2004): Interannual to decadal variability in the southern Okhotsk Sea based on a new gridded upper water temperature data set

• Main Authors: Shoshiro Minobe, Makoto Nakamura
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: variability; quasi-decadal variability; Okhotsk Sea; sea ice changes; air-sea interaction; climate changes Citation; Minobe; S; and; Arctic; Okhotsk; Pacific; Oyashio; okhotsk sea; Sea ice; Subarctic
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.689.1869; http://www.sci.hokudai.ac.jp/grp/poc/top/old/about/papers/Minobe_Nakamura_2004_JGR.pdf?origin%3Dpublication_detail

depths) for the Okhotsk Sea was produced using an optimal interpolation technique from 1950 to 1996 using oceanographic observations in the World Ocean Database 1998. Temperature variability at 50, 100 and 200 m depths in the southern Okhotsk Sea (south of 52N) in the warm-season (May–October) was investigated by an Empirical Orthogonal Function (EOF) analysis from 1958 to 1994, for which sufficient data exist for an EOF analysis. The first EOF mode has a monopole structure with the maximal amplitude in the Kuril Basin, and the corresponding Principal Component (PC) exhibits prominent quasi-decadal variability. The first EOF mode is closely related with the wintertime (December–February) sea surface temperature anomalies over the subarctic front or Oyashio front in the North Pacific, and with wintertime Sea level Pressure (SLP) differences between northern Eurasia and the northern North Pacific. This suggests that the temperature changes in the Okhotsk Sea are caused by changes in the strength of the Asian winter monsoon, which are associated with the SLP difference. A quasi-decadal oscillation, similar to that of the PC-1, is observed in the SLP difference since the 1960s, and shared by the Polar/Eurasian (POL) pattern, Arctic Oscillation (AO) and North