ENSO Monitoring - Effects on Climate
A series of analyses indicating the influence of ENSO on seasonal climate. Select
desired field from the menu at left.
Aids to interpreting plots:
||The long-term average of a given variable, often a 30-year period.
||The difference between the observed value of a variable and its climatological
||An anomaly of a given variable that has been divided by its standard
deviation over the base period considered.
||An abbreviastion for "Outgoing Longwave Radiation". Anomalies
in OLR can be related to cloud cover and precipitation. Negative
OLR anomalies generally indicate increased cloudiness and likelihood of
precipitation while positive anomalies imply decreased cloudiness.
The relationship between OLR anomalies and precipitation holds most strongly
in tropical regions.
||A 5-day average of a variable, starting from 1-5 Jan, 6-10 Jan, ...,
27-31 Dec. On plots using pentad data, the date for the "middle"
of the pentad is displayed: 3 Jan, 8 Jan, ... , 29 Dec.
||The abbreviation for "hectopascal", a unit of atmospheric pressure.
For comaprison, the atmospheric pressure near the earth's surface is roughly
1000 hPa (its less at higher elevations). The 250 hPa level in the
atmosphere is roughly 10 km above the earth's surface. One hPa equals
one "millibar" or "mb", these pressure units are also displayed on some