TY - JOUR T1 - In situ cosmogenic (10)Be production-rate calibration from the Southern Alps, New Zealand RID D-4720-2011 JF - Quaternary Geochronology Y1 - 2010 A1 - Putnam, A. E. A1 - Schaefer, J. M. A1 - Barrell, D. J. A. A1 - Vandergoes, M. A1 - Denton, G. H. A1 - Kaplan, M. R. A1 - Finkel, R. C. A1 - Schwartz, R. A1 - Goehring, B. M. A1 - Kelley, S. E. AB - We present a (10)Be production-rate calibration derived from an early Holocene debris-flow deposit at about 1000 m above sea level in the central Southern Alps, New Zealand, in the mid-latitude Southern Hemisphere. Ten radiocarbon ages on macrofossils from a soil horizon buried by the deposit date the deposit to 9690 +/- 50 calendar years before AD2008. Surface (10)Be concentrations of seven large boulders partially embedded in the stable surface of the deposit are tightly distributed, yielding a standard deviation of similar to 2%. Conversion of the (10)Be measurements to sea level/high-latitude values using each of five standard scaling methods indicates (10)Be production rates of 3.84 +/- 0.08, 3.87 +/- 0.08, 3.83 +/- 0.08, 4.15 +/- 0.09, and 3.74 +/- 0.08 atoms g(-1) a(-1), relative to the '07KNSTD' (10)Be AMS standard, and including only the local time-integrated production-rate uncertainties. When including a sea level high-latitude scaling uncertainty the overall error is similar to 2.5% (1 sigma) for each rate. To test the regional applicability of this production-rate calibration, we measured (10)Be concentrations in a set of nearby moraines deposited before 18060 +/- 200 years before AD2008. The (10)Be ages are only consistent with minimum-limiting (14)C age data when calculated using the new production rates. This also suggests that terrestrial in situ cosmogenic-nuclide production did not change significantly from Last Glacial Maximum to Holocene time in New Zealand. Our production rates agree well with those of a recent calibration study from northeastern North America, but are 12-14% lower than other commonly adopted values. The production-rate values presented here can be used elsewhere in New Zealand for rock surfaces exposed during or since the last glacial period. (C) 2009 Elsevier B.V. All rights reserved. VL - 5 IS - 4 N1 - id: 2031; PT: J; UT: WOS:000280946500002 JO - In situ cosmogenic (10)Be production-rate calibration from the Southern Alps, New Zealand RID D-4720-2011 ER - TY - JOUR T1 - In situ cosmogenic Be-10 production-rate calibration from the Southern Alps, New Zealand JF - QUATERNARY GEOCHRONOLOGY Y1 - 2010 A1 - Putnam, A. E. A1 - Schaefer, J. M. A1 - Barrell, D. J. A. A1 - Vandergoes, M. A1 - Denton, G. H. A1 - Kaplan, M. R. A1 - Finkel, R. C. A1 - Schwartz, R. A1 - Goehring, B. M. A1 - Kelley, S. E. KW - Be-10 KW - C-14 KW - Cosmogenic nuclide KW - Debris flow KW - Holocene KW - Last glacial maximum KW - Moraine KW - Production rate KW - South Island AB - We present a Be-10 production-rate calibration derived from an early Holocene debris-flow deposit at about 1000 m above sea level in the central Southern Alps, New Zealand, in the mid-latitude Southern Hemisphere. Ten radiocarbon ages on macrofossils from a soil horizon buried by the deposit date the deposit to 9690 +/- 50 calendar years before AD2008. Surface Be-10 concentrations of seven large boulders partially embedded in the stable surface of the deposit are tightly distributed, yielding a standard deviation of similar to 2%. Conversion of the Be-10 measurements to sea level/high-latitude values using each of five standard scaling methods indicates Be-10 production rates of 3.84 +/- 0.08, 3.87 +/- 0.08, 3.83 +/- 0.08, 4.15 +/- 0.09, and 3.74 +/- 0.08 atoms g(-1) a(-1), relative to the `07KNSTD' Be-10 AMS standard, and including only the local time-integrated production-rate uncertainties. When including a sea level high-latitude scaling uncertainty the overall error is similar to 2.5% (1 sigma) for each rate. To test the regional applicability of this production-rate calibration, we measured Be-10 concentrations in a set of nearby moraines deposited before 18060 +/- 200 years before AD2008. The Be-10 ages are only consistent with minimum-limiting C-14 age data when calculated using the new production rates. This also suggests that terrestrial in situ cosmogenic-nuclide production did not change significantly from Last Glacial Maximum to Holocene time in New Zealand. Our production rates agree well with those of a recent calibration study from northeastern North America, but are 12-14% lower than other commonly adopted values. The production-rate values presented here can be used elsewhere in New Zealand for rock surfaces exposed during or since the last glacial period. (C) 2009 Elsevier B.V. All rights reserved. VL - 5 ER - TY - JOUR T1 - In situ cosmogenic 10Be production-rate calibration from the Southern Alps, New Zealand JF - Quaternary Geochronology Y1 - 2009 A1 - Putnam, A. E. A1 - Schaefer, J. M. A1 - Barrell, D. J. A. A1 - Vandergoes, M. A1 - Denton, G. H. A1 - Kaplan, M. R. A1 - Finkel, R. C. A1 - Schwartz, R. A1 - Goehring, B. M. A1 - Kelley, S. E. N1 - id: 840In pressY JO - In situ cosmogenic 10Be production-rate calibration from the Southern Alps, New Zealand ER - TY - JOUR T1 - A Be-10 chronology of lateglacial and Holocene mountain glaciation in the Scoresby Sund region, east Greenland: implications for seasonality during lateglacial time JF - Quaternary Science Reviews Y1 - 2008 A1 - Kelly, M. A. A1 - Lowell, T. V. A1 - Hall, B. L. A1 - Schaefer, J. M. A1 - Finkel, R. C. A1 - Goehring, B. M. A1 - Alley, R. B. A1 - Denton, G. H. AB - Thirty-eight new cosmogenic (Be-10) exposure ages from the Scoresby Sund region of east Greenland indicate that prominent moraine sets deposited by mountain glaciers date from 780 to 310 yr, approximately during the Little Ice Age, from 11660 to 10 630 yr, at the end of the Younger Dryas cold interval or during Preboreal time, and from 13 010 to 11630 yr, during lateglacial time. Equilibrium line altitudes (ELAs) interpreted from lateglacial to Early Holocene moraines indicate summertime cooling between similar to 3.9 and 6.6 degrees C relative to today's value, much less than the extreme Younger Dryas cooling registered by Greenland ice cores (mean-annual temperatures of similar to 15 degrees C colder than today's value). This apparent discrepancy between paleotemperature records supports the contention that Younger Dryas cooling was primarily a wintertime phenomenon. Be-10 ages of lateglacial and Holocene moraines show that mountain glaciers during the Little Ice Age were more extensive than at any other time since the Early Holocene Epoch. In addition, 10Be ages of lateglacial moraines show extensive reworking of boulders with cosmogenic nuclides inherited from prior periods of exposure, consistent with our geomorphic observations and cosmogenic-exposure dating studies in other Arctic regions. (C) 2008 Elsevier Ltd. All rights reserved. VL - 27 IS - 25-26 N1 - id: 1868; 389XX Times Cited:7 Cited References Count:75Y JO - A Be-10 chronology of lateglacial and Holocene mountain glaciation in the Scoresby Sund region, east Greenland: implications for seasonality during lateglacial time ER - TY - JOUR T1 - Deglacial history of the Ecuadorian Andes and implication for climate variations: Preliminary results JF - Eos Trans. AGU Fall Meeting Supplement Y1 - 2004 A1 - Hall, M. A1 - Rinterknecht, V. R. A1 - Schaefer, J. M. A1 - R, Seager A1 - Greene, A. VL - 85 IS - 47 N1 - id: 1003 ER -