000			03145nam a2200337 i 4500
001			500000553
003			UVAL
005			20240528125815.0
007			ta
008			150326s1978 oru g 000 0 spa d
040			_aDIBRA _bspa _cUVAL _erda
041	0		_aeng
084			_aT
100	1		_aSilva Sandoval, Nelson, _d1945-2020 _948472 _eauthor.
245	0	0	_aWater mass structure and circulation off southern Chile / _cNelson Silva Sandoval.
264		1	_aCorvallis, Oregon : _bOregon State University, _c1978.
300			_a83 hojas : _b: figuras.
502			_aMaster of Science in Oceanography.
504			_aBibliografía: hojas 80-83.
520			_aA detailed analysis of the water mass structure and geostrophic circulation off Southern Chile (43° - 63° S, 91° W to the Chilean Coast; (hereafter called study area) was performed . lt was found that: 1. Potential temperature- salinity relations indicate four distinct structure types north of the Polar Front Zone in the study area , involving seven identifiable water masses. These water masses are: Subantarctic Water (SAAW), Antarctic Water (AAW), Equatorial Subsurface Water (ESSW) , Western Pacific Subs urface Wate r (WPSSW) (a new regional water mass identified in this study), Antarctic lntermediate Water (AAIW) , Pacific Deep Water (PDW), and Antarctic Bottom Water (AABW) . 2 . A scattergram of dissolved oxygen - salinity maximum pairs identifies two distinct subsurface salinity maxima . The subsurface sa linity maximum associated with dissolved oxygen mínimum , establishes the presence of the ESSW as a wedge that penetrates to at least 40° S. The other subsurface salinity maximum which is non-associated with dissolved oxygen minimum, is traced from at least 162° W to as close to the Chilean Coast as 80° W at 43° S. In this study, this water mass is called the Western Pacific Subsurface Water (WPSSW). 3. Acceleratlon potential on the 26.84 sigma-ϴ surface relative to 3000 db, combined with the analysis of ϴ-S structures distrlbution and vertical sections of geostrophic velocity relative to 3000 db, show that the Peru-Chile Undercurrent extends as far south as 48° S. 4. Slgnif icant linear correlation between surface phosphate or nitrate vs. salinity for the study area where the salinity ranges between 33 – 34 ‰, show that the relatively low nutrient content of the coastal waters (<300 km) ·mainly results from mixing oceanic waters with waters of the Archipelago system of Southern Chile. Two point mixing explains only 60- 70% of the nutrient variability; thus, biological and/or chemical processes may also be important causes of the re1atively low nutrient oncentrations of the coastal waters.
650		0	_aCIRCULACION OCEANICA _zPACIFICO SUR _9176804.
650		4	_aMASAS DE AGUA _933330.
650		4	_aOCEANOGRAFIA _94855.
700	1		_aNeshyba, Steve, _eProfesor guía _9176803.
700	1		_aGordon, Louis I., _eProfesor informante _9176802.
710	2		_aOregon State University _999683.
942			_c5 _2ddc
999			_c90775 _d90775