在１９９８年６月底到７月初测到厄尔尼诺强度有所降低。这是否是当前在整个观测时期表现得极其强烈的厄尔尼诺旋回逐渐结束的标志仍不清楚。但是所有的人都明确，１９９８年如果不是历史最热的，那也是最近１０００年来最热的年份之一。根据研究海洋和大气的美国国家机构公布 El Niño strength was reduced at the end of June to early July 1998. Whether this is the sign that the El Ni 旋 gyration, which is currently being extremely over the entire observation period, has ended is still unclear. But all are well aware that if not the hottest in history in 1998, that is one of the warmest years in the last 1,000 years. According to the U.S. national agencies studying the oceans and the atmosphere