ULSW is the major source of upper NADW. ULSW advects southward from the Labrador Sea in small eddies that mix into the DWBC. A CFC maximum associated with ULSW has been observed along 24°N in the DWBC at 1500 m. Some of the upper ULSW recirculates into the Gulf Stream, while some remains in the DWBC. High CFCs in the subtropics indicate recirculation in the subtropics.
uLSw is The MAJor source oF UpPEr NaDw ulsw AdveCts SouThWArd frOm the laBrador sEA In SmALL edDies thaT mix into tHe dwBC. a cFC maxImum aSsociaTed wIth uLSW has been obServed alOng 24°n in thE DWbc at 1500 m. SoMe OF the upper ulsW reCIrCuLATes inTo thE gUlf sTReAm, whIlE somE rEmainS In tHe dwbC. high cFcs in tHe SubtRopics indicATe ReciRCuLatiON IN the subTRopiCs.