Flashcards
Part 2 Question 1
Flashcards do conjunto (4)
- 1Explain the basis for the Southern Oscillation index. (SOI).The Southern Oscillation Index (SOI) is a measure of the difference sea-level air pressure between Tahiti (in the central Pacific) and Darwin (Australia). The SOI is generally calculated for each month, using the mean sea-level pressures (MSLP) for the month. In the southern summer (Dec-Feb) the SOI is generally negative during El Nino and positive during La Nina.
- 2Explain the difference between weather and climate.Weather is the atmospheric conditions we experience from one day to the the next, over a very short time frame.
Whereas climate is the average atmospheric conditions over long periods, with a time frame of months to several years. - 3Explain what the SST index from the Nino 3.4 region is.Indices based on sea-surface temperature are obtained by estimating average surface temperature indices are calculated as the departure of the current value from long-term averages (SST anomalies).
Nino 3.4 also has large temperature variation over the cycle, but includes part of the region where changes in sea-surface temperature shift the location of rainfall between the western and central Pacific. - 4Explain what happens to the WWV index during an El Nino event.During the developing phase of the El Nino (La Nina), the subsurface ocean structure is characterized by an unusually deep (shallow) layer of warm water and an increased (decreased) depth of the thermocline across the eastern tropical Pacific. Thus, the slope of the thermocline is reduced (increased) across the basin. Consequently, the WWV usually peaks some 7-9 months before an ENSO event.
Informações
- Descrição
- FlashCards sobre Part 2 Question 1, criado por karen eight em 20-11-2013.
- Criado por
- karen eight
- Visualizações
- 28
- Avaliação
Mais sobre El Niño, La Niña and Monsoons