Paleoceanography最新文献_第2页

A State-Dependent Quantification of Climate Sensitivity Based on Paleodata of the Last 2.1 Million Years 基于近210万年古数据的气候敏感性状态依赖量化

Paleoceanography Pub Date : 2017-11-01 DOI: 10.1002/2017PA003190

P. Köhler, L. Stap, A. S. Heydt, B. Boer, R. Wal, J. Bloch‐Johnson

{"title":"A State-Dependent Quantification of Climate Sensitivity Based on Paleodata of the Last 2.1 Million Years","authors":"P. Köhler, L. Stap, A. S. Heydt, B. Boer, R. Wal, J. Bloch‐Johnson","doi":"10.1002/2017PA003190","DOIUrl":"https://doi.org/10.1002/2017PA003190","url":null,"abstract":"The evidence from both data and models indicates that specific equilibrium climate sensitivity S[X] — the global annual mean surface temperature change (ΔTg) as a response to a change in radiative forcing X (ΔR[X]) — is state-dependent. Such a state dependency implies that the best fit in the scatter plot of ΔTg versus ΔR[X] is not a linear regression, but can be some non-linear or even non-smooth function. While for the conventional linear case the slope (gradient) of the regression is correctly interpreted as the specific equilibrium climate sensitivity S[X], the interpretation is not straightforward in the non-linear case. We here explain how such a state-dependent scatter plot needs to be interpreted, and provide a theoretical understanding — or generalization — how to quantify S[X] in the non-linear case. Finally, from data covering the last 2.1 Myr we show that — due to state dependency — the specific equilibrium climate sensitivity which considers radiative forcing of CO2 and land ice sheet (LI) albedo, S[CO2,LI], is larger during interglacial states than during glacial conditions by more than a factor two.","PeriodicalId":19882,"journal":{"name":"Paleoceanography","volume":"32 1","pages":"1102-1114"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/2017PA003190","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48496122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20

Orbital Signals in Carbon Isotopes: Phase Distortion as a Signature of the Carbon Cycle 碳同位素的轨道信号:相位畸变作为碳循环的标志

Paleoceanography Pub Date : 2017-11-01 DOI: 10.1002/2017PA003143

J. Laurin, B. Růžek, M. Giorgioni

{"title":"Orbital Signals in Carbon Isotopes: Phase Distortion as a Signature of the Carbon Cycle","authors":"J. Laurin, B. Růžek, M. Giorgioni","doi":"10.1002/2017PA003143","DOIUrl":"https://doi.org/10.1002/2017PA003143","url":null,"abstract":"Isotopic mass balance models are employed here to study the response of carbon isotope composition (δ13C) of the ocean-atmosphere system to amplitude-modulated perturbations on Milankovitch time scales. We identify a systematic phase distortion, which is inherent to a leakage of power from the carrier precessional signal to the modulating eccentricity terms in the global carbon cycle. The origin is partly analogous to the simple cumulative effect in sinusoidal signals, reflecting the residence time of carbon in the ocean-atmosphere reservoir. The details of origin and practical implications are, however, different. In amplitude-modulated signals, the deformation is manifested as a lag of the 405 kyr eccentricity cycle behind amplitude modulation (AM) of the short (~100 kyr) eccentricity cycle. Importantly, the phase of AM remains stable during the carbon cycle transfer, thus providing a reference framework against which to evaluate distortion of the 405 kyr term. The phase relationships can help to (1) identify depositional and diagenetic signatures in δ13C and (2) interpret the pathways of astronomical signal through the climate system. The approach is illustrated by case studies of Albian and Oligocene records using a new computational tool EPNOSE (Evaluation of Phase in uNcertain and nOisy SEries). Analogous phase distortions occur in other components of the carbon cycle including atmospheric CO2 levels; hence, to fully understand the causal relationships on astronomical time scales, paleoclimate models may need to incorporate realistic, amplitude-modulated insolation instead of monochromatic sinusoidal approximations. Finally, detection of the lagged δ13C response can help to reduce uncertainties in astrochronological age models that are tuned to the 405 kyr cycle.","PeriodicalId":19882,"journal":{"name":"Paleoceanography","volume":"32 1","pages":"1236-1255"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/2017PA003143","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44454496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Combined Effects of Atmospheric and Seafloor Iron Fluxes to the Glacial Ocean 大气和海底铁通量对冰川海的综合影响

Paleoceanography Pub Date : 2017-11-01 DOI: 10.1002/2016pa003077

J. Muglia, C. Somes, L. Nickelsen, A. Schmittner

{"title":"Combined Effects of Atmospheric and Seafloor Iron Fluxes to the Glacial Ocean","authors":"J. Muglia, C. Somes, L. Nickelsen, A. Schmittner","doi":"10.1002/2016pa003077","DOIUrl":"https://doi.org/10.1002/2016pa003077","url":null,"abstract":"Changes in the ocean iron cycle could help explain the low atmospheric CO2 during the Last Glacial Maximum (LGM). Previous modeling studies have mostly considered changes in aeolian iron fluxes, although it is known that sedimentary and hydrothermal fluxes are important iron sources for today's ocean. Here we explore effects of preindustrial-to-LGM changes in atmospheric dust, sedimentary, and hydrothermal fluxes on the ocean's iron and carbon cycles in a global coupled biogeochemical-circulation model. Considering variable atmospheric iron solubility decreases LGM surface soluble iron fluxes compared with assuming constant solubility. This limits potential increases in productivity and export production due to surface iron fertilization, lowering atmospheric CO2 by only 4 ppm. The effect is countered by a decrease in sedimentary flux due to lower sea level, which increases CO2 by 15 ppm. Assuming a 10 times higher iron dust solubility in the Southern Ocean, combined with changes in sedimentary flux, we obtain an atmospheric CO2 reduction of 13 ppm. The high uncertainty in the iron fluxes does not allow us to determine the net direction and magnitude of variations in atmospheric CO2 due to changes in the iron cycle. Our model does not account for changes to iron-binding ligand concentrations that could modify the results. We conclude that when evaluating glacial-interglacial changes in the ocean iron cycle, not only surface but also seafloor fluxes must be taken into account.","PeriodicalId":19882,"journal":{"name":"Paleoceanography","volume":"32 1","pages":"1204-1218"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/2016pa003077","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44336113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 21

Sensitivity of the Greenland Ice Sheet to interglacial climate forcing: MIS 5e Versus MIS 11 格陵兰冰盖对间冰期气候强迫的敏感性：MIS 5e与MIS 11

Paleoceanography Pub Date : 2017-11-01 DOI: 10.1002/2017PA003149

R. Rachmayani, M. Prange, D. Lunt, E. Stone, M. Schulz

{"title":"Sensitivity of the Greenland Ice Sheet to interglacial climate forcing: MIS 5e Versus MIS 11","authors":"R. Rachmayani, M. Prange, D. Lunt, E. Stone, M. Schulz","doi":"10.1002/2017PA003149","DOIUrl":"https://doi.org/10.1002/2017PA003149","url":null,"abstract":"The Greenland Ice Sheet (GrIS) is thought to have contributed substantially to high global sea levels during the interglacials of Marine Isotope Stage (MIS) 5e and 11. Geological evidence suggests that the mass loss of the GrIS was greater during the peak interglacial of MIS 11 than MIS 5e, despite a weaker boreal summer insolation. We address this conundrum by using the three-dimensional thermomechanical ice-sheet model Glimmer forced by CCSM3 climate model output for MIS 5e and MIS 11 interglacial time slices. Our results suggest a stronger sensitivity of the GrIS to MIS 11 climate forcing than to MIS 5e forcing. Besides stronger greenhouse gas radiative forcing, the greater MIS 11 GrIS mass loss relative to MIS 5e is attributed to a larger oceanic heat transport towards high latitudes by a stronger Atlantic meridional overturning circulation. The vigorous MIS 11 ocean overturning, in turn, is related to a stronger wind-driven salt transport from low to high latitudes promoting North Atlantic Deep Water formation. The orbital insolation forcing, which causes the ocean current anomalies, is discussed.","PeriodicalId":19882,"journal":{"name":"Paleoceanography","volume":"32 1","pages":"1089-1101"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/2017PA003149","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48616007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Did Photosymbiont Bleaching Lead to the Demise of Planktic Foraminifer Morozovella at the Early Eocene Climatic Optimum? 在始新世早期气候最适宜时期，光共生体白化是否导致了浮游有孔虫Morozovella的灭绝?

Paleoceanography Pub Date : 2017-11-01 Epub Date: 2017-11-06 DOI: 10.1002/2017PA003138

Valeria Luciani, Roberta D'Onofrio, Gerald R Dickens, Bridget S Wade

{"title":"Did Photosymbiont Bleaching Lead to the Demise of Planktic Foraminifer Morozovella at the Early Eocene Climatic Optimum?","authors":"Valeria Luciani, Roberta D'Onofrio, Gerald R Dickens, Bridget S Wade","doi":"10.1002/2017PA003138","DOIUrl":"https://doi.org/10.1002/2017PA003138","url":null,"abstract":"The symbiont-bearing mixed-layer planktic foraminiferal genera Morozovella and Acarinina were among the most important calcifiers of early Paleogene tropical-subtropical oceans. A marked and permanent switch in the abundance of these genera is known to have occurred at low-latitude sites at the beginning of the Early Eocene Climatic Optimum (EECO), such that the relative abundance of Morozovella permanently and significantly decreased along with a progressive reduction in the number of species; concomitantly, the genus Acarinina almost doubled its abundance and diversified. Here we examine planktic foraminiferal assemblages and stable isotope compositions of their tests at Ocean Drilling Program Site 1051 (northwest Atlantic) to detail the timing of this biotic event, to document its details at the species level, and to test a potential cause: the loss of photosymbionts (bleaching). We also provide stable isotope measurements of bulk carbonate to refine the stratigraphy at Site 1051 and to determine when changes in Morozovella species composition and their test size occurred. We demonstrate that the switch in Morozovella and Acarinina abundance occurred rapidly and in coincidence with a negative carbon isotope excursion known as the J event (~53 Ma), which marks the start of the EECO. We provide evidence of photosymbiont loss after the J event from a size-restricted δ13C analysis. However, such inferred bleaching was transitory and also occurred in the acarininids. The geologically rapid switch in planktic foraminiferal genera during the early Eocene was a major evolutionary change within marine biota, but loss of photosymbionts was not the primary causal mechanism.","PeriodicalId":19882,"journal":{"name":"Paleoceanography","volume":"32 11","pages":"1115-1136"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/2017PA003138","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35791442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

The Role of Uncertainty in Estimating Lead/Lag Relationships in Marine Sedimentary Archives: A Case Study From the Tropical Pacific 不确定性在估算海洋沉积档案中铅/滞后关系中的作用:以热带太平洋为例

Paleoceanography Pub Date : 2017-11-01 DOI: 10.1002/2016PA003057

D. Khider, Seonmin Ahn, L. Lisiecki, C. Lawrence, M. Kienast

{"title":"The Role of Uncertainty in Estimating Lead/Lag Relationships in Marine Sedimentary Archives: A Case Study From the Tropical Pacific","authors":"D. Khider, Seonmin Ahn, L. Lisiecki, C. Lawrence, M. Kienast","doi":"10.1002/2016PA003057","DOIUrl":"https://doi.org/10.1002/2016PA003057","url":null,"abstract":"Understanding the mechanisms behind any changes in the climate system often requires establishing the timing of events imprinted on the geological record. However, these proxy records are prone to large uncertainties, which may preclude meaningful conclusions about the relative timing of events. In this study, we put forth a framework to estimate the uncertainty in phase relationships inferred from marine sedimentary records. The novelty of our method lies in the accounting of the various sources of uncertainty inherent to paleoclimate reconstruction and timing analysis. Specifically, we use a Monte-Carlo process allowing sampling of possible realizations of the time series as functions of uncertainties in time, the climate proxy, and the identification of the termination timing. We then apply this technique to 15 published sea surface temperature records from the equatorial Pacific to evaluate whether we observed any significant changes in the termination timing between the East and the West. We find that the uncertainty on the relative timing estimates is on the order of several thousand years, and mainly stems from age model uncertainty (90%). However, even small differences in mean termination timings can be detected with a sufficiently large number of samples. Improvements in the dating of sediment records provide an opportunity to reduce uncertainty in studies of this kind.","PeriodicalId":19882,"journal":{"name":"Paleoceanography","volume":"32 1","pages":"1275-1290"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/2016PA003057","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45765480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Relationships Between Temperature, pH, and Crusting on Mg/Ca Ratios in Laboratory‐Grown Neogloboquadrina Foraminifera 温度、pH值和结壳对实验室培养的新舌形有孔虫Mg/Ca比值的影响

Paleoceanography Pub Date : 2017-11-01 DOI: 10.1002/2017PA003111

C. V. Davis, J. Fehrenbacher, T. Hill, A. Russell, H. Spero

{"title":"Relationships Between Temperature, pH, and Crusting on Mg/Ca Ratios in Laboratory‐Grown Neogloboquadrina Foraminifera","authors":"C. V. Davis, J. Fehrenbacher, T. Hill, A. Russell, H. Spero","doi":"10.1002/2017PA003111","DOIUrl":"https://doi.org/10.1002/2017PA003111","url":null,"abstract":"Author(s): Davis, CV; Fehrenbacher, JS; Hill, TM; Russell, AD; Spero, HJ | Abstract: ©2017. American Geophysical Union. All Rights Reserved. Mg/Ca ratio paleothermometry in foraminifera is an important tool for the reconstruction and interpretation of past environments. However, existing Mg/Ca:temperature relationships for planktic species inhabiting middle- and high-latitude environments are limited by a lack of information about the development and impact of low-Mg/Ca ratio “crusts” and the influence of the carbonate system on Mg/Ca ratios in these groups. To address this, we cultured individual specimens of Neogloboquadrina incompta and Neogloboquadrina pachyderma in seawater across a range of temperature (6°–12°C) and pH (7.4–8.2). We found by laser ablation inductively couple mass spectrometry analyses of shells that culture-grown crust calcite in N. incompta had a lower Mg/Ca ratio than ontogenetic calcite formed at the same temperature, suggesting that temperature is not responsible for the low-Mg/Ca ratio of neogloboquadrinid crusts. The Mg/Ca:temperature relationship for ontogenetic calcite in N. incompta was consistent with the previously published culture-based relationship, and no significant relationship was found between Mg/Ca ratios and pH in this species. However, the Mg/Ca ratio in laboratory-cultured N. pachyderma was much higher than that reported in previous core top and sediment trap samples, due to lack of crust formation in culture. Application of our ontogenetic calcite-specific Mg/Ca:temperature relationships to fossil N. pachyderma and N. incompta from five intervals in cores from the Santa Barbara Basin and the Bering Sea shows that excluding crust calcite in fossil specimens may improve Mg/Ca-based temperature estimates.","PeriodicalId":19882,"journal":{"name":"Paleoceanography","volume":"32 1","pages":"1137-1152"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/2017PA003111","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41697331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 21

Reconstructing past seasonal to multi-centennial scale variability in the NE Atlantic Ocean using the long-lived marine bivalve mollusc Glycymeris glycymeris 利用长寿的海洋双壳类软体动物甘氨酸甘油酯重建东北大西洋过去的季节到百年尺度变化

Paleoceanography Pub Date : 2017-10-05 DOI: 10.1002/2017PA003154

D. Reynolds, I. Hall, Sarah A. Slater, J. Scourse, P. Halloran, M. Sayer

{"title":"Reconstructing past seasonal to multi-centennial scale variability in the NE Atlantic Ocean using the long-lived marine bivalve mollusc Glycymeris glycymeris","authors":"D. Reynolds, I. Hall, Sarah A. Slater, J. Scourse, P. Halloran, M. Sayer","doi":"10.1002/2017PA003154","DOIUrl":"https://doi.org/10.1002/2017PA003154","url":null,"abstract":"The lack of long-term, highly resolved (annual to sub-annual) and absolutely dated baseline records of marine variability extending beyond the instrumental period (last ~50-100 years) hinders our ability to develop a comprehensive understanding of the role the ocean plays in the climate system. Specifically, without such records, it remains difficult to fully quantify the range of natural climate variability mediated by the ocean, and to robustly attribute recent changes to anthropogenic or natural drivers. Here we present a 211-year (1799-2010 CE; all dates hereafter are common era) seawater temperature (SWT) reconstruction from the northeast Atlantic Ocean derived from absolutely dated, annually resolved, oxygen isotope ratios recorded in the shell carbonate (δ18Oshell) of the long-lived marine bivalve mollusc Glycymeris glycymeris. The annual record was calibrated using sub-annually resolved δ18Oshell values drilled from multiple shells covering the instrumental period. Calibration verification statistics and spatial correlation analyses indicate that the δ18Oshell record contains significant skill at reconstructing Northeast Atlantic Ocean mean summer SWT variability associated with changes in sub-polar gyre (SPG) dynamics and the North Atlantic Current. Reconciling differences between the δ18Oshell data and corresponding growth increment width chronology demonstrates that 68% of the variability in G. glycymeris shell growth can be explained by the combined influence of biological productivity and SWT variability. These data suggest G. glycymeris can provide seasonal to multi-centennial absolutely dated baseline records of past marine variability that will lead to the development of a quantitative understanding of the role the marine environment plays in the global climate system.","PeriodicalId":19882,"journal":{"name":"Paleoceanography","volume":"32 1","pages":"1153-1173"},"PeriodicalIF":0.0,"publicationDate":"2017-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/2017PA003154","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43954220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 22

Coherent response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation during the last deglaciation: reconciling contrasting neodymium isotope reconstructions from the tropical Atlantic 末次消冰期间南极中水和大西洋经向翻转环流的相干响应:调和来自热带大西洋的对比钕同位素重建

Paleoceanography Pub Date : 2017-10-01 DOI: 10.1002/2017PA003092

Sifan Gu, Zhengyu Liu, Jiaxu Zhang, J. Rempfer, F. Joos, D. Oppo

{"title":"Coherent response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation during the last deglaciation: reconciling contrasting neodymium isotope reconstructions from the tropical Atlantic","authors":"Sifan Gu, Zhengyu Liu, Jiaxu Zhang, J. Rempfer, F. Joos, D. Oppo","doi":"10.1002/2017PA003092","DOIUrl":"https://doi.org/10.1002/2017PA003092","url":null,"abstract":"Antarctic Intermediate Water (AAIW) plays important roles in the global climate system and the global ocean nutrient and carbon cycles. However, it is unclear how AAIW responds to global climate changes. In particular, neodymium isotopic composition (eNd) reconstructions from different locations from the tropical Atlantic, have led to a debate on the relationship between northward penetration of AAIW into the tropical Atlantic and the Atlantic Meridional Overturning Circulation (AMOC) variability during the last deglaciation. We resolve this controversy by studying the transient oceanic evolution during the last deglaciation using a neodymium-enabled ocean model. Our results suggest a coherent response of AAIW and AMOC: when AMOC weakens, the northward penetration and transport of AAIW decreases while its depth and thickness increase. Our study highlights that as part of the return flow of the North Atlantic Deep Water (NADW), the northward penetration of AAIW in the Atlantic is determined predominately by AMOC intensity. Moreover, the inconsistency among different tropical Atlantic eNd reconstructions is reconciled by considering their corresponding core locations and depths, which were influenced by different water masses in the past. The very radiogenic water from the bottom of the Gulf of Mexico and the Caribbean Sea, which was previously overlooked in the interpretations of deglacial eNd variability, can be transported to shallow layers during active AMOC, and modulates eNd in the tropical Atlantic. Changes in the AAIW core depth must also be considered. Thus, interpretation of eNd reconstructions from the tropical Atlantic is more complicated than suggested in previous studies.","PeriodicalId":19882,"journal":{"name":"Paleoceanography","volume":"32 1","pages":"1036-1053"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/2017PA003092","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43187768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 23

Variability of Indonesian Throughflow and Borneo Runoff During the Last 14 kyr 过去14年来印度尼西亚通流和婆罗洲径流的变化

Paleoceanography Pub Date : 2017-10-01 DOI: 10.1002/2016PA003030

M. Hendrizan, W. Kuhnt, A. Holbourn

{"title":"Variability of Indonesian Throughflow and Borneo Runoff During the Last 14 kyr","authors":"M. Hendrizan, W. Kuhnt, A. Holbourn","doi":"10.1002/2016PA003030","DOIUrl":"https://doi.org/10.1002/2016PA003030","url":null,"abstract":"We present a high-resolution (~20 to 100 years temporal resolution) reconstruction of hydrological changes in the Makassar Strait over the last 14 kyr from Core SO217-18517 retrieved off the Mahakam Delta (1°32.198′S, 117°33.756′E; 698 m water depth) during the SO217 Makassar-Java Cruise. Sea surface temperatures, based on Mg/Ca of Globigerinoides ruber and alkenone UK′37, and seawater δ18O reconstructions, based on G. ruber δ18O and Mg/Ca, in combination with sortable silt grain size measurements and X-ray fluorescence (XRF) core scanner derived elemental data provide evidence for increased precipitation during the Bolling-Allerod (BA) and early Holocene and for warmer and more saline surface waters and a decrease in the intensity of the Indonesian Throughflow (ITF) during the Younger Dryas (YD). XRF derived Log (Zr/Rb) records, sortable silt data and increased sedimentation rates indicate decreased winnowing, interpreted as a slowdown of the ITF thermocline flow during the YD. We attribute this decline in ITF intensity to slowdown of the Atlantic meridional overturning circulation during the YD. We suggest that changes in Makassar Strait surface hydrology during this interval of Northern Hemisphere cooling and Southern Hemisphere warming were related to a southward displacement of the Intertropical Convergence Zone.","PeriodicalId":19882,"journal":{"name":"Paleoceanography","volume":"32 1","pages":"1054-1069"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/2016PA003030","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47112636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16