High Pacific Reconstruction Evans

Country/Region:

Pacific Sea

Archive:

corals

Proxy measurement:

stable isotopes of oxygen in corals; ring width and density measurements in trees

Sampling resolution:

annual

Startyear:

1590 AD

Endyear:

1990 AD

All uncertainties:

PERIOD OF RECORD: Pac_ssta_instrum: 1856-1990,Pac_ssta_coral: 1800-1990, Pac_ssta_tree: 1590-1990

Description:

We have produced three sets of reconstructed Pacific Basin SSTfield and error estimates, based on three sets of observations.SST anomaly values reconstructed on the basis of proxies aresmall, and the estimated error values are large. Thesereconstructions each use limited data sets consisting of auniform type of proxies (specifically, stable isotopes ofoxygen in corals; ring width and density measurements intrees). The reconstructed SST fields are provided (along withthe analysis based on the instrumental data) as bases forintercomparison of reconstruction methodologies and proxytypes. Such intercomparisons are essential for achieving theultimate future goal: obtaining the best possiblereconstruction based on the most complete data set of theproxies of various kinds.We are grateful to the original proxy data contributors whosesubmissions to the W-DCA made this project possible.(1) Pac_ssta_instrum: Reduced-space, objective analysis ofglobal, historical, 5-degree by 5-degree gridded, ship-based,monthly sea surface temperature anomalies for January 1856 -December 1991 (Kaplan et al., 1998). The analysis of Kaplan etal. (1998) is itself based on the Global Ocean SurfaceTemperature Atlas (Bottomley et al., 1990). The data here arecontributed as annual average anomalies, based on anApril-March year. (e.g. year 1856 is the average anomaly forApril 1856 through March 1857.) Monthly global griddedanalyses are available from the LDEO Data Catalog:http://ingrid.ldeo.columbia.edu/SOURCES/.KAPLAN/.EXTENDED/ Datasource for this reconstruction is the Global Ocean SurfaceTemperature Atlas (Bottomley, 1990).(2) Pac_ssta_coral: reconstruction of Pacific Basin SST fieldbased on thirteen annually averaged coral-derived oxygenisotope time series, using methods described in Evans etal. 2000, 2001b. Input data are available from the W-DCA forPaleoclimatology: (http://www.ngdc.noaa.gov/paleo/coral). Thereconstruction is calibrated and verified using thePac_ssta_instrum dataset described above.(3) Pac_ssta_tree: reconstruction of Pacific Basin SST fieldbased on fifteen tree-ring proxy indicators, using methodsdescribed in Evans et al. 2001a,b. Input data are described inVillalba et al. 2001 and in Evans et al. 2001, and areavailable upon request from M.N. Evans. The reconstruction iscalibrated and verified using the Pac_ssta_instrum datasetdescribed above. Chronostratigraphic information: Coral and tree-ring data age models for input data were assumedfrom the primary literature describing the data: no attempt wasmade to adjust age models provided for proxy data by thescientists who contributed the data.

Data entered by name:

Alvarez-Castro, MC

Data entered by email:

This email address is being protected from spambots. You need JavaScript enabled to view it.

Main reference(s):

Evans, M.N., A. Kaplan and M.A. Cane, 2002, Pacific sea surface temperature field reconstruction from coral delta 18O data using reduced space objective analysis, Paleoceanography, v.17, No. 1, February 2002.

Link to reference 1:

http://rainbow.ldeo.columbia.edu/~alexeyk/Papers/Evans_ea02.pdf

Data storage link 1:

http://hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:1993233601621365::::P1_STUDY_ID:6348

Data storage link 2:

http://markov.ldeo.columbia.edu:81/expert/%28/data/siberia/mevans/WDCA/2001-068/Pac_ssta_coral.cdf%29readCDF/

Comments:

type of proxies: stable isotopes ofoxygen in corals; and ring width and density measurements in treesLatitudes of grid points : 57.5S to 62.5N by 5. N= 25 pointsLongitudes of grid points : 112.5E to 67.5W by 5. N= 37 points

Current dating method:

-- select --

Annual snow acc rate:

-- select --

Category: Ocean2k