east sea -- thermal/bio-optical relationships
DESCRIPTION
East Sea -- Thermal/Bio-Optical Relationships. Define region of interest Extract ROI pixels from SST (AVHRR) and chlorophyll (SeaWiFS) imagery - daily scenes and monthly composites Examine thermal/bio-optical relationships (scatter plots, image overlays) - PowerPoint PPT PresentationTRANSCRIPT
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East Sea -- Thermal/Bio-Optical Relationships
• Define region of interest
• Extract ROI pixels from SST (AVHRR) and chlorophyll (SeaWiFS) imagery - daily scenes and monthly composites
• Examine thermal/bio-optical relationships (scatter plots, image overlays)
• Examine temporal and spatial changes (time-series analysis, histograms)
North Basin
Subpolar Front
South Basin
KoreanCoast
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North Basin -- May 21, 1999
CHL
SST
AVHRR and SeaWiFSCollected ~ 6 hrs apart
CHL > 2.0 g/l
SST
CHL > 2.0 g/l Chlo
rophyll
SST
SST Chlo
rophyll
SST
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Subpolar Front -- May 21, 1999
CHL
SST
CHL > 2.0 g/l
SST
AVHRR and SeaWiFSCollected ~ 6 hrs apart
Chlo
rophyll
Chlo
rophyll
SST
SST
CHL > 2.0 g/l
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South Basin -- May 21, 1999
CHL
SST
CHL > 2.0 g/l
SST
AVHRR and SeaWiFSCollected ~ 6 hrs apart
Chlo
rophyll
Chlo
rophyll
SST
SST
CHL > 2.0 g/l
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Korean Coast -- May 21, 1999
CHL SST SST SST
Chlo
rophyll
SST SST SST
CHL > 2.0 g/l
CHL > 2.0 g/l
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Subpolar Front -- April, May, June, 1999
April 21, 1999CHL > 2.0 g/l
SST
May 21, 1999
June 9, 1999
CHL > 2.0 g/l
Chlo
rophyll
SST
Chlo
rophyll
SST
Chlo
rophyll
SST
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Subpolar Front
Chlorophyll SST4/21/99
8.0 - 10.0
5/21/9911.5 - 13.5
6/09/9914.0 - 16.0
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SeaWiFS Monthly Chlorophyll Composite -- April 1999
0 5.0
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SeaWiFS Monthly Chlorophyll Composite -- May 1999
0 5.0
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SeaWiFS Monthly Chlorophyll Composite -- June 1999
0 5.0
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SeaWiFS Chlorophyll Concentration, by Region
1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 70
10
20
30
40
50
60
Chlorophyll (g/l)
1 0.0 - 0.52 0.5 - 1.03 1.0 - 1.54 1.5 - 2.05 2.0 - 2.56 2.5 - 3.07 > 3.0
May 1999
North BasinSubpolar FrontSouth BasinKorean Coast
% T
otal
RO
I A
rea
1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 70
5
10
15
20
25
30
35
8090
100April 1999
Chlorophyll (g/l)
North BasinSubpolar FrontSouth BasinKorean Coast
% T
otal
RO
I A
rea
1 0.0 - 0.52 0.5 - 1.03 1.0 - 1.54 1.5 - 2.05 2.0 - 2.56 2.5 - 3.07 > 3.0
1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 70
10
20
30
40
50
60
70
80
90
100
North BasinSubpolar FrontSouth BasinKorean Coast
Chlorophyll (g/l)
June 1999
% T
otal
RO
I A
rea
ROI
1 0.0 - 0.52 0.5 - 1.03 1.0 - 1.54 1.5 - 2.05 2.0 - 2.56 2.5 - 3.07 > 3.0
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SeaWiFS Monthly Mean Chlorophyll Concentration, by Region
JFMAMJ JA JFMAMJ JA JFMAMJ JA JFMAMJ JA JFMAMJ JA0.0
0.5
1.0
1.5
2.0
2.5
3.0
Entire BasinNorth BasinSubpolar FrontSouth BasinKorean Coast
Mea
n C
hlor
ophy
ll (
g/l)
ROI
January - August, 1999
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Summary
• SST at the front increased ~ 6° over 1.5 month period from late April to early June.
• SST/chlorophyll relationship is complex:- high chlorophyll related to mixing regimes?
- not tied as much to water mass distribution?
• At Subpolar Front, chlorophyll concentration was highest south of front in March and April, north of front in May and June (although concentrations were lower).
• Spatial/Temporal Distributions:April - highest chlorophyll in Korean Coastal and
South Basin; lower at Front and North Basin.
May - Decrease at Korean Coast and South Basin (sharp); no change at Front; highest at North Basin (sharp increase).
June - All areas very low, particularly South Basin; North basin is the highest.