High Indian Native Heiss

Core/Site name:

Aqaba Cores C18, C19

Country/Region:

Jordan

Elevation:

-1m

Archive:

corals

Species:

Porites sp.

Proxy measurement:

del13C, del 18O

Sampling resolution:

annual

Startyear:

1788 AD

Endyear:

1992 AD

Description:

Site: Aqaba, Jordan, Marine Science Station Reef, cores C18 and C19(29 deg 26' N, 34 deg 58' E) Water Depth 1m.collected 11/01/92 (upper 0-120cm), 11/01/93 (120-320cm)Coral species: Porites sp.In fall 1992 and spring 1993 we drilled an unusual big colony of Poritessp. at the fore-reef at Aqaba. The colony is situated in front of the reefedge of the fringing reef south of the Marine Science Station. The colonygrows from a depth of ca 4.5 m, reaches a height of 3.5 m and a maximumdiameter of approximately 5.5 m. We drilled with a hand held pneumaticdrill powered by compressed air from a Scuba tank. We used a conventional30cm diamond-tipped drill bit and in order to obtain longer cores weconstructed extensions of 100cm each (3 in total). The extensions are madefrom a 17mm diameter steel rod with a screw thread attached either to thecore barrel or another extension. Up to 320 cm long cores in 30cm lengthswith 100% recovery were obtained.The core holes were filled with cement plugs after drilling to preventbioerosion (see Hudson 1981; Winter et al. 1991) .The cores were drilled parallel to the growth axis (perpendicular to thecoral surface). Five cores were extracted from the "big"" Porites sp. atdifferent sides of the colony. Three cores (19, 20, 21) are of 130 cmlength, core 24 (lying SE-side of the colony at an angle of 45°) reached229 cm length, and core 18 (top of the colony) recovered coral skeleton toa total length of 312 cm. For oxygen and carbon isotope analysis core 18 (top of colony) and core 19(horizontal core from the southern side) were selected.Samples for isotopic analyses were treated with 35% hydrogen peroxide for24 hours to remove oxidizable organic material. In addition they wererinsed several times in demineralized water and dried in a stove at 40°C.Small samples to determine the average isotope composition of each yearwere cut with a hand held saw. They were taken along the edge of the coralslabs. The top of LD-bands was chosen as the end (respectively beginning)of an annual band. In all our samples this boundary is sharp and can bedetermined relatively precisely. Each chip was gently powdered in an agatemortar. The samples were reacted with 100% H3PO4 at 75°C in an online,automated carbonate reaction device (Kiel Device) connected to a FinniganMat 252 mass spectrometer. Isotopic ratios were corrected for 17-Ocontribution (Craig 1957) and are reported in permil relative to PDB.Average precision based on duplicate sample analysis and on multipleanalysis of NBS 19 is ±0.04 permil for d13C and ±0.08 permil for d18O."

Data entered by name:

Will Carpenter

Data entered by email:

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Main reference(s):

Heiss, G. A., 1994. Coral reefs in the Red Sea: Growth, production and stable isotopes, GEOMAR Report 32: 1-141.

Data storage link 1:

http://hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:4493626481373831::::P1_STUDY_ID:1854

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k