Gulf of Mexico 600 Year Mg/Ca SST Reconstructions ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Gulf of Mexico 600 Year Mg/Ca SST Reconstructions LAST UPDATE: 6/2010 (Original Receipt by WDC Paleo) CONTRIBUTORS: Richey, J.N., R.Z. Poore, B.P. Flower, T.M. Quinn, and D.J. Hollander. IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2010-050 WDC PALEO CONTRIBUTION SERIES CITATION: Richey, J. N., et al. 2010. Gulf of Mexico 600 Year Mg/Ca SST Reconstructions. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2010-050. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Richey, J.N., R.Z. Poore, B.P. Flower, T.M. Quinn, and D.J. Hollander. 2009. Regionally coherent Little Ice Age cooling in the Atlantic Warm Pool. Geophys. Res. Lett., 36, L21703, doi:10.1029/2009GL040445 ABSTRACT: We present 2 new decadal-resolution foraminiferal Mg/Ca-SST records covering the past 6-8 centuries from the northern Gulf of Mexico (GOM). These records provide evidence for a Little Ice Age (LIA) cooling of 2°C, consistent with a published Mg/Ca record from Pigmy Basin. Comparison of these 3 records with existing SST proxy records from the GOM-Caribbean region show that the magnitude of LIA cooling in the Atlantic Warm Pool (AWP) was significantly larger than the mean hemispheric cooling of <1°C. We propose that a reduction in the intensity and spatial extent of the AWP during the LIA, combined with associated changes in atmospheric circulation may account for the regional SST patterns observed in the GOM-Caribbean region during the LIA. GEOGRAPHIC REGION: Gulf of Mexico PERIOD OF RECORD: 600 YrBP - present DESCRIPTION: Foraminiferal Mg/Ca SST reconstructions from the Fisk and Garrison Basins in the northern Gulf of Mexico covering the last 600 years at decadal resolution. Mg/Ca measurements are on the 250-300 micron size fraction of Globigerinoides ruber (white). Mg/Ca is converted to SST using the equation: Mg/Ca=0.449exp(0.09*SST). Fisk Basin box core PE07-5I: 27°33.0'N, 92°10.1'W, 817 m depth Garrison Basin box core PE07-2: 26°40.5'N, 93°55.5'W, 1570 m depth DATA: 1. c14 Ages Garrison Basin CoreDepth(mm) 14Cage(yrs) error(yrs) CalYrsBP 0-5 140 35 0 0-5 455 25 41 70-75 935 35 186 120-125 1435 45 604 200-205 2080 20 1248 270-275 2495 35 1666 340-345 3300 35 2695 390-395 3640 30 3064 Fisk Basin CoreDepth(mm) 14Cage(yrs) error(yrs) CalYrsBP 0-5 -215 30 0 150-155 925 35 523 160-165 1090 30 652 200-205 1210 30 743 2. Garrison Basin Mg/Ca SST estimates CoreDepth CalYrsBP Mg/Ca SST(ºC) 0 0.0 4.43 25.44 5 11.8 4.29 25.08 10 24.7 4.42 25.40 15 38.6 4.26 25.00 20 53.6 4.13 24.65 25 69.6 4.06 24.47 30 86.6 4.21 24.87 35 104.5 3.81 23.76 40 123.5 3.96 24.20 45 143.3 4.33 25.19 50 164.2 3.95 24.17 55 185.9 4.00 24.30 60 208.6 3.80 23.72 65 232.1 4.01 24.32 70 256.6 3.73 23.53 75 281.9 3.78 23.68 80 308.0 4.02 24.35 85 335.0 3.91 24.05 90 362.8 3.90 24.02 95 391.4 4.51 25.63 100 420.8 4.19 24.83 105 451.0 3.79 23.70 110 482.0 4.07 24.49 115 513.6 3.77 23.66 120 546.0 3.76 23.61 125 579.2 3.88 23.96 3. Fisk Basin Mg/Ca SST estimates CoreDepth CalYrsBP Mg/Ca SST(ºC) 0 0 4.75 26.21 5 18.8 4.37 25.28 10 37.6 4.13 24.66 15 56.4 4.16 24.75 20 75.2 4.29 25.09 25 94 4.28 25.05 30 112.8 3.72 23.49 35 131.6 3.77 23.64 40 150.4 3.88 23.95 45 169.2 3.60 23.14 50 188 3.75 23.58 55 206.8 3.69 23.40 60 225.6 3.60 23.12 65 244.4 3.69 23.41 70 263.2 3.82 23.78 75 282 3.89 24.00 80 300.8 3.89 24.00 85 319.6 3.95 24.15 90 338.4 3.88 23.97 95 357.2 3.94 24.13 100 376 3.72 23.49 105 394.8 4.08 24.51 110 413.6 3.95 24.16 115 432.4 4.26 25.00 120 451.2 3.69 23.40 125 470 4.18 24.79 130 488.8 4.28 25.05 135 507.6 3.92 24.07 140 526.4 4.05 24.44 145 545.2 4.53 25.67 150 564 4.20 24.85 155 582.8 4.03 24.39 160 601.6 4.25 24.97 165 620.4 4.04 24.42 170 639.2 4.14 24.68 175 658 4.10 24.57 180 676.8 4.24 24.95 185 695.6 4.09 24.54 190 714.4 4.22 24.89 195 733.2 4.48 25.55 200 752 4.63 25.93