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1

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Age and annual coral growth rates of coral sample Abrolhos (2000)

Kuhnert, Henning ; Pätzold, Jürgen ; Hatcher, B G ; [et al.]

PANGAEA

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Publication Date: 2023-06-27

Keywords: Abrolhos; Age; AGE; Australia94; Drill, hydraulic; DRILLHY; Growth rate; Houtman Abrolhos Islands, Wallabi Group; Sampling/drilling corals

Type: Dataset

Format: text/tab-separated-values, 396 data points

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Age and stable isotopes of coral sample Abrolhos (2000)

Kuhnert, Henning ; Pätzold, Jürgen ; Hatcher, B G ; [et al.]

PANGAEA

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Publication Date: 2023-06-27

Keywords: Abrolhos; Age; AGE; Australia94; DISTANCE; Drill, hydraulic; DRILLHY; Houtman Abrolhos Islands, Wallabi Group; Mass spectrometer Finnigan MAT 251; Porites lutea, δ13C; Porites lutea, δ18O; Sampling/drilling corals

Type: Dataset

Format: text/tab-separated-values, 4593 data points

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Stable oxygen isotope record from a high-latitude reef off Western Australia

Kuhnert, Henning ; Pätzold, Jürgen ; Hatcher, B G ; [et al.]

PANGAEA

In: Supplement to: Kuhnert, Henning; Pätzold, Jürgen; Hatcher, B G; Wyrwoll, K-H; Eisenhauer, Anton; Collins, L B; Zhu, Z R; Wefer, Gerold (1999): A 200-year coral stable oxygen isotope record from a high-latitude reef off Western Australia. Coral Reefs, 18(1), 1-12, https://doi.org/10.1007/s003380050147

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Publication Date: 2023-06-27

Description: A core from a coral colony of Porites lutea was analysed for stable oxygen isotopic composition*. A 200-year proxy record of sea surface temperatures from the Houtman Abrolhos Islands off west Australia was obtained from coral delta18O. At 29°S, the Houtman Abrolhos are the southernmost major reef complex of the Indian Ocean. They are located on the path of the Leeuwin Current, a southward flow of warm, tropical water, which is coupled to Indonesian throughflow. Coral delta18O primarily reflects local oceanographic and climatic variability, which is largely determined by spatial variability of the Leeuwin Current. However, coherence between coral delta18O and the current strength itself is relatively weak. Evolutionary spectral and singular spectrum analyses of coral delta18O demonstrate a high variability in spectral composition through time. Oscillations in the 5-7-y, 14-15-y, and quasi-biennial bands reflect teleconnections of local sea surface temperature (SST) to tropical Pacific climate variability. Deviations between local (coral-based) and regional (instrument) SST contain a cyclic component with a period of 15 y. Coral delta18O suggests a rise in SST by 0.6°C since AD 1944, consistent with available instrumental SST records. A long-term warming by 1.4°C since AD 1795 is inferred from the coral record.

Keywords: Abrolhos; Australia94; Drill, hydraulic; DRILLHY; Houtman Abrolhos Islands, Wallabi Group; Sampling/drilling corals

Type: Dataset

Format: application/zip, 2 datasets

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4

Electronic Resource

A 200-year coral stable oxygen isotope record from a high-latitude reef off Western Australia (1999)

Kuhnert, H. ; Pätzold, J. ; Hatcher, B. ; [et al.]

Springer

Coral reefs 18 (1999), S. 1-12

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ISSN: 1432-0975

Keywords: Key words Coral stable isotopes ; Leeuwin current ; Australia

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Geosciences

Notes: Abstract A core from a coral colony of Porites lutea was analysed for stable oxygen isotopic composition*. A 200-year proxy record of sea surface temperatures from the Houtman Abrolhos Islands off west Australia was obtained from coral δ18O. At 29′S, the Houtman Abrolhos are the southernmost major reef complex of the Indian Ocean. They are located on the path of the Leeuwin Current, a southward flow of warm, tropical water, which is coupled to Indonesian throughflow. Coral δ18O primarily reflects local oceanographic and climatic variability, which is largely determined by spatial variability of the Leeuwin Current. However, coherence between coral δ18O and the current strength itself is relatively weak. Evolutionary spectral and singular spectrum analyses of coral δ18O demonstrate a high variability in spectral composition through time. Oscillations in the 5–7-y, 14–15-y, and quasi-biennial bands reflect teleconnections of local sea surface temperature (SST) to tropical Pacific climate variability. Deviations between local (coral-based) and regional (instrument) SST contain a cyclic component with a period of 15 y. Coral δ18O suggests a rise in SST by 0.6 ′C since AD 1944, consistent with available instrumental SST records. A long-term warming by 1.4 ′C since AD 1795 is inferred from the coral record.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s003380050147

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5

Electronic Resource

The Last Interglacial sea level change: new evidence from the Abrolhos islands, West Australia (1996)

Eisenhauer, A. ; Zhu, Z. R. ; Collins, L. B. ; [et al.]

Springer

International journal of earth sciences 85 (1996), S. 606-614

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ISSN: 1437-3262

Keywords: Sea level ; Last interglacial ; Milankovitch ; TIMS-U/Th ; Eem ; Palaeoclimatology ; Abrolhos ; Australia

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract U-series ages measured by thermal ionisation mass spectrometry (TIMS) are reported for a Last Interglacial (LI) fossil coral core from the Turtle Bay, Houtman Abrolhos islands, western Australia. The core is 33.4 m long the top of which is approximately 5 m a.p.s.l. (above present sea level). From the232Th concentrations and the reliability of the U-series ages, two sections in the core can be distinguished. Calculated U/Th ages in core section I (3.3 m a.p.s.l to 11 m b.p.s.l) vary between 124±1.7 ka BP (3.3 m a.p.s.l.) and 132.5±1.8 ka (4 m b.p.s.l., i.e. below present sea level), and those of section II (11–23 m b.p.s.l.) between 140±3 and 214±5 ka BP, respectively. The ages of core section I are in almost perfect chronological order, whereas for section II no clear age-depth relationship of the samples can be recognised. Further assessments based on the ϖ234U(T) criteria reveal that none of the samples of core section II give reliable ages, whereas for core section I several samples can be considered to be moderately reliable within 2 ka. The data of the Turtle Bay core complement and extend our previous work from the Houtman Abrolhos showing that the sea level reached a height of approximately 4 m b.p.s.l at approximately 134 ka BP and a sea level highstand of at least 3.3 m a.p.s.l. at approximately 124 ka BP. Sea level dropped below its present position at approximately 116 ka BP. Although the new data are in general accord with the Milankovitch theory of climate change, a detailed comparison reveals considerable differences between the Holocene and LI sea level rise as monitored relative to the Houtman Abrolhos islands. These observation apparently add further evidence to the growing set of data that the LI sea level rise started earlier than recognised by SPECMAP chronology. A reconciliation of these contradictionary observations following the line of arguments presented by Crowley (1994) are discussed with respect to the Milankovitch theory.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02369014

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6

Electronic Resource

The Last Interglacial sea level change: new evidence from the Abrolhos islands, West Australia (1996)

Eisenhauer, A. ; Zhu, Z. R. ; Collins, L. B. ; [et al.]

Springer

Geologische Rundschau 85 (1996), S. 606-614

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ISSN: 0016-7835

Keywords: Key words Sea level ; Last interglacial ; Milankovitch ; TIMS-U/Th ; Eem ; Palaeoclimatology ; Abrolhos ; Australia

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract U-series ages measured by thermal ionisation mass spectrometry (TIMS) are reported for a Last Interglacial (LI) fossil coral core from the Turtle Bay, Houtman Abrolhos islands, western Australia. The core is 33.4 m long the top of which is approximately 5 m a.p.s.l. (above present sea level). From the 232Th concentrations and the reliability of the U-series ages, two sections in the core can be distinguished. Calculated U/Th ages in core section I (3.3 m a.p.s.l to 11 m b.p.s.l) vary between 124±1.7 ka BP (3.3 m a.p.s.l.) and 132.5±1.8 ka (4 m b.p.s.l., i.e. below present sea level), and those of section II (11–23 m b.p.s.l.) between 140±3 and 214±5 ka BP, respectively. The ages of core section I are in almost perfect chronological order, whereas for section II no clear age–depth relationship of the samples can be recognised. Further assessments based on the ∂234U(T) criteria reveal that none of the samples of core section II give reliable ages, whereas for core section I several samples can be considered to be moderately reliable within 2 ka. The data of the Turtle Bay core complement and extend our previous work from the Houtman Abrolhos showing that the sea level reached a height of approximately 4 m b.p.s.l at approximately 134 ka BP and a sea level highstand of at least 3.3 m a.p.s.l. at approximately 124 ka BP. Sea level dropped below its present position at approximately 116 ka BP. Although the new data are in general accord with the Milankovitch theory of climate change, a detailed comparison reveals considerable differences between the Holocenand LI sea level rise as monitored relative to the Houtman Abrolhos islands. These observation apparently add further evidence to the growing set of data that the LI sea level rise started earlier than recognised by SPECMAP chronology. A reconciliation of these contradictionary observations following the line of arguments presented by Crowley (1994) are discussed with respect to the Milankovitch theory.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s005310050100

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The sensitivity of carbon exchanges in Great Plains grasslands to precipitation variability (2016)

M. D. Petrie, N. A. Brunsell, R. Vargas, S. L. Collins, L. B. Flanagan, N. P. Hanan, M. E. Litvak, A. E. Suyker

Wiley

In: Journal of Geophysical Research JGR - Biogeosciences

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Publication Date: 2016-01-15

Description: In the Great Plains, grassland carbon dynamics differ across broad gradients of precipitation and temperature, yet finer-scale variation in these variables may also affect grassland processes. Despite the importance of grasslands, there is little information on how fine-scale relationships compare between them regionally. We compared grassland C exchanges, energy partitioning and precipitation variability in eight sites in the eastern and western Great Plains using eddy covariance and meteorological data. During our study, both eastern and western grasslands varied between an average net carbon sink and a net source. Eastern grasslands had a moderate vapor pressure deficit (VPD = 0.95 kPa) and high growing season gross primary productivity (GPP = 1010 ± 218 g C m −2 m −2 y −1 ). Western grasslands had a growing season with higher VPD (1.43 kPa) and lower GPP (360 ± 127 g C m −2 m −2 y −1 ). Western grasslands were sensitive to precipitation at daily timescales, whereas eastern grasslands were sensitive at monthly and seasonal timescales. Our results support the expectation that C exchanges in these grasslands differ as a result of varying precipitation regimes. Because eastern grasslands are less influenced by short-term variability in rainfall than western grasslands, the effects of precipitation change are likely to be more predictable in eastern grasslands because the timescales of variability that must be resolved are relatively longer. We postulate increasing regional heterogeneity in grassland C exchanges in the Great Plains in coming decades.

Print ISSN: 0148-0227

Topics: Biology , Geosciences

Published by Wiley on behalf of American Geophysical Union (AGU).

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Arabian carbonate reservoirs: A depositional model of the Arab-D reservoir in Khurais field, Saudi Arabia (2013)

Al-Awwad, S. F., Collins, L. B.

American Association of Petroleum Geologists (AAPG)

In: AAPG Bulletin

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Publication Date: 2013-07-03

Description: The Upper Jurassic Arab Formation in the Arabian Peninsula, the most prolific oil-bearing interval of the world, is a succession of interbedded thick carbonates and evaporites that are defined stratigraphically upsection as the Arab-D, Arab-C, Arab-B, and Arab-A. The Arab-D reservoir is the main reservoir in Khurais field, one of the largest onshore oil fields of the Kingdom of Saudi Arabia. In Khurais field, the Arab-D reservoir is composed of the overlying evaporitic Arab-D Member of the Arab Formation and the underlying upper part of the Jubaila Formation. It contains 11 lithofacies, listed from deepest to shallowest: (1) hardground-capped skeletal wackestone and lime mudstone; (2) intraclast floatstone and rudstone; (3) pelletal wackestone and packstone; (4) stromatoporoid wackestone, packstone, and floatstone; (5) Cladocoropsis wackestone, packstone, and floatstone; (6) Clypeina and Thaumatoporella wackestone and packstone; (7) peloidal packstone and grainstone; (8) ooid grainstone; (9) crypt-microbial laminites; (10) evaporites; and (11) stratigraphically reoccurring dolomite. The Arab-D reservoir lithofacies succession represents shallowing-upward deposition, which, from deepest to shallowest, reflects the following depositional environments: offshore submarine turbidity fans (lithofacies 1 and 2); lower shoreface settings (lithofacies 3); stromatoporoid reef (lithofacies 4); lagoon (lithofacies 5 and 6); shallow subtidal settings (lithofacies 7 and 8); peritidal settings (lithofacies 9); and sabkhas and salinas (lithofacies 10). The depositional succession of the reservoir represents a prograding, shallow-marine, reef-rimmed carbonate shelf that was subjected to common storm abrasion, which triggered turbidites.

Print ISSN: 0149-1423

Electronic ISSN: 0149-1423

Topics: Geosciences