Abstract:
Part of the NOAA Paleoclimatology Program dataset is the Barbados Sea Level and Th/U 14C Calibration. Barbados data are from Fairbanks (1989) and Bard et al. (1990) - the reference works below - or are new data not yet deescribed in the reference documents. All 14C measurements were made in the Lamont radiocarbon laboratory by Guy Mathieu unless otherwise indicated. Data for Porities asteroides ... (Pa) samples from Barbados are listed, but they are not used in the sea level reconstruction. The Porities asteroides (Pa) data provide lower limits for sea level during the last glacial maximum. Sample 12-30-2 is located below a subaerial exposure surface capping an older reef. Data for other Caribbean islands are from the compilation of Lighty et al. (1982). 14Cc kyr is the reservoir corrected age computed by subtracting 0.4 kyr from the 14C age. Depth (m)c indicates uplift corrected depth using a mean uplift rate of 34 cm/kyr (Fairbanks,1989) and the 14Cc age. In the future, the corrected depth will be based upon Th/U age estimates once the Th/U age dates are completed on the remaining samples. Replicate 14C measurements were averaged for the purpose of plotting the sea level curve and for estimating the uplift correction of individual samples. The exceptions are samples 7-12-2, 7-13- 1, 9-27-5 which had initial age dates out of stratigraphic sequence. These samples were redated and the new age dates are stratigraphically consistent.
*14C measured at Geochron Lab., Cambridge, Massachusetts. **14C measured at Gif-sur-Yvette, France by AMS (Bard et al., 1990). ***14C measured at ETH Zurich, Switzerland by AMS (Bard et al., 1990). ****14C measured at University of Arizona, Tuscon, Arizona by AMS.
Note: E. Bard presented two regression equations to describe the relationship between 14-C and Th/U ages at the 4th International Congress on Paleoceanography (Kiel, 1992): linear relationship: 'true age'=1.24(14-C age) - 840 polynomial relationship: 'true age'=-5.85x10^-6(14-C age)^2 + 1.39(14-C age) - 1807
Quality
The 'version 004' or 'collection 004' product is better than 'version 003' and earlier versions. The quality of this version 004 product is ... established as 'Validated' . This means its accuracy has been assessed over a widely distributed set of locations and time periods via several ground-truth and validation efforts. Results are peer-reviewed and published at scientific conferences and workshops.For the latest information please see: http://modis-atmos.gsfc.nasa.gov/products_calendar_overview.html.
Access Constraints
Available to public to gain familiarity with the data format and parameters.
Use Constraints
This Data set (version 004/collection 004) is of 'Validated' Quality. This data is appropriate for use in scientific publications. Before using it in any publication please the contact science team representative for the known problems and updates.
Laboratorie d'Optique Atmospherique
Bat. P5, U.S.T. deLille
Villeneuve d'Ascq Cedex
Postal Code:
59655
Country:
FRANCE
Publications/References
Chu, D. A., K. Strabala, S. Platnick, E. Moody, M. King, S. Mattoo, R. Hucek, and B. Ridgway, 2000: MODIS Atmosphere QA Plan. Version 2.2 ,NASA Goddard Space Flight Center, 46 pp.
Chu, D. A., Y. J. Kaufman, L. A. Remer, and B. N. Holben,1998: Remote sensing of smoke from MODIS ... Airborne Simulator during SCAR-B experiment. Journal of Geophysical Research, 103, 31979-31988.
Gao, B.-C., and Y. J. Kaufman, 1995: Selection of the 1.375-m MODIS channelfor remote sensing of cirrus clouds and stratospheric aerosols from space, J. Atm. Sci., 52, 4231-4237.
Kaufman, Y. J., and D. Tanre,1998: Algorithm For Remote Sensing of Tropospheric Aerosol from MODIS,Algorithm Theoretical Basis Document, ATBD-MOD-02, NASA Goddard Space Flight Center,85 pp.
Kaufman, Y. J., and D. Tanre,1997: MODIS Aerosol Product, in MTPE EOS Data Products Handbook,107-108.
Kaufman, Y. J., and R. S. Fraser, 1997: The effect of smoke particles on cloudsand climate forcing. Science, 277, 1636-1639.
Kaufman, Y. J., D. Tanre, L. Remer, E. F.Vermote, A. Chu, & B. N. Holben, 1997: Operational remote sensing of tropospheric aerosol over the land from EOS-MODIS. Journal of Geophysical Research, 102(14), 17051-17068.
King, M., Y. Kaufman, P. Menzel, D.Tanre, B. Gao, 1999: MODIS Atmosphere Validation Plan, NASA Goddard Space Flight Center, 48 pp.
King, M. D., W. P. Menzel, P. S. Grant, J. S. Myers, G. T. Arnold, S. E. Platnick, L. E.Gumley, S. C. Tsay, C. C. Moeller, M. Fitzgerald, K. S. Brown and F. G.Osterwisch, 1996: Airborne scanning spectrometer for remote sensing of cloud, aerosol, water vapor and surface properties. J. Atmos. Oceanic Technol.,13, 777–794.
Remer, L. A., Y. J. Kaufman, and B. N. Holben, 1996: The size distribution of ambient aerosol particles: Smoke vs. urban/industrial aerosol. Global biomass burning. Cambridge MA: MIT Press.
Tanre, D., Y. J. Kaufman, M. Herman, and S. Mattoo, 1997: Remote sensing of aerosol properties over oceans using the MODIS/EOS spectral radiances. Journal of Geophysical Research, 102, 16971-16988.
Tanre, D., M. Herman, and Y. J. Kaufman, 1996: Information on aerosol size distribution contained in solar reflected radiances. Journal of Geophysical Research-Atmospheres, 101, 19043-19060.
