Haukadalsvatn, Iceland 2,000 Year Geochemical Data Geirsdóttir, A.; Miller, G.H.; Thordarson, T.; Olafsdottir, K.B. Geirsdóttir, A. Miller, G.H. Thordarson, T. Olafsdottir, K.B. PAGES 2k Network PAGES Arctic 2k earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (biogenic silica,sediment,null,weight percent,null,paleolimnology,null,spectrophotometry,N,method of Mortlock and Froelich 1989 with 10% Na2CO3) earth science/paleoclimate/paleolimnology (age,null,null,year Common Era,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (organic carbon,sediment,null,weight percent,null,paleolimnology,null,carbon coulometry,N,null) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (Haukadalsvatn>LATITUDE 65.051>LONGITUDE -21.6305) The sediment fill of Haukadalsvatn, a lake in northwest Iceland, preserves a record of environmental change since deglaciation, 13 ka ago. The rapid sedimentation rate over the past 2 ka (ca. 4 m ka-1) provides a high-resolution archive of late Holocene environmental change. Physical and chemical environmental proxies extracted from cores from the Haukadalsvatn sediment fill provide a reconstruction of sub-decadal-scale climate variability in Iceland over the past 2 ka. Over this interval biogenic silica (BSi) reflects warm April-May temperatures, whereas total organic carbon (TOC) peaks represent an increased flux of carbon to the lake from eolian-derived soil erosion following periods of cold summers accompanied by dry, windy winters. The proxy-based temperature reconstructions show a broad interval of warmth through Medieval times, but this warmth is punctuated by multi-decadal cold intervals. The transition into the Little Ice Age occurred in two steps, with initial summer cooling 1250-1300 AD, and a more severe drop in summer temperatures between 1450 and 1500 AD; both are periods of severe explosive volcanism. Multi-decadal patterns of cold and warm conditions have some characteristics of a North Atlantic Oscillation (NAO)-like signal, but instrumental records and proxy-based reconstructions of the NAO index contain little power in the frequencies most strongly expressed in our data set. Although severe soil erosion in Iceland is frequently equated with settlement, our reconstructions indicate that soil erosion began several centuries before settlement, whereas for several centuries after settlement, when summer temperatures were relatively high, there was little or no soil erosion. Only during the transition into and during the Little Ice Age did soil erosion become a major feature of the record. STUDY NOTES: Biogenic silica (BSi) and total organic carbon (TOC) from core GLAD4-HAK03-1B, Haukadalsvatn, West Iceland. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Geirsdóttir, A. Investigator : Miller, G.H. Investigator : Thordarson, T. Investigator : Olafsdottir, K.B. 2008-11-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/6196 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/haukadalsvatn2008.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/haukadalsvatn2008.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/haukadalsvatn2008.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/haukadalsvatn2008.txt English https://www.ncdc.noaa.gov/paleo/study/6196 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/haukadalsvatn2008.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/haukadalsvatn2008.txt Aslaug Geirsdottir, Gifford H. Miller, Thorvaldur Thordarson, Kristin B. Olafsdottir 2009A 2000 year record of climate variations reconstructed from Haukadalsvatn, west IcelandJournal of Paleolimnology41195-11510.1007/s10933-008-9253-zhttp://springer.libdl.ir/article/10.1007/s10933-008-9253-z START YEAR: 2085 cal yr BP * END YEAR: -53 cal yr BP -21.6305 65.051 -21.6305 65.051