Arid
DOI10.1177/0959683617702230
Holocene climatic change in the Alaskan Arctic as inferred from oxygen-isotope and lake-sediment analyses at Wahoo Lake
Vachula, Richard S.1,2,3; Chipman, Melissa L.4; Hu, Feng Sheng1,4,5
通讯作者Hu, Feng Sheng
来源期刊HOLOCENE
ISSN0959-6836
EISSN1477-0911
出版年2017
卷号27期号:11页码:1631-1644
英文摘要

Despite recent progress in understanding high-latitude climate variability, paleoclimate records are scarce from the Alaskan Arctic. We conducted isotopic and sediment analyses at Wahoo Lake to infer Holocene climate variability in northeastern Alaska. Water O-18 and D values from the lake and its inlet/outlet streams suggest that winter precipitation dominates modern water inputs and that evaporation has limited influence on the lake’s hydrological budget. The isotopic composition of Pisidium exhibits marked variations during the past 11,500 years, with O-18 ranging between -18.7 parts per thousand and -16.2 parts per thousand and C-13 between -7.1 parts per thousand and -2.3 parts per thousand (Vienna Pee Dee Belemnite (VPDB)). Elevated O-18 and sediment composition from 11.5 to 8.9 kcal. BP suggest evaporative O-18 enrichment and arid conditions. Rising lake levels are evidenced by the disappearance of Pisidium and a transition to low-carbonate gyttja ca. 6.3 kcal. BP and by the onset of sediment deposition on an adjacent shelf by 5.3 kcal. BP. These changes coincided with enhanced effective moisture in interior and southern Alaska as inferred from lake-level records and may be related to broad-scale atmospheric circulation changes. In the shelf sediments, carbonate abundance increases markedly at 3.5 kcal. BP, and O-18 increases from -18.0 parts per thousand to -16.5 parts per thousand at 2.1 kcal. BP, possibly resulting from increased temperature and/or summer precipitation. After 2.1 kcal. BP, O-18 fluctuates with an overall decreasing trend to -17.2 parts per thousand at 0.9 kcal. BP. Late-Holocene variations in our O-18 record display coherent patterns with regional glacier fluctuations at centennial to millennial scales, suggesting that O-18 minima were related to a combination of low temperatures and enhanced winter snowfall. Holocene variations in organic matter abundance at Wahoo Lake also show broad similarities to total solar irradiance, implying that suborbital solar variability played a role in modulating regional climate and aquatic productivity.


英文关键词delta C-13 delta O-18 Arctic carbonate isotopes Holocene Pisidium solar irradiance
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000415000900002
WOS关键词CENTRAL BROOKS RANGE ; NORTH-ATLANTIC CLIMATE ; BERING-SEA ; METEORIC PRECIPITATION ; LACUSTRINE CARBONATES ; GLACIER FLUCTUATIONS ; ECOSYSTEM RESPONSES ; SOLAR VARIABILITY ; PAST MILLENNIUM ; WATER ISOTOPES
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/199429
作者单位1.Univ Illinois, Dept Geol, Chicago, IL 60680 USA;
2.Brown Univ, Dept Earth Environm & Planetary Sci, Providence, RI 02912 USA;
3.Brown Univ, Inst Brown Environm & Soc, Providence, RI 02912 USA;
4.Univ Illinois, Program Ecol Evolut & Conservat Biol, Chicago, IL 60680 USA;
5.Univ Illinois, Dept Plant Biol, Chicago, IL 60680 USA
推荐引用方式
GB/T 7714
Vachula, Richard S.,Chipman, Melissa L.,Hu, Feng Sheng. Holocene climatic change in the Alaskan Arctic as inferred from oxygen-isotope and lake-sediment analyses at Wahoo Lake[J],2017,27(11):1631-1644.
APA Vachula, Richard S.,Chipman, Melissa L.,&Hu, Feng Sheng.(2017).Holocene climatic change in the Alaskan Arctic as inferred from oxygen-isotope and lake-sediment analyses at Wahoo Lake.HOLOCENE,27(11),1631-1644.
MLA Vachula, Richard S.,et al."Holocene climatic change in the Alaskan Arctic as inferred from oxygen-isotope and lake-sediment analyses at Wahoo Lake".HOLOCENE 27.11(2017):1631-1644.
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