Pacific sea surface temperature field reconstruction from coral delta O-18 data using reduced space objective analysis

Publication Type  Journal Article
Year of Publication  2002
Authors  Evans, M. N.; Kaplan, A.; Cane, M. A.
Journal Title  Paleoceanography
Volume  17
Issue  1
Pages  -
Journal Date  Feb
ISBN Number  0883-8305
Accession Number  ISI:000175990500007
Key Words  objective analysis; enso; sea surface temperature; proxy; coral; stable-isotope record; southern-oscillation; climate data; variability; enso; patterns; pressure; trends; level

[1] A systematic methodology for the reconstruction of climate fields from sparse observational networks of proxy data, employing the technique of reduced space objective analysis, is applied to the reconstruction of gridded Pacific Ocean Basin sea surface temperature (SST) from coral stable isotope (delta(18)O) data for the period 1607-1990. In this approach we seek to reconstruct only the leading modes of large-scale variability which are both observed in the modern climate and resolved in the proxy data. We find that the coral data verifiably resolve two spatial patterns of SST variability. The first and dominant pattern is that of the El Nino-Southern Oscillation (ENSO). A second pattern reflects uniform changes over most of the Pacific Basin. Calibration and verification tests for 1856-1990 show that root-mean-square variance is small (less than or equal to0.5degreesC RMS) and reconstruction errors are large (less than or equal to0.6degreesC RMS), limiting interpretation to the tropical region. Periods of enhanced ENSO activity similar to those observed in the past two decades are evident in the reconstruction for the early nineteenth century. The changing frequency of ENSO warm phase events appears to coincide with warming of the Pacific mean state inferred from similar reconstruction efforts using tree ring indicators over the last two centuries.


558WQTimes Cited:15Cited References Count:52

URL  <Go to ISI>://000175990500007
DOI  Doi 10.1029/2000pa000590