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  • American Association for the Advancement of Science (AAAS)  (12)
  • 1
    Online Resource
    Online Resource
    Pacific Ocean Heat Content During the Past 10,000 Years
    American Association for the Advancement of Science (AAAS) ; 2013
    In:  Science Vol. 342, No. 6158 ( 2013-11), p. 617-621
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 342, No. 6158 ( 2013-11), p. 617-621
    Abstract: Observed increases in ocean heat content (OHC) and temperature are robust indicators of global warming during the past several decades. We used high-resolution proxy records from sediment cores to extend these observations in the Pacific 10,000 years beyond the instrumental record. We show that water masses linked to North Pacific and Antarctic intermediate waters were warmer by 2.1 ± 0.4°C and 1.5 ± 0.4°C, respectively, during the middle Holocene Thermal Maximum than over the past century. Both water masses were ~0.9°C warmer during the Medieval Warm period than during the Little Ice Age and ~0.65° warmer than in recent decades. Although documented changes in global surface temperatures during the Holocene and Common era are relatively small, the concomitant changes in OHC are large.
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.1240837
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2013
    detail.hit.zdb_id: 128410-1
    detail.hit.zdb_id: 2066996-3
    detail.hit.zdb_id: 2060783-0
    SSG: 11
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  • 2
    Online Resource
    Online Resource
    Deep-Sea Temperature and Ice Volume Changes Across the Pliocene-Pleistocene Climate Transitions
    American Association for the Advancement of Science (AAAS) ; 2009
    In:  Science Vol. 325, No. 5938 ( 2009-07-17), p. 306-310
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 325, No. 5938 ( 2009-07-17), p. 306-310
    Abstract: Earth has undergone profound changes since the late Pliocene, which led to the development [~2.7 million years ago (Ma)] and intensification (~0.9 Ma) of large-scale Northern Hemisphere ice sheets, recorded as transitions in the benthic foraminiferal oxygen isotope (δ 18 O b ) record. Here we present an orbitally resolved record of deep ocean temperature derived from benthic foraminiferal magnesium/calcium ratios from the North Atlantic, which shows that temperature variations are a substantial portion of the global δ 18 O b signal. The record shows two distinct cooling events associated with the late Pliocene (LPT, 2.5 to 3 Ma) and mid-Pleistocene (MPT, 1.2 to 0.85 Ma) climate transitions. Whereas the LPT increase in ice volume is attributed directly to global cooling, the shift to 100,000-year cycles at the MPT is more likely to be a response to an additional change in ice-sheet dynamics.
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.1169938
    RVK:
    TA 1000
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    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2009
    detail.hit.zdb_id: 128410-1
    detail.hit.zdb_id: 2066996-3
    detail.hit.zdb_id: 2060783-0
    SSG: 11
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  • 3
    Online Resource
    Online Resource
    Impact of Antarctic Circumpolar Current Development on Late Paleogene Ocean Structure
    American Association for the Advancement of Science (AAAS) ; 2011
    In:  Science Vol. 332, No. 6033 ( 2011-05-27), p. 1076-1079
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 332, No. 6033 ( 2011-05-27), p. 1076-1079
    Abstract: Global cooling and the development of continental-scale Antarctic glaciation occurred in the late middle Eocene to early Oligocene (~38 to 28 million years ago), accompanied by deep-ocean reorganization attributed to gradual Antarctic Circumpolar Current (ACC) development. Our benthic foraminiferal stable isotope comparisons show that a large δ 13 C offset developed between mid-depth (~600 meters) and deep ( 〉 1000 meters) western North Atlantic waters in the early Oligocene, indicating the development of intermediate-depth δ 13 C and O 2 minima closely linked in the modern ocean to northward incursion of Antarctic Intermediate Water. At the same time, the ocean’s coldest waters became restricted to south of the ACC, probably forming a bottom-ocean layer, as in the modern ocean. We show that the modern four-layer ocean structure (surface, intermediate, deep, and bottom waters) developed during the early Oligocene as a consequence of the ACC.
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.1202122
    RVK:
    TA 1000
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    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2011
    detail.hit.zdb_id: 128410-1
    detail.hit.zdb_id: 2066996-3
    detail.hit.zdb_id: 2060783-0
    SSG: 11
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  • 4
    Online Resource
    Online Resource
    In Search of Paleo-ENSO
    American Association for the Advancement of Science (AAAS) ; 2004
    In:  Science Vol. 304, No. 5668 ( 2004-04-09), p. 219-221
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 304, No. 5668 ( 2004-04-09), p. 219-221
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.1095435
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2004
    detail.hit.zdb_id: 128410-1
    detail.hit.zdb_id: 2066996-3
    detail.hit.zdb_id: 2060783-0
    SSG: 11
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  • 5
    Online Resource
    Online Resource
    Remote and local drivers of Pleistocene South Asian summer monsoon precipitation: A test for future predictions
    American Association for the Advancement of Science (AAAS) ; 2021
    In:  Science Advances Vol. 7, No. 23 ( 2021-06-04)
    Details
    In: Science Advances, American Association for the Advancement of Science (AAAS), Vol. 7, No. 23 ( 2021-06-04)
    Abstract: South Asian precipitation amount and extreme variability are predicted to increase due to thermodynamic effects of increased 21st-century greenhouse gases, accompanied by an increased supply of moisture from the southern hemisphere Indian Ocean. We reconstructed South Asian summer monsoon precipitation and runoff into the Bay of Bengal to assess the extent to which these factors also operated in the Pleistocene, a time of large-scale natural changes in carbon dioxide and ice volume. South Asian precipitation and runoff are strongly coherent with, and lag, atmospheric carbon dioxide changes at Earth’s orbital eccentricity, obliquity, and precession bands and are closely tied to cross-equatorial wind strength at the precession band. We find that the projected monsoon response to ongoing, rapid high-latitude ice melt and rising carbon dioxide levels is fully consistent with dynamics of the past 0.9 million years.
    Type of Medium: Online Resource
    ISSN: 2375-2548
    URL: Article
    DOI: 10.1126/sciadv.abg3848
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2021
    detail.hit.zdb_id: 2810933-8
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  • 6
    Online Resource
    Online Resource
    Antarctic role in Northern Hemisphere glaciation
    American Association for the Advancement of Science (AAAS) ; 2014
    In:  Science Vol. 346, No. 6211 ( 2014-11-14), p. 847-851
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 346, No. 6211 ( 2014-11-14), p. 847-851
    Abstract: When the Antarctic ice sheet began to expand around 3 million years ago, it caused changes in deep ocean circulation, hastening the pace of glaciation in the Northern Hemisphere. Woodard et al. analyzed marine sediments from the northwest Pacific Ocean. A substantial fraction of the sea level fall actually occurred before the Northern Hemispheric ice sheets began to grow rapidly, probably because of continental ice growth in Antarctica. Thus, Antarctic glaciers appear to be more dynamic than anticipated, which has implications for the stability of the Antarctic ice sheet in a warming world. Science , this issue p. 847
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.1255586
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2014
    detail.hit.zdb_id: 128410-1
    detail.hit.zdb_id: 2066996-3
    detail.hit.zdb_id: 2060783-0
    SSG: 11
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  • 7
    Online Resource
    Online Resource
    Interglacial instability of North Atlantic Deep Water ventilation
    American Association for the Advancement of Science (AAAS) ; 2020
    In:  Science Vol. 367, No. 6485 ( 2020-03-27), p. 1485-1489
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 367, No. 6485 ( 2020-03-27), p. 1485-1489
    Abstract: Disrupting North Atlantic Deep Water (NADW) ventilation is a key concern in climate projections. We use (sub)centennially resolved bottom water δ 13 C records that span the interglacials of the last 0.5 million years to assess the frequency of and the climatic backgrounds capable of triggering large NADW reductions. Episodes of reduced NADW in the deep Atlantic, similar in magnitude to glacial events, have been relatively common and occasionally long-lasting features of interglacials. NADW reductions were triggered across the range of recent interglacial climate backgrounds, which demonstrates that catastrophic freshwater outburst floods were not a prerequisite for large perturbations. Our results argue that large NADW disruptions are more easily achieved than previously appreciated and that they occurred in past climate conditions similar to those we may soon face.
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.aay6381
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2020
    detail.hit.zdb_id: 128410-1
    detail.hit.zdb_id: 2066996-3
    detail.hit.zdb_id: 2060783-0
    SSG: 11
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  • 8
    Online Resource
    Online Resource
    The Great Indo-Pacific Communicator
    American Association for the Advancement of Science (AAAS) ; 2010
    In:  Science Vol. 328, No. 5985 ( 2010-06-18), p. 1492-1494
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 328, No. 5985 ( 2010-06-18), p. 1492-1494
    Abstract: A complex ocean current system weaves its way through a network of passages, shallow seas, and deep basins between the Indonesian islands ( 1 ). Every second, this Indonesian Throughflow (ITF) carries ∼15 million m 3 of warm, relatively low-salinity water from the tropical Pacific to the Indian Ocean ( 1 – 3 ). The ITF eventually makes its way to the Atlantic Ocean (see the figure), thus contributing to global ocean circulation ( 1 ). Through complex but poorly understood feedbacks, including heat and water exchange with the atmosphere, the ITF is influenced by and modulates climate in the Indo-Pacific region ( 1 – 4 ). A shift in the climate regimes of the tropical Pacific and Indian oceans in the mid-1970s—perhaps in response to global warming ( 5 )—highlights the possible importance of the ITF and its connection to climate phenomena such as the monsoons, the El Niño-Southern Oscillation (ENSO), and the Indian Ocean Dipole (IOD).
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.1187273
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2010
    detail.hit.zdb_id: 128410-1
    detail.hit.zdb_id: 2066996-3
    detail.hit.zdb_id: 2060783-0
    SSG: 11
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  • 9
    Online Resource
    Online Resource
    Accelerated mafic weathering in Southeast Asia linked to late Neogene cooling
    American Association for the Advancement of Science (AAAS) ; 2023
    In:  Science Advances Vol. 9, No. 13 ( 2023-03-31)
    Details
    In: Science Advances, American Association for the Advancement of Science (AAAS), Vol. 9, No. 13 ( 2023-03-31)
    Abstract: Uplift of Indonesian islands since 4 Ma drove enhanced weathering of ophiolites and contributed to global climate cooling.
    Type of Medium: Online Resource
    ISSN: 2375-2548
    URL: Article
    DOI: 10.1126/sciadv.adf3141
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2023
    detail.hit.zdb_id: 2810933-8
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  • 10
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    Online Resource
    Pacific warm pool subsurface heat sequestration modulated Walker circulation and ENSO activity during the Holocene
    American Association for the Advancement of Science (AAAS) ; 2020
    In:  Science Advances Vol. 6, No. 42 ( 2020-10-16)
    Details
    In: Science Advances, American Association for the Advancement of Science (AAAS), Vol. 6, No. 42 ( 2020-10-16)
    Abstract: Dynamics driving the El Niño–Southern Oscillation (ENSO) over longer-than-interannual time scales are poorly understood. Here, we compile thermocline temperature records of the Indo-Pacific warm pool over the past 25,000 years, which reveal a major warming in the Early Holocene and a secondary warming in the Middle Holocene. We suggest that the first thermocline warming corresponds to heat transport of southern Pacific shallow overturning circulation driven by June (austral winter) insolation maximum. The second thermocline warming follows equatorial September insolation maximum, which may have caused a steeper west-east upper-ocean thermal gradient and an intensified Walker circulation in the equatorial Pacific. We propose that the warm pool thermocline warming ultimately reduced the interannual ENSO activity in the Early to Middle Holocene. Thus, a substantially increased oceanic heat content of the warm pool, acting as a negative feedback for ENSO in the past, may play its role in the ongoing global warming.
    Type of Medium: Online Resource
    ISSN: 2375-2548
    URL: Article
    DOI: 10.1126/sciadv.abc0402
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2020
    detail.hit.zdb_id: 2810933-8
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