PI: Raymond Sambrotto dataset: version Aug 12, 97 N-15 uptake rates for nitrate, ammonium and urea, concentrations of ammonium, urea and total particulate N and C from Trace Metal (TM) free and CTD casts project/cruise: Arabian Sea/TN049 - Process Cruise 4, Jul 17 - Aug 15, 95 ship: Thomas Thompson Methodology: 1. Ammonium - nanomolar ammonium concentrations, as measured by a spectrophotometric procedure based on the Berthelot reaction followed by an extraction step to concentrate the indophenol. References: a) Brzezinski, M.A. (1987) Colorimetric Determination of nanomolar concentrations of ammonium in seawater using solvent extraction. Marine Chemistry, 20, 277-288. b) Selmer, J.S. and F. Sorensson (1986) New Procedure for extraction of ammonium from natural waters for 15N isotopic ratio determinations. Applied Environmental Microbiology, 52, 577-579. 2. Urea - urea concentration as measured by a spectrophotometric procedure based on the diacetylmonoxime reaction. Reference: Whitledge, T.E., S.C. Malloy, et al. (1981) Automated nutrient analysis in seawater. Department of Energy and Environment, Brookhaven National Laboratory, Upton, NY. 3. N-15 uptake - A. Uptake rates for nitrate and urea were measured by incubation experiments to follow the incorporation of trace additions of N-15 labeled substrate into particulate material collected by Whatman GF/F filters. Reference: Sambrotto,R.N., J.H. Martin, et al. (1993) Nitrate utilization in surface waters of the Iceland Basin during spring and summer of 1989. Deep-Sea Research II. Vol. 40, No.1/2, 441-457. B. Methodology for ammonium rates was similar to that for nitrate and urea, except that modified isotope dilution model was used to calculate uptake. Reference: Glibert, P. M., F. Lipschultz, et al. (1982). Isotope dilution models of uptake and remineralization of ammonium by phytoplankton. Limnology and Oceanography 27: 639-650. 4. Particulate carbon and nitrogen - the concentration of either particulate carbon or nitrogen as measured by collection on Whatman GF/F filters, followed by Dumas combustion, cryogenic separation and manometric analysis. Parameter Description Units --------------------------------------------------------------------------- Header record rec record number always 1 ship NODC ship code cruise originator's cruise id lat latitude in decimal degrees (minus = south) long longitude in decimal degrees (minus = west) date/time date and time reported as follows (YYYYMMDDHHmm) sta station number from event log cast CTD or TM cast number from event log Date record rec record number always 3 depth_n nominal depth NH4 ammonium concentration nanomoles/liter Urea urea concentration (as nitrogen) micromoles/liter C_p_tot total particulate carbon concentration micromoles/liter N_p_tot total particulate nitrogen concentration micromoles/liter pNO3 nitrate uptake rate micromoles/liter/day pNH4 ammonium uptake rate micromoles/liter/day pUrea urea uptake rate micromoles/liter/day -.9 missing / bad data rec ship cruise lat long date/time sta/cast 1 3250 TTN049 22.3665 59.8830 199507180426 1-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 0 55 -.9 -.9 -.9 -.9 -.9 -.9 3 1 128 -.9 31.19 4.39 0.1251 -.9 -.9 3 2 229 -.9 28.42 3.91 0.1536 0.0405 -.9 3 4 389 -.9 14.85 1.86 0.0052 -.9 -.9 3 7 176 -.9 -.9 -.9 -.9 -.9 -.9 3 11 224 -.9 11.05 1.17 0.0045 -.9 -.9 3 14 288 -.9 17.38 2.04 0.0031 0.0046 -.9 3 21 73 -.9 -.9 -.9 -.9 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 22.5346 61.1911 199507181630 2-004 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 9 150 -.9 6.26 0.88 0.0063 0.0445 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 21.8253 62.3972 199507190136 3-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 0 101 -.9 7.25 0.9 0.0345 -.9 -.9 3 4 86 -.9 -.9 -.9 -.9 -.9 -.9 3 10 76 -.9 5.08 1.03 0.0067 0.017 -.9 3 17 65 -.9 -.9 -.9 -.9 -.9 -.9 3 26 48 -.9 -.9 -.9 -.9 -.9 -.9 3 37 35 -.9 5.4 0.35 0.0004 -.9 -.9 3 45 33 -.9 2.56 0.45 0.0011 0.0018 -.9 3 65 28 -.9 2.52 1.17 0.0018 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 21.1779 63.5574 199507191343 4-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 12 40 -.9 3.18 0.56 0.0195 0.0058 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 20.5526 64.6597 199507200059 5-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 0 46 -.9 1.25 0.22 0.004 -.9 -.9 3 16 56 -.9 3.99 0.33 0.0052 0.0203 -.9 3 26 81 -.9 1.47 0.5 0.0092 -.9 -.9 3 40 48 -.9 5.82 0.68 0.0036 -.9 -.9 3 57 66 -.9 -.9 0.29 0.0014 -.9 -.9 3 70 81 -.9 6.36 0.24 -.9 0.0018 -.9 3 100 83 -.9 1.02 -.9 -.9 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 19.8698 65.8880 199507201245 6-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 2 10 -.9 2.24 0.42 0.0061 0.0048 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 19.1608 67.1566 199507210723 7-003 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 0 196 -.9 0.95 0.22 0.0061 -.9 -.9 3 16 30 -.9 7.58 0.75 0.0094 0.0103 -.9 3 26 -.9 -.9 1.45 0.36 0.0038 -.9 -.9 3 37 154 -.9 1.98 0.36 0.0015 -.9 -.9 3 52 -.9 -.9 0.8 0.18 0.0008 -.9 -.9 3 60 199 -.9 0.93 0.22 0.0039 -.9 -.9 3 89 -.9 -.9 1.01 0.08 0 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 18.2721 67.5989 199507231551 8-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 9 10 -.9 4.78 0.76 0.0177 -.9 -.9 3 60 10 -.9 6.05 0.33 0.0008 0.0007 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 17.2989 67.9366 199507240017 9-001 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 5 63 -.9 3.5 0.36 0.0163 -.9 -.9 3 16 48 -.9 4.37 0.33 0.017 0.0093 -.9 3 23 30 -.9 3.62 0.65 0.0176 -.9 -.9 3 31 90 -.9 5.69 0.79 0.0187 -.9 -.9 3 42 70 -.9 5.11 0.61 0.0112 -.9 -.9 3 50 46 -.9 6.11 0.53 0.002 0.0068 -.9 3 70 45 -.9 4.52 0.33 0.0005 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 15.3828 68.7500 199507242341 11-001 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 5 -.9 -.9 4.52 0.82 0.0216 -.9 -.9 3 16 10 -.9 5.7 0.59 0.023 0.0027 -.9 3 23 -.9 -.9 3.68 0.72 0.0136 -.9 -.9 3 31 -.9 -.9 -.9 -.9 -.9 -.9 -.9 3 43 -.9 -.9 9.72 0.76 0.0052 -.9 -.9 3 50 -.9 -.9 3.45 0.62 0.0019 -.9 -.9 3 70 -.9 -.9 2.51 0.62 0.0012 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 14.8983 66.8910 199507252032 12-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 5 27 -.9 9.89 1.25 0.0211 -.9 -.9 3 16 51 -.9 7.69 0.98 0.0346 0.0109 -.9 3 24 27 -.9 -.9 -.9 -.9 -.9 -.9 3 31 96 -.9 -.9 -.9 -.9 -.9 -.9 3 42 66 -.9 6.53 1.33 0.025 -.9 -.9 3 50 91 -.9 6.66 1.25 0.0113 0.0287 -.9 3 71 86 -.9 -.9 -.9 -.9 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 14.4492 65.0012 199507272114 13-003 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 31 174 -.9 8.14 0.68 0.0182 -.9 -.9 3 41 75 -.9 5.14 0.65 0.0135 -.9 -.9 3 50 103 -.9 1.19 0.36 0.003 -.9 -.9 3 70 83 -.9 -.9 -.9 -.9 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 14.4418 65.0018 199507272218 13-004 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 4 81 -.9 10.72 0.79 0.0076 -.9 -.9 3 16 20 -.9 7.4 0.73 0.0067 0.0091 -.9 3 23 61 -.9 -.9 -.9 -.9 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 13.2401 65.0070 199507282357 14-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 4 43 -.9 -.9 -.9 -.9 -.9 -.9 3 15 40 -.9 5.16 0.35 -.9 0.0255 -.9 3 22 40 -.9 4.34 0.65 0.0099 -.9 -.9 3 30 43 -.9 -.9 -.9 -.9 -.9 -.9 3 41 25 -.9 7.29 0.9 0.0087 -.9 -.9 3 49 27 -.9 11.98 0.9 0.0021 -.9 -.9 3 70 28 -.9 7.2 0.86 0.0018 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 12.0470 65.0143 199507291223 15-003 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 14 38 -.9 7.83 0.64 0.0021 0.0075 -.9 3 56 10 -.9 5.36 0.7 0.0041 0.0068 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 9.9981 64.9008 199507302110 17-004 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 28 27 -.9 3.59 0.54 0.0185 -.9 -.9 3 40 -.9 -.9 1.75 0.58 -.9 -.9 -.9 3 48 108 -.9 4.44 0.74 0.0021 -.9 -.9 3 52 45 -.9 -.9 -.9 -.9 -.9 -.9 3 69 154 -.9 3.37 0.15 0.0004 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 9.9964 64.8968 199507302208 17-005 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 1 38 -.9 7.14 0.79 0.0323 -.9 -.9 3 12 51 -.9 5.5 0.75 0.0272 0.0005 -.9 3 20 58 -.9 5.21 0.79 0.0321 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 9.9258 64.8926 199507310702 17-008 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 12 10 -.9 7.6 0.9 0.0017 0.0078 -.9 3 48 10 -.9 6.13 0.79 0.0013 0.0179 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 14.4450 65.0022 199508020724 18-003 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 4 36 -.9 -.9 -.9 -.9 -.9 -.9 3 5 58 -.9 -.9 -.9 -.9 -.9 -.9 3 12 207 -.9 7.14 1.61 -.9 0.0111 -.9 3 22 169 -.9 -.9 -.9 -.9 -.9 -.9 3 30 116 -.9 -.9 -.9 -.9 -.9 -.9 3 40 63 -.9 8.29 0.81 -.9 0.0065 -.9 3 50 41 -.9 -.9 -.9 -.9 -.9 -.9 3 72 68 -.9 -.9 -.9 -.9 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 14.8112 64.2497 199508021439 19-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 12 100 -.9 9.18 1.4 0.0189 0.0526 -.9 3 48 200 -.9 10.92 1.48 0.0126 0.0241 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 15.2314 63.5116 199508030037 20-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 1 312 -.9 8.02 1.25 0.0193 -.9 -.9 3 12 345 -.9 8.48 0.8 0.0132 0.0159 -.9 3 20 332 -.9 26.56 1.36 0.0246 -.9 -.9 3 28 292 -.9 6.98 1.25 0.0137 -.9 -.9 3 42 312 -.9 5.78 0.72 0.0054 -.9 -.9 3 48 227 -.9 5.24 0.65 0.0047 -.9 -.9 3 73 133 -.9 -.9 -.9 -.9 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 15.6344 62.8048 199508031215 21-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 13 48 -.9 5.31 1.02 0.0306 0.0176 -.9 3 50 23 -.9 5.25 0.81 0.0125 0.0045 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 16.0300 61.9988 199508032134 22-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 28 81 -.9 7.36 1.54 0.0068 -.9 -.9 3 40 95 -.9 4.66 0.7 0.0038 -.9 -.9 3 51 35 -.9 -.9 -.9 -.9 -.9 -.9 3 69 12 -.9 2.44 0.65 0.002 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 16.0328 61.9901 199508032259 22-003 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 1 73 -.9 6.27 0.97 0.0132 -.9 -.9 3 12 78 -.9 4.76 0.89 0.0085 0.0683 -.9 3 20 91 -.9 -.9 1.36 0.0077 0.0023 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 16.4267 61.2529 199508051451 25-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 8 30 -.9 8.23 1.62 0.0184 0.0194 -.9 3 30 35 -.9 5.44 1.08 0.0097 0.0014 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 16.7980 60.5018 199508060126 26-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 1 113 -.9 9.54 1.47 0.014 -.9 -.9 3 9 23 -.9 6.58 0.98 0.0137 0.0006 -.9 3 14 32 -.9 11.68 0.93 0.0074 -.9 -.9 3 20 51 -.9 6.73 1.22 0.0039 -.9 -.9 3 28 40 -.9 5.55 0.93 0.0029 -.9 -.9 3 34 20 -.9 5.61 0.96 0.0025 0.0037 -.9 3 49 7 -.9 2.45 0.42 0.0015 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 17.1973 59.7675 199508062115 27-004 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 19 161 -.9 4.87 0.86 0.0053 -.9 -.9 3 26 160 -.9 8.18 0.9 0.0016 -.9 -.9 3 32 248 -.9 7.11 0.95 0.0016 -.9 -.9 3 46 253 -.9 5.95 0.86 0.0003 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 17.1973 59.7689 199508062217 27-005 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 1 170 -.9 7.56 0.79 0.0064 -.9 -.9 3 8 110 -.9 6.37 0.92 0.0055 0.0015 -.9 3 13 72 -.9 5.25 0.68 0.0108 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 17.6744 58.8583 199508090102 28-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 1 444 -.9 3.94 0.97 0.0559 -.9 -.9 3 8 415 -.9 7.12 1.29 0.0903 -.9 -.9 3 13 303 -.9 6.9 1.08 0.0296 0.0128 -.9 3 19 313 -.9 4.73 0.93 0.0187 -.9 -.9 3 26 348 -.9 7.07 1.25 0.0274 -.9 -.9 3 32 680 -.9 3.73 0.79 0.0054 -.9 -.9 3 42 298 -.9 6.23 1.18 0.0045 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 18.1329 58.0083 199508092107 29-003 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 16 1066 -.9 7.25 1.25 0.0027 -.9 -.9 3 22 869 -.9 4.41 1.33 0.0016 -.9 -.9 3 27 1244 0.21 9.49 1.67 0.0023 0.0171 -.9 3 38 1232 -.9 6.82 1.22 0.0003 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 18.1319 57.9976 199508092216 29-004 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 1 960 0.09 6.7 1.15 0.0071 -.9 -.9 3 7 1124 0.09 3.32 0.88 0.0102 0.0122 -.9 3 11 1063 -.9 8.27 1.58 0.0067 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 18.1501 58.0058 199508110134 29-008 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 25 -.9 -.9 8.14 0.72 0.0063 -.9 -.9 3 40 -.9 -.9 6.41 0.65 0.001 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 18.4851 57.3012 199508112115 30-002 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 16 731 0.15 8.18 1.58 0.0094 -.9 -.9 3 22 857 0.21 15.5 3.04 0.0063 -.9 -.9 3 27 652 -.9 3.36 1.14 0.0025 0.0231 -.9 3 38 811 0.08 4.69 0.86 0.0024 -.9 -.9 rec ship cruise lat long date/time sta/cast 1 3250 TTN049 18.5018 57.3014 199508112231 30-003 rec depth_n NH4 Urea C_p_tot N_p_tot pNO3 pNH4 pUrea 3 1 572 0.44 9.41 1.5 0.0421 -.9 -.9 3 7 557 0.32 6.14 1 0.0161 0.0868 -.9 3 11 383 0.3 11.54 1.61 0.01 -.9 -.9