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  • 1
    Online Resource
    Online Resource
    Isotopic Characterization of Water Masses in the Southeast Pacific Region: Paleoceanographic Implications
    American Geophysical Union (AGU) ; 2022
    In:  Journal of Geophysical Research: Oceans Vol. 127, No. 1 ( 2022-01)
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 127, No. 1 ( 2022-01)
    Abstract: The first biogeochemical and spatial characterization of δ 18 O, δD, and δ 13 C DIC from coastal water masses in the Southeast Pacific (SEP) The upper 1,000 m between the open ocean and coastal regions show strong differences in water mass chemistry and geometry Coastal data provide information that can aid in reconstructions of past ocean conditions in the SEP
    Type of Medium: Online Resource
    ISSN: 2169-9275 , 2169-9291
    URL: Article
    DOI: 10.1029/2021JC017525
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2022
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  • 2
    Online Resource
    Online Resource
    Simulating the global distribution of nitrogen isotopes in the ocean : NITROGEN ISOTOPES IN THE GLOBAL OCEAN
    American Geophysical Union (AGU) ; 2010
    In:  Global Biogeochemical Cycles Vol. 24, No. 4 ( 2010-12), p. n/a-n/a
    Details
    In: Global Biogeochemical Cycles, American Geophysical Union (AGU), Vol. 24, No. 4 ( 2010-12), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0886-6236
    URL: Article
    DOI: 10.1029/2009GB003767
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2010
    detail.hit.zdb_id: 2021601-4
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    The California Current of the Last Glacial Maximum: Reconstruction at 42°N based on multiple proxies
    American Geophysical Union (AGU) ; 1997
    In:  Paleoceanography Vol. 12, No. 2 ( 1997-04), p. 191-205
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 12, No. 2 ( 1997-04), p. 191-205
    Abstract: Multiple paleoceanographic proxies in a zonal transect across the California Current near 42°N record modern and last glacial maximum (LGM) thermal and nutrient gradients. The offshore thermal gradient, derived from foraminiferal species assemblages and oxygen isotope data, was similar at the LGM to that at present (warmer offshore), but average temperatures were 3.3° ±1.5°C colder. Observed gradients require that the sites remained under the southward flow of the California Current, and thus that the polar front remained north of 42°N during the LGM. Carbon isotopic and foraminiferal flux data suggests enhanced nutrients and productivity of foraminfera in the northern California Current up to 650 km offshore. In contrast, marine organic carbon and coastal diatom burial rates decreased during the LGM. These seemingly contradictory results are reconciled by model simulations of the LGM wind‐ field, which suggest that wind stress curl at 42°N (and thus open‐ocean upwelling) increased, while offshore Ekman transport (and thus coastal upwelling) decreased during the last ice age. The ecosystem of the northern California Current during the LGM approximated that of the modern Gulf of Alaska. Cooling and production in this region was thus driven by stronger open‐ocean upwelling and/or southward flow of high‐latitude water masses, rather than by coastal upwelling.
    Type of Medium: Online Resource
    ISSN: 0883-8305 , 1944-9186
    URL: Article
    DOI: 10.1029/96PA03165
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1997
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  • 4
    Online Resource
    Online Resource
    Testing the effects of tropical temperature, productivity, and mixed‐layer depth on foraminiferal transfer functions
    American Geophysical Union (AGU) ; 1998
    In:  Paleoceanography Vol. 13, No. 1 ( 1998-02), p. 96-105
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 13, No. 1 ( 1998-02), p. 96-105
    Abstract: Statistical transfer functions relate living planktonic foraminiferal species of the central equatorial Pacific to measured sea surface temperature, integrated primary productivity, and mixed‐layer depth. The faunal estimates successfully reconstruct latitudinal patterns observed in both warm (El Niño, February–March 1992) and cool (La Niña, August–September 1992) seasonal settings. Predictions of mixed‐layer depth appear to be unbiased by temperature or productivity in our data set but tend to underestimate deep mixed layers. Interactions between productivity and temperature, perhaps through their common influence on respiration and growth rates, bias foraminiferal transfer functions for both properties. Paleoceanographic estimates may be improved by accounting for such biological processes that translate the environment into a faunal response preserved in the geologic record.
    Type of Medium: Online Resource
    ISSN: 0883-8305 , 1944-9186
    URL: Article
    DOI: 10.1029/97PA02904
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1998
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  • 5
    Online Resource
    Online Resource
    Diffuse spectral reflectance as a proxy for percent carbonate content in North Atlantic sediments
    American Geophysical Union (AGU) ; 1999
    In:  Paleoceanography Vol. 14, No. 2 ( 1999-04), p. 171-186
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 14, No. 2 ( 1999-04), p. 171-186
    Abstract: Diffuse reflectance records from Feni Drift in the North Atlantic faithfully record sediment percent carbonate. A high‐resolution, reflectance‐based age model for these sediments derived from an orbitally tuned age model for western equatorial Atlantic, Ceara Rise sediments was generated by spectral frequency mapping. Power spectra of the Feni Drift record indicate statistically significant sub‐Milankovitch cyclicity at 7.6–8.4 and 4.8–6.1 kyr. We infer that these ∼8 and ∼5 kyr cycles document a linkage between North and equatorial Atlantic climate given our ability to correlate these records. These climate cycles influence Atlantic basin carbonate prior to the intensification of Northern Hemisphere glaciation and thus must arise from some portion of the climate system other than the dynamics of large ice sheets. The presence of these peaks, which could be related to equatorial clipped precession, implies a possible non‐linear response to Milankovitch forcing.
    Type of Medium: Online Resource
    ISSN: 0883-8305 , 1944-9186
    URL: Article
    DOI: 10.1029/1998PA900021
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1999
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  • 6
    Online Resource
    Online Resource
    Benthic foraminiferal δ 18 O in the ocean's temperature‐salinity‐density field: Constraints on Ice Age thermohaline circulation
    American Geophysical Union (AGU) ; 1991
    In:  Paleoceanography Vol. 6, No. 1 ( 1991-02), p. 1-20
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 6, No. 1 ( 1991-02), p. 1-20
    Abstract: Benthic δ 18 O data from 95 core sites are used to infer possible temperature‐salinity (T‐S) fields of the Atlantic and Pacific oceans at the Last Glacial Maximum (LGM). A constraint of stable density stratification yields logically consistent scenarios for both T and S. The solutions are not unique but are useful as a thinking tool. Using GEOSECS data, we solve for the modem relationship between δ 18 O water (δ w ) and salinity in the deep sea: δ w (SMOW) = 1.529 * S ‐ 53.18. As a starting point, we assume that the slope of this equation applies to LGM conditions and predict δ 18 O calcite (δ c ) gradients in equilibrium with probable T‐S fields of LGM deep and bottom waters. Benthic foraminiferal δ 18 O data from the deep Pacific (2–4 km depth), and the bottom Atlantic ( 〉 4 km depth), are 0.1–0.2‰ lower than from the deep Atlantic (2–4 km depth) at the LGM. If the modern δ w ‐S slope applies, Atlantic deep and bottom waters were more dense than Pacific deep waters. This assumption would imply bottom waters both fresher (ΔS 〉 0.5) and colder (ΔT ∼3°C) than overlying deep waters, in conflict with other data, suggesting ice age deep water much colder than at present. It is also possible that the observed δ c gradients are an artifact of laboratory intercalibration. If Atlantic deep and bottom water δ c values were similar to deep Pacific values, this would be consistent with the hypothesis of a stronger southern ocean versus North Atlantic source for deep‐ocean ventilation at the LGM. Taking the observed gradients at face value, however, a solution could be that the LGM δ w ‐S slope in deep and bottom waters was higher than at present, conceivably because of a stronger contribution of salt to the deep ocean via more intense sea ice freezing. This would allow Pacific deep waters and Atlantic bottom waters to have a common source, again in the Antarctic. Both would be more dense than Atlantic deep waters, even though the deep waters were much colder than at present. To better constrain these inferences drawn from the spatial distribution of benthic δ 18 O, we must reduce scatter in the δ 18 O data with more high‐quality measurements in high sedimentation rate cores. This is especially true at bottom water sites. Also, we must intercalibrate mass spectrometers at different isotope laboratories more accurately, to insure our isotope data are compatible.
    Type of Medium: Online Resource
    ISSN: 0883-8305 , 1944-9186
    URL: Article
    DOI: 10.1029/90PA01882
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1991
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  • 7
    Online Resource
    Online Resource
    Late Quaternary paleoceanography of the tropical Atlantic, 2: The seasonal cycle of sea surface temperatures, 0–20,000 years B.P.
    American Geophysical Union (AGU) ; 1986
    In:  Paleoceanography Vol. 1, No. 3 ( 1986-09), p. 339-353
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 1, No. 3 ( 1986-09), p. 339-353
    Abstract: Foraminiferal species abundances are used to estimate seasonal variability of late Quaternary sea surface temperatures in the tropical Atlantic Ocean. Empirical orthogonal functions analysis of 28 time series isolates two patterns (modes) of variation. The dominant mode 1 reflects seasonal temperature contrast of the South Equatorial Current region 5°–6°C higher at the glacial maximum than at present, probably indicating larger seasonal variations of the southern trade winds. Forcing for this pattern may have come from equatorward compression of glacial climate zones due to high‐latitude cooling in both hemispheres and/or suppression of meridional monsoonal circulation via feedback from northern hemisphere ice cover. When compared with CLIMAP estimates of lower seasonal variations of glacial age sea ice fronts in Antarctica, mode 1 suggests decoupling of low‐ and high‐ latitude seasonal cycles in the southern hemisphere on a glacial‐interglacial scale. Mode 2 variations reflect seasonal contrast in sea surface temperature of 2°–3°C less 9000 to 14,000 years B.P. than at present along the equator and in the eastern subtropical Atlantic, perhaps related to an equatorial position of the Intertropical Convergence Zone, weakened trade winds, and/or strengthened monsoonal circulation during deglaciation. Our findings emphasize the need to isolate spatially coherent (and thus dynamically linked) patterns of climate change from a complex record of multiple climatic effects. Only then can effective tests of hypotheses be made with a coupled strategy of data acquisition and climate modeling.
    Type of Medium: Online Resource
    ISSN: 0883-8305 , 1944-9186
    URL: Article
    DOI: 10.1029/PA001i003p00339
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1986
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  • 8
    Online Resource
    Online Resource
    Near collapse of the meridional SST gradient in the eastern equatorial Pacific during Heinrich Stadial 1 : MERIDIONAL SST GRADIENT IN THE EEP
    American Geophysical Union (AGU) ; 2013
    In:  Paleoceanography Vol. 28, No. 4 ( 2013-12), p. 663-674
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 28, No. 4 ( 2013-12), p. 663-674
    Type of Medium: Online Resource
    ISSN: 0883-8305
    URL: Article
    DOI: 10.1002/2013PA002499
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2013
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    SSG: 16,13
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  • 9
    Online Resource
    Online Resource
    Variations of δ 18 O in rainwater from southwestern Oregon
    American Geophysical Union (AGU) ; 2010
    In:  Journal of Geophysical Research Vol. 115, No. D9 ( 2010-05-13)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 115, No. D9 ( 2010-05-13)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2009JD013345
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2010
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    detail.hit.zdb_id: 2220777-6
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    SSG: 16,13
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  • 10
    Online Resource
    Online Resource
    Arctic Ocean chronology confirmed by accelerator 14 C dating
    American Geophysical Union (AGU) ; 1986
    In:  Geophysical Research Letters Vol. 13, No. 4 ( 1986-04), p. 319-321
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 13, No. 4 ( 1986-04), p. 319-321
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/GL013i004p00319
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1986
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    SSG: 16,13
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