2 mm Ocean Sediment Studies

Lloyd Keigwin’s Sargasso Sea study was done using 1 cm core intervals; the Arabian Sea RC2730 percentage G bulloides was calculated using 2 mm core intervals (although slower sedimentation meant that the time intervals were mitigated somewhat.) see http://www.climateaudit.org/?p=898 . G bulloides percentage is interesting a measure of upwelling, but isn’t a proxy for SST. I’m looking for ocean sediment studies done at 2 mm or greater resolution. If anybody notices one, could you please point it out.

Khim et al 2002, Unstable Climate Oscillations during the Late Holocene in the Eastern Bransfield Basin, Antarctic Peninsula, Quaternary Research 58, 234-245 (2002) http://www.climateaudit.org/?p=105

Core A9-EB2. Sedimentation rate 87 cm/1000 yr. Magnetics scanned at 1-cm intervals. Resolution ~12 years.

Alicia Newton, Robert Thunell, and Lowell Stott, 2006. Climate and hydrographic variability in the Indo-Pacific Warm Pool during the last millennium. GEOPHYSICAL RESEARCH LETTERS, VOL. 33, L19710, doi:10.1029/2006GL027234, 2006 http://www.climateaudit.org/?p=858

MD9821-60 (1998) was collected was collected at 5 12.07 S, 117 29.20 E from a water depth of 1185 m. well above the present-day lysocline on. Although the uppermost sediments representing roughly the last 150 years were lost during the coring process, the average Holocene sedimentation rate at this location is well over 100 cm per 1,000 years. The core was sampled continuously at 1 cm intervals, providing a time resolution of less than 10 years.

Poore et al, 2003. Millennial- to century-scale variability in Gulf of Mexico Holocene climate records. PALEOCEANOGRAPHY, 18 1048, doi:10.1029/2002PA000868, 2003. url

RC 12-10 from the western GOM and Gyre 97-6 PC20 from the Louisiana continental slope in the northern GOM (Figure 1). RC12-10: accumulation rate 20 cm/kyr; 1- 2 cm intervals; resolution 50-100 years; top 10 cm crumbled. Gyre 97-6 PC20: accumulation 20 cm/kyr; a cm intervals; resolution 50 years.

Poore, R.Z., T. M. Quinn, and S. Verardo, 2004. Century-scale movement of the Atlantic Intertropical Convergence
Zone linked to solar variability. GEOPHYSICAL RESEARCH LETTERS, VOL. 31, L12214, doi:10.1029/2004GL019940, 2004

MD02 2553) taken from the Pigmy Basin on the continental slope of the northern GOM in the summer of 2002. Sediment samples at 1 cm. REsolution ~30 years.

R.Z. Poore, M.J. Pavich and H.D. Grissino-Mayer 2005. Record of the North American southwest monsoon from Gulf of Mexico sediment cores, Geology 2005 url

MD02-2553 and RC 12-10

Julie N Richey, Richard Z Poore, Benjamin P Flower, Terrence M Quinn, A 1400-year multi-proxy record of climate variability from the Northern Gulf of Mexico url

Pigmy Basin, Gulf of Mexico PBBC-1. sample interval 0.5 cm; sedimentation rate 45 cm/1000 years; resolution 12 years

Rein et al, 2005. “El Nino variability off Peru during the last 20,000 years”‘?, Paleoceanography 20,2005 Data

SO147-106KL (80 km off Lima/Peru;12030S, 7739.80W, 184 m water depth, Figure. Dating model with variable resolution. About 2 years in past millennium

von Rad et al, 1999. A 5000-yr Record of Climate Change in Varved Sediments from the Oxygen Minimum Zone off Pakistan, Northeastern Arabian Sea, Quaternary Research 51, 39″€œ53 (1999)

SO 90-56 KA (from box core SO 90-39KG) taken from the center of the OMZ west of Karachi (24° 509N, 65° 559E; water depth: 695 m). sedimentation rate 1.2-1.5 mm/year. Annual resolution by varve counting.


  1. Gary
    Posted Nov 10, 2006 at 8:14 AM | Permalink

    Not likely to be very many. Bioturbation will mix up the mud in most high sedimentation rate locations and the anoxic basins where there is discernable layering are fairly rare. These cores are an opportunity crying for attention and careful analysis, however. Its a little surprising more hasn’t been done with them.
    A systematic approach to tracking down the data is to find who has sampled cores from particularly interesting sites like the Orca Basin from the inventories of the core repositories (at institutions with stong oceanographic programs such as Woods Hole, Lamont-Doherty Geological Observatory of Columbia University, Graduate School of Oceanography at the University of Rhode Island, just to name three in the northeast US.) and then to contact these individuals. Most likely there has been some selected sampling, but not much otherwise.

  2. jisc
    Posted Nov 10, 2006 at 5:34 PM | Permalink

    The following paper makes reference to 2mm intervals in its core analysis. The paper positions itself as contributing high-resolution marine proxy data for SST, bioproductivity and continental precipitation.

    “El Nino variability off Peru during the last 20,000 years”, Rein et al, Paleoceanography Vol. 20,2005

  3. Steve McIntyre
    Posted Nov 11, 2006 at 12:15 PM | Permalink

    Khim et al 2002 for offshore Antarctica discussed here http://www.climateaudit.org/?p=105 samples at 1 cm intervals in a site with accumulation rate of 87 cm per 1000 years, thus obtaining 11 year resolution as compared to ~18 years for the Arabian Sea G bulloides and about ~52 years for the Sargasso Sea dO!8. It shows a distinct MWP and LIA.

  4. jae
    Posted Nov 14, 2006 at 12:49 PM | Permalink

    This study links Sargasso Sea proxies with several other sediment proxies, as well as to Solar cycles.

  5. Steve Sadlov
    Posted Nov 14, 2006 at 12:57 PM | Permalink

    RE: #4 – You realize, of course, that in the view of the orthodoxy, anything from the Idsos is automatically rejected. CO2 Science is, nonetheless, an interesting source.

  6. jae
    Posted Nov 14, 2006 at 1:56 PM | Permalink

    #5: Yeah, I know, but I have challenged several of the orthodoxy who have castigated the Idsos here to find even one example of where the Idsos have incorrectly summarized a study. So far, no responses. I think they do a good job. I don’t have time to read all the papers and would rather trust the Idsos than something like Realclimate. One would think that someone who is strongly pro AGW

  7. jae
    Posted Nov 14, 2006 at 1:57 PM | Permalink

    Hit the wrong key, I guess: Anyway, one would think that someone who is strongly pro AGW would have a “literature review” similar to the Idsos. Maybe the IPCC serves this purpose?

  8. Dane
    Posted Nov 14, 2006 at 3:06 PM | Permalink

    I have a fair amount of “Raw” data from sediment cores taken from a high altitude lake in France, but the data I was looking at is magnetic inclination, declination, and overall field intensity, so I don’t know how helpful it would be. There is other data in the data set, and the samples were analyzed at 1-2 mm intervals. Let me know if your still interested and I will go find it and try to make it available.

  9. Dane
    Posted Nov 14, 2006 at 3:08 PM | Permalink

    BTW, The data set goes back about 115,000 years.

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