Ogasawara Coral Winter Sr/Ca and U/Ca Data and PDO Reconstruction Felis, T.; Suzuki, A.; Kuhnert, H.; Rimbu, N.; Kawahata, H. Felis, T. Suzuki, A. Kuhnert, H. Rimbu, N. Kawahata, H. Atmospheric and Oceanic Circulation Patterns Reconstruction Pacific Decadal Oscillation earth science/paleoclimate/corals and sclerosponges (strontium/calcium,Porites sp.,null,millimole per mole,Nov-Feb,corals and sclerosponges,averaged|interpolated,inductively-coupled plasma mass spectrometry,N,null) earth science/paleoclimate/corals and sclerosponges (uranium/calcium,Porites sp.,null,micromole per mole,Nov-Feb,corals and sclerosponges,averaged|interpolated,inductively-coupled plasma mass spectrometry,N,null) earth science/paleoclimate/climate reconstructions|corals and sclerosponges|paleoceanography (Pacific Decadal Oscillation Index,null,null,standard deviation unit,Nov-Feb,climate reconstructions|corals and sclerosponges|paleoceanography,detrended,null,N,detrended over length of record; reconstruction predictors are coral strontium/calcium and coral uranium/calcium and geoduck growth rate) earth science/paleoclimate/climate reconstructions|corals and sclerosponges (age,null,null,year Common Era,null,climate reconstructions|corals and sclerosponges,null,null,N,null) earth science/paleoclimate/corals and sclerosponges (Miyanohama (Chichijima) Reef>LATITUDE 27.1>LONGITUDE 142.2) The Pacific Decadal Oscillation (PDO), the leading mode of sea surface temperature (SST) anomalies in the extratropical North Pacific Ocean, has widespread impacts on precipitation in the Americas and marine fisheries in the North Pacific. However, marine proxy records with a temporal resolution that resolves interannual to interdecadal SST variability in the extratropical North Pacific are extremely rare. Here we demonstrate that the winter Sr/Ca and U/Ca records of an annually-banded reef coral from the Ogasawara Islands in the western subtropical North Pacific are significantly correlated with the instrumental winter PDO index over the last century. The reconstruction of the PDO is further improved by combining the coral data with an existing eastern mid-latitude North Pacific growth ring record of geoduck clams. The spatial correlations of this combined index with global climate fields suggest that SST proxy records from these locations provide potential for PDO reconstructions further back in time. STUDY NOTES: We generated an index of reconstructed Pacific Decadal Oscillation (PDO) variability by combining the November-December-January-February (NDJF) Sr/Ca and U/Ca time series of the Ogasawara coral record (Felis et al., 2009) with a growth index based on geoduck clams (Panopea abrupta) from the Strait of Juan de Fuca (Strom et al., 2004), a coastal site in the eastern midlatitude North Pacific (~48.12°N, 122.95°W, Washington State, northwest U.S.). The NDJF coral Sr/Ca and U/Ca time series were calculated from the bimonthly resolved coral record as the average of the corresponding November-December (ND) and January-February (JF) values. The NDJF value of a given year (e.g., 1901) includes the ND value of the preceding year (1900). The ring-width index is based on annual growth rings of 6 to 23 geoduck shells, and has been reported to document local SST and PDO variability (Strom et al., 2004). All three time series were detrended and normalized to unit variance over their period of overlap (1873-1994). Then, a coral index was calculated as the average of the detrended and normalized NDJF Sr/Ca and U/Ca time series. Consequently, the coral-geoduck index was derived as the average of this coral index and the detrended and normalized geoduck growth index (Felis et al., 2010). Core OGA-02-1 was drilled vertically through a living Porites coral at Miyanohama on the north coast of Chichijima in the Ogasawara Islands (Japan). The core is without gap over its total length of 1.74 m. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Felis, T. Investigator : Suzuki, A. Investigator : Kuhnert, H. Investigator : Rimbu, N. Investigator : Kawahata, H. 2010-08-06 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/9954 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/felis2010_noaa.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/ogasawara2010pdo.xls https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/felis2010_noaa.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/ogasawara2010pdo.xls English https://www.ncdc.noaa.gov/paleo/study/9954 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/felis2010_noaa.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/ogasawara2010pdo.xls Felis, T., A. Suzuki, H. Kuhnert, N. Rimbu, and H. Kawahata. 2010. Pacific Decadal Oscillation documented in a coral record of North Pacific winter temperature since 1873. Geophys. Res. Lett., 37, L14605, doi:10.1029/2010GL043572. Felis, T., A. Suzuki, H. Kuhnert, M. Dima, G. Lohmann, and H. Kawahata. 2009. Subtropical coral reveals abrupt early-twentieth-century freshening in the western North Pacific Ocean. Geology, Vol. 37, No. 6, pp. 527-530, June 2009. doi:10.1130/G25581A.1 Strom, A.S., R.C. Francis, N.J. Mantua, E.L. Miles, and D.L. Peterson. 2004. North Pacific climate recorded in growth rings of geoduck clams: A new tool for paleoenvironmental reconstruction. Geophysical Research Letters 31:L06206. START YEAR: 1873 AD * END YEAR: 1994 AD 142.2 27.1 142.2 27.1