# 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-nel39b.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: NEL39B Luminescence L14 # Earliest_Year: 1972 # 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 1972 0.451 1973 0.231 1974 0.761 1975 0.311 1976 0.333 1977 0.370 1978 0.265 1979 0.512 1980 0.126 1981 0.655 1982 0.226 1983 0.361 1984 0.195 1985 0.147 1986 0.244 1987 0.076 1988 0.270 1989 0.400 1990 0.381 1991 0.838 1992 0.070 1993 0.137 1994 0.204 1995 0.124 1996 0.186 1997 0.401 1998 0.446 1999 0.188 2000 0.491 2001 0.215 2002 0.286