I'm interested in understanding El Nino and how it's monitored. First, from the 'El Nino & La Nina' tutorial, what drives eastward propagating Kelvin waves, and what two surface phenomena can indicate a Kelvin wave's presence? Second, navigate to the 'Buoys' section and find the buoy located at '15S 90W'. Provide its full name and the country closest to its location.
Navigate to 'stormsurf.com'. Click on the 'Tutorials' link. Click on the 'El Nino & La Nina' link. Read the content to identify what drives eastward propagating Kelvin waves. Identify the two surface phenomena that can indicate a Kelvin wave's presence. Navigate to the 'Buoys' section (from the main navigation bar). Locate the buoy at '15S 90W' in the list or map. Extract the full name of this buoy. Determine the country closest to its location based on the provided map or geographical context. Synthesize all collected information to answer the task.
The agent states that eastward propagating Kelvin waves are driven by the Madden-Julian Oscillation (MJO). The agent states that a Kelvin wave can be evidenced at the surface by 'a slight rise in sea surface height (8 cm)' and 'slight temperature increase'. The agent successfully navigates to the 'Buoys' section. The agent identifies the buoy at '15S 90W' as '41401 - 15S 90W'. The agent correctly identifies the country closest to '15S 90W' as Peru.