baltic|
|2012-07-24||206, Aqua||Thick surface accumulations visible in S Baltic|
|2012-07-22||204, Aqua||Surface cyanobacteria accumulations visible in many areas.|
|2012-07-15||197, Aqua||Windy weather is preventing the accumulations to develop but the bloom is still visible S of Gotland and in Hano bight.|
|2012-07-13||195, Aqua||Windy and rainy weather has mixed the accumulations away from the surface but the bloom (increased turbidity) is still visible in open Baltic|
|2012-07-09||191, Aqua||It's cloudy but blooms/accumulations visible S of Gotland|
|2012-07-08||190, Aqua||Accumulations/blooms in Southern Baltic|
|2012-07-04||186, Aqua||It's cloudy but weak cyanobacteria accumulations appearing in Northern Baltic Proper.|
|2012-07-03||185, Aqua||Cyanobacteria blooms visible but accumulations not dense due to weather.|
|2012-07-03||185, Terra||Cyanobacteria blooms visible but accumulations not appearing due to weather.|
|2012-07-02||184, Aqua||Cyanobacteria blooms visible, especially in Northern Baltic, accumulations not dense due to weather.|
|2012-07-02||184, Terra||Finally the cyanobacteria are close to pop up to the surface. The dark green colors show where the bloom is more intense. Both Northern and Southern Baltic images are clear enough to be shown.||
|2012-06-29||181, Terra||Cyanobacteria blooms are visible in Northern Baltic Proper and in Gulf of Finland but due to windy weather they don't form surface accumulations. Enhanced turbidity in the Gulf of Riga may be due to various phytoplankton.|
|2012-06-28||180, Aqua||It is cloudy but cyanobacteria blooms are visible E and N of Gotland and in the opening to the Gulf of Finland|
|2012-06-28||180, Terra||It is cloudy and hazy but cyanobacteria blooms are visible in Northern Baltic Proper north of Gotland and in the opening to the Gulf of Finland.|
|2012-06-23||175, Aqua||Due to rainy and windy weather, no significant cyanobacteria blooms but some increase evident in filaments just outside of the Gdansk Bay.|
|2012-06-22||174, Aqua||Cyanobacteria bloom evident in the Northern Baltic Proper (judging by increased turbidity) not not forming surface accumulations yet. See the mushroom-like eddy south of Hanko eddy in the opening to the Gulf of Finland.|
Cyanobacteria bloom starting NE of Gotland and in the mushroom eddy in
the opening to the Gulf of Finland.
Technical problem with NASA's LAADS website prevents making current images although data exist.
|2012-06-18||170, Aqua||Likely cyanobacteria bloom starting in the Bay of Gdansk.|
Fig. 2. Mean frequency of cyanobacteria accumulations (FCA) for July-August in the Baltic Sea. From Kahru, Elmgren et al., in preparation; revised and extended from Kahru et al .
Kahru, M., U. Horstmann, O. Rud, Satellite detection of increased cyanobacteria blooms in the Baltic Sea: Natural fluctuation or ecosystem change? Ambio, 23 (8): 469-472, 1994. PDF
Kahru, M., J.-M. Leppänen, O. Rud, Cyanobacterial blooms cause heating of the sea surface, Mar. Ecol. Prog. Ser.,101: 1-7, 1993. PDF
Kahru, M. Using satellites to monitor large-scale environmental change: A case study of cyanobacteria blooms in the Baltic Sea. In: Monitoring algal blooms: New techniques for detecting large-scale environmental change. M. Kahru and Ch. W. Brown (Eds.). 43-61, 1997. PDF
Kahru, M., J.-M. Leppänen, O.Rud, O.P. Savchuk (2000), Cyanobacteria blooms in the Gulf of Finland triggered by saltwater inflow into the Baltic Sea, Marine Ecology Progress Series, 207:13-18. PDF
Kahru, M., O. P. Savchuk, and R. Elmgren, Satellite measurements of cyanobacterial bloom frequency in the Baltic Sea: interannual and spatial variability, Mar. Ecol. Prog. Ser., 343:15-23, doi: 10.3354/meps06943, 2007. PDF