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Journal articles on the topic 'Ventilation abyssale'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Mirabel, A. P., and N. V. Vakulenko. "On advective model of the ventilated thermocline." Океанология 59, no. 1 (2019): 5–11. http://dx.doi.org/10.31857/s0030-15745915-11.

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A model of an advective thermocline is proposed for the case of continuously stratified Sverdrup circulation with a ventilated layer caused by the divergence of flows in the Ekman layer: an immiscible layer with homogenized vorticity and a layer of abyssal liquid, which applies to anticyclonic gyre waters. The results of calculations for the Atlantic Ocean (region 15-52°N, 00-63°E) made with this model are presented. With an abyssal density of 28.0, the values of the surface density and density of the unventilated layer grow to the north from 24.2 to 27.0 and from 27.8 to 27.9, respectively, w

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2

Lago, Véronique, and Matthew H. England. "Projected Slowdown of Antarctic Bottom Water Formation in Response to Amplified Meltwater Contributions." Journal of Climate 32, no. 19 (2019): 6319–35. http://dx.doi.org/10.1175/jcli-d-18-0622.1.

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Abstract The sinking and recirculation of Antarctic Bottom Water (AABW) are a major regulator of the storage of heat, carbon, and nutrients in the ocean. This sinking is sensitive to changes in surface buoyancy, in particular because of freshening since salinity plays a greater role in determining density at cold temperatures. Acceleration in Antarctic ice-shelf and land-ice melt could thus significantly impact the ventilation of the world’s oceans, yet future projections do not usually include this effect in models. Here we use an ocean–sea ice model to investigate the potential long-term imp

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3

Orsi, Alejandro H., Stanley S. Jacobs, Arnold L. Gordon, and Martin Visbeck. "Cooling and ventilating the Abyssal Ocean." Geophysical Research Letters 28, no. 15 (2001): 2923–26. http://dx.doi.org/10.1029/2001gl012830.

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4

Johnson, Gregory C., Sarah G. Purkey, and John L. Bullister. "Warming and Freshening in the Abyssal Southeastern Indian Ocean*." Journal of Climate 21, no. 20 (2008): 5351–63. http://dx.doi.org/10.1175/2008jcli2384.1.

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Abstract Warming and freshening of abyssal waters in the eastern Indian Ocean between 1994/95 and 2007 are quantified using data from two closely sampled high-quality occupations of a hydrographic section extending from Antarctica northward to the equator. These changes are limited to abyssal waters in the Princess Elizabeth Trough and the Australian–Antarctic Basin, with little abyssal change evident north of the Southeast Indian Ridge. As in previous studies, significant cooling and freshening is observed in the bottom potential temperature–salinity relations in these two southern basins. In

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5

Okazaki, Y., T. Sagawa, H. Asahi, K. Horikawa, and J. Onodera. "Ventilation changes in the western North Pacific since the last glacial period." Climate of the Past 8, no. 1 (2012): 17–24. http://dx.doi.org/10.5194/cp-8-17-2012.

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Abstract. We reconstructed the ventilation record of deep water at 2100 m depth in the mid-latitude western North Pacific over the past 25 kyr from radiocarbon measurements of coexisting planktic and benthic foraminiferal shells in sediment with a high sedimentation rate. The 14C data on fragile and robust planktic foraminiferal shells were concordant with each other, ensuring high quality of the reconstructed ventilation record. The radiocarbon activity changes were consistent with the atmospheric record, suggesting that no massive mixing of old carbon from the abyssal reservoir occurred thro

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Okazaki, Y., T. Sagawa, H. Asahi, K. Horikawa, and J. Onodera. "Ventilation changes in the western North Pacific since the last glacial period." Climate of the Past Discussions 7, no. 4 (2011): 2719–39. http://dx.doi.org/10.5194/cpd-7-2719-2011.

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Abstract. We reconstructed the ventilation record of deep water at 2100 m depth in the mid-latitude western North Pacific over the past 25 kyr from radiocarbon measurements of coexisting planktic and benthic foraminiferal shells in sediment with a high sedimentation rate. The 14C data on fragile and robust planktic foraminiferal shells were concordant with each other, ensuring high quality of the reconstructed ventilation record. The radiocarbon activity changes were consistent with the atmospheric record, suggesting that no massive mixing of old carbon from the abyssal reservoir occurred thro

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7

Van Roekel, Luke P., Taka Ito, Patrick T. Haertel, and David A. Randall. "Lagrangian Analysis of the Meridional Overturning Circulation in an Idealized Ocean Basin." Journal of Physical Oceanography 39, no. 9 (2009): 2175–93. http://dx.doi.org/10.1175/2009jpo4110.1.

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Abstract The Lagrangian ocean model is used as a tool to simulate the response of the basin-scale overturning circulation to spatially variable diapycnal mixing in an idealized ocean basin. The model explicitly calculates the positions, velocities, and tracer properties of water parcels. Owing to its Lagrangian formulation, numerical diffusion is completely eliminated and water parcel pathways and water mass ages can be quantified within the framework of the discrete, advective transit time distribution. To illustrate the ventilation pathways, simulated trajectories were tracked backward in ti

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8

Vreugdenhil, Catherine A., Andrew McC Hogg, Ross W. Griffiths, and Graham O. Hughes. "Adjustment of the Meridional Overturning Circulation and Its Dependence on Depth of Mixing." Journal of Physical Oceanography 46, no. 3 (2016): 731–47. http://dx.doi.org/10.1175/jpo-d-15-0050.1.

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AbstractThe relative roles of advective processes and mixing on the temporal adjustment of the meridional overturning circulation are examined, in particular the effects of mixing in either the abyssal or upper ocean. Laboratory experiments with convectively driven overturning and imposed stirring rates show that the circulation adjusts toward an equilibrium state on time scales governed by mixing in the upper boundary layer region but independent of the mixing rate in the bulk of the interior. The equilibrium state of the stratification is dependent only on the rate of mixing in the boundary

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9

Jenkins, William J., Kathryn L. Elder, Ann P. McNichol, and Karl von Reden. "The Passage of the Bomb Radiocarbon Pulse into the Pacific Ocean." Radiocarbon 52, no. 3 (2010): 1182–90. http://dx.doi.org/10.1017/s0033822200046257.

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We report and compare radiocarbon observations made on 2 meridional oceanographic sections along 150°W in the South Pacific in 1991 and 2005. The distributions reflect the progressive penetration of nuclear weapons-produced 14C into the oceanic thermocline. The changes over the 14 yr between occupations are demonstrably large relative to any possible drift in our analytical standardization. The computed difference field based on the gridded data in the upper 1600 m of the section exhibits a significant decrease over time (approaching 40 to 50‰ in Δ14C) in the upper 200–300 m, consistent with t

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10

Doney, Scott C., and William J. Jenkins. "Ventilation of the Deep Western Boundary Current and Abyssal Western North Atlantic: Estimates from Tritium and3He Distributions." Journal of Physical Oceanography 24, no. 3 (1994): 638–59. http://dx.doi.org/10.1175/1520-0485(1994)024<0638:votdwb>2.0.co;2.

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11

Galbraith, Eric D., and SL Jaccard. "An increase in the ventilation of the abyssal North Pacific Ocean at the end of the last ice age." PAGES news 16, no. 1 (2008): 13–14. http://dx.doi.org/10.22498/pages.16.1.13.

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12

Babagoli Matikolaei, Javad, Abbasali Aliakbari Bidokhti, and Maryam Shiea. "Some aspects of the deep abyssal overflow between the middle and southern basins of the Caspian Sea." Ocean Science 15, no. 2 (2019): 459–76. http://dx.doi.org/10.5194/os-15-459-2019.

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Abstract. The present study investigates the deep gravity current between the middle and southern Caspian Sea basins caused by the density difference of deep waters. Oceanographic data, a numerical model and a dynamic model are used to consider the structure of this Caspian Sea abyssal overflow. The CTD data are obtained from UNESCO, and the three-dimensional COHERENS ocean model results are used to study the abyssal currents in the southern basin of the Caspian Sea. The deep overflow is driven by the density difference, which is mainly owing to the temperature difference, between the middle a

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13

JACOBS, STANLEY S. "Bottom water production and its links with the thermohaline circulation." Antarctic Science 16, no. 4 (2004): 427–37. http://dx.doi.org/10.1017/s095410200400224x.

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For more than a century it has been known that the abyssal basins of the world ocean are primarily occupied by relatively cold and fresh waters that originate in the Southern Ocean. Their distinguishing characteristics are acquired by exposure of surface and shelf waters to ‘ventilation’ by the polar atmosphere and to the melting and freezing of ice over and near the Antarctic continental shelf. Subsequent mixing with deep water over the continental slope results in ‘Bottom Water’ that forms the southern sinking limb of the global ‘Thermohaline Circulation.’ Over recent decades, oceanographers

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14

Meredith, Michael P., Alberto C. Naveira Garabato, Arnold L. Gordon, and Gregory C. Johnson. "Evolution of the Deep and Bottom Waters of the Scotia Sea, Southern Ocean, during 1995–2005*." Journal of Climate 21, no. 13 (2008): 3327–43. http://dx.doi.org/10.1175/2007jcli2238.1.

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Abstract The Southern Ocean hosts the formation of the densest layers of the oceanic overturning circulation and provides a climatically sensitive element of deep ocean ventilation. An oceanographic section across the eastern Scotia Sea occupied in 1995, 1999, and 2005 reveals significant variability in the deep and bottom waters of Southern Ocean origin. Warming (∼0.1°C) of the warm midlayer waters in the Scotia Sea between 1995 and 1999 reversed through to 2005, reflecting changes seen earlier upstream in the Weddell Sea. The volume of deep waters with potential temperature less than 0°C dec

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15

Sarnthein, Michael, Kevin Küssner, Pieter M. Grootes, et al. "Plateaus and jumps in the atmospheric radiocarbon record – potential origin and value as global age markers for glacial-to-deglacial paleoceanography, a synthesis." Climate of the Past 16, no. 6 (2020): 2547–71. http://dx.doi.org/10.5194/cp-16-2547-2020.

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Abstract. Changes in the geometry of ocean meridional overturning circulation (MOC) are crucial in controlling past changes of climate and the carbon inventory of the atmosphere. However, the accurate timing and global correlation of short-term glacial-to-deglacial changes of MOC in different ocean basins still present a major challenge. The fine structure of jumps and plateaus in atmospheric and planktic radiocarbon (14C) concentration reflects changes in atmospheric 14C production, ocean–atmosphere 14C exchange, and ocean mixing. Plateau boundaries in the atmospheric 14C record of Lake Suige

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16

Sarnthein, M., B. Schneider, and P. M. Grootes. "Peak glacial <sup>14</sup>C ventilation ages suggest major draw-down of carbon into the abyssal ocean." Climate of the Past 9, no. 6 (2013): 2595–614. http://dx.doi.org/10.5194/cp-9-2595-2013.

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Abstract. Ice core records demonstrate a glacial–interglacial atmospheric CO2 increase of ~ 100 ppm, while 14C calibration efforts document a strong decrease in atmospheric 14C concentration during this period. A calculated transfer of ~ 530 Gt of 14C-depleted carbon is required to produce the deglacial coeval rise of carbon in the atmosphere and terrestrial biosphere. This amount is usually ascribed to oceanic carbon release, although the actual mechanisms remained elusive, since an adequately old and carbon-enriched deep-ocean reservoir seemed unlikely. Here we present a new, though still fr

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Sarnthein, M., B. Schneider, and P. M. Grootes. "Peak glacial <sup>14</sup>C ventilation ages suggest major draw-down of carbon into the abyssal ocean." Climate of the Past Discussions 9, no. 1 (2013): 925–65. http://dx.doi.org/10.5194/cpd-9-925-2013.

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Abstract. Ice core records demonstrate a glacial-interglacial atmospheric CO2 increase of ~ 100 ppm. A transfer of ~ 530 Gt C is required to produce the deglacial rise of carbon in the atmosphere and terrestrial biosphere. This amount is usually ascribed to oceanic carbon release, although the actual mechanisms remained elusive, since an adequately old and carbon-enriched deep-ocean reservoir seemed unlikely. Here we present a new, though still fragmentary, ocean-wide 14C dataset showing that during the Last Glacial Maximum (LGM) and Heinrich Stadial 1 (HS-1) the 14C age difference between oce

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18

Yi, Liang, Haifeng Wang, Xiguang Deng, Haifan Yuan, Dong Xu, and Huiqiang Yao. "Geochronology and Geochemical Properties of Mid-Pleistocene Sediments on the Caiwei Guyot in the Northwest Pacific Imply a Surface-to-Deep Linkage." Journal of Marine Science and Engineering 9, no. 3 (2021): 253. http://dx.doi.org/10.3390/jmse9030253.

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Seamounts are ubiquitous topographic units in the global ocean, and their effects on local circulation have attracted great research attention in physical oceanography; however, fewer relevant efforts were made on geological timescales in previous studies. The Caiwei (Pako) Guyot in the Magellan Seamounts of the western Pacific is a typical seamount and oceanographic characteristics have been well documented. In this study, we investigate a sediment core by geochronological and geochemical studies to reveal a topography-induce surface-to-bottom linkage. The principal results are as follows: (1

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19

Dunne, John P., Jasmin G. John, Alistair J. Adcroft, et al. "GFDL’s ESM2 Global Coupled Climate–Carbon Earth System Models. Part I: Physical Formulation and Baseline Simulation Characteristics." Journal of Climate 25, no. 19 (2012): 6646–65. http://dx.doi.org/10.1175/jcli-d-11-00560.1.

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Abstract The physical climate formulation and simulation characteristics of two new global coupled carbon–climate Earth System Models, ESM2M and ESM2G, are described. These models demonstrate similar climate fidelity as the Geophysical Fluid Dynamics Laboratory’s previous Climate Model version 2.1 (CM2.1) while incorporating explicit and consistent carbon dynamics. The two models differ exclusively in the physical ocean component; ESM2M uses Modular Ocean Model version 4p1 with vertical pressure layers while ESM2G uses Generalized Ocean Layer Dynamics with a bulk mixed layer and interior isopy

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20

Berlinsky, N. "Hydrological factors of formation of oxygen regime of inland seas." Ukrainian hydrometeorological journal, no. 21 (March 20, 2018): 90–97. http://dx.doi.org/10.31481/uhmj.21.2018.09.

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Introduction. The regularities of the formation and dynamics of the oxygen regime in inland seas - the Black Sea and Caspian, under the influence of natural and anthropogenic factors are estimated. Purpose. One of the features of the Black Sea is the absence of dissolved oxygen in the water below 200 meters depth. A comparison is made between the hydrological conditions of the Black Sea and the Caspian, where the depths are also quite large, but the intensity of vertical exchange is different. In addition, it is necessary to distinguish the reasons for the formation of oxygen deficient i

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21

Yi, Liang, Martín Medina-Elizalde, Liangcheng Tan, et al. "Plio-Pleistocene deep-sea ventilation in the eastern Pacific and potential linkages with Northern Hemisphere glaciation." Science Advances 9, no. 8 (2023). http://dx.doi.org/10.1126/sciadv.add1467.

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Antarctic bottom water (AABW) production is a key factor governing global ocean circulation, and the present disintegration of the Antarctic Ice Sheet slows it. However, its long-term variability has not been well documented. On the basis of high-resolution chemical scanning of a well-dated marine ferromanganese nodule from the eastern Pacific, we derive a record of abyssal ventilation spanning the past 4.7 million years and evaluate its linkage to AABW formation over this period. We find that abyssal ventilation was relatively weak in the early Pliocene and persistently intensified from 3.4 m

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22

Millet, Bruno, William R. Gray, Casimir de Lavergne, and Didier M. Roche. "Oxygen isotope constraints on the ventilation of the modern and glacial Pacific." Climate Dynamics, August 31, 2023. http://dx.doi.org/10.1007/s00382-023-06910-8.

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AbstractChanges in Pacific tracer reservoirs and transports are thought to be central to the regulation of atmospheric CO2 on glacial–interglacial timescales. However, there are currently two contrasting views of the circulation of the modern Pacific; the classical view sees southern sourced abyssal waters upwelling to about 1.5 km depth before flowing southward, whereas the bathymetrically constrained view sees the mid-depths (1–2.5 km) largely isolated from the global overturning circulation and predominantly ventilated by diffusion. Furthermore, changes in the circulation of the Pacific und

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Gunn, Kathryn L., Stephen R. Rintoul, Matthew H. England, and Melissa M. Bowen. "Recent reduced abyssal overturning and ventilation in the Australian Antarctic Basin." Nature Climate Change, May 25, 2023. http://dx.doi.org/10.1038/s41558-023-01667-8.

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AbstractDense water formed near Antarctica, known as Antarctic bottom water (AABW), drives deep ocean circulation and supplies oxygen to the abyssal ocean. Observations show that AABW has freshened and contracted since the 1960s, yet the drivers of these changes and their impact remain uncertain. Here, using observations from the Australian Antarctic Basin, we show that AABW transport reduced by 4.0 Sv between 1994 and 2009, during a period of strong freshening on the continental shelf. An increase in shelf water salinity between 2009 and 2018, previously linked to transient climate variabilit

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Shimada, Keishi, Yujiro Kitade, Shigeru Aoki, et al. "Shoaling of abyssal ventilation in the Eastern Indian Sector of the Southern Ocean." Communications Earth & Environment 3, no. 1 (2022). http://dx.doi.org/10.1038/s43247-022-00445-2.

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AbstractAntarctic Bottom Water formation, which ventilates the abyssal layers of the Southern Ocean, is an integral component of the global ocean meridional overturning circulation. Considering evident freshening and density decreases in the source waters, widespread warming in the Southern Ocean suggests a weakening in the Antarctic Bottom Water supply. We demonstrate that the weakening is robust based on water mass warming in the deep and abyssal layers of the Australian-Antarctic Basin, which remained after removing the southward shift effect of the Southern Antarctic Circumpolar Current Fr

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Hu, Qianwen, Xiaodong Huang, Qinbo Xu, et al. "Parametric Subharmonic Instability of Diurnal Internal Tides in the Abyssal South China Sea." Journal of Physical Oceanography, October 5, 2022. http://dx.doi.org/10.1175/jpo-d-22-0020.1.

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Abstract Internal waves close to the seafloor of abyssal oceans are the key energy suppliers driving near-bottom mixing and the upwelling branches of meridional overturning circulation, but their spatiotemporal variability and intrinsic mechanisms remain largely unclear. In this study, measurements from 10 long-term moorings were used to investigate the internal wave activities in the abyssal South China Sea, which is an important upwelling zone. Strong near-inertial internal waves (NIWs) with current velocity pulses exceeding 5 cm s−1 were observed to dominate the near-bottom internal wave fi

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Monkman, Tatsu, and Malte F. Jansen. "The effect of Southern Ocean topography on the global MOC and abyssal water mass distribution." Journal of Physical Oceanography, October 1, 2024. http://dx.doi.org/10.1175/jpo-d-23-0253.1.

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Abstract We investigate the role of Southern Ocean topography and wind stress in the deep and abyssal ocean overturning and water mass composition using a suite of idealized global ocean circulation models. Specifically, we address how the presence of a meridional ridge in the vicinity of Drake Passage and the formation of an associated Southern Ocean gyre influences the water mass composition of the abyssal cell. Our experiments are carried out using a numerical representation of the global ocean circulation in an idealized two-basin geometry under varying wind-stress and Drake Passage ridge

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Holzer, Mark, Tim DeVries, and Casimir de Lavergne. "Diffusion controls the ventilation of a Pacific Shadow Zone above abyssal overturning." Nature Communications 12, no. 1 (2021). http://dx.doi.org/10.1038/s41467-021-24648-x.

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AbstractMid-depth North Pacific waters are rich in nutrients and respired carbon accumulated over centuries. The rates and pathways with which these waters exchange with the surface ocean are uncertain, with divergent paradigms of the Pacific overturning: one envisions bottom waters upwelling to 1.5 km depth; the other confines overturning beneath a mid-depth Pacific shadow zone (PSZ) shielded from mean advection. Here global inverse modelling reveals a PSZ where mean ages exceed 1400 years with overturning beneath. The PSZ is supplied primarily by Antarctic and North-Atlantic ventilated water

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28

Pavia, Frank J., Shouyi Wang, Jennifer Middleton, Richard W. Murray, and Robert F. Anderson. "Trace Metal Evidence for Deglacial Ventilation of the Abyssal Pacific and Southern Oceans." Paleoceanography and Paleoclimatology 36, no. 9 (2021). http://dx.doi.org/10.1029/2021pa004226.

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Marchal, Olivier, and Ning Zhao. "On the Estimation of Deep Atlantic Ventilation from Fossil Radiocarbon Records. I. Modern Reference Estimates." Journal of Physical Oceanography, March 23, 2021. http://dx.doi.org/10.1175/jpo-d-20-0153.1.

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AbstractRadiocarbon dates of fossil carbonates sampled from sediment cores and the seafloor have been used to infer that deep ocean ventilation during the last ice age was different from today. In this first of paired papers, the time-averaged abyssal circulation in the modern Atlantic is estimated by combining a hydrographic climatology, observational estimates of volume transports, Argo float velocities at 1000 m, radiocarbon data, and geostrophic dynamics. Different estimates of modern circulation, obtained from different prior assumptions about the abyssal flow and different errors in the

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Marchal, Olivier, and Ning Zhao. "On the Estimation of Deep Atlantic Ventilation from Fossil Radiocarbon Records. Part II. (In)consistency with Modern Estimates." Journal of Physical Oceanography, June 7, 2021. http://dx.doi.org/10.1175/jpo-d-20-0314.1.

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AbstractMeasurements of radiocarbon concentration (Δ14C) in fossil biogenic carbonates have been interpreted as reecting a reduced ventilation of the deep Atlantic during the last ice age. Here we evaluate the (in)consistency of an updated compilation of fossil Δ14C data for the last deglaciation with the abyssal circulation in the modern Atlantic. A 14C transport equation, in which the mean velocity field is a modern field estimate and turbulent flux divergence is treated as a random fluctuation, is fitted to deglacial Δ14C records by using recursive weighted least-squares. This approach allo

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Raddatz, J., E. Beisel, M. Butzin, et al. "Variable ventilation ages in the equatorial Indian Ocean thermocline during the LGM." Scientific Reports 13, no. 1 (2023). http://dx.doi.org/10.1038/s41598-023-38388-z.

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AbstractVariations of atmospheric CO2 during the Pleistocene ice-ages have been associated with changes in the drawdown of carbon into the deep-sea. Modelling studies suggest that about one third of the glacial carbon drawdown may not be associated to the deep ocean, but to the thermocline or intermediate ocean. However, the carbon storage capacity of thermocline waters is still poorly constrained. Here we present paired 230Th/U and 14C measurements on scleractinian cold-water corals retrieved from ~ 450 m water depth off the Maldives in the Indian Ocean. Based on these measurements we calcula

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32

Tang, Zheng, Tiegang Li, Zhifang Xiong, Haowen Dang, and Jingteng Guo. "Covariation of Deep Antarctic Pacific Oxygenation and Atmospheric CO2 during the Last 770 kyr." Lithosphere 2022, Special 9 (2022). http://dx.doi.org/10.2113/2022/1835176.

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Abstract We present new geochemical evidence of changes in oxygenation of the deep Antarctic Pacific over the last 770 kyr. Our data are derived from redox-sensitive metals and export production proxies extracted from gravity core ANT34/A2-10 at 4217 m water depth. Our results show that oxygen levels in the deep Antarctic Zone (AZ) varied in line with the release of deeply sequestered remineralized carbon to the atmosphere during glacial–interglacial (G–IG) cycles, with lower oxygen concentrations and more carbon storage during glacial periods. Subsequent reductions in the amount of carbon sto

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33

Waddell, Lindsey M., Ingrid L. Hendy, Theodore C. Moore, and Mitchell W. Lyle. "Ventilation of the abyssal Southern Ocean during the late Neogene: A new perspective from the subantarctic Pacific." Paleoceanography 24, no. 3 (2009). http://dx.doi.org/10.1029/2008pa001661.

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Akhoudas, Camille Hayatte, Jean-Baptiste Sallée, F. Alexander Haumann, et al. "Ventilation of the abyss in the Atlantic sector of the Southern Ocean." Scientific Reports 11, no. 1 (2021). http://dx.doi.org/10.1038/s41598-021-86043-2.

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AbstractThe Atlantic sector of the Southern Ocean is the world’s main production site of Antarctic Bottom Water, a water-mass that is ventilated at the ocean surface before sinking and entraining older water-masses—ultimately replenishing the abyssal global ocean. In recent decades, numerous attempts at estimating the rates of ventilation and overturning of Antarctic Bottom Water in this region have led to a strikingly broad range of results, with water transport-based calculations (8.4–9.7 Sv) yielding larger rates than tracer-based estimates (3.7–4.9 Sv). Here, we reconcile these conflicting

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35

Zhong, Yi, Yanguang Liu, Jimin Yu, et al. "Bipolar Seesaw of Atmospheric CO₂ Between North Pacific and Southern Ocean at Millennial Timescales." Geophysical Research Letters 52, no. 13 (2025). https://doi.org/10.1029/2025gl115758.

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AbstractThe interhemispheric relation of deep‐water ventilation and surface‐ocean productivity may have played a prominent role in past atmospheric CO2 regulation. However, how these processes vary on orbital‐millennial timescales remains poorly understood. Here, we present high‐resolution proxy data and model simulations on the variability of biological productivity and deep water circulation for the abyssal northwestern Pacific Ocean spanning 20–60 kyr. We found that enhanced surface productivity increased during Heinrich Stadials (HS) and long term, caused by intensified westerly winds and

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Zhang, Boer, Marianna Linz, Shantong Sun, and Andrew F. Thompson. "A framework for constraining ocean mixing rates and overturning circulation from age tracers." Journal of Physical Oceanography, May 2, 2024. http://dx.doi.org/10.1175/jpo-d-23-0162.1.

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Abstract The age of seawater refers to the amount of the time that has elapsed since that water encountered the surface. This age measures the ventilation rate of the ocean, and the spatial distribution of age can be influenced by multiple processes, such as the overturning circulation, ocean mixing, and air-sea exchange. In this work, we aim to gain new quantitative insights about how the ocean’s age tracer distribution reflects the strength of the meridional overturning circulation and diapycnal diffusivity. We propose an integral constraint that relates the age tracer flow across an isopycn

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Sallée, J. B., E. P. Abrahamsen, C. Allaigre, et al. "Southern ocean carbon and heat impact on climate." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 381, no. 2249 (2023). http://dx.doi.org/10.1098/rsta.2022.0056.

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The Southern Ocean greatly contributes to the regulation of the global climate by controlling important heat and carbon exchanges between the atmosphere and the ocean. Rates of climate change on decadal timescales are therefore impacted by oceanic processes taking place in the Southern Ocean, yet too little is known about these processes. Limitations come both from the lack of observations in this extreme environment and its inherent sensitivity to intermittent processes at scales that are not well captured in current Earth system models. The Southern Ocean Carbon and Heat Impact on Climate pr

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