MOVAR: Monitoring the Upper Ocean Thermal Variability MOVAR: Monitoring the Upper Ocean Thermal Variability between Rio de Janeiro and Trindade Islandbetween Rio de Janeiro and Trindade Island

• PRIMARY OBJECTIVE

Take advantage of the Brazilian Navy regular supply ships to Trindade Is. to obtain a high-resolution time-series (spatial resolution ~15nm ; ~3 months time resolution) of the upper ocean thermal structure in a sparsely sampled area of the SW Atlantic.

That is accomplished using a high-resolution XBT line and will help to elucidate several aspects of the gyre scale circulation and its variability, help to calibrate models and allow comparisons with other ocean basins.

• OTHER OBJECTIVES

– Conjugate the XBT time-series with the launch of drifting buoys so as to better understand the circulation in this area and further contribute to programs like PNBOIA, ARGO and the Global Drifter Program.

– Compare the large scale variability information from the in-situ observations with quasi-synoptic satellite data (sst, altimeter, color)

• SUPPORT

MOVAR activities are supported by several institutions: FURG, NOAA/AOML, GOOS/Regional, Brazilian Navy, SeCIRM and CNPq.

MOVAR repeat line

GOAL yearly line

AX98

ARGO Profiling Floats density over the world ocean

High latitude oceanography and marine biology grouphttp://goal.ocfis.furg.br

The Regions of InterestThe Regions of Interest

BMC

PatagonianShelf-Break

Antarctic Pen. &NW Weddell Sea

SURFACE DRIFTERS

Mean 5-year SeaWiFS

chlorophyll image (www.Seawifs.Nasa.gov.)

THE ANTARCTIC PENINSULA AND NW WEDDELL SEA STUDIES

Bathymetric mapping (ETOPO5) of the DOVETAIL program study area. The Bathymetric mapping (ETOPO5) of the DOVETAIL program study area. The hydrographic stations selected to compose the box models are shown for the cruises hydrographic stations selected to compose the box models are shown for the cruises

ARXVIII (ARXVIII (●●) and ARXIX () and ARXIX (), respectively.), respectively.

NW WEDDELL SEA STUDIES

CRUISE ARXVIII (2000)CRUISE ARXVIII (2000)

Philip PassagePhilip Passage Powell BasinPowell Basin

Orkney PassageOrkney Passage Bruce PassageBruce Passage Northern WGNorthern WG

CRUISE ARXVIII (2000)CRUISE ARXVIII (2000)

CRUISE ARXVIII (2000)CRUISE ARXVIII (2000)

• During the austral summer of 2000 the Weddell During the austral summer of 2000 the Weddell Sea Deep Water (WSDW) net transports:Sea Deep Water (WSDW) net transports:

•Philip Passage = 0.01 ± 0.01 SvPhilip Passage = 0.01 ± 0.01 Sv•Orkney Passage = 1.15 Orkney Passage = 1.15 0.32 Sv 0.32 Sv•Bruce Passage = 1.03 Bruce Passage = 1.03 0.23 Sv 0.23 Sv

•After extrapolation within bottom triangles these After extrapolation within bottom triangles these transports are:transports are:

• Philip Passage = 0.12 ± 0.03 SvPhilip Passage = 0.12 ± 0.03 Sv• Orkney Passage = 3.46 ± 1.81 SvOrkney Passage = 3.46 ± 1.81 Sv• Bruce Passage = 1.20 ± 2.15 SvBruce Passage = 1.20 ± 2.15 Sv

CRUISE ARXIX(2001)CRUISE ARXIX(2001)

Philip PassagePhilip Passage Powell BasinPowell Basin

CRUISE ARXIX (2001)CRUISE ARXIX (2001)

• During the austral summer of 2000 the Weddell During the austral summer of 2000 the Weddell Sea Deep Water (WSDW) net transports:Sea Deep Water (WSDW) net transports:

•Philip Passage = 0.012 ± 0.001Philip Passage = 0.012 ± 0.001 SvSv

•After extrapolation within bottom triangles these After extrapolation within bottom triangles these transports are:transports are:

• Philip Passage = 0.113 ± 0.002Philip Passage = 0.113 ± 0.002 SvSv

SASSI (Synoptic Antarctic Shelf-Slope Interactions)

IAnZone initiative for IPY