"baseline" (002)

• Same as 3D NENA run 801
• Includes KCDOM contribution to light attenuation

• Chlorophyll maximum is much too shallow
• PP is too low

• Same as baseline, but alpha was increased by an order of magnitude (from 0.025 to 0.25).

• Chlorophyll maximum is deeper then in "baseline" but still too shallow.

• Same parameters as baseline but w/o KCDOM contribution to light attenuation.

• Looks better than baseline in terms of Chl_max and PP
• almost no zooplankton
• N tends to accumulate in the small detritus pool (dead end for N-cycling)
• winter surface concentrations on the Scotian Shel fare too low (should be ~0.5 mg Chl/m3)

• Same as "old baseline" (004), but alpha was increased by an order of magnitude (from 0.025 to 0.25).

• wacky!
• chl_max at 100m
• PP on Scotion Shelf ~600-1000mg C/m2/d

• same parameters as old baseline (no KCDOM)
• increased sdet remineralization from 0.03 to 0.06

• PP is up
• winter chl is up even on the Scotian Shelf

• same parameters as old baseline (no KCDOM)
• increased sdet remineralization from 0.03 to 0.15

• same

• same parameters as old baseline (no KCDOM)
• increased sdet remineralization from 0.03 to 0.3

• same

• same parameters as old baseline (no KCDOM)
• increased sdet remineralization from 0.03 to 0.4

• same as 008, but maximum grazing increased from 0.6 to 1

• zooplankton concentrations increase
• ammonium concentrations increase; especially in winter in GOM and Scotian Shelf

• same as 008, but maximum grazing increased from 0.6 to 0.75

• zoopl. max. growth rate: ZooGR=0.6
• SDetRem = 0.4
• alpha = 0.025
• w_Phy = 0.1 m/d
• w_LDet = 1 m/d
• wSDet = 0.1 m/d
• ran from June/03 to the end of 05
• run w/DNF

• 851 has too much productivity and too high concentrations of NH4, phy, chl, zoo
• too little DNF
• could try to increase LDet sinking and aggregation parameter for MAB station
• somehow make all the NH4 accessible, maybe?
• the 1D initial conditions don't reflect 3D ini. cond. well -- redo 1D with modified ini. cond. (see 013 below)
• Note: 3D is much more productive on the shelves than 1D; is this due to horizontal transport?

• 1D run 013 is like 012 but started with initial conditions from 851 (not the old 1D initial conditions used by 012)

• identical parameters but 013 has more appropriate initial conditions (from 851)

• in 014 I increased wLDet to 5m/d from 1m/d

• The only state variable that seems affected by an increase in large Det sinking rate is large Det (it decreases). DNF rate is up slightly in the MAB. Still too much PP, too high NH4, phy, zoo, chl.

• in 015 I increased the nitrification rate nitrR to 0.1 /d (from 0.05 /d in 013)

• Only effect is that NO3 is up a bit while NH4 is down a bit. Nothing else seems to have changed.

• in 016 I increased nitrR further to 0.2/d

• Same as in 015.

• in 017 I increased coagulation rate coagR to 0.01 (from 0.005 in 013)

• NO3 decreased. Phy decreased only slightly. Zoo is a bit lower. LDet is up. DNF is up.

• Based on runs 014 - 017 I should try to increase all three: wLDet, nitrR and coagR.
• Done as follows:
• wLDet = 5 m/d
• nitrR = 0.2 /d
• coagR = 0.01

• Everything seems to have changes in the right direction
• I may even want to try increasing coagR more

• like 018 but increased coagulation rate even more to 0.02

• changes went even further than in 018; all in the right direction but in this 1D simulation MAB shelf station runs out of nitrogen; maybe in the 3D simulatoin it would be counterbalanced by rivering input?

• compare coagR = 0.01 (018) with 0.02 (019)

• compare 851 to old baseline 801 (with KCDOM contributoin to light attenuation)

• increased ZooGR to 1.0 in 852 (from 0.6 in 851)

• increased ZooGR to 1.2 in 853 (from 1.0 in 852)

• parameters as above
• 018b is w/o DNF

• At the MAB station I see an increase of annual air-sea gas exchange from 373 mmol C/m2/yr (w/DNF) to 494 (w/oDNF)

• parameters as above
• 019b is w/o DNF

• At the MAB station I see an increase of annual air-sea gas exchange from 263 mmol C/m2/yr (w/DNF) to 511 (w/oDNF)