# Nelly Bay, Magnetic Island, Australia Mid-Holocene and Modern Coral Luminescence Data and Burdekin River Flow Reconstruction #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite original publication, online resource and date accessed when using these data, # If there is no publication information, please cite investigator, title, online resource and date accessed. # # # Online_Resource: http://hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:::::P1_STUDY_ID:16557 # # Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/corals/west_pacific/lough2014/lough2014-nel29a.txt # # Archive: Corals and Sclerosponges #-------------------- # Contribution_Date # Date: 2014-06-06 #-------------------- # Title # Study_Name: Nelly Bay, Magnetic Island, Australia Mid-Holocene and Modern Coral Luminescence Data and Burdekin River Flow Reconstruction #-------------------- # Investigators # Investigators: Lough, J.M.; Llewellyn, L.E.; Lewis, S.E.; Turney, C.S.M.; Palmer, J.G.; Cook C.G.; Hogg, A.G. #-------------------- # Description_and_Notes # Description: Radiocarbon dating of contiguous decadal-length segments through NEL03D and NEL07B provided an absolutely dated chronology with a calendar age that spans 6223 to 6098 yr BP. # This appears to have been followed by a 60-year gap with NEL01D dated to 6038 to 5918 yr BP. Based on this dating, we assigned Year 0 to the last dated year at the outer edge of # NEL01D (i.e. 5918 yr BP). Allowing for the 60-year gap, the youngest year of NEL07B was assigned Year 188 and the oldest year of NEL03D was assigned Year 313. # Cross-dating of cores also showed that NEL07 died 44 years after NEL03. Thus, we obtained four time # series of coral luminescence from two colonies (NEL03 and NEL07) which could be precisely related to each other and overlapped for 61 years (Years 294 to 234) and a single time series from colony NEL01 for Years 128 to 0. # #-------------------- # Publication # Authors: Lough, J.M., L.E. Llewellyn, S.E. Lewis, C.S.M. Turney, J.G. Palmer, C.G. Cook and A.G. Hogg # Published_Date_or_Year: 2014 # Published_Title: Evidence for suppressed mid-Holocene northeastern Australian monsoon variability from coral luminescence # Journal_Name: Paleoceanography # Volume: 29 # Issue: # Pages: # DOI: 10.1002/2014PA002630 # Abstract: Summer monsoon rainfall in northeastern (NE) Australia exhibits substantial inter-annual variability resulting in highly variable river flows. The occurrence and magnitude of these seasonal river flows are reliably recorded in modern inshore corals as luminescent lines. Here we present reconstructed annual river flows for two ~120-year mid-Holocene windows based on luminescence measurements from five cores obtained from three separate coral colonies. We were able to cross-date the luminescence signatures in four cores from two of the colonies, providing confidence in the derived reconstruction. Present day NE Australian rainfall and river flow are sensitive to El Niņo-Southern Oscillation (ENSO) variability, with La Niņa (El Niņo) events typically associated with wetter (drier) monsoon seasons. Thus, our replicated and annually-resolved coral records provide valuable insights into the northern Australian summer monsoon and ENSO variability at a key period (6?ka) when greenhouse gas levels and ice sheet cover were comparable to the pre-industrial period but orbital forcing was different. Average modern and mid-Holocene growth characteristics were very similar, suggesting that sea surface temperatures off NE Australia at 6ky were also close to present values. The reconstructed river flow record suggests, however, that the mid-Holocene Australian summer monsoon was weaker, less variable from year-to-year (possibly indicative of reduced ENSO variability) and characterised by more within-season flood pulses than present. In contrast to today, the delivery of moisture appears to have been dominated by eastward propagating convective coupled waves associated with the Madden-Julian Oscillation. # #--------------------- # Funding_Agency # Funding_Agency_Name: Australian Institute of Marine Science # Grant: #--------------------- # Funding_Agency # Funding_Agency_Name: Australian Research Council # Grant: FL100100195 #--------------------- # Site_Information # Site_Name: Nelly Bay, Magnetic Island, Queensland, Australia # Location: Western Pacific Ocean # Country: Australia # Northernmost_Latitude: -19.2 # Southernmost_Latitude: -19.2 # Easternmost_Longitude: 146.9 # Westernmost_Longitude: 146.9 # Elevation: #------------------ # Data_Collection # Collection_Name: NEL29A Luminescence L14 # Earliest_Year: 1952 # Most_Recent_Year: 2002 # Time_Unit: AD # Core_Length: # Notes: #------------------ # Chronology: # # # #------------------ # Variables # # Data line variables format: one variable per line, shortname- 9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # Data line format: tab-delimited text, variable short name as header ## age_AD age,,,Year AD,,,,,N ## lumin luminescence,,,luminescence units,,corals and sclerosponges,,,N #----------------- # Data: # Missing Value: age_AD lumin 1952 0.181 1953 0.569 1954 0.666 1955 0.498 1956 0.540 1957 0.390 1958 0.592 1959 0.461 1960 0.392 1961 0.152 1962 0.230 1963 0.447 1964 0.217 1965 0.372 1966 0.234 1967 0.305 1968 0.571 1969 0.195 1970 0.355 1971 0.469 1972 0.540 1973 0.158 1974 0.944 1975 0.372 1976 0.486 1977 0.421 1978 0.316 1979 0.570 1980 0.181 1981 0.513 1982 0.129 1983 0.347 1984 0.363 1985 0.184 1986 0.248 1987 0.214 1988 0.255 1989 0.197 1990 0.387 1991 0.620 1992 0.146 1993 0.226 1994 0.268 1995 0.213 1996 0.115 1997 0.380 1998 0.425 1999 0.190 2000 0.533 2001 0.285 2002 0.354