Arolik and Ongoke Lake, Alaska Biogenic Silica Data ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Arolik and Ongoke Lake, Alaska Biogenic Silica Data LAST UPDATE: 3/2009 (Original receipt by WDC Paleo) CONTRIBUTORS: Feng Sheng Hu, David M. Nelson, Gina H. Clarke, Kathleen M. Rühland, Yongsong Huang, Darrell S. Kaufman, and John P. Smol IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2009-023 WDC PALEO CONTRIBUTION SERIES CITATION: Hu, F.S., et al. 2009. Arolik and Ongoke Lake, Alaska Biogenic Silica Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2009-023. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Hu, F.S., D.M. Nelson, G.H. Clarke, K.M. Rühland, Y. Huang, D.S. Kaufman, and J.P. Smol. 2006. Abrupt climatic events during the last glacial-interglacial transition in Alaska. Geophys. Res. Lett., 33, L18708, doi:10.1029/2006GL027261 ABSTRACT: Evidence is mounting that abrupt climatic shifts occurred during the last glacial-interglacial transition (LGIT) in the North Atlantic and other regions. However, few high- resolution climatic records of the LGIT exist from the high latitudes of the North Pacific rim. We analyzed lake sediments from southwestern Alaska for biogenic silica, organic carbon, organic nitrogen, diatom assemblages, and compound-specific hydrogen isotopes. Results reveal climatic changes coincident with the Younger Dryas, Intra- Allerød Cold Period, and Pre-Boreal Oscillation. However, major discrepancies exist in the paleoclimate patterns of the Bølling-Allerød interstadial between our data and the GISP2 d18O record from Greenland, and causes are uncertain. These data suggest that the North Pacific and North Atlantic experienced similar reversals during climatic warming of the LGIT but that the Bølling-Allerød cooling trend in the GISP2 d18O record is probably not a hemispheric or global pattern. GEOGRAPHIC REGION: Northern North America PERIOD OF RECORD: 16 - 10.5 KYrBP FUNDING SOURCES: US National Science Foundation (NSF) ATM 9996064 and 0318404 to FSH, and EAR 9808593 to D.K.) and NSERC (to J.P.S.) grants. DESCRIPTION: Raw biogenic silica measurements from Arolik and Ongoke Lake sediments, spanning ~16,000 to 10,500 calendar year BP. Biogenic Silica in mg per g of dry sediment. Ages reported as calibrated years before present. Arolik and Ongoke age models based on 9 and 5 calibrated AMS radiocarbon dates (respectively), all from terrestrial macrofossils. See publication for more details. Arolik Lake (59°28'N, 161°07'W, 145 m above sea level) Ongoke Lake (59°15'N, 159°25'W, 200 m above sea level) DATA: 1. Arolik Lake Raw biogenic silica Column 1: Age, calibrated years before present Column 2: Biogenic Silica (mg per g of dry sediment) Age BSi 10475 198 10521 218 10567 189 10614 228 10660 205 10706 207 10752 231 10798 226 10844 222 10890 282 10936 286 10981 249 11027 223 11072 219 11118 206 11163 187 11208 168 11254 170 11299 183 11344 177 11388 165 11433 159 11478 201 11522 191 11567 184 11611 186 11655 190 11700 166 11744 146 11788 125 11832 164 11875 170 11919 154 11962 159 12006 145 12049 164 12092 168 12136 151 12179 124 12221 104 12264 136 12307 88 12349 97 12392 90 12434 101 12476 82 12518 85 12560 103 12602 82 12644 91 12685 79 12727 73 12768 72 12892 141 12932 179 12973 169 13014 140 13054 95 13095 85 13135 68 13175 173 13215 207 13255 199 13294 197 13334 197 13373 212 13413 213 13452 226 13491 234 13530 214 13569 181 13607 171 13646 144 13684 141 13723 143 13761 129 13799 124 13837 146 13874 136 13912 140 13949 124 13987 129 14024 116 14061 116 14098 123 14135 103 14171 73 14208 109 14244 95 14281 99 14317 81 14353 89 14388 95 14424 83 14460 108 14495 99 14530 150 14566 111 14601 108 14636 97 14670 84 14705 100 14739 107 14774 95 14808 89 14842 85 14876 83 14910 91 14943 87 14977 86 15010 88 15044 82 15077 69 15110 66 15143 78 15175 55 15305 84 15433 72 15464 78 15496 63 15527 74 15558 55 15589 59 15620 65 15651 60 15681 72 15712 58 15742 70 15773 61 15803 68 15833 66 15863 70 15892 70 15922 78 15952 62 15981 73 16010 59 2. Ongoke Lake Raw biogenic silica Column 1: Age, calibrated years before present Column 2: Biogenic Silica (mg per g of dry sediment) Age BSi 10497 275 10540 251 10583 299 10626 263 10670 316 10713 313 10757 322 10800 319 10844 330 10888 319 10932 296 10977 283 11021 267 11066 266 11111 287 11155 230 11200 255 11246 228 11291 244 11336 220 11359 246 11382 227 11404 269 11427 246 11450 243 11473 242 11496 264 11519 243 11542 237 11565 245 11588 258 11611 247 11634 261 11657 247 11680 256 11703 260 11726 258 11749 232 11773 258 11796 232 11819 255 11842 234 11866 227 11889 233 11912 220 11936 197 11959 167 11983 165 12007 177 12031 188 12055 203 12080 204 12104 195 12129 166 12154 184 12179 181 12204 178 12229 168 12254 188 12280 166 12305 169 12331 133 12357 140 12382 138 12408 160 12434 161 12461 159 12487 153 12513 158 12539 95 12566 100 12592 169 12618 168 12645 161 12671 141 12698 149 12725 151 12751 148 12778 151 12805 136 12831 179 12858 164 12885 194 12911 189 12938 203 12965 201 12991 161 13018 216 13044 217 13071 222 13097 241 13124 215 13150 221 13177 185 13203 188 13229 123 13255 151 13281 148 13307 178 13333 158 13359 183 13385 173 13411 193 13436 172 13462 177 13487 164 13512 183 13537 147 13562 179 13587 166 13612 198 13636 174 13661 184 13685 171 13709 172 13733 149 13757 163 13781 170 13804 199 13827 173 13850 173 13873 171 13896 186 13918 164 13941 173 13963 154 13985 177 14006 167 14028 167 14049 126 14070 110 14091 111 14111 126 14131 94 14151 73 14171 63 14191 67 14211 66 14230 75 14250 76 14270 88 14289 80 14309 100 14328 105 14348 109 14367 107 14386 86 14406 88 14425 104 14444 90 14463 94 14482 97 14520 86 14558 102 14596 85 14634 110 14671 96 14708 107 14746 116 14782 104 14819 97 14856 106 14892 87 14928 98 14964 79 15000 89 15036 69 15072 49 15107 54 15142 46 15177 47 15212 76 15247 79 15282 55 15316 61 15350 56 15385 50 15418 42 15452 62 15486 67 15519 67 15553 62 15586 47 15619 59 15652 40 15684 46 15717 42 15749 46 15781 41 15813 49 15845 40 15877 42 15909 56 15940 57 15971 51 16003 44 16034 42 16064 52 16095 47