Appendix

In order to evaluate the sea—air CO2 flux in the equatorial Pacific, we divided the equatorial Pacific into regions (Fig. A.1) on the basis of the current system and carbonate chemistry in the equatorial Pacific. In the eastern equatorial Pacific, we evaluated the pCO2w-SST relationships in the NECC and SEC by examining the latitudinal distribution of pCO2w. The pCO2w in the SEC is remarkably larger than pCO|ir and the pCO2w in the NECC nearly equal to pCO|ir. If we could not obtain a good pCO2w-SST relationship, we divided the SEC and NECC of the eastern Pacific longitudinally into a few regions where a good pCO2w-SST relationship was shown. The longitudinal boundary in the eastern and central equatorial Pacific was a mid-point between two meridional transects of shipboard observations. In the central equatorial Pacific, if we observe the pCO2w-SST relationship for the NECC, we divided the central Pacific into two regions. Longitudinally we estimated the eastern edge of western Pacific warm pool (western equatorial Pacific) by examining pCO2w/SSS change against longitude. If we could not obtain a good pCO2w-SST relationship, we divided western equatorial Pacific warm pool into two regions where a good pCO2w-SST relationship was shown. The equations used to estimate the pCO2w on the basis of SST field are given in the Table A.1.

Jan.-Feb. 1998

VI

1 1 1

:, , ,

, , ,

, , ,

Jan.-Feb. 1999

Jan.-Feb. 1999

. 1 1 1

! 1 ■ IV !

V

lI I

:

i , , , i , , , i ,

160 180 -Dec. 1999

180 160 Longitude

II I

II I

160 180 -Dec. 1999

160 140 120 100°W

1

, , ,

, , , IV

, , ,

1 1

, , , II

1.

, , ,

, , ,

, ,

, , ,

180 160 Longitude

140 120 100°W

Jan.-Feb. 2001

140°E 160 180 160 Nov. 2001-Feb. 2002

140 120 100°W

140°E 160 180 160 Nov. 2001-Feb. 2002

140 120 100°W

II ; :

IV

III

:, , , i , , ,

■ ■ ■ i . . . i

. . i . . . i . =

140°E 160 180 160 Oct. 2002-Jan. 2003

140 120 100°W

160 140 120 100°W

140°E 160 180 160 Oct. 2002-Jan. 2003

140 120 100°W

140 120 100°W

140°E 160

180 160 Longitude

140 120 100°W

Figure A.1: The equatorial Pacific was divided, rather arbitrarily, into areas that provided a good pCO2w-SST relationship. The equations used in the respective areas are given in Table A.1.

Table A.1: pCO2w-SST relationship in the equatorial Pacific used in this work.

January/February 1998

(SST>29 °C) Region I pCO2w(4.8) - 363.1 (SSTr29 °C) Region II pCO2w(8.6) - 354.5 pCO|ir - 347.8(0.9) Region III Inoue et al. (2002)a Region IV Inoue et al. (2002)a Region V Inoue et al. (2002)a

January/February 1999 Region I pCO2w(6.1) - 269.7(4.7)+8.17(0.19)SST Region I pCO2w(6.7) - 1019.3(6.5)-24.49(0.25)SST Region III pCO2w(5.3) - 758.3(3.7)-12.77(0.14)SST Region IV pCO2w(2.4) - 1678.0(41.8)-47.69(1.53)SST Region V pCO2w - 362.1(7.5) pCO|ir - 354.4(2.9)

891 0.678

833 510 891

498 782 661 24 447 1280

Table A.1 (Continued)

January/February 1998

November/December 1999

Region I pCO2w(14.6) - 726.2(6.1)-12.17(0.28)SST 2268 0.678

Region II pCO2w(8.4) - 777.6(7.1)-16.95(0.28)SST 666 0.918

Region III pCO2w(6.6) - 932.7(8.3)-18.20(0.29)SST 556 0.936

Region IV pCO2w(4.9) - 1182.5(42.5)-28.45(1.58)SST 48 0.936

Region V pCO2w(4.4) - -180.1(67.8)+18.42(2.27)SST 178 0.522

Region VI pCO2w(3.4) - -503.6(74.4)+28.50(2.51)SST 95 0.762 pCO!ir - 355.9(1.3) 3426

January/February 2001

Region I pCO2w(20.2) - 1202.4(46.2)-27.56(1.83)SST 517 0.552

Region II pCO2w(7.9) - 1904.8(68.5)-56.48(2.59)SST 252 0.809

Region III pCO2w(2.7) - 264.2(13.3)+9.17(0.52)SST 469 0.635 Region IV pCOT - 472.3(3.9) 3566

Region VI pCO2w(2.5) - 1886.0(87.4)-54.18(3.17)SST 16 0.977 Region VII pCO2w - 371.1(4.0) 182 pCOa2ir - 356.0(1.3) 5259

November 2001/February 2002

Region I pCO2w(19.1) - 742.3(9.0)-12.92(0.41)SST 3025 0.498

Region II pCO2w(9.8) - 570.6(5.3)-8.43(0.21)SST 1156 0.767

Region III pCO2w(7.7) - 910.8(20.5)-16.82(0.72)SST 408 0.757 Region IV pCOT - 368.5(8.6) 596 pCOa2ir - 358.5(1.7) 4643

October 2002/January 2003 Region I pCO2w - 450.4(14.1) 2211 Region II pCO2w - 352.5(2.8) 359 Region III pCO2w(4.5) - 651.4(6.9)-10.79(0.26)SST 549 0.869 Region IV pCO2w(4.0) - 1041.3(13.7)-21.50(0.48)SST 355 0.923 Region V pCO2w(2.9) - -211.2(6.5)+19.41(0.22)SST 592 0.965 Region VI pCO2w(3.3) - 9.9(9.3)+12.36(0.32)SST 905 0.793 _pCOjir - 359.8(1.4)_4077_

pCO2w-SST relationship: The standard error of analysis (in matm) is listed in parentheses after eachpCO2w, the standard error for the coefficient and intercept are in parentheses after coefficient and intercept, n is the number of data, and r is the correlation coefficient. pCO|ir: Average value during the cruise and standard deviation from the average are listed in parentheses. Some pCO2w are listed in the same manner. apCO2w data were estimated on the basis of Table 1 by Inoue et al. (2002).

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