18 



M^ 



mi 



15 



11 



4T 11 



18 



MP 



-^> 



4T 11 



21 



-3 



■ *%> -^ 



If 20? ST 13? 13? 32 



29 



34 



57 



IB) 



13 



2? 28 



15 



-^> 



2? 23 



17 

 <3- — I 



-^> -^> 



4? 34 



3? 27' 



21 24 



-^> 



7? 33 



31 



(CI 



ID) 



26 



87 



1ST 38' 



Q 



132 



E49] 



44? 59 



14^ ^ 



Go] 



195 



36? 30 



00 



261 



31? 86 



30 



450 



13 



4? -18 



39 



-2V 



5? -8 



ElE 



48 



10Q L3 



10T -6 



-41 



93 



12T7 



RT1 



133 



^> 



35T 22 



-30 



219 



29 



18 



10 



KM 



1 3) 



(14) 



(24) 



-5 



(41) 



-11 



(33) 



Figure 4. Two dimensional box model for the lower Hudson Estuary for sta- 

 tions between MP 18 and MP -7. Models (A) and (B) are for volume transport 

 (10 m d ) during high flow and lyw flow periods respectively. Models (E) 

 and (D) are for mass transport (10 mg Chi ad ), during high and low pe- 

 riods respectively. Arrows indicate downstream upper layer flow, upstream 

 lower layer flow, and vertical advection from lower to upper layer. Double 

 headed arrows in (A) and (B) indicate the vertical exchange coefficient, 

 E (10 kg d ppt ). Double headed arrows in (C) and (D) indicate vertical 

 transport of Chi a due to exchange ([ + ] upward [-] downward), and source (+) 

 and sink (-) fluxes are in the center boxes. 



178 



