Hisashi Nakamura

TL;DR: In this article, the Pacific decadal oscillation (PDO) is not a single phenomenon, but is instead the result of a combination of different physical processes, including remote tropical forcing and local North Pacific atmosphere-ocean interactions, which operate on different time scales to drive similar PDO-like SST anomaly patterns.

TL;DR: In this paper, the authors used reconstructed sea surface temperature datasets and century-long ocean and atmosphere reanalysis products to find that the post-1900 surface ocean warming rate over the path of these currents is two to three times faster than the global mean surface ocean cooling rate.

TL;DR: In this article, a composite analysis is performed for 32 monthly events of enhanced convection observed to the east of the Philippines, and the composited monthly mean vorticity anomalies associated with the Pacific-Japan (PJ) pattern are elongated zonally with a distinct poleward tilt with height.

TL;DR: In this article, the seasonal variations in baroclinic wave activity and jet stream structure in the Northern Hemisphere are investigated based upon over 20 years of daily data, and the analysis of 31-day running mean fields for individual winters is shown that over both the oceans barocli city wave activity is positively correlated with the strength of the upper tropospheric jet for wind speeds up to ∼45 m s−1.