An irregular occurring series of climatic changes affecting the equatorial pacific region every few years unusually warm nutrient poor water off northern Peru and equator typically in late December?

The phenomenon you're describing is known as El Niño. It involves a periodic warming of sea surface temperatures in the central and eastern Pacific Ocean, which disrupts typical weather patterns. El Niño can lead to significant climatic effects globally, including altered rainfall patterns and increased storm activity. This event typically occurs every few years, peaking around December.