Question

how does ocean current velocity relate to the formation of the antarcticr circumpolar current

lon = -65 #longitude

lat = -60 #latitude

lon1= 60

lat1= -50

lon2= 150

lat2= -60

013616 0.13615 0.13614 0.13613 Time (millon years) 0.142406 0142404 0.142402 צ0142400 0.142398 0.142396 0142394 0.142392 Time (millon years) 0.16 0.14 0.12 0.10 0.08 0.06 0.04 0.02 0.00 Time (millon years)

Answer 1

West Longitude World Longitudes and Latitudes (cylindrical projection) East Longitude 1 180 170 160 150 140 130 120 110 100 90° 80 70 60 50 40 30 20 10" 0 10 20 30 40 50 60" 70° 80 90 100 110 120130 140 150 160 170 180° 80°N 60°N 30oN 20°N - 10 :20 lat 50 tor -1-ong 60 Y lat: -60 long:-150.i ト-| 60

This map shows the location of the places corresponding to which the graphs are drawn

long = -65 lat = -60, we can see that the graph corresponding to this location shows a sharp fall in the ocean current velocity during about 25 million years then again rises forming a V shape till about 35million years and then with some fluctuation remains high almost with a drastic fall towards 0 that is present time.

long = 60 lat = -50, we can see that the graph corresponding to this location shows a constant high ocean current velocity before about 5-10 million years.

long = 150 lat = -60, we can see that the graph corresponding to this location shows a drastic fall in ocean current velocity around 30 million years ago then a constancy.

The fluctuations in the graphs in around 30-35 million years ago in the western and eastern extremities indicates a change and that change is the time around the formation of the Antarctic circumpolar current in the Eocene-Oligocene boundary around 33.9 million years ago.