ページの先頭です。
本文へジャンプする。
ここからサイト内共通メニューです。
サイト内共通メニューを読み飛ばす。
サイト内共通メニューここまで。
ここから本文です。

Seen from Space 2007

AMSR-E observes El Niño

  On December 11, 2006, the Japan Meteorological Agency (JMA) announced the possibility that an El Niño phenomenon had occurred last autumn and that this condition would continue until spring.

Fig. 1 Sea-surface temperature distribution (top) and sea-surface temperature anomaly distribution (bottom)observed by AMSR-E.
Enlarged animation (4.9MB)
Figure 1 presents the distribution of sea-surface temperature (Fig. 1 top) and sea-surface temperature anomaly from the last 30-years average (Fig. 1 bottom) observed by AMSR-E on Aqua, a NASA Earth observation satellite. The red area in the upper figure is a high-temperature zone (32.5°C maximum) of the sea surface. The blue area is a low-temperature zone (20°C minimum). The red area in the bottom figure is warmer than the average, and the blue area is colder than the average. An anomalous high sea-surface temperature region is found in the eastern and central tropical Pacific. The box in the image (90°W to 150°W, 5°S to 5°N) is the sea area used by JMA to judge El Niño and La Niña phenomena.

The animation depicts the temporal variation of the weekly mean of sea-surface temperature and its anomaly from January to mid-December, 2006. From January to March, the sea-surface temperature anomalies were negative in the eastern and central tropical Pacific region, corresponding to a La Niña event (ref. "AMSR-E observes La Niña"). The La Niña event ended by June (ref. "La Niña event ends"), and positive sea-surface temperature anomalies have spread since last autumn.

Fig. 2 Time series of sea-surface temperature anomaly in the judgment area
Figure 2 depicts the temporal variation of daily sea-surface temperature anomalies from the 30-year average in the judgment area. A positive anomaly (red area) corresponds to El Niño, and a negative anomaly (blue area) corresponds to La Niña. A positive anomaly appeared in June and has exceeded 1°C since September.

For the latest information on the sea-surface temperature of the tropical Pacific, please visit our webpage "El Niño watch."



Explanation of the images:
(Figs. 1 and 2)
Satellite: Aqua (NASA)
Sensor: Advanced Microwave Scanning Radiometer for EOS-Aqua (AMSR-E; JAXA)
Date: January 1 to December 18, 2006 (Fig. 1)
January to December 2006 (Fig. 2)
See AMSR-E products and algorithm.

Related Sites:
La Niña event ends
AMSR-E observes La Niña
Release of new AMSR-E product "El Niño watch"
2002/03 El Niño Event Observed from Aqua AMSR-E
El Niño and La Niña event (JMA, in Japanese)
本文ここまで。
image:Rocket Navigator
image:Satellite Navigator
image:Satellite Applications and Operations Center(SAOC)
image:ページTOP