Thermal and salinity signals across the San Lorenzo Sill in the Gulf of California. Are gulfies and IPW cascading down slope already in historical data?

HR: 09:30h
AN: OS51D-07 [Abstracts]
TI: Thermal and salinity signals across the San Lorenzo Sill in the Gulf of California. Are gulfies and IPW cascading down slope already in historical data?
AU: * Navarro Olache, L F
EM: lufena@uabc.mx
AF: Universidad Autonoma de Baja california/SOES, Instituto de Investigaciones Oceanologicas Km 108 carr tijuana Ensenada, Ensenada, BC 22860, Mexico
AU: * Navarro Olache, L F
EM: lufena@uabc.mx
AF: School of Earth and Ocean Sciences, European Way, Southampton, Ha S0143zH, United Kingdom
AU: Robinson, I S
EM: isr@noc.coton.ac.uk
AF: School of Earth and Ocean Sciences, European Way, Southampton, Ha S0143zH, United Kingdom
AU: Godinez, V M
EM: mxcali@cicese.mx
AF: Centro de Investigacio Cientifica y Edu. Sup. Ensenada, Departamento de Oceanografia Km 108 Tijuana Ensenada, Ensenada, BC 22860, Mexico
AB: Midscale high salinity structures known as "gulfies" are identified in the central regions of the Gulf of California using all available hydrographic historical data. Cluster of temperature and salinity data are arrayed in a 400 km line from Guaymas basin (26 N,112 W) to the upper limit of Angel de la Guardia Island with the propose of provide evidences of the outflow and inflows in the close proximity to San Lorenzo-San Esteban sill. Based on discrete data analysis three layers of fluid are identified over the sill, two layers in opposite directions and one deep layer of cold inflow (mouth to head), particularly active during winter. The first layer, near surface is a high salinity warm outflow across the sill, from head to mouth, within a depth of 150 m forming eddy like pulses with a form and structure that may be related to "gulfies". The second layer across the sill is in opposite direction (mouth to head). Temperature and salinity data shows that this layer is formed by Subsurface Subtropical Water of Pacific Ocean origin. The third layer cross the sill near bottom (450m), this layer is a cold temperature and low salinity inflow of Pacific Intermediate Water PIW available in the Guaymas Basin apparently with more predominance during winter time. Signal analysis shows that high salinity water outflow progressing over the sill with a velocity of 4 km day-1, apparently with a larger transport during winter. The PIW inflow progress over the sill with a velocity of 0.6 kmday- 1, cascading immediately down the slope one it had crossed the sill. The amount of heat integrated above 500 m reveals that the lowest overall temperature is in the region close to the sill; while the warmer overall temperature is in the west region of the gulf along Ballenas-Salsipuedes channel.
DE: 4512 Currents
DE: 4515 Deep recirculations
DE: 4520 Eddies and mesoscale processes
DE: 4536 Hydrography and tracers
DE: 4553 Overflows
SC: Ocean Sciences [OS]
MN: 2007 Joint Assembly