Observational Methods Answer the following questions in a few sentences. a) Why can't a single data set be used to study surface gravity waves and El Niño? (5pts) b) How do Eulerian and Lagranian measurements differ? What are the advantages and challenges of each approach? (5pts) c) You are tasked with designing an observational campaign to study coastal upwelling. (15pts) 1. What are 3 sets of observational methods that would be appropriate for the topic? 2. For each observational method, describe i) the spatial and temporal resolution you expect to be able to measure and ii) the pros and cons of the method. 3. How do the 3 data sets you plan to collect compliment one another?