The Slow Coastal-Trapped Waves off Subei Bank in the Yellow Sea and Their Climatic Change in the Past Decades

Coastal-trappedwaves (CTWs) areaclassofsubinertial signalsin theweatherfrequencyband that playa pivotal role in coastal air-sea interaction. However, this important topic seems to be missingintheheateddebateinrecentyearsoncoastalenvironmentalchangeandprotection.In thischapter,abriefbutself-containedintroductionoftheCTWtheoryispresented,inthehopeofprovidingareferenceforinvestigatorsintherelevantfields.Alsopresentedisanumerical scheme for computing the wave properties. As a demonstration, we have conducted a prelim-inarystudyoftheCTWsforasectionacrosstheSubeiBankintheYellowSea.Bytheresults,allthecomputedslowmodes,includingabottom-intensifiedone,seemtobeslowingdownsince two decades ago. They have particularly slowed down in the event when a strong El Niño is followedbyastrongLaNiña,suchasinthe97 – 98and09 – 10ElNiñoevents.