GoNorth! Greenland 2010! CAAG

-ODULE s #LIMATE/CEANIN-OTION
3TUDENT0AGE
A
(EATAND3ALT
4EMPERATUANDRESALINITYARETHETWOMAININFLUENCESONTHEDENSITYOFOCEANWATER!ND DIFFERING
WATERDENSITYINTURN ISWHATCAUSESTHEOCEANSTOCIRCULATEINDEEP
WATERCURRENTS�WHICHAREVITAL
INKEEPINGARELATIVELYEVENTEMPERATUREONEARTHSURFACES
3OHOWDOESITWORKEXACTLY9OUVEALREADYLOOKEDATMAPSINCLASSTHATSHOWTHEOCEANTEMPERATURES
ANDSALINITYANDYOUKNOWTHATWATERISWARMERANDSALTIERATTHEEQUATORANDCOOLERANDLESSSALTY
ATTHEPOLES3INCELOWERTEMPERATURESANDHIGHERSALINITYBOTHINCREASEDENSITY�WHATGOINGSON
(OWDODEEPOCEANCURRENTSCHANGEASTHEYMOVEFROMTHEEQUATORTOTHEPOLESANDBACKAGAIN
)NTHISEXPERIMENTYOUWILLOBSERVETHEACTIONOFTEMPERATUREANDSALINITYONWATERINDIVIDUALLYIN
ORDERTODRAWCONCLUSIONSABOUTTHEOCEANCURRENTSS
0ART)4EMPERATURE
-ATERIALS
APPROXIMATELYXX
INCHGLASSDISH
HOTANDCOLDTAPWATER
SMALLWATERPROOF:IPLOCKBAGS
CLOTHESPINSORSMALLCLAMPS
DIFFERENTCOLORSOFFOODCOLORING
EYEDROPPERS
AROCK
ICECUBESORACHEMICALCOLDPACK
0ROCEDURE
&ILLTHEGLASSPANWITHTAPWATER,ETTHEPANRESTFORAFEWMINUTESWHILETHEWATERSETTLES
0LACEAROCKINAPLASTICBAGANDFILLTHEBAGWITHHOTWATER3EAL THEBAGANDUSETHECLOTHESPIN
TOCLIPITTOONECORNEROFTHEGLASSPAN
&ILLANOTHERBAGWITHICECUBESORTHECHEMICALCOLDPACKANDCLIPTHISBAGTOTHEOPPOSITECORNER
OFTHEPAN
5SEONEOFTHEDROPPERSTOADDFOURDROPSOFFOODCOLORINGTOTHEWATERNEXTTOTHEICEBAG5SE
THEOTHERDROPPERTOADDFOURDROPSOFADIFFERENTCOLOROFFOODCOLORINGNEXTTOTHEBAGOFHOT
WATER/BSERVE THEFOODCOLORINGFORSEVERALMINUTES7HEREDIDTHEWATERSINK)NWHATDIRECTION
DIDTHECURRENTFLOWALONGTHEBOTTOM7HEREDIDTHEWATERRISE-AKEADRAWINGOFWHATYOU
OBSERVED
5SINGWHATYOUKNOWABOUTTEMPERATUREANDWATERDENSITYWRITE ANEXPLANATIONOFWHATHAPPENED
BELOW(OW DOESWHATHAPPENEDINYOURPANRELATETOTHEMAPOFGLOBALTEMPERATURESYOU
OBSERVEDINCLASS
4SPEV,YWO]GSQ
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