Calculate Total Field  for the above location from NOAA website using settings shown above ( result is in the column 5 )

http://www.ngdc.noaa.gov/geomag-web/#igrfwmm

Download Global temperature data from the NOAA's website:

ftp://ftp.ncdc.noaa.gov/pub/data/anomalies/annual.land_ocean.90S.90N.df_1901-2000mean.dat

Re:15 year delay

Geo-dynamic propagation from surface to Earth core and vice-versa appears to be 15 years

The total CAM, (core angular momentum) exhibits a principal maximum at a 15-year lead with respect to LOD (length of day)

http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/13763/1/00-0133.pdf

Kuroshio/Oyashio Currents

.NOAA:
The Kuroshio Current (in red arrow) runs off the coast of Japan. It is a strong and very large warm surface oceanic current  travelling 40 to 121 km/day at 1.6 to 4.8 km/h. At about lat. 35°N it divides to form an eastern branch flowing nearly to the Hawaiian Islands and a northern branch that skirts the coast of Asia and merges with the waters of the cold Oyashio Current to form the North Pacific Current.

The Oyashio Current (in green arrow) is a cold subarctic current that flows south and circulates counter-clockwise along the western North Pacific Ocean.  The two currents collide near eastern shores of Japan forming the North Pacific Current.