Mackenzie Delta, NW Canada 220 Year Spring-Summer Temperature Reconstruction Porter, T.J.; Pisaric, M. Porter, T.J. Pisaric, M. Air Temperature Reconstruction PCGL Picea glauca (Moench) Voss white spruce earth science/paleoclimate/climate reconstructions|tree ring (age,null,null,year Common Era,null,climate reconstructions|tree ring,null,null,N,null) earth science/paleoclimate/tree ring (delta 18O,cellulose,null,per mil,null,tree ring,null,null,N,null) earth science/paleoclimate/climate reconstructions|tree ring (minimum surface temperature,delta 18O,null,degree Celsius,Apr-Jul,climate reconstructions|tree ring,null,regression analysis,N,1 standard error = +/- 1.24 deg C; cellulose delta 18O; simple linear regression) earth science/paleoclimate/instrumental (minimum surface temperature,null,null,degree Celsius,Apr-Jul,instrumental,null,null,N,Environment Canada climate data) earth science/paleoclimate/reconstructions (Mackenzie Delta>LATITUDE >LONGITUDE ) High-latitude d18O archives deriving from meteoric water (e.g., tree-rings and ice-cores) can provide valuable information on past temperature variability, but stationarity of temperature signals in these archives depends on the stability of moisture source/trajectory and precipitation seasonality, both of which can be affected by atmospheric circulation changes. A tree-ring d18O record (AD 1780-2003) from the Mackenzie Delta is evaluated as a temperature proxy based on linear regression diagnostics. The primary source of moisture for this region is the North Pacific and, thus, North Pacific atmospheric circulation variability could potentially affect the tree-ring d18O-temperature signal. Over the instrumental period (AD 1892-2003), tree-ring d18O explained 29% of interannual variability in April-July minimum temperatures, and the explained variability increases substantially at lower-frequencies. A split-period calibration/verification analysis found the d18O-temperature relation was time-stable, which supported a temperature reconstruction back to AD 1780. The stability of the d18O-temperature signal indirectly implies the study region is insensitive to North Pacific circulation effects, since North Pacific circulation was not constant over the calibration period. Simulations from the NASA-GISS ModelE isotope-enabled general circulation model confirm that meteoric d18O and precipitation seasonality in the study region are likely insensitive to North Pacific circulation effects, highlighting the paleoclimatic value of tree-ring and possibly other d18O records from this region. Our d18O-based temperature reconstruction is the first of its kind in northwestern North America, and one of few worldwide, and provides a long-term context for evaluating recent climate warming in the Mackenzie Delta region. STUDY NOTES: Spring-summer temperatures since AD 1780 reconstructed from stable oxygen isotope ratios in white spruce tree-rings from the Mackenzie Delta, northwestern Canada. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Porter, T.J. Investigator : Pisaric, M. 2016-11-21 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20930 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/canada/mackenzie2014iso-temp.txt https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/canada/mackenzie2014iso-temp.txt English https://www.ncdc.noaa.gov/paleo/study/20930 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/canada/mackenzie2014iso-temp.txt Trevor J. Porter, Michael F.J. Pisaric, Robert D. Field, Steven V. Kokelj, Thomas W.D. Edwards, Peter deMontigny, Richard Healy, Allegra N. LeGrande2014Spring-summer temperatures since AD 1780 reconstructed from stable oxygen isotope ratios in white spruce tree-rings from the Mackenzie Delta, northwestern CanadaClimate Dynamics423771-78510.1007/s00382-013-1674-3http://link.springer.com/article/10.1007%2Fs00382-013-1674-3 START YEAR: 1780 AD * END YEAR: 2003 AD -135.52 68.12 -132.22 69.13