Introduction to Physical and Chemical Oceanography
Introduction to Physical and Chemical Oceanography ATOC 5051
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This 17 page Class Notes was uploaded by Jon Johns on Thursday October 29, 2015. The Class Notes belongs to ATOC 5051 at University of Colorado at Boulder taught by Weiqing Han in Fall. Since its upload, it has received 15 views. For similar materials see /class/232054/atoc-5051-university-of-colorado-at-boulder in Marine Science at University of Colorado at Boulder.
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Date Created: 10/29/15
ATOC 5051 INTRODUCTION TO PHYSICAL OCEANOGRAPHY class 8 Objectives of today s class 1 Observed ocean circulation continue 2 Thermohaline circulation concept 3 Water masses and TS diagram Indian Ocean E E 4 lt G 51 H The Indian quan MN K i The Indian Ocean v7 1 7quot 6 7 M I L a u 1 my m w W mm mm mg m 5m mm cw am sac k w mh mummmnm k39luuomccum p 139 5w sunmwmmnc m m m AWquot NW N ymma mmprr WW quotmum r mm 195 The Arctic Ocean Mediterranean seas a part of the world ocean which has only limited communication with the major ocean basins Paci c Atlantic Indian and where the circulation is dominated by thermohaline forcing The Mediterranean Sea in N Atlantic The Red Sea and Persian Gulf in N Indian Ocean Evaporation E Precipitation P E39P gt0 O2 EPlt0 h t t m Marine 1i e Mari e 1i Salinity increases DEVOId belOW concentration basin PYCHOCIIHG Dilution bas1n Arctic Ocean Dilution basin River 02 SV 6 3 1 X 10 m 5 Sea ice extent Numbernfyearsfursea M39quot quotquot Mex mum 1A icetoexitFramSIrait u Mge a Mm mmpve m Cum a v sac mug 3 2 Thermohaline circulation concept Winddriven circulation STG SPG etc in the Paci c Atlantic amp Indian Ocean Down to 2000m Arctic Ocean Thermohaline circulation Notez exports of sea ice are strongly affected by Winds Thermohaline circulation Thermohaline circulation is the movement of water when its density is changed by a change of temperature or salinity Examples Changes of salinity Arctic Ocean The Mediterranean Sea Red Sea and Persian Gulf Changes of temperature N Atlantic 3 Water masses Water mass is body of water with a common formation history having its origin in a physical region of the ocean Atlantic water masses 1 Abyssal water masses Formed by thermohaline process Sources simpli ed of abyssal water masses AntArctic Intermediate Water AAIW Antarctic Bottom Water AABW Mediterranean Over ow Water MOW Labrador Sea Water LSW Nordic Sea Over ow Water N SOW CTD data yz 25W Atlantic cmsmmmmszsw EIXREESEEiE AAIW and AABW AAIW core depth SOOlOOOm salinity minimum source sea surface near the tip of South America AABW Ocean bottom in fact they are deep water same as Circumpolar Deep Water in the Paci c amp Indian Ocean Below 4000m Cold low salinity from ACC region MOW LSW and NSOW gt NADW North Atlantic Deep Water lOOOm4000rn These three are northern sources for abyssal water mass AAIW and AABW Southern Sources for Abyssal water mass The NADW is in the middle of AAIW and AABW form NADW S XZ 47N MOW upper NADW LSW middle NADW NSOW GIN 5 a 7 r 2 Tseas Bottom GIN Greenland Iceland Nowegian NADW Atlantic thermohaline circulation process i Waters from S Hemisphere into N Atlatic surface warm water AAIW AABW ii Modi cation and convection in NAtlatic amp adjacent seas iii Out ow in a thick deep layer NADW high salinity gt NADW ows to other oceans affecting global circulation heat transport gt clirnate A very simpli ed figure Global thermohaline circulation 90 nquot 90 E 130 l l l l l l l l l mm 90quotquot mm Gum 3W 3cm 0 n r 7 1mm y 30quots 39 5 znquots y C v W s C4quot f rm 3 l en s H Wm am 1 L2 1 w J 431 ULJEle j Lit was m was l l l l l l l l l l l l 9qu a 9m 15quot Fig 6 Schematic diagram of the global ocean circulation pathwayst the convey er belt after W Broe cker modified by E MaierReimer