Abstract
Japanese El Niño Experiment 1987 (JENEX-87) was conducted in the central equatorial Pacific in February 1987 with the participation of the ship Natsushima, on which the author made meteorological observations. In this paper, the outline of them is reported, and two remarkable synoptic disturbances observed are discussed.
One of the two was a near equatorial (∼10°S) tropical depression with a lower-level strong westerly in the nearer equatorial (0°-5°S) region. The other was an upper-level cyclonic vortex-like disturbance observed around 5°S 180°E. Its southwest-northeast vertical section suggests that this disturbance was associated with upper cold air in a three-dimensional view.
