What is the SOI at the moment?
Table of Contents
- 1 What is the SOI at the moment?
- 2 What is Soi in climate?
- 3 What is the Nino 3.4 index?
- 4 Is 2021 a El Niño year?
- 5 What is negative Southern Oscillation?
- 6 What is the Southern Oscillation and how is it related to El Nino and La Nina quizlet?
- 7 What is the Oceanic Niño Index?
- 8 What is El Niño vs La Niña?
What is the SOI at the moment?
The SOI is one measure of the large-scale fluctuations in air pressure occurring between the western and eastern tropical Pacific (i.e., the state of the Southern Oscillation) during El Niño and La Niña episodes….Southern Oscillation Index (SOI)
| Date | SOI |
|---|---|
| Oct 2021 | 0.7 |
| Sep 2021 | 0.8 |
| Aug 2021 | 0.6 |
| Jul 2021 | 1.4 |
What is Soi in climate?
The Southern Oscillation Index, or SOI, gives an indication of the development and intensity of El Niño or La Niña events in the Pacific Ocean. The SOI is calculated using the pressure differences between Tahiti and Darwin. Waters in the central and eastern tropical Pacific Ocean become cooler during this time.
What is a soi in science?
measurement of Southern Oscillation may be understood using the Southern Oscillation Index (SOI), which compares the difference in atmospheric pressure over Australia and Indonesia with that of the eastern South Pacific.
What is the Nino 3.4 index?
The Niño 3.4 index typically uses a 5-month running mean, and El Niño or La Niña events are defined when the Niño 3.4 SSTs exceed +/- 0.4C for a period of six months or more. ONI (5N-5S, 170W-120W): The ONI uses the same region as the Niño 3.4 index. This region tends to have less variance than the other Niño regions.
Is 2021 a El Niño year?
After an extended period of ENSO-Neutral conditions during the middle of 2021 (i.e., neither El Niño nor La Niña were occurring), observations of the equatorial Pacific Ocean and atmosphere indicate that La Niña conditions developed during September-October 2021.
Will there be a 2021 El Niño or La Niña?
La Niña conditions have officially developed and are expected to remain in place through the entirety of winter 2021-2022. So what exactly does that mean? La Niña means we’re in the negative phase of the El Niño Southern Oscillation, or ENSO for short.
What is negative Southern Oscillation?
The negative phase of the Southern Oscillation occurs during El Niño episodes, and refers to the situation when abnormally high air pressure covers Indonesia and the western tropical Pacific and abnormally low air pressure covers the eastern tropical Pacific.
Southern Oscillation is the accompanying atmospheric component, coupled with the sea temperature change: -El Niño is accompanied with high, and La Niña with low air surface pressure in the tropical western Pacific. -The two periods last several years each (typically three to four) and their effects vary in intensity.
What does a high SOI mean?
The Southern Oscillation Index (SOI) is a measure of the intensity or strength of the Walker Circulation. Sustained positive SOI values above about +8 indicate a La Niña event while sustained negative values below about –8 indicate an El Niño.
What is the Oceanic Niño Index?
The Oceanic Niño Index (ONI) is NOAA’s primary index for tracking the ocean part of ENSO, the El Niño-Southern Oscillation climate pattern. Index values of +0.5 or higher indicate El Niño. Values of -0.5 or lower indicate La Niña.
What is El Niño vs La Niña?
El Niño refers to the above-average sea-surface temperatures that periodically develop across the east-central equatorial Pacific. It represents the warm phase of the ENSO cycle. La Niña refers to the periodic cooling of sea-surface temperatures across the east-central equatorial Pacific.
Are we in a La Niña or El Nino?