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  • 1
    Keywords: Environmental disasters-Europe-History-To 1500. ; Electronic books.
    Description / Table of Contents: Waiting for the End of the World? addresses the archaeological, architectural, historical, and geological evidence for natural disasters in the Middle Ages between the 11th and 16th centuries.
    Type of Medium: Online Resource
    Pages: 1 online resource (459 pages)
    Edition: 1st ed.
    ISBN: 9781000091700
    Series Statement: The Society for Medieval Archaeology Monographs
    DDC: 363.340940902
    Language: English
    Note: Cover -- Title Page -- Copyright Page -- Table of Contents -- List of figures and plates -- Contributors -- Preface -- Chapter 1 Researching natural disasters in the later Middle Ages -- Background -- Medieval disasters and archaeology -- Disasters in the middle ages -- Conclusions -- References -- Part I Tectonic hazards -- Chapter 2 Rituals of resilience: The interpretative archaeology of post-seismic recovery in medieval Europe -- Adaptation and resilience to medieval seismic disasters -- The archaeological evidence for human victims -- The holy host, the corpus christi and the symbology of the survivors -- Wells in the seismic aftermath -- Wall-ties and lilies: integrating technological and divine protection -- Conclusions -- Acknowledgements -- Notes -- References -- Chapter 3 Medieval earthquakes in Italy: Perceptions and reactions -- Contemporary reactions to earthquakes in medieval Italy -- The impact of seismic events -- Conclusions -- Appendix -- Notes -- Abbreviations -- References -- Chapter 4 Seismic adaptation in the Latin churches of Cyprus -- Background -- The survival of churches -- Scholars in the past -- The shaking earth -- Structural responses -- Accretion of structure -- Centralized plan: Alignment of the centres of mass and rigidity -- Supported flanks -- Side chapels -- Flying buttresses -- Support of superstructure -- Two-storey elevations -- Openings for doors and windows -- Conclusion -- Acknowledgements -- References -- Chapter 5 Architectural heritage and ancient earthquakes in Italy: The constraints and potential of archaeoseismological research applied to medieval buildings -- The church of santi vittore e corona -- The architectural evolution of the complex -- Validating the seismic origin of a damage pattern -- Dating seismic events and comparisons with seismic catalogues. , Archaeoseismological research in the Mugello district, florence -- The research -- Archaeoseismological results from the Mugello case studies -- A chrono-typological atlas of seismic protection systems in the Mugello district -- Traces of an unknown earthquake of the mid-13th century -- Archaeoseismological research in architectural contexts -- Conclusion -- Acknowledgements -- Notes -- References -- Chapter 6 Medieval tsunamis in the Mediterranean and Atlantic: Towards an archaeological perspective -- What is a tsunami? -- European tsunamis in brief -- Archaeological and geological signatures -- The 'draw down' -- The 'swash' and sediment sheets -- 'Trimlines' and the 'backwash' -- Megaclasts -- Discussion -- Conclusion -- Acknowledgements -- References -- Chapter 7 Volcanic eruptions and historical landscape on Lanzarote, Canary Islands, Spain -- Background -- History of study -- Historical archaeology and volcanoes -- Sources and methods of investigation on lanzarote -- Archaeological prospection -- Reconstructing the pre-18th century landscape -- Settlements -- Landscapes -- Conclusions -- Abbreviations -- References -- Chapter 8 'The harvest of despair': Catastrophic fear and the understanding of risk in the shadow of Mount Etna, Italy -- The philosophy of emotion -- The philosophy of fear -- The philosophy of risk -- In the shadow of disaster: the interaction of fear and risk -- Notes -- References -- Part II Severe storms and hydrological hazards -- Chapter 9 Mitigating riverine flood risk in medieval England -- Communicating flood risk -- Benign and malignant rivers -- Place-names of significant settlements in the floodplain -- Wet field-names and minor landscape names -- Managing flood -- Conclusion -- Acknowledgements -- Notes -- Manuscript sources -- References. , Chapter 10 Tide and trauma: Tangible and intangible impacts of the storms of 1287 and 1288 -- The storms of 1287 and 1288 -- The aftermath -- Intangible impacts -- Conclusion -- Notes -- References -- Chapter 11 Disaster or everyday risk?: Perceiving, managing and commemorating floods in medieval central Europe -- General considerations -- The 'millennium flood' of 1501 -- Floods on the traun river (Upper Austria), 14th to 16th centuries -- The ice flood of 1573 in krems (Lower Austria) -- Socio-economic and cultural responses to historic floods -- References -- Chapter 12 Recovering from catastrophe: How medieval society in England coped with disasters -- Desertion of villages -- The aftermath of the great famine in worcestershire -- The severn estuary flood of 1483 -- The 'great fire' of shipston of 1478 -- Responses to disaster in general -- Changes in the long term -- Conclusion -- Notes -- References -- Chapter 13 Fear, matter and miracles: Personal protection and coping with disasters through material culture c1200-1600 -- Fear and disasters -- Invocation of saints -- Cultic coins and concealed deposits -- Social control and the body of christ -- Conclusions -- Notes -- References -- Part III Biophysical hazards -- Chapter 14 Digging up the victims of the Black Death: A bioarchaeological perspective on the second plague pandemic -- Identifying plague victims in the archaeological record -- Insights from the anthropological study of skeletal remains of plague victims -- Demographic composition of plague cemeteries -- Plague mortality with respect to pre-existing health -- Burial treatment of plague victims -- Future directions in the bioarchaeology of plague -- Acknowledgements -- Notes -- References -- Chapter 15 Preserving the ordinary: Social resistance during the second pandemic plagues in the Low Countries. , Plague and resistance in the late medieval and early-modern low countries -- Conclusion -- Acknowledgements -- Notes -- References -- Chapter 16 Reconstructing the impact of 14th-century demographic disasters on late medieval rural communities in England -- The impact of 14th-century demographic turbulence on medieval society -- Evidence from deserted and shrunken medieval settlements in england -- Identifying change in non-deserted rural settlements -- New evidence from currently occupied rural settlements in eastern england -- Desertion -- Severe contraction -- Expansion -- Stasis -- Patterns of change within settlements -- Withdrawal from settlement margins -- Abandonment of dispersed 'greens' and 'ends' -- Atomisation -- Withdrawal from recently inhabited zones -- Church-ward gravitation -- Discussion -- Conclusion -- References -- Chapter 17 Recognising catastrophic cattle-mortality events in England and their repercussions -- Animal burials -- The shapwick burial pit -- The 14th-century panzootic -- Podimore: from two-field to three-field system -- Re-stocking options after cattle mortality -- Archaeological evidence for cattle-mortality events -- Flixborough, lincolnshire: possible evidence for the great carolingian panzootic -- Conclusions -- References -- Chapter 18 Medieval archaeology and natural disasters: Looking towards the future -- Framing medieval reactions to natural disasters through the adaptive cycle -- Dimensions to medieval natural disasters -- Past and future: medieval archaeology and disaster studies -- Notes -- References -- Part IV Catalogue -- Chapter 19 Catalogue of medieval disasters -- The volcanic eruptions of AD 536 and 540 -- The 1117 earthquake in northern Italy -- The 1222 Cyprus earthquake -- The 1248 Mont Granier landslide -- The 1257 Samalas eruption -- The 1315-1322 agrarian crisis. , The 1342 'millennium' flood -- The 1345 Gauldalen slide and flood event -- The 1348 Carinthia and Friuli earthquake -- 'Savage attack': Reactions to the Black Death in Winchester in 1348-49 and after -- The 1356 Basel earthquake -- The 1362 'great drowning of men' (grote mandränke) -- The 1382 Straits of Dover earthquake -- The 1421 St Elizabeth's Day flood -- Arson at Sherborne Abbey, Dorset, in 1437 -- The sweating sickness in late 15th-century and 16th-century England -- Excavating the 1522 earthquake and landslide on the island of São Miguel, Azores -- The 1531 Lisbon earthquake and tsunami -- The 1540 pan-European mega-drought -- The rain in Spain: Early 16th-century drought and reactions -- References -- Index.
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  • 2
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    PANGAEA
    In:  Supplement to: Pfeil, Benjamin; Olsen, Are; Bakker, Dorothee C E; Hankin, Steven; Koyuk, Heather; Kozyr, Alexander; Malczyk, Jeremy; Manke, Ansley; Metzl, Nicolas; Sabine, Christopher L; Akl, John; Alin, Simone R; Bellerby, Richard G J; Borges, Alberto Vieira; Boutin, Jacqueline; Brown, Peter J; Cai, Wei-Jun; Chavez, Francisco P; Chen, Arthur; Cosca, Catherine E; Fassbender, Andrea J; Feely, Richard A; González-Dávila, Melchor; Goyet, Catherine; Hardman-Mountford, Nicolas J; Heinze, Christoph; Hood, E Maria; Hoppema, Mario; Hunt, Christopher W; Hydes, David; Ishii, Masao; Johannessen, Truls; Jones, Steve D; Key, Robert M; Körtzinger, Arne; Landschützer, Peter; Lauvset, Siv K; Lefèvre, Nathalie; Lenton, Andrew; Lourantou, Anna; Merlivat, Liliane; Midorikawa, Takashi; Mintrop, Ludger J; Miyazaki, Chihiro; Murata, Akihiko; Nakadate, Akira; Nakano, Yoshiyuki; Nakaoka, Shin-Ichiro; Nojiri, Yukihiro; Omar, Abdirahman M; Padín, Xose Antonio; Park, Geun-Ha; Paterson, Kristina; Pérez, Fiz F; Pierrot, Denis; Poisson, Alain; Ríos, Aida F; Santana-Casiano, Juana Magdalena; Salisbury, Joe; Sarma, Vedula V S S; Schlitzer, Reiner; Schneider, Bernd; Schuster, Ute; Sieger, Rainer; Skjelvan, Ingunn; Steinhoff, Tobias; Suzuki, Toru; Takahashi, Taro; Tedesco, Kathy; Telszewski, Maciej; Thomas, Helmuth; Tilbrook, Bronte; Tjiputra, Jerry; Vandemark, Doug; Veness, Tony; Wanninkhof, Rik; Watson, Andrew J; Weiss, Ray F; Wong, Chi Shing; Yoshikawa-Inoue, Hisayuki (2013): A uniform, quality controlled Surface Ocean CO2 Atlas (SOCAT). Earth System Science Data, 5(1), 125-143, https://doi.org/10.5194/essd-5-125-2013
    Publication Date: 2024-05-02
    Description: A well-documented, publicly available, global data set of surface ocean carbon dioxide (CO2) parameters has been called for by international groups for nearly two decades. The Surface Ocean CO2 Atlas (SOCAT) project was initiated by the international marine carbon science community in 2007 with the aim of providing a comprehensive, publicly available, regularly updated, global data set of marine surface CO2, which had been subject to quality control (QC). Many additional CO2 data, not yet made public via the Carbon Dioxide Information Analysis Center (CDIAC), were retrieved from data originators, public websites and other data centres. All data were put in a uniform format following a strict protocol. Quality control was carried out according to clearly defined criteria. Regional specialists performed the quality control, using state-of-the-art web-based tools, specially developed for accomplishing this global team effort. SOCAT version 1.5 was made public in September 2011 and holds 6.3 million quality controlled surface CO2 data points from the global oceans and coastal seas, spanning four decades (1968-2007). Three types of data products are available: individual cruise files, a merged complete data set and gridded products. With the rapid expansion of marine CO2 data collection and the importance of quantifying net global oceanic CO2 uptake and its changes, sustained data synthesis and data access are priorities.
    Keywords: 0306SFC_PRT; 061ASFC_PRT; 06AQ19860627-track; 06AQ19860928-track; 06AQ19911114-track; 06AQ19911210-track; 06AQ19921005-track; 06AQ19930128-track; 06AQ19930228-track; 06AQ19931019-track; 06AQ19940524-track; 06AQ19951206-track; 06AQ19960320-track; 06AQ19980411-track; 06AQ19990327-track; 06AQ20001004-track; 06AQ20001026-track; 06BE19961010-track; 06CK20060523-track; 06CK20060715-track; 06CK20060821-track; 06GA19960613-track; 06GA276_3; 06LB19831130-track; 06LB19840107-track; 06LB19840629-track; 06LB19850110-track; 06LB19850313-track; 06LB19850812-track; 06LB19860116-track; 06LB19860323-track; 06LB19860801-track; 06LB19861011-track; 06LB19861214-track; 06LB19870221-track; 06LB19870501-track; 06LB19870721-track; 06LB19870920-track; 06LB19871126-track; 06LB19871231-track; 06LB19880204-track; 06MT18_1; 06MT19910903-track; 06MT19920510-track; 06MT19921229-track; 06MT19941012-track; 06MT19941119-track; 06MT19950714-track; 06MT19960607-track; 06MT19960622-track; 06MT19970106-track; 06MT19970516-track; 06MT19970707-track; 06MT19970814-track; 06MT19981228-track; 06MT20021015-track; 06MT20060714; 06MT20060714-track; 06MT22_5; 06MT30_2; 06MT30_3; 06MT37_2; 06MT39_4; 06MT39_5; 06P119910616-track; 06P119950901-track; 06PO20050321; 06PO20050322-track; 07AL19951011-track; 07AL19960218-track; 07AL19970503-track; 07AL19990718-track; 07AL19991101-track; 07AL19991129-track; 07AL20000113-track; 07AL20000210-track; 07AL20000305-track; 07AL20010513-track; 07AL20010607-track; 07AL20010709-track; 07AL20010802-track; 09AR0103; 09AR19910926-track; 09AR19921019-track; 09AR19930105-track; 09AR19930311-track; 09AR19930807-track; 09AR19931119-track; 09AR19940101-track; 09AR19940831-track; 09AR19941213-track; 09AR19950717-track; 09AR19950916-track; 09AR19960119-track; 09AR19960822-track; 09AR19970910-track; 09AR19971114-track; 09AR19980228-track; 09AR19980404-track; 09AR19980715-track; 09AR19990716-track; 09AR20011031-track; 09AR9401; 09AR9404; 09AR9407; 09AR9501; 09AR9502; 09AR9601; 09AR9604; 09AR9701; 09AR9703; 09AR9707; 09AR9801; 09AR9806; 09AR9901; 09FA20000927-track; 09SS19951116-track; 09SS19990205-track; 11BE19940413-track; 11BE19950303-track; 11BE19950912-track; 11BE19970513-track; 11BE19970527-track; 11BE19970609-track; 11BE19970618-track; 11BE19970621; 11BE19970621-track; 11BE19970702-track; 11BE19980107-track; 11BE19980614-track; 11BE19980625-track; 11BE19980710-track; 11BE19990830-track; 11BE19990904-track; 11BE19990914-track; 11BE19990918-track; 11BE20010502-track; 11BE20010514-track; 11BE20010522-track; 11BE20020422-track; 11BE20020511-track; 11BE20020528-track; 11BE20021104-track; 11BE20030331-track; 11BE20030901; 11BE20030901-track; 11BE20031027; 11BE20031027-track; 11BE20031208; 11BE20031208-track; 11BE20040223; 11BE20040223-track; 11BE20040329; 11BE20040329-track; 11BE20040524; 11BE20040524-track; 11BE20040601-track; 11BE20041004; 11BE20041004-track; 11BE20060425; 11BE20060425-track; 11BE20060529-track; 11BE20070507-track; 18QA19730812-track; 18QA19731028-track; 18QA19760111-track; 18QA19760619-track; 18QA19760911-track; 18QA19761204-track; 18VC19740105-track; 18VC19740216-track; 18VC19741113-track; 18VC19750622-track; 18VC19750913-track; 1995-10-BS; 1996-02-BS; 1997-05-BS; 1999-07-BS; 1999-11-BS; 1999-12-BS; 2000-01-BS; 2000-02-BS; 2000-03-BS; 2001-05-BS; 2001-06-BS; 2001-07-BS; 2001-08-BS; 2003-06-BS; 2003-07-BS; 2003-08-BS; 2003-09-BS; 2003-10-BS; 2004-02-BS; 2004-03-BS; 2004-04-BS; 2004-05-BS; 2004-06-BS; 2004-07-BS; 2004-08-BS; 2004-09-BS; 2004-10-BS; 2005-01-BS; 2005-02-BS; 2005-03-BS; 2005-04-BS; 2005-05-BS; 2005-06-BS; 2005-07-BS; 2005-08-BS; 2005-09-BS; 2005-10-BS; 2005-11-BS; 2005-12-BS; 2006-03-BS; 2006-04-BS; 2006-05-BS; 2006-06-BS; 2006-07-BS; 2006-08-BS; 2006-09-BS; 20070110_TC2; 20070117_TC2; 20070123_TC2; 20070130_TC2; 20070207_TC2; 20070219_TC2; 20070227_TC2; 20070305_TC2; 20070320_TC2; 20070327_TC2; 20070402_TC2; 20070409_TC2; 20070416_TC2; 20070423_TC2; 20070430_TC2; 20070508_TC2; 20070515_TC2; 20070521_TC2; 20070529_TC2; 20070604_TC2; 20070613_TC2; 20070620_TC2; 20070627_TC2; 20070703_TC2; 20070709_TC2; 20070716_TC2; 20070723_TC2; 20070730_TC2; 2007-07-BS; 20070806_TC2; 20070815_TC2; 20070820_TC2; 20070827_TC2; 2007-08-BS; 20070903_TC2; 20070910_TC2; 20070917_TC2; 20071001_TC2; 20071008_TC2; 20071010_TC2; 20071015_TC2; 20071023_TC2; 20071105_TC2; 20071115_TC2; 20071120_TC2; 20071128_TC2; 20071204_TC2; 20071211_TC2; 20071218_TC2; 20071225_TC2; 24N98L1; 24N98L2; 26GC20010421-track; 26GC20010831-track; 26NA20050107; 26NA20050107-track; 26NA20050115; 26NA20050115-track; 26NA20050130; 26NA20050130-track; 26NA20050207; 26NA20050207-track; 26NA20050317; 26NA20050317-track; 26NA20050321; 26NA20050321-track; 26NA20050402; 26NA20050402-track; 26NA20050420; 26NA20050420-track; 26NA20050502; 26NA20050502-track; 26NA20050511; 26NA20050511-track; 26NA20050523; 26NA20050523-track; 26NA20050531; 26NA20050531-track; 26NA20050614; 26NA20050614-track; 26NA20050624; 26NA20050624-track; 26NA20050714; 26NA20050714-track; 26NA20050720; 26NA20050720-track; 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26NA20061214-track; 26NA20061225; 26NA20061225-track; 26NA20070103; 26NA20070103-track; 26NA20070112; 26NA20070112-track; 26NA20070125; 26NA20070125-track; 26NA20070205; 26NA20070205-track; 26NA20070216; 26NA20070216-track; 26NA20070323; 26NA20070323-track; 26NA20070329; 26NA20070329-track; 26NA20070410; 26NA20070410-track; 26NA20070418; 26NA20070418-track; 26NA20070427; 26NA20070427-track; 26NA20070509; 26NA20070509-track; 26NA20070518; 26NA20070518-track; 26NA20070530; 26NA20070530-track; 26NA20070610; 26NA20070610-track; 26NA20070622; 26NA20070622-track; 26NA20070701; 26NA20070701-track; 26NA20070712; 26NA20070712-track; 26NA20070721; 26NA20070721-track; 26NA20070802; 26NA20070802-track; 26NA20070811; 26NA20070811-track; 26NA20070901; 26NA20070901-track; 26NA20070912; 26NA20070912-track; 26NA20070923; 26NA20070923-track; 26NA20071003; 26NA20071003-track; 26NA20071014; 26NA20071014-track; 26NA20071024; 26NA20071024-track; 26NA20071103; 26NA20071103-track; 26NA20071114; 26NA20071114-track; 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    Type: Dataset
    Format: application/zip, 1851 datasets
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  • 3
    Publication Date: 2021-01-04
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 4
    Publication Date: 2021-08-10
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , notRev
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  • 5
    Publication Date: 2021-07-01
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 6
    Publication Date: 2015-04-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
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  • 7
    Publication Date: 2019-09-10
    Description: Global climate is critically sensitive to physical and biogeochemical dynamics in the subpolar Southern Ocean, since itnis here that deep, carbon-rich layers of the world ocean outcrop and exchange carbon with the atmosphere. Here, we present evidence that the conventional framework for the subpolar Southern Ocean carbon cycle, which attributes a dominant role to the vertical overturning circulation and shelf-sea processes, fundamentally misrepresents the drivers of regional carbon uptake. Observations in the Weddell Gyre —a key representative region of the subpolar Southern Ocean— show that the rate of carbon uptake is set by an interplay between the Gyre’s horizontal circulation and the remineralization at mid-depths of organic carbon sourced from biological production in the central gyre. These results demonstrate that reframing the carbon cycle of the subpolar Southern Ocean is an essential step to better define its role in past and future climate change.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 8
    Publication Date: 2021-12-21
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
    Format: application/pdf
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  • 9
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    Unknown
    Earth System Science Data
    In:  EPIC3GLODAPv2.2022: the latest version of the global interior ocean biogeochemical data product, Earth System Science Data Discuss. [preprint], Earth System Science Data, ISSN: 1866-3508
    Publication Date: 2022-09-28
    Description: The Global Ocean Data Analysis Project (GLODAP) is a synthesis effort providing regular compilations of surface-to-bottom ocean biogeochemical bottle data, with an emphasis on seawater inorganic carbon chemistry and related variables determined through chemical analysis of seawater samples. GLODAPv2.2022 is an update of the previous version, GLODAPv2.2021 (Lauvset et al., 2021). The major changes are as follows: data from 96 new cruises were added, data coverage was extended until 2021, and for the first time we performed secondary quality control on all sulphur hexafluoride (SF6) data. In addition, a number of changes were made to data included in GLODAPv2.2021. These changes affect specifically the SF6 data, which are now subjected to secondary quality control, and carbon data measured onboard the RV Knorr in the Indian Ocean in 1994–1995 which are now adjusted using CRM measurements made at the time. GLODAPv2.2022 includes measurements from almost 1.4 million water samples from the global oceans collected on 1085 cruises. The data for the now 13 GLODAP core variables (salinity, oxygen, nitrate, silicate, phosphate, dissolved inorganic carbon, total alkalinity, pH, CFC-11, CFC-12, CFC-113, CCl4, and SF6) have undergone extensive quality control with a focus on systematic evaluation of bias. The data are available in two formats: (i) as submitted by the data originator but converted to World Ocean Circulation Experiment (WOCE) exchange format and (ii) as a merged data product with adjustments applied to minimize bias. For the present annual update, adjustments for the 96 new cruises were derived by comparing those data with the data from the 989 quality controlled cruises in the GLODAPv2.2021 data product using crossover analysis. SF6 data from all cruises were evaluated by comparison with CFC-12 data measured on the same cruises. For nutrients and ocean carbon dioxide (CO2) chemistry comparisons to estimates based on empirical algorithms provided additional context for adjustment decisions. The adjustments that we applied are intended to remove potential biases from errors related to measurement, calibration, and data handling practices without removing known or likely time trends or variations in the variables evaluated. The compiled and adjusted data product is believed to be consistent to better than 0.005 in salinity, 1 % in oxygen, 2 % in nitrate, 2 % in silicate, 2 % in phosphate, 4 μmol kg-1 in dissolved inorganic carbon, 4 μmol kg-1 in total alkalinity, 0.01–0.02 in pH (depending on region), and 5 % in the halogenated transient tracers. The other variables included in the compilation, such as isotopic tracers and discrete CO2 fugacity (fCO2), were not subjected to bias comparison or adjustments.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , notRev
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  • 10
    Publication Date: 2022-12-22
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Subhas, A., Marx, L., Reynolds, S., Flohr, A., Mawji, E., Brown, P., & Cael, B. Microbial ecosystem responses to alkalinity enhancement in the North Atlantic Subtropical Gyre. Frontiers in Climate, 4, (2022): 784997, https://doi.org/10.3389./fclim.2022.784997
    Description: In addition to reducing carbon dioxide (CO2) emissions, actively removing CO2 from the atmosphere is widely considered necessary to keep global warming well below 2°C. Ocean Alkalinity Enhancement (OAE) describes a suite of such CO2 removal processes that all involve enhancing the buffering capacity of seawater. In theory, OAE both stores carbon and offsets ocean acidification. In practice, the response of the marine biogeochemical system to OAE must be demonstrably negligible, or at least manageable, before it can be deployed at scale. We tested the OAE response of two natural seawater mixed layer microbial communities in the North Atlantic Subtropical Gyre, one at the Western gyre boundary, and one in the middle of the gyre. We conducted 4-day microcosm incubation experiments at sea, spiked with three increasing amounts of alkaline sodium salts and a 13C-bicarbonate tracer at constant pCO2. We then measured a suite of dissolved and particulate parameters to constrain the chemical and biological response to these additions. Microbial communities demonstrated occasionally measurable, but mostly negligible, responses to alkalinity enhancement. Neither site showed a significant increase in biologically produced CaCO3, even at extreme alkalinity loadings of +2,000 μmol kg−1. At the gyre boundary, alkalinity enhancement did not significantly impact net primary production rates. In contrast, net primary production in the central gyre decreased by ~30% in response to alkalinity enhancement. The central gyre incubations demonstrated a shift toward smaller particle size classes, suggesting that OAE may impact community composition and/or aggregation/disaggregation processes. In terms of chemical effects, we identify equilibration of seawater pCO2, inorganic CaCO3 precipitation, and immediate effects during mixing of alkaline solutions with seawater, as important considerations for developing experimental OAE methodologies, and for practical OAE deployment. These initial results underscore the importance of performing more studies of OAE in diverse marine environments, and the need to investigate the coupling between OAE, inorganic processes, and microbial community composition.
    Description: AS was supported through WHOI internal and Assistant Scientist Startup funding. LM and SR were supported by the University of Portsmouth Ph.D. scheme and the UK NERC National Capability programme CLASS (Climate Linked Atlantic Sector Science) ECR Fellowship. BC, AF, EM, and PB were supported by the UK NERC National Capability programme CLASS, grant number NE/R015953/1.
    Keywords: Climate—change ; Ocean alkalinity enhancement ; Biogeochemistry ; North Atlantic ; Carbon flux
    Repository Name: Woods Hole Open Access Server
    Type: Article
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