I'm looking at various sites to have an idea about maritime current in the region 43.976S/90.96E (Chinese debris picture: -43° 58' 34.0 90° 57' 37.0 ) to try estimating the approximative position of the aircraft at impact on the sea.
The average current is 0.2m/s in this area and with a South Eastern direction. It gives roughly 0.72 km/h,that is a 17.3 km per 24 hours. The aircraft disappeared in the ocean on the 8th of March, 8 days before the picture, it would make a SE 140km drift.
It can be applied the same drift for the French debris although we only that it is 550 km in the North.
Of course this a pure speculation and we still do not know yet if these debris are from Flight 370.
Unfortunately the weather is not good at this time and searches are halted.
Sources : oceanmotion.org and oceanweather.com
It is interesting also to look at Skyvector and add the "barbs" to the Weather layer.