Question

question 4
the phase of enso is determined by measuring ______ in the equatorial pacific ocean.
a sea-level pressure anomalies
b sea surface temperature anomalies
c wind speed anomalies
d fish populations

Explanation:

ENSO (El Niño - Southern Oscillation) is mainly characterized by changes in sea - surface temperature in the equatorial Pacific. El Niño is associated with warmer - than - average sea - surface temperatures in the central and eastern equatorial Pacific, while La Niña is associated with cooler - than - average sea - surface temperatures. Sea - level pressure anomalies (related to the Southern Oscillation part but not the main determinant of the phase in terms of the 'El Niño' or 'La Niña' aspect which is temperature - related), wind speed anomalies (can be a consequence or associated factor but not the primary measurement for determining the ENSO phase), and fish populations (affected by ENSO but not a measurement for determining its phase) are not the key measurements.

Answer:

B. Sea surface temperature anomalies