MASOX - Monitoring Arctic Seafloor - Ocean Exchange

Objectives

The Arctic ESONET / EMSO site is where methane hydrate is actively dissociating. Monitoring this methane dissociation is imperative because release of methane from gas hydrate has been proposed as a key causative process for climate change and catastrophic continental margin collapse. Recent multidisciplinary research on the western Svalbard continental shelf and slope (between 78° and 80° N in the western Fram Strait) has discovered more than 250 plumes of free methane gas bubbles venting from the seabed, immediately landward of the edge of the gas hydrate stability zone (which presently lies at ~396 m water depth)(Westbrook et al., submitted). The central science objective of MASOX is to determine whether there is a causative effect of warming shallow Arctic seas conducting heat into the seafloor and subseafloor sediments that will further perturb the thermodynamic stability zone of methane hydrate, increasing the release of free and dissolved methane gas (and CO2 via redox reactions) into the ocean and atmosphere, with consequences for benthic ecology and biogeochemical cycles.

MASOX comprises research groups from AWI, IFMGEOMAR, NOC, IMR-Bergen, and University of Tromsø, bringing an integrated multi-disciplinary approach to record the physical heat flux between the ocean and sediment, the sub-seafloor hydrate phase change, and the exchange of gas and fluids between the sediment and the ocean, and associated chemical reactions. MASOX will integrate measurements of convective heat-flow and temperature recorded by CTDs and current meters, sediment heat conduction using sub-seafloor heat-flow probes, seafloor and nearbottom pH, Eh, and dissolved chemical sensors to record biogeochemistry changes, bubble detection sector scanning echo-sounders and upward looking ADCPs to document the bubble plume free-gas flux, seafloor cameras and benthic chambers to record changes in benthic ecology and chemistry, and finally, a surface buoy weather station to transmit data in realtime to shore.

 

Cartoon showing and the position of the gas hydrate stability zone (GHSZ) offshore W-Svalbard at the present day. Also shown are pathways for methane release into the water column.

Geophysical experiments will focun on the physical 5s for methane releashe physicsdmiss-offshoo1>"true" rze="0px;0px">rlsg thi anhaviourate stabe-gas flux, tegGs.

MAa buthaa>

Gsn of the >

G-ry," />e phyool psd the ourcm gas hydrate has imperative be of thelititye ofourcms, sedimentshic ts to recor real">

M,sot, t

G- et a (350-400 m),bard>Gsne1>

R" da" roes iOX is to dite te is wNoEic ESONET / rate m

MASOX coge of marize-istry, . I/ ements ofs settof -hydraedgeansrdchntry, a-mavicurrent thexistof fte is whartnanss formit eabinofe-artab-biogoma nams. I/ emvensosn athbsda, iaurem-cumelf anri stdata has lti-ddhs"rticwhartnansr perturb -biect en-sga egd meginsnd intersperability

  • . CFMGlysuot, th–h consequene-imauotion(e.g.or hydCHIMEe-imau)so sear therctic sginsas conducting heat ent+5°Cc con+14°Ccase meer st->

    Gsnthe 6thym A 2100. Igealanddan ctat ->

    Gsn(ay.ee mmd>

    G- et a)Fram Strait) has discovered,in bentha ~+1°Ccand CO2 viaely dissoam Structing

  • (eleludtionait)eginntal she)h(e.g.orPosewaion of Mienand,i1999)chemica there isubo

    G- et a te 350-400 m ., submitted). The central scieal exiweb_ter">nt c_toolbar low mode-inlit c_to-imagow modcontent_embptoonass="emx;0px"> 

    Cfigcapv classring Ar-wscnid>npbed embed-inflow mode-inline type-image size-content_empx;0px"> 

    Cartoon showin/id>n/irexirexid>nnter"> Gn mdias-i,fadapv ve eamplthi s

    g/sps ofe rdchntry, aiddens fogy stabte is wNoE. Similwr2y,gIMRcw phybmnefime immediatur c conadapvahydrate NOCc con-Bergerd biogeond atmosichedgeansma nam,us for they cfpectate enha,crdility o Though mostardchntry, aexists, stabrate mo Gne1>

    ,ttabe subhym Aote stab ausati-ma hour hehet eocausathans.al e ot;fotves

    Ey">

    and;>t;http:ass="collapsed" data-quot;>at%20v classole=sitt=_blwgk(United F stbook://wret-right">t;http:ass="collapsed" data-quot;>at%20v class%20-%20t-no%3A%2F%2Frg/var/storage/ima%2FDemonstration-m%2Fssions/AOEM/MASOX" tab%2Fndex%2FD2" role=sitt=_blwgk(United Twral r://wret-right">t;http:ass="collapsed" data-quot;>t;htty">

    ot;submit&quocollapsed" data-quot;>t;pan> own-menu dropdown-menu-breadcrumb" ariaa> /?url=t-no%3A%2F%2Frg/var/storage/ima%2FDemonstration-m%2Fssions/AOEM/MASOX" tab%2Fndex%2FD2" r& escripv cl=I%20ofateve%20 pe%20 e%20fo con he%20"114%20should%20of%20 Pat%20v classole=sitt=_blwgk//wret-right"> Redditdiv>

  • M/aside>
  • pnt c_i>cpnt c_image eziweb-log/ex/t-yellow-1-b">
    ;fotveadcrusv class="cpnt c_area container" id="header_mobilemen;fotveadcrusviv class="cpnt c_area row" id="header_mobilemen;fotveadcrusv class="cpnt c_menu l_core_breadcrumb col-sr hele dataody_arti4body_bre6ilemen;fotveadd="b

    Ab> Ne resentat/www.esoneiAts" class="ajxi">Asects
  • ap="#h id="dm_eziweb/p/li>ap">Shane>apdiv class=" t_lang "> ="cpcripv>tumeow.sns_tol ts=["866da9a06e678aeb5ad8d99e582ccf5b","06a36c13d811e84bf23b8316295df25e","17adeb8f595939ff2386f72fe42b6bd8","c055db7c6396c9eb1afb7f50669e0759","37aea1a0a81a0d9f5e80cb6ebee59094","614b5e36085a755343906c683db93d0e","b732853483c7baf9158491ef121965d8","8ce778dd7cb41de4096ca54a559bdfb5","4ca7e97e031df28064d3f6ac18c5d561","7c0461742ce77545df29874a123ed2e0","a818738a1bfbe2c33df3d410c9083e6b","17722d3ff378c054661f17d48f59bd99","54003372cf66b03912f82c13b25b229f","fc1bcd26fc797d9b61e64ddcc390dabc","6237b844a444c348650bb9dbe1904b14","b84f4d0e4fb64ce54a997d7df08b3025","d5aeece5fb1f49bc921fdee9e9d26371","e5675df9824eca3b8f6160b5ef4f1b2b","bce1ee1cc7f8ee1128f8d3e4372cdb05","4250e974bd59ac510d4875b360982b76","a7c63b96ae27726235b706d0e50e64f6","c6d77700359c10da2c5baae2a75d4d5e","ed2865e2ccfe48c34e141c92b33dbb94","f23a6a2f1f9b30fea4eeee8efd538253","a04faf3eabf4361a2ebc125eb37c6c0e","cf3cacd4aacccf6354e4b2ad4a6d541b","727b536a86da52f93b516d1af656db10","930a127811e63d19736dfa27c7eb095f","7281689df6d6c5608c0ae5feb6577fca","901049f8248a003b4a24e7168a25faa5","40of9bbb6653e0ac0249f4c84e60aa10","eb9a941b1529df007a986ef44ec6a1e1","74f8edf9cf5f088cbadcd769570d02c7","c1582decbf42a969f7ada918fd0b56c1","126a cd39c95d72f84525c4a9ef8c51c","2a836c591066bf78b07097b6dc3e659d","0a5f01199fd9919a3277679267ae60e7","cbcc5084619fb08d8129670a83169b17","e6ca9aeee2dc5e674613f27cc7ce7a33","b4f6ee901341e8a7dc1a47206572b52a","9cd42747eff6768f43699412d1f2de00","8352e9c8bbe455fca38e22e46dfb0e1b","e329f7742bb395e2aaea377fc21010dc","ca994273c7e6af1dd67e66ba206c3cbb","193ce110off80ff0863cfee624861650","0d6a7890509cd174278ee9f20b4359fe","ca63bdfc11a3c9a87b77b59f2afa29a8","2469fc54641e84decbd41d0713395361"];//scripv>/