Gray Alison R.

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Gray
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Alison R.
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  • Article
    Author Correction : Spiraling pathways of global deep waters to the surface of the Southern Ocean
    (Nature Publishing Group, 2018-01-15) Tamsitt, Veronica ; Drake, Henri F. ; Morrison, Adele K. ; Talley, Lynne D. ; Dufour, Carolina O. ; Gray, Alison R. ; Griffies, Stephen M. ; Mazloff, Matthew R. ; Sarmiento, Jorge L. ; Wang, Jinbo ; Weijer, Wilbert
    Correction to: Nature Communications 8:172 https://doi.org/10.1038/s41467-017-00197-0; Article published online: 2 August 2017
  • Article
    Lagrangian timescales of Southern Ocean upwelling in a hierarchy of model resolutions
    (John Wiley & Sons, 2018-01-31) Drake, Henri F. ; Morrison, Adele K. ; Griffies, Stephen M. ; Sarmiento, Jorge L. ; Weijer, Wilbert ; Gray, Alison R.
    In this paper we study upwelling pathways and timescales of Circumpolar Deep Water (CDW) in a hierarchy of models using a Lagrangian particle tracking method. Lagrangian timescales of CDW upwelling decrease from 87 years to 31 years to 17 years as the ocean resolution is refined from 1° to 0.25° to 0.1°. We attribute some of the differences in timescale to the strength of the eddy fields, as demonstrated by temporally degrading high-resolution model velocity fields. Consistent with the timescale dependence, we find that an average Lagrangian particle completes 3.2 circumpolar loops in the 1° model in comparison to 0.9 loops in the 0.1° model. These differences suggest that advective timescales and thus interbasin merging of upwelling CDW may be overestimated by coarse-resolution models, potentially affecting the skill of centennial scale climate change projections.
  • Article
    Spiraling pathways of global deep waters to the surface of the Southern Ocean
    (Nature Publishing Group, 2017-08-02) Tamsitt, Veronica ; Drake, Henri F. ; Morrison, Adele K. ; Talley, Lynne D. ; Dufour, Carolina O. ; Gray, Alison R. ; Griffies, Stephen M. ; Mazloff, Matthew R. ; Sarmiento, Jorge L. ; Wang, Jinbo ; Weijer, Wilbert
    Upwelling of global deep waters to the sea surface in the Southern Ocean closes the global overturning circulation and is fundamentally important for oceanic uptake of carbon and heat, nutrient resupply for sustaining oceanic biological production, and the melt rate of ice shelves. However, the exact pathways and role of topography in Southern Ocean upwelling remain largely unknown. Here we show detailed upwelling pathways in three dimensions, using hydrographic observations and particle tracking in high-resolution models. The analysis reveals that the northern-sourced deep waters enter the Antarctic Circumpolar Current via southward flow along the boundaries of the three ocean basins, before spiraling southeastward and upward through the Antarctic Circumpolar Current. Upwelling is greatly enhanced at five major topographic features, associated with vigorous mesoscale eddy activity. Deep water reaches the upper ocean predominantly south of the Antarctic Circumpolar Current, with a spatially nonuniform distribution. The timescale for half of the deep water to upwell from 30° S to the mixed layer is ~60–90 years.
  • Working Paper
    Building a Community of Biogeochemistry Float Data Users: an OCB and US CLIVAR Report
    (Woods Hole Oceangraphic Institution, 2023-04-04) Riser, Stephen C. ; Fassbender, Andrea J. ; Johnson, Kenneth S. ; Sarmiento, Jorge L. ; Talley, Lynne D. ; Wijffels, Susan E. ; Hotinski, Roberta ; Gray, Alison R. ; Takeshita, Yuichiro ; Nicholson, David P. ; Purkey, Sarah G. ; Martz, Todd R. ; Matsumoto, George I. ; Cullen, Heidi
    The Global Ocean Biogeochemistry (GO-BGC) array is a 5-year effort funded by the US National Science Foundation to produce and deploy 500 profiling floats equipped with biogeochemical sensors in the world ocean. Deployments began in the first quarter of 2021. To inform and engage a broad oceanographic user community, the Ocean Carbon & Biogeochemistry (OCB) and the US Climate Variability and Predictability (CLIVAR) Programs worked with GO-BGC leadership to host a virtual GO-BGC Scientific Workshop from June 28-30, 2021. The objectives of the workshop were to: • Introduce the GO-BGC plan to the global scientific community • Discuss and innovate on scientific applications of GO-BGC data • Provide background information on the flow of data and archiving • Deliver hands-on tutorials and computer code for accessing GO-BGC data Presentations and discussions were scheduled for 3-4 hours on each day using the Zoom platform. Some pre-recorded presentations were available online prior to each day’s events, so that participants could consider discussion items before the meeting. A Slack channel was also created prior to the meeting so that participants could communicate with organizers, presenters, and other attendees during the event.
  • Article
    Global perspectives on observing ocean boundary current systems
    (Frontiers Media, 2019-08-08) Todd, Robert E. ; Chavez, Francisco P. ; Clayton, Sophie A. ; Cravatte, Sophie ; Goes, Marlos Pereira ; Graco, Michelle ; Lin, Xiaopei ; Sprintall, Janet ; Zilberman, Nathalie ; Archer, Matthew ; Arístegui, Javier ; Balmaseda, Magdalena A. ; Bane, John M. ; Baringer, Molly O. ; Barth, John A. ; Beal, Lisa M. ; Brandt, Peter ; Calil, Paulo H. R. ; Campos, Edmo ; Centurioni, Luca R. ; Chidichimo, Maria Paz ; Cirano, Mauro ; Cronin, Meghan F. ; Curchitser, Enrique N. ; Davis, Russ E. ; Dengler, Marcus ; deYoung, Brad ; Dong, Shenfu ; Escribano, Ruben ; Fassbender, Andrea ; Fawcett, Sarah E. ; Feng, Ming ; Goni, Gustavo J. ; Gray, Alison R. ; Gutiérrez, Dimitri ; Hebert, Dave ; Hummels, Rebecca ; Ito, Shin-ichi ; Krug, Marjolaine ; Lacan, Francois ; Laurindo, Lucas ; Lazar, Alban ; Lee, Craig M. ; Lengaigne, Matthieu ; Levine, Naomi M. ; Middleton, John ; Montes, Ivonne ; Muglia, Michael ; Nagai, Takeyoshi ; Palevsky, Hilary I. ; Palter, Jaime B. ; Phillips, Helen E. ; Piola, Alberto R. ; Plueddemann, Albert J. ; Qiu, Bo ; Rodrigues, Regina ; Roughan, Moninya ; Rudnick, Daniel L. ; Rykaczewski, Ryan R. ; Saraceno, Martin ; Seim, Harvey E. ; Sen Gupta, Alexander ; Shannon, Lynne ; Sloyan, Bernadette M. ; Sutton, Adrienne J. ; Thompson, LuAnne ; van der Plas, Anja K. ; Volkov, Denis L. ; Wilkin, John L. ; Zhang, Dongxiao ; Zhang, Linlin
    Ocean boundary current systems are key components of the climate system, are home to highly productive ecosystems, and have numerous societal impacts. Establishment of a global network of boundary current observing systems is a critical part of ongoing development of the Global Ocean Observing System. The characteristics of boundary current systems are reviewed, focusing on scientific and societal motivations for sustained observing. Techniques currently used to observe boundary current systems are reviewed, followed by a census of the current state of boundary current observing systems globally. The next steps in the development of boundary current observing systems are considered, leading to several specific recommendations.
  • Dataset
    Seaglider 658 profile data from a deployment from April to August 2022 on the Northeast US shelf deployed from the R/V Armstrong cruise AR66-A
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2024-11-05) Gray, Alison R. ; Palter, Jaime B.
    These profile data were collected by a Seaglider (serial number 658), carrying a Seabird CT0344 to measure temperature, salinity, and pressure; Aanderaa 4831IW to measure oxygen; and Wetlabs BBFL2IRB to measure optical properties of seawater (CDOM and chlorophyll fluorescence, and scattering). It profiled 561 times, typically between the surface and 1000 m (or within 10 m of the seafloor, if shallower) on the Northeast US continental shelf. The Seaglider was deployed at 2022-04-09 from 39.847459 °N, 70.731300W and last collected profiling data 2022-08-29 at 40.96°N and 70.87°W. The purpose of the deployment was to collect water column information beneath two Saildrone uncrewed surface vehicles also collecting data in the region. The project was funded by NSF-OCE, with co-PIs Alison Gray (UW), Jaime Palter and Lora Van Uffelen (URI).