![Page 1: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/1.jpg)
Trophodynamics
20-22 June 2011 RSCIW Workshop 1
• Developed by Raymond Lindemann, a limnologist, but
• Largely abandoned by them, and
• Enthusiasticallyemployed by oceanographers
• Basis of productivity studies
![Page 2: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/2.jpg)
20-22 June 2011 RSCIW Workshop 2
The Major Goal of Biological Oceanography:
“…determination of time-varying plankton productivity in the world ocean…”
-Barber and Hilting (2002)
![Page 3: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/3.jpg)
Simple Model for Productivity, PP
20-22 June 2011 RSCIW Workshop 3
PP = × aph × Eo
Primary production = ‘fraction’ of Irradiance absorbed x efficiency of conversion
![Page 4: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/4.jpg)
Since Chl-a is the main ocean color data product
20-22 June 2011 RSCIW Workshop 4
PP = × a*ph × Chla × Eo
![Page 5: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/5.jpg)
Absorption Properties
20-22 June 2011 RSCIW Workshop 5
atot = aw + acdom + anap + aph
Case 2 waters: acdom and anap
• are significant, or dominant• do not co-vary with aph
![Page 6: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/6.jpg)
PPinsitu may be predictable from the Simple Model
• Gulf of Maine in the ‘90s• Turbid Estonian Lakes• Irish Sea
20-22 June 2011 RSCIW Workshop 6
Examples from:
![Page 7: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/7.jpg)
Gulf of Maine, ‘90s
20-22 June 2011 RSCIW Workshop 7
Marra et al. 1993, L&O
![Page 8: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/8.jpg)
Estonian (Turbid) Lakes
20-22 June 2011 RSCIW Workshop 8
Arst et al., 2008
![Page 9: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/9.jpg)
Irish Sea:Absorption Model explained more
variance
20-22 June 2011 RSCIW Workshop 9
Tilstone et al., 2005
![Page 10: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/10.jpg)
20-22 June 2011 RSCIW Workshop 10
Irish Sea:Application to Satellite Data
Tilstone et al., 2005
![Page 11: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/11.jpg)
The Way Forward
1. Need a model for CDOM (at least) dynamics
(‘light utilization index’) models deserve another look
20-22 June 2011 RSCIW Workshop 11
![Page 12: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/12.jpg)
1. CDOM Dynamics
20-22 June 2011 RSCIW Workshop 12
Arabian Sea, SE Monsoon
Increasing time near surface?
Increasing photo-oxidation?
![Page 13: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/13.jpg)
2. models
20-22 June 2011 RSCIW Workshop 13
Falkowski, 1981
= B/4.6
Requires and accurate definition of the euphotic zone!
Platt, 1986
![Page 14: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/14.jpg)
20-22 June 2011 RSCIW Workshop 14
modeling: Northern Gulf of Mexico
![Page 15: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/15.jpg)
20-22 June 2011 RSCIW Workshop 15
We need better estimates of the Compensation Depth to define the
Actual Euphotic Zone
![Page 16: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/16.jpg)
ONDEQUE, PP and Rp for
stations in the NW Atlantic
20-22 June 2011 RSCIW Workshop 16
![Page 17: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/17.jpg)
The Compensation Depth (where P=R)
20-22 June 2011 RSCIW Workshop 17
ONDEQUE program, NW Atlantic, 2008Marra et al., submitted
1%Eo
P=R
![Page 18: 7 Marra RSCIW - University of Wisconsin–Madison · Marra et al. 1993, L&O. Estonian (Turbid) Lakes 20-22 June 2011 RSCIW Workshop 8 Arst et al., 2008. Irish Sea: Absorption Model](https://reader035.vdocuments.us/reader035/viewer/2022071511/613139af1ecc5158694499f7/html5/thumbnails/18.jpg)
20-22 June 2011 RSCIW Workshop 18
AUTOTROPH BACTERIAL
RESPIRATION
DISSOLVED ORGANIC MATTER
EUPHOTIC DEPTH