Deep sea Res Area I 42: 773-795

Deep sea Res Area I 42: 773-795

Annual cycle and you may variability of the Northern Brazil Current

From the surface level, the Coastal H2o (CW) are characterized by higher temperatures and you may reasonable salinities due to lake inflow, mixing on the offshore Warm H2o (TW), which ultimately shows the highest salinity because of the high evaporation pricing in the investigation area. step three and you can 20°C thirty six.0 ( Tomczak TOMCZAK Yards and you can GODFREY JS. 2003. Regional Oceanography: an intro. 2nd ed., Cover. six, p. 63-82. and you may Godfrey 2003, Stramma and England 1999). On intermediate ocean, the brand new Antarctic Advanced Drinking water (AAIW) was recognized by the fresh salinity lowest regarding T-S drawing, whereas the fresh new North Atlantic Deep water (NADW) has a high salinity and you may demolished oxygen articles signature in the strong sea. Within the NADW, the Antarctic Bottom Water (AABW) can be obtained extremely around the seafloor using its cold and you can thicker waters (Stramma and you can The united kingdomt 1999).

Away from sea flow, the fresh Southern Equatorial Current dominates the spot as the an important newest program that tips the latest Brazilian coast throughout the eastern Atlantic. On the surface, the fresh southern area branch of South Equatorial Most recent (called sSEC) is at the coast anywhere between ten-14°S, bifurcating towards the two opposing moves ( Stramma STRAMMA L, FISCHER J and REPPIN J. 1995. The newest North Brazil Undercurrent. and you may The united kingdomt 1999). The newest southern area part originates regarding the Brazil Current (BC), while the north models an excellent subsurface circulate known as North Brazil Around Most recent (NBUC) (Stramma ainsi que al. 1995). Within everything 5°S, the fresh new main branch of your own SEC steps the Brazilian shore becoming the new North Brazil Newest (NBC), that will convergence NBUC, converting it for the an intensified superficial flow ( Schott SCHOTT F, FISCHER J and STRAMMA L. 1998. Transfers and you may paths of your top-covering stream on the west tropical Atlantic. J Phys Oceanogr twenty eight: 1904-1928. et al. 1998, Stramma and you will England 1999) you to boundaries brand new northern/northeast Brazilian shore (Fig. 1). Because the NBC/NBUC hold warm seas of one’s South Atlantic along side equator, it enjoy a crucial role on transport out-of heat anywhere between the brand new hemispheres within the meridional overturning movement ( Johns JOHNS W, LEE T, BEARDSLEY Remote controlled, CANDELA J, LIMEBURNER R and CASTRO B. 1998. J Phys Oceanogr: 103-128. mais aussi al. 1998).

Over the pycnocline, new South Atlantic Main H2o (SACW) enjoys a distinct linear T-S (Temperature and you will Salinity) dating from the thermocline, characterized by a straight-line between the items T-S 5°C 34

The new processes and that control the fresh new circulation for the Eastern Brazilian Margin is actually (i) the brand new change wind gusts, expose throughout the year, originated from new Southern area Atlantic high pressure mobile. During the cold winter they punches Age-SE north of one’s 20s. So it overlap region migrates with the north in summer, getting together with about 12S; (ii) The Intertropical Convergence Zone (ITCZ), a district away from reasonable-height size convergence and you will extreme rain ( Philander PHILANDER SGH, GU D, LAMBERT Grams, LI T, HALPERN D, LAU NC and PACANOWSKI Remote controlled. 1996. Why the fresh ITCZ is mostly northern of one’s equator. J Clim 9: 2958-2972. mais aussi al. 1996) and you can which change the status seasonally, getting closer to new northeast Brazilian coastline in summer and you may fall 12 months, and you will relocating to the north during the cold winter and you may spring season season ( Schneider SCHNEIDER T, BISCHOFF T and you will Hics of your own intertropical overlap area. Character 513: 45-53. et al. 2014).

If you are both of these currents (BC and you will NBC) circulate southward and you may northward, respectively, a great latitudinal fractionation gradient is anticipated at first glance regarding the different local hydrological activities while they get away from each most other. For this reason, units to higher reconstruct this new paleocirculation within specific town try essential to understand the activities regarding temperature change between hemispheres for example the global environment change on highest temporary balances.