46 1 ( ) Vol. 46 Sup. 1

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1 46 1 () Vol. 46 Sup Journal of Xiamen University (Nat ural Science) Aug , 1,2, 1 3 (1. ( ),2., ) : SeaWiFS,, 2,16. 7 %, , ( %, , 0. 56),. Gulf of Mexico Monterey Bay Arabian Sea,. : ;;; : P :A : (2007) S Zeu ( Eup hotic Zone Dept h) PAR ( Photosynt hetic Available Radia2 tion) 1 % [1-3 ].,.,. K, [4-5 ],. K,,. [6-11 ], (AOP).,., -, [ 5,12 ] ( [ Chl ] ).,Lee ( IO P) [13-14 ] ( Lee ), : : ( , , ), 863 (2006AA09A302),, 3 edu. cn 490 nm a bb, ( nm) KVIS [14 ],. ( Gulf of Mexico) Monterey Bay Arabian Sea,,, %( m),, ;, ,, PA R [ Chl ] , 1. R rs NASA SeaWiFS L2,. Sea2 WiFS( MLAC) SeaDAS, E, N L3. PAR SB E19 CTD PAR, z.,,(1 h, 6.,,

2 1 : 13 KVIS ( z) Zeu = (3), KVIS ( z),( nm), ( IOP) [2,14 ], : Fig. 1 Map of stations during 1998,1999,2004 cruise in Taiwan Strait 1. 1, Sp1 ; 5 5 5, Sp5 ; 9 9 9, Sp9. 1 Tab. 1 Matched numbers in different time and space 2 h 3 h 4 h Sp Sp Sp PAR Zeu PAR : r PAR z = PA R z PA R 0 (1),PAR z z, PAR 0. Zeu ( r PAR 1 %) r PAR z, Zeu mea Zeu (i) Lee Lee [2 ],( nm), z EVIS ( z) EVIS (0), [2-3,5 ] : EVIS ( z) = EVIS (0) e - K VIS ( z) z (2) 1 %,(2) KVIS ( z) = K1 + K2 (1 + z) 0. 5 (4), K1 K2 a(490) bb (490) a. a a (490) bb (490), KVIS ( z). (2) (3) Zeu, Zeu dir - IOP. a(490) bb ( 490) QAA [ 2,15 ] SeaWiFS Rrs. (ii) [ Chl ] [ Chl ] Zeu [5,12 ] : Zeu = a [ Chl ] b, a b, [2 ]. (5) Zeu, Zeu dir - [ Chl ].,[ Chl ] SeaWiFS Rrs, [ Chl ] dir, OC4V4 [16 ] : [ Chl ] = 10 = log 1. 4 max Rrs 440,490,510 Rrs (6), : (Average Error) RMS( Root Mean Square). : = 1 RMS = n n i = 1 1 Zeu dir i n - Zeu mea i Zeu mea i n i = 1 2 (7) 100 % (8) [log ( Zeu dir i ) - log (Zeu mea i ) ] Zeu (9) (2),Zeu,. Zeu dir - IOP 5 m, Zeu dir - [ Chl ] 9 m. Sp1 Sp5, T16 (1998),. ( Sp9), F0 (2004),,, T16.,F0 9 9 (80 km 2 ),F0,

3 14 () Zeu ( 3 h 2 h) Fig. 2 Zeu from in situ and derived remote sensing, [17 ],,.,,. Lee ( Zeu dir - IOP ) ( Zeu mea ) 2. Lee (3) %(Sp1 2 h) %(Sp5 4 h), (Sp1 2 h) ( Sp5 4 h), %(Sp1), G1,3 h.,(average error) (Max error) ( RMS) (Sp1) ( 2 h),. [ Chl ] Zeu dir - [ Chl ] Zeu mea ( Sp1) (3), (4). 39 %, 0. 15, %, G1. [ Chl ], [ Chl ] mea mg/ m 3 ;[ Chl ] dir mg/ m 3,, % ( 3 h) % ( 2 h), ( 2 h) ( 4 h) %, %, F G1. 4,OC4V4 [ Chl ] [ Chl ]1 1,, [ 18 ]. [ Chl ] Lee,., [ Chl ], [ Chl ] [12 ], [ Chl ]., OC4V4 [19 ] [ Chl ]Zeu,. 2 Lee Zeu Tab. 2 Comparison between in situ Zeu and Lee approach / % / % r 95 %r 4h h h [ Chl ]Zeu Tab. 3 Comparison between in situ Zeu and [ Chl ] approach / % / % r 95 %r 4 h 3 h 2 h 4 h 3 h 2 h 4 h 3 h 2 h 4 h 3 h 2 h 4 h 3 h 2 h [ Chl ] OC4V

4 1 : 15 3 Lee Zeu Fig. 3 Comparison between in situ Zeu and Lee approach 2. 2 Zeu Lee Gulf of Mexico t he Arobian Sea the Monterry Bay [2 ], Mex. Lee ( Sp1 2 h) Mex (4),Mex.,Mex, R rs, PAR ; SeaWiFS R rs, PAR ;,RMS 0. 07,. Zeu,. 2, [ 9 ] 4 Mex Tab. 4 Comparison between TW and Mex Lee [ Chl ] OC4V4 [ Chl ] TW Mex TW Mex TW Mex ( %) ( %)

5 16 () [ Chl ]Zeu OC4V4 [ Chl ] Fig. 4 Comparison between in situ Zeu and [ Chl ] approach,comparison between in situ [ Chl ] and OC4V4 approach, % ; [20 ], %. Lee SeaWiFS R rs [21 ],, RMS ,. 3,Lee RMS 0. 07, %, %22. 6 %. Lee [ Chl ],,, Lee. Lee IOP,,. [ Chl ], OC4V4,,[ Chl ]Zeu,. :,NASA SeaWiFS, NASA. : [1 ] Morel A,Antoine D,Babin M,et al. Measured and mod2 eled primary production in the northeast Atlantic ( EU2 M EL I J GOFS program) :the impact of natural variations in photosynthetic parameters on model predictive skill [J ]. Deep2Sea Research I,1996,43 (8) : [2 ] Lee Z P, Weidemann A, Kindle J, et al. Euphotic zone depth : It s derivation and implication to ocean2color re2 mote sensing[j ]. J GR,2007,112,C [3 ],,. [J ].,2003,13 (1) : [4 ],. 2[J ].,2004,14 (1) : [5 ],. [J ].,2002,21 (3) : [6 ] Austin R W,Petzold T. The determination of the diffuse attenuation coefficient of sea water using the coastal zone color scanner [ M ]ΠΠGower J F R, Oceanography from space. New York : Plenum Press,1981 : [7 ] Mueller J L. SeaWiFS algorithm for the diffuse attenua2 tion coefficient, K(490), using water2leaving radiances at 490 and 555 nm [ M ]ΠΠSeaWiFS postlaunch calibration

6 1 : 17 and validation analyses, Part 3,NASA Tech Memo, ,2000,11 : [8 ],,. [J ].,1993,15 (5) : [9 ],,,. [J ].,2005,27 (5) : [10 ],,,. Kd (490) [J ]., 2003, 22 (1) : [11 ],,,. [J ].,2004,23 (4) : [12 ] Morel A,Maritorena S. Bio2optical properties of oceanic waters :a reappraisal [J ]. J GR,2001,106 ( C4) : [13 ] Lee Z P,Du K P,Arnone R. A model for the diffuse at2 tenuation coefficient of downwelling irradiance [ J ]. J GR,2005,110,C [14 ] Lee Z P,Du K P,Arnone R,et al. Penetration of solar radiation in the upper ocean :a numerical model for oce2 anic and coastal waters[j ]. J GR,2005,110,C [15 ] Lee Z P,Carder K,Amone R. Deriving inherent optical properties from water color :a multiband quasi2analytical algorithm for optically deep waters[j ]. Applied Optics, 2002,41 (27) : [16 ],,,. a [J ]., 2004,28 (8) : [17 ],,,. 2 [ C ]ΠΠ,. 2. :,1991. [18 ] Zhang C Y, Hu C M,Shang S L,et al. Bridging between SeaWiFS and MODIS for continuity of chlorophyll2a concentration assessment s off Southeastern China [ J ]. Remote Sensing Environment,2006,102 : [19 ] O Reilly J E,Maritorena S, Siegel D,et al. Ocean color chlorophyll a algorithms for SeaWiFS,OC2,and OC4 : Version 4[ M ]ΠΠHooker S B, Firestone E R,eds. SeaW2 ifs postlaunch tchnical report series SeaWiFS postla2 unch calibration and validation analyses, Part 3. Green2 belt, Maryland : NASA Goddard Space Flight Center, 2000,11 :9-23. [20 ],,,. SeaWiFS [J ].,2004,26 (5) : [ 21 ] Shang S L,Zhang C Y, Hong H S,et al. Short2term var2 iability of chlorophyll associated with upwelling event s in the Taiwan Strait region during southeast monsoon of 1998[J ]. Deep2Sea Research,2004,51 (10/ 11) : A Test of a Semi2analytical Algorithm f or Euphotic Zone Depth in the Taiwan Strait C H EN Jing2jing 1,SHAN G Shao2ping 1,2,S HAN G Shao2ling 1 3 (1. State Key Laboratory of Marine Environmental Science ( Xiamen University), 2. Deprtment of Oceanography,Xiamen ,China) Abstract : This article employs SeaWiFS data over the Taiwan Strait to evaluate a semi2analytical algorithm for euphotic zone depth. This algorithm is based on water s inherent optical properties ( IOP),which can be near2analytically calculated from spectral remote2sensing reflectance (provided by SeaWiFS). Compared with in situ Zeu ( 2 h),average error is %,root mean square is and correlation coefficient is It has higher accuracy compared to chlorophyll2a approach (average error is %,root mean square is ,correlation coefficient is 0. 56). It is found that the new algorithm not only worked well with waters of the Gulf of Mexico Monterey Bay and Arabian Sea,but also worked well with waters of the Taiwan Strait. Key words : Taiwan Strait ;euphotic zone depth ;remote sensing quasi2analytical algorithm ;chlorophyll