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					Arolik and Ongoke Lake, Alaska Biogenic Silica Data
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            World Data Center for Paleoclimatology, Boulder
                            and
                 NOAA Paleoclimatology Program
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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)
Arolik Age   Arolik 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
          Ongoke
Ongoke AgeYrBP 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

				
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